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1.
Zhong Nan Da Xue Xue Bao Yi Xue Ban ; 49(5): 698-704, 2024 May 28.
Artigo em Inglês, Chinês | MEDLINE | ID: mdl-39174883

RESUMO

OBJECTIVES: Radiotherapy is the primary treatment for nasopharyngeal carcinoma, but it frequently leads to radiotherapy-induced temporal lobe injury (RTLI). Magnetic resonance imaging (MRI) is the main diagnostic method for RTLI after radiotherapy for nasopharyngeal carcinoma, but it is prone to missed diagnoses. This study aims to investigate the causes of missed diagnoses of RTLI in nasopharyngeal carcinoma patients undergoing MRI after radiotherapy. METHODS: Clinical and MRI data from nasopharyngeal carcinoma patients diagnosed and treated with radiotherapy at Xiangya Hospital of Central South University, from January 2010 to April 2021, were collected. Two radiologists reviewed all head and neck MRIs (including nasopharyngeal and brain MRIs) before and after radiotherapy of identify cases of late delayed response-type RTLI for the first time. If the original diagnosis of the initial RTLI in nasopharyngeal carcinoma patients did not report temporal lobe lesions, it was defined as a missed diagnosis. The first diagnosis of RTLI cases was divided into a missed diagnosis group and a non-missed diagnosis group. Clinical and imaging data were compared between the 2 groups, and multivariate logistic regression analysis was used to identify independent risk factors for MRI missed diagnoses of initial RTLI. RESULTS: A total of 187 nasopharyngeal carcinoma with post-radiotherapy RTLI were included. The original diagnostic reports missed 120 cases and accurately diagnosed 67 cases, with an initial RTLI diagnosis accuracy rate of 35.8% and a missed diagnosis rate of 64.2%. There were statistically significant differences between the missed diagnosis group and the non-missed diagnosis group in terms of lesion size, location, presence of contralateral temporal lobe lesions, white matter high signal, cystic degeneration, hemorrhage, fluid attenuated inversion recovery (FLAIR), and examination site (all P<0.05). Multivariate logistic regression analysis showed that lesions ≤25 mm, non-enhancing lesions, lesions without cystic degeneration or hemorrhage, lesions located only in the medial temporal lobe, and MRI examination only of the nasopharynx were independent risk factors for missed MRI diagnosis of initial RTLI (all P<0.05). CONCLUSIONS: The missed diagnosis of initial RTLI on MRI is mainly related to lesion size and location, imaging characteristics, and MRI examination site.


Assuntos
Imageamento por Ressonância Magnética , Carcinoma Nasofaríngeo , Neoplasias Nasofaríngeas , Lobo Temporal , Humanos , Imageamento por Ressonância Magnética/métodos , Carcinoma Nasofaríngeo/radioterapia , Carcinoma Nasofaríngeo/diagnóstico por imagem , Lobo Temporal/diagnóstico por imagem , Lobo Temporal/efeitos da radiação , Neoplasias Nasofaríngeas/radioterapia , Neoplasias Nasofaríngeas/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/diagnóstico por imagem , Diagnóstico Ausente , Fatores de Risco , Masculino , Feminino , Pessoa de Meia-Idade
2.
Cancer Imaging ; 24(1): 95, 2024 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-39026377

RESUMO

BACKGROUND: Radiotherapy is a major therapeutic approach in patients with brain tumors. However, it leads to cognitive impairments. To improve the management of radiation-induced brain sequalae, deformation-based morphometry (DBM) could be relevant. Here, we analyzed the significance of DBM using Jacobian determinants (JD) obtained by non-linear registration of MRI images to detect local vulnerability of healthy cerebral tissue in an animal model of brain irradiation. METHODS: Rats were exposed to fractionated whole-brain irradiation (WBI, 30 Gy). A multiparametric MRI (anatomical, diffusion and vascular) study was conducted longitudinally from 1 month up to 6 months after WBI. From the registration of MRI images, macroscopic changes were analyzed by DBM and microscopic changes at the cellular and vascular levels were evaluated by quantification of cerebral blood volume (CBV) and diffusion metrics including mean diffusivity (MD). Voxel-wise comparisons were performed on the entire brain and in specific brain areas identified by DBM. Immunohistology analyses were undertaken to visualize the vessels and astrocytes. RESULTS: DBM analysis evidenced time-course of local macrostructural changes; some of which were transient and some were long lasting after WBI. DBM revealed two vulnerable brain areas, namely the corpus callosum and the cortex. DBM changes were spatially associated to microstructural alterations as revealed by both diffusion metrics and CBV changes, and confirmed by immunohistology analyses. Finally, matrix correlations demonstrated correlations between JD/MD in the early phase after WBI and JD/CBV in the late phase both in the corpus callosum and the cortex. CONCLUSIONS: Brain irradiation induces local macrostructural changes detected by DBM which could be relevant to identify brain structures prone to radiation-induced tissue changes. The translation of these data in patients could represent an added value in imaging studies on brain radiotoxicity.


Assuntos
Lesões Encefálicas , Animais , Ratos , Masculino , Lesões Encefálicas/etiologia , Lesões Encefálicas/diagnóstico por imagem , Lesões Encefálicas/patologia , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/patologia , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/patologia , Lesões por Radiação/etiologia , Encéfalo/efeitos da radiação , Encéfalo/diagnóstico por imagem , Encéfalo/patologia , Imageamento por Ressonância Magnética/métodos , Lesões Experimentais por Radiação/diagnóstico por imagem , Lesões Experimentais por Radiação/patologia , Lesões Experimentais por Radiação/etiologia , Imageamento por Ressonância Magnética Multiparamétrica/métodos
3.
BMC Cancer ; 24(1): 918, 2024 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-39080602

RESUMO

PURPOSE: The purpose of this multicenter retrospective study was to analyze the clinical and radiological effects of bevacizumab (BV) on radionecrosis (RN) that developed after stereotactic radiotherapy (SRT) for brain metastasis. METHODS: Forty patients with SRT related symptomatic brain RN treated in 10 radiation oncology centers were analyzed. The clinical response to BV treatment was categorized as follows: complete (no additional treatment required), partial (requiring either steroids or repeat BV), and unresponsive (requiring surgery). The radiological features of brain RN were analyzed in 10 patients whose serial MRI scans were available after corticosteroid and BV treatments. RESULTS: BV was used as a first line treatment in 11 (27.5%) and as a second line treatment in 29 (72.5%) of patients. The neurological symptoms regressed in 77.5% of patients after treatment with BV (45% complete response, 32.5% partial response). The median edema volume increased from 75.9 cc (range: 5.9-125.8 cc) at RN to 113.65 cc (range: 1.5-382.1 cc) after use of corticosteroids, representing a rate of 39.8% increase (p = 0.074). However, after BV treatment the median volume of edema decreased to 19.5 cc (range: 0-163.3 cc) which represents a difference of 62.2% (p = 0.041) from RN. CONCLUSION: The use of BV caused clinical response rate of 77.5% and a good radiological response in corticosteroid unresponsive patients. The role of BV should be further investigated in prospective studies.


Assuntos
Bevacizumab , Neoplasias Encefálicas , Necrose , Lesões por Radiação , Radiocirurgia , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Inibidores da Angiogênese/uso terapêutico , Bevacizumab/uso terapêutico , Encéfalo/diagnóstico por imagem , Encéfalo/efeitos dos fármacos , Encéfalo/efeitos da radiação , Neoplasias Encefálicas/radioterapia , Imageamento por Ressonância Magnética , Necrose/etiologia , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/tratamento farmacológico , Lesões por Radiação/etiologia , Radiocirurgia/efeitos adversos , Radiocirurgia/métodos , Estudos Retrospectivos , Resultado do Tratamento
4.
BMC Cardiovasc Disord ; 24(1): 328, 2024 Jun 27.
Artigo em Inglês | MEDLINE | ID: mdl-38937716

RESUMO

BACKGROUND: The cardiac toxicity of radiotherapy (RT) can affect cancer survival rates over the long term. This has been confirmed in patients with breast cancer and lymphoma. However, there are few studies utilizing the two-dimensional speckle-tracking echocardiography (2D-STE) to evaluate the risk factors affecting radiation induced heart disease (RIHD), and there is a lack of quantitative data. Therefore, we intend to explore the risk factors for RIHD and quantify them using 2D-STE technology. METHODS: We ultimately enrolled 40 patients who received RT for thoracic tumors. For each patient, 2D-STE was completed before, during, and after RT and in the follow up. We analyzed the sensitivity of 2D-STE in predicting RIHD and the relationship between RT parameters and cardiac systolic function decline. RESULTS: Left ventricle global longitudinal strain (LVGLS), LVGLS of the endocardium (LVGLS-Endo), LVGLS of the epicardium (LVGLS-Epi), and right ventricle free-wall longitudinal strain (RVFWLS) decreased mid- and post-treatment compared with pre-treatment, whereas traditional parameters such as left ventricular ejection fraction (LVEF), cardiac Tei index (Tei), and peak systolic velocity of the free wall of the tricuspid annulus (s') did not show any changes. The decreases in the LVGLS and LVGLS-Endo values between post- and pre-treatment and the ratios of the decreases to the baseline values were linearly correlated with mean heart dose (MHD) (all P values < 0.05). The decreases in the LVGLS-Epi values between post- and pre-treatment and the ratios of the decreases to the baseline values were linearly correlated with the percentage of heart volume exposed to 5 Gy or more (V5) (P values < 0.05). The decrease in RVFWLS and the ratio of the decrease to the baseline value were linearly related to MHD and patient age (all P values < 0.05). Endpoint events occurred more frequently in the right side of the heart than in the left side. Patients over 56.5 years of age had a greater probability of developing right-heart endpoint events. The same was true for patients with MHD over 20.2 Gy in both the left and right sides of the heart. CONCLUSIONS: 2D-STE could detect damages to the heart earlier and more sensitively than conventional echocardiography. MHD is an important prognostic parameter for LV systolic function, and V5 may also be an important prognostic parameter. MHD and age are important prognostic parameters for right ventricle systolic function.


Assuntos
Valor Preditivo dos Testes , Lesões por Radiação , Sístole , Função Ventricular Esquerda , Humanos , Feminino , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Idoso , Função Ventricular Esquerda/efeitos da radiação , Lesões por Radiação/etiologia , Lesões por Radiação/fisiopatologia , Lesões por Radiação/diagnóstico por imagem , Medição de Risco , Cardiotoxicidade , Fatores de Risco , Adulto , Fatores de Tempo , Neoplasias Torácicas/radioterapia , Neoplasias Torácicas/diagnóstico por imagem , Radioterapia/efeitos adversos , Função Ventricular Direita , Ecocardiografia , Fatores de Risco de Doenças Cardíacas , Volume Sistólico
5.
Head Neck ; 46(9): 2132-2144, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-38887926

RESUMO

BACKGROUND: To establish and validate a machine learning model using pretreatment multiparametric magnetic resonance imaging-based radiomics data with clinical data to predict radiation-induced temporal lobe injury (RTLI) in patients with nasopharyngeal carcinoma (NPC) after intensity-modulated radiotherapy (IMRT). METHODS: Data from 230 patients with NPC who received IMRT (130 with RTLI and 130 without) were randomly divided into the training (n = 161) and validation cohort (n = 69) with a ratio of 7:3. Radiomics features were extracted from pretreatment apparent diffusion coefficient (ADC) map, T2-weighted imaging (T2WI), and CE-T1-weighted imaging (CE-T1WI). T-test, spearman rank correlation, and least absolute shrinkage and selection operator (LASSO) algorithm were employed to identify significant radiomics features. Clinical features were selected with univariate and multivariate analyses. Radiomics and clinical models were constructed using multiple machine learning classifiers, and a clinical-radiomics nomogram that combined clinical with radiomics features was developed. Receiver operating characteristic (ROC) curves, calibration curves, and decision curve analysis (DCA) were drawn to compare and verify the predictive performances of the clinical model, radiomics model, and clinical-radiomics nomogram. RESULTS: A total of 5064 radiomics features were extracted, from which 52 radiomics features were selected to construct the radiomics signature. The AUC of the radiomics signature based on multiparametric MRI was 0.980 in the training cohort and 0.969 in the validation cohort, outperforming the radiomics signature only based on T2WI and CE-T1WI (p < 0.05), which highlighted the significance of the DWI sequence in the prediction of temporal lobe injury. The area under the curve (AUC) of the clinical model was 0.895 in the training cohort and 0.905 in the validation cohort. The nomogram, which integrated radiomics and clinical features, demonstrated an impressive AUC value of 0.984 in the validation set; however, no statistically significant difference was observed compared to the radiomics model. The calibration curve and decision curve analysis of the nomogram demonstrated excellent predictive performance and clinical feasibility. CONCLUSIONS: The clinical-radiomics nomogram, integrating clinical features with radiomics features derived from pretreatment multiparametric MRI, exhibits compelling predictive performance for RTLI in patients diagnosed with NPC.


Assuntos
Aprendizado de Máquina , Carcinoma Nasofaríngeo , Neoplasias Nasofaríngeas , Lesões por Radiação , Radiômica , Radioterapia de Intensidade Modulada , Lobo Temporal , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Imageamento por Ressonância Magnética Multiparamétrica , Carcinoma Nasofaríngeo/radioterapia , Carcinoma Nasofaríngeo/diagnóstico por imagem , Neoplasias Nasofaríngeas/radioterapia , Neoplasias Nasofaríngeas/diagnóstico por imagem , Nomogramas , Valor Preditivo dos Testes , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Radioterapia de Intensidade Modulada/efeitos adversos , Estudos Retrospectivos , Curva ROC , Lobo Temporal/diagnóstico por imagem , Lobo Temporal/efeitos da radiação
6.
Jt Dis Relat Surg ; 35(2): 455-461, 2024 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-38727129

RESUMO

Case reports of plexopathy after prostate cancer are usually neoplastic. Radiation-induced lumbosacral plexopathy and insufficiency fractures have clinical significance due to the need to differentiate them from tumoral invasions, metastases, and spinal pathologies. Certain nuances, including clinical presentation and screening methods, help distinguish radiation-induced plexopathy from tumoral plexopathy. This case report highlights the coexistence of these two rare clinical conditions. Herein, we present a 78-year-old male with a history of radiotherapy for prostate cancer who developed right foot drop, severe lower back and right groin pain, difficulty in standing up and walking, and tingling in both legs over the past month during remission. The diagnosis of lumbosacral plexopathy and pelvic insufficiency fracture was made based on magnetic resonance imaging, positron emission tomography, and electroneuromyography. The patient received conservative symptomatic treatment and was discharged with the use of a cane for mobility. Radiation-induced lumbosacral plexopathy following prostate cancer should be kept in mind in patients with neurological disorders of the lower limbs. Pelvic insufficiency fracture should also be considered if the pain does not correspond to the clinical findings of plexopathy. These two pathologies, which can be challenging to diagnose, may require surgical or complex management approaches. However, in this patient, conservative therapies led to an improvement in quality of life and a reduction in the burden of illness.


Assuntos
Fraturas de Estresse , Plexo Lombossacral , Neoplasias da Próstata , Lesões por Radiação , Humanos , Masculino , Neoplasias da Próstata/radioterapia , Idoso , Plexo Lombossacral/lesões , Plexo Lombossacral/efeitos da radiação , Plexo Lombossacral/patologia , Fraturas de Estresse/etiologia , Fraturas de Estresse/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/diagnóstico por imagem , Ossos Pélvicos/lesões , Ossos Pélvicos/patologia , Ossos Pélvicos/diagnóstico por imagem , Ossos Pélvicos/efeitos da radiação , Doenças do Sistema Nervoso Periférico/etiologia , Imageamento por Ressonância Magnética , Radioterapia/efeitos adversos
7.
Radiother Oncol ; 197: 110323, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38734144

RESUMO

BACKGROUND AND PURPOSE: Xerostomia, caused by radiation-induced parotid damage, is the most commonly reported radiotherapy (RT) complication for nasopharyngeal carcinoma (NPC). The purpose of this study was to evaluate the value of intravoxel incoherent motion (IVIM) MR in monitoring radiation-induced parotid gland damage and predicting the risk of xerostomia. METHODS: Fifty-four NPC patients were enrolled and underwent at least three IVIM MR scans: before (pre-RT), after 5 fractions of (5th-RT), halfway through (mid-RT), and after RT (post-RT). The degree of xerostomia patients was assessed before each MR examination. Furthermore, the time when patients first reported xerostomia symptoms was recorded. The changes in IVIM parameters throughout RT, as well as the relationships between IVIM parameters and xerostomia, were analysed. RESULT: All IVIM parameters increased significantly from pre-RT to post-RT (p < 0.001). The rates of D, D* and f increase increased significantly from pre-RT to mid-RT (p < 0.001), indicating that cell necrosis mainly occurs in the first half of RT. In multivariate analysis, N3 (p = 0.014), pre-D (p = 0.007) and pre-D* (p = 0.003) were independent factors influencing xerostomia. D and f were significantly higher at 5th-RT than at pre-RT (both p < 0.05). IVIM detected parotid gland injury at 5th-RT at an average scanning time of 6.18 ± 1.07 days, earlier than the 11.94 ± 2.61 days when the patient first complained of xerostomia according to the RTOG scale (p < 0.001). CONCLUSIONS: IVIM MR can dynamically monitor radiation-induced parotid gland damage and assess it earlier and more objectively than RTOG toxicity. Moreover, IVIM can screen people at risk of more severe xerostomia early.


Assuntos
Carcinoma , Imageamento por Ressonância Magnética , Carcinoma Nasofaríngeo , Neoplasias Nasofaríngeas , Xerostomia , Humanos , Xerostomia/etiologia , Masculino , Feminino , Pessoa de Meia-Idade , Neoplasias Nasofaríngeas/radioterapia , Carcinoma Nasofaríngeo/radioterapia , Carcinoma Nasofaríngeo/complicações , Adulto , Imageamento por Ressonância Magnética/métodos , Idoso , Carcinoma/radioterapia , Lesões por Radiação/etiologia , Lesões por Radiação/diagnóstico por imagem , Glândula Parótida/efeitos da radiação , Glândula Parótida/diagnóstico por imagem , Valor Preditivo dos Testes
8.
Int J Radiat Oncol Biol Phys ; 119(2): 669-680, 2024 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-38760116

RESUMO

The Pediatric Normal Tissue Effects in the Clinic (PENTEC) consortium has made significant contributions to understanding and mitigating the adverse effects of childhood cancer therapy. This review addresses the role of diagnostic imaging in detecting, screening, and comprehending radiation therapy-related late effects in children, drawing insights from individual organ-specific PENTEC reports. We further explore how the development of imaging biomarkers for key organ systems, alongside technical advancements and translational imaging approaches, may enhance the systematic application of imaging evaluations in childhood cancer survivors. Moreover, the review critically examines knowledge gaps and identifies technical and practical limitations of existing imaging modalities in the pediatric population. Addressing these challenges may expand access to, minimize the risk of, and optimize the real-world application of, new imaging techniques. The PENTEC team envisions this document as a roadmap for the future development of imaging strategies in childhood cancer survivors, with the overarching goal of improving long-term health outcomes and quality of life for this vulnerable population.


Assuntos
Lesões por Radiação , Humanos , Criança , Lesões por Radiação/diagnóstico por imagem , Sobreviventes de Câncer , Órgãos em Risco/diagnóstico por imagem , Órgãos em Risco/efeitos da radiação , Neoplasias/radioterapia , Neoplasias/diagnóstico por imagem , Radioterapia/efeitos adversos , Diagnóstico por Imagem/métodos
9.
J Neurooncol ; 168(3): 547-553, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38748050

RESUMO

PURPOSE: The differentiation between adverse radiation effects (ARE) and tumor recurrence or progression (TRP) is a major decision-making point in the follow-up of patients with brain tumors. The advent of immunotherapy, targeted therapy and radiosurgery has made this distinction difficult to achieve in several clinical situations. Contrast clearance analysis (CCA) is a useful technique that can inform clinical decisions but has so far only been histologically validated in the context of high-grade gliomas. METHODS: This is a series of 7 patients, treated between 2018 and 2023, for various brain pathologies including brain metastasis, atypical meningioma, and high-grade glioma. MRI with contrast clearance analysis was used to inform clinical decisions and patients underwent surgical resection as indicated. The histopathology findings were compared with the CCA findings in all cases. RESULTS: All seven patients had been treated with gamma knife radiosurgery and were followed up with periodic MR imaging. All patients underwent CCA when the necessity to distinguish tumor recurrence from radiation necrosis arose, and subsequently underwent surgery as indicated. Concordance of CCA findings with histological findings was found in all cases (100%). CONCLUSIONS: Based on prior studies on GBM and the surgical findings in our series, delayed contrast extravasation MRI findings correlate well with histopathology across a wide spectrum of brain tumor pathologies. CCA can provide a quick diagnosis and have a direct impact on patients' treatment and outcomes.


Assuntos
Neoplasias Encefálicas , Meios de Contraste , Imageamento por Ressonância Magnética , Recidiva Local de Neoplasia , Radiocirurgia , Humanos , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/cirurgia , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/patologia , Imageamento por Ressonância Magnética/métodos , Recidiva Local de Neoplasia/diagnóstico por imagem , Recidiva Local de Neoplasia/patologia , Feminino , Masculino , Pessoa de Meia-Idade , Idoso , Adulto , Seguimentos , Glioma/diagnóstico por imagem , Glioma/cirurgia , Glioma/radioterapia , Glioma/patologia , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/patologia
10.
Medicine (Baltimore) ; 103(18): e37789, 2024 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-38701250

RESUMO

Purpose of our research is to demonstrate efficacy of narrow interval dual phase [18F]-fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) imaging in distinguishing tumor recurrence (TR) from radiation necrosis (RN) in patients treated for brain metastases. 35 consecutive patients (22 female, 13 male) with various cancer subtypes, lesion size > 1.0 cm3, and suspected recurrence on brain magnetic resonance imaging (MRI) underwent narrow interval dual phase FDG-PET/CT (30 and 90 min after tracer injection). Clinical outcome was determined via sequential MRIs or pathology reports. Maximum standard uptake value (SUVmax) of lesion (L), gray matter (GM), and white matter (WM) was measured on early (1) and delayed (2) imaging. Analyzed variables include % change, late phase, and early phase for L uptake, L/GM uptake, and L/WM uptake. Statistical analysis (P < .01), receiver operator characteristic (ROC) curve and area under curve (AUC) cutoff values were obtained. Change in L/GM ratio of > -2% was 95% sensitive, 91% specific, and 93% accurate (P < .001, AUC = 0.99) in distinguishing TR from RN. Change in SUVmax of lesion alone was the second-best indicator (P < .001, AUC = 0.94) with an ROC cutoff > 30.5% yielding 86% sensitivity, 83% specificity, and 84% accuracy. Other variables (L alone or L/GM ratios in early or late phase, all L/WM ratios) were significantly less accurate. Utilizing narrow interval dual phase FDG-PET/CT in patients with brain metastasis treated with radiation therapy provides a practical approach to distinguish TR from RN. Narrow time interval allows for better patient comfort, greater efficiency of PET/CT scanner, and lower disruption of workflow.


Assuntos
Neoplasias Encefálicas , Fluordesoxiglucose F18 , Recidiva Local de Neoplasia , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada , Lesões por Radiação , Compostos Radiofarmacêuticos , Humanos , Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada/métodos , Feminino , Masculino , Neoplasias Encefálicas/secundário , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/radioterapia , Pessoa de Meia-Idade , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/patologia , Recidiva Local de Neoplasia/diagnóstico por imagem , Idoso , Adulto , Diagnóstico Diferencial , Necrose/diagnóstico por imagem , Encéfalo/diagnóstico por imagem , Encéfalo/patologia , Imageamento por Ressonância Magnética/métodos , Curva ROC
11.
Radiother Oncol ; 196: 110285, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38641258

RESUMO

BACKGROUND AND PURPOSE: Radiotherapy (RT) can damage neck vessels in patients with head and neck cancer (HNC). This study investigated the early effects of RT on carotid artery, including the internal media thickness (IMT) and carotid plaques of the common carotid artery (CCA). MATERIALS AND METHODS: This study included 69 patients with HNC who underwent RT at the First Hospital of Jilin University from March 2017 to September 2022, and 69 healthy participants as controls. Color Doppler ultrasound (CDUS) of the carotid artery was used to measure the CCA IMT and plaques. RESULTS: Left CCA IMT increased from 0.60 mm (0.60, 0.70) before RT to 0.70 mm (0.60, 1.20) after RT (P < 0.0001). Right CCA IMT changed from 0.60 mm (0.60, 0.71) before RT to 0.60 mm (0.60, 1.10) after RT (P = 0.0002). CCA IMT was 0.60 mm (0.60, 0.70) and 0.80 mm (0.60, 1.20) in the ≤40 Gy and >40 Gy groups (P = 0.0004). The CCA plaques number increased significantly after RT on both the left and right sides (Pleft < 0.0001; Pright <0.0001). The CCA plaques volume increased from 0 mm3 (0, 11.35) and 0 mm3 (0, 8.55) before RT to 8.8 mm3 (0, 21.5) and 5.8 mm3 (0, 16.1) on the left and right sides. Correlation analysis revealed a correlation between CCA IMT and age (r = 0.283, P = 0.001), smoking status (r = 0.179, P = 0.020), and radiation dose (r = 0.188, P = 0.028). CONCLUSION: RT significantly increased CCA IMT, and the growth was related to the radiation dose. The number and volume of the CCA plaques also increased after RT.


Assuntos
Neoplasias de Cabeça e Pescoço , Lesões por Radiação , Ultrassonografia Doppler em Cores , Humanos , Masculino , Neoplasias de Cabeça e Pescoço/radioterapia , Neoplasias de Cabeça e Pescoço/diagnóstico por imagem , Neoplasias de Cabeça e Pescoço/patologia , Feminino , Pessoa de Meia-Idade , Lesões por Radiação/etiologia , Lesões por Radiação/diagnóstico por imagem , Idoso , Espessura Intima-Media Carotídea , Lesões das Artérias Carótidas/etiologia , Lesões das Artérias Carótidas/diagnóstico por imagem , Adulto , Artéria Carótida Primitiva/diagnóstico por imagem , Artéria Carótida Primitiva/efeitos da radiação , Estudos de Casos e Controles
12.
Radiother Oncol ; 196: 110268, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38641261

RESUMO

BACKGROUND AND PURPOSE: Multiple studies demonstrated hypothalamic-pituitary dysfunction in survivors of pediatric brain tumors. However, few studies investigated the trajectories of pituitary height in these patients and their associations with pituitary function. We aimed to evaluate longitudinal changes of pituitary height in children and adolescents with brain tumors, and their association with endocrine deficiencies. MATERIALS AND METHODS: We conducted a retrospective analysis of 193 pediatric patients (54.9% male) diagnosed with brain tumors from 2002 to 2018, with a minimum of two years of radiological follow-up. Pituitary height was measured using MRI scans at diagnosis and at 2, 5, and 10 years post-diagnosis, with clinical data sourced from patient charts. RESULTS: Average age at diagnosis was 7.6 ± 4.5 years, with a follow-up of 6.1 ± 3.4 years. 52.8% underwent radiotherapy and 37.8% experienced pituitary hormone deficiency. Radiation treatment was a significant predictor of decreased pituitary height at all observed time points (p = 0.016, p < 0.001, p = 0.008, respectively). Additionally, chemotherapy (p = 0.004) or radiotherapy (p = 0.022) history and pituitary height at 10 years (p = 0.047) were predictors of endocrine deficiencies. ANOVA revealed an expected increase in pituitary height over time in pediatric patients, but this growth was significantly impacted by radiation treatment and gender (p for interaction = 0.005 and 0.025, respectively). CONCLUSION: Cranial irradiation in pediatric patients is associated with impairment of the physiologic increase in pituitary size; in turn, decreased pituitary height is associated with endocrine dysfunction. We suggest that pituitary gland should be evaluated on surveillance imaging of pediatric brain tumor survivors, and if small for age, clinical endocrine evaluation should be pursued.


Assuntos
Neoplasias Encefálicas , Humanos , Criança , Masculino , Feminino , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/diagnóstico por imagem , Estudos Retrospectivos , Adolescente , Lesões por Radiação/etiologia , Lesões por Radiação/diagnóstico por imagem , Hipófise/efeitos da radiação , Hipófise/diagnóstico por imagem , Pré-Escolar , Imageamento por Ressonância Magnética , Irradiação Craniana/efeitos adversos , Hipopituitarismo/etiologia
13.
J Neurooncol ; 168(2): 307-316, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38689115

RESUMO

OBJECTIVE: Radiation necrosis (RN) can be difficult to radiographically discern from tumor progression after stereotactic radiosurgery (SRS). The objective of this study was to investigate the utility of radiomics and machine learning (ML) to differentiate RN from recurrence in patients with brain metastases treated with SRS. METHODS: Patients with brain metastases treated with SRS who developed either RN or tumor reccurence were retrospectively identified. Image preprocessing and radiomic feature extraction were performed using ANTsPy and PyRadiomics, yielding 105 features from MRI T1-weighted post-contrast (T1c), T2, and fluid-attenuated inversion recovery (FLAIR) images. Univariate analysis assessed significance of individual features. Multivariable analysis employed various classifiers on features identified as most discriminative through feature selection. ML models were evaluated through cross-validation, selecting the best model based on area under the receiver operating characteristic (ROC) curve (AUC). Specificity, sensitivity, and F1 score were computed. RESULTS: Sixty-six lesions from 55 patients were identified. On univariate analysis, 27 features from the T1c sequence were statistically significant, while no features were significant from the T2 or FLAIR sequences. For clinical variables, only immunotherapy use after SRS was significant. Multivariable analysis of features from the T1c sequence yielded an AUC of 76.2% (standard deviation [SD] ± 12.7%), with specificity and sensitivity of 75.5% (± 13.4%) and 62.3% (± 19.6%) in differentiating radionecrosis from recurrence. CONCLUSIONS: Radiomics with ML may assist the diagnostic ability of distinguishing RN from tumor recurrence after SRS. Further work is needed to validate this in a larger multi-institutional cohort and prospectively evaluate it's utility in patient care.


Assuntos
Neoplasias Encefálicas , Aprendizado de Máquina , Imageamento por Ressonância Magnética , Necrose , Recidiva Local de Neoplasia , Lesões por Radiação , Humanos , Neoplasias Encefálicas/secundário , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/diagnóstico por imagem , Feminino , Masculino , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/patologia , Pessoa de Meia-Idade , Necrose/diagnóstico por imagem , Recidiva Local de Neoplasia/diagnóstico por imagem , Recidiva Local de Neoplasia/patologia , Estudos Retrospectivos , Imageamento por Ressonância Magnética/métodos , Idoso , Radiocirurgia , Adulto , Diagnóstico Diferencial , Idoso de 80 Anos ou mais , Radiômica
14.
Brain Res ; 1833: 148851, 2024 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-38479491

RESUMO

PURPOSE: To investigate white matter microstructural abnormalities caused by radiotherapy in nasopharyngeal carcinoma (NPC) patients using MRI high-angular resolution diffusion imaging (HARDI). METHODS: We included 127 patients with pathologically confirmed NPC: 36 in the pre-radiotherapy group, 29 in the acute response period (post-RT-AP), 23 in the early delayed period (post-RT-ED) group, and 39 in the late-delayed period (post-RT-LD) group. HARDI data were acquired for each patient, and dispersion parameters were calculated to compare the differences in specific fibre bundles among the groups. The Montreal Neurocognitive Assessment (MoCA) was used to evaluate neurocognitive function, and the correlations between dispersion parameters and MoCA were analysed. RESULTS: In the right cingulum frontal parietal bundles, the fractional anisotropy value decreased to the lowest level post-RT-AP and then reversed and increased post-RT-ED and post-RT-LD. The mean, axial, and radial diffusivity were significantly increased in the post-RT-AP (p < 0.05) and decreased in the post-RT-ED and post-RT-LD groups to varying degrees. MoCA scores were decreased post-radiotherapy than those before radiotherapy (p = 0.005). MoCA and mean diffusivity exhibited a mild correlation in the left cingulum frontal parahippocampal bundle. CONCLUSIONS: White matter tract changes detected by HARDI are potential biomarkers for monitoring radiotherapy-related brain damage in NPC patients.


Assuntos
Imagem de Difusão por Ressonância Magnética , Imagem de Tensor de Difusão , Carcinoma Nasofaríngeo , Neoplasias Nasofaríngeas , Substância Branca , Humanos , Masculino , Substância Branca/efeitos da radiação , Substância Branca/diagnóstico por imagem , Substância Branca/patologia , Feminino , Carcinoma Nasofaríngeo/radioterapia , Carcinoma Nasofaríngeo/diagnóstico por imagem , Pessoa de Meia-Idade , Adulto , Neoplasias Nasofaríngeas/radioterapia , Neoplasias Nasofaríngeas/patologia , Imagem de Difusão por Ressonância Magnética/métodos , Imagem de Tensor de Difusão/métodos , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/patologia , Idoso , Anisotropia , Encéfalo/patologia , Encéfalo/efeitos da radiação , Encéfalo/diagnóstico por imagem
15.
Int J Radiat Oncol Biol Phys ; 120(1): 216-228, 2024 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-38452858

RESUMO

PURPOSE: Radiation-induced lung injury has been shown to alter regional ventilation and perfusion in the lung. However, changes in regional pulmonary gas exchange have not previously been measured. METHODS AND MATERIALS: Ten patients receiving conventional radiation therapy (RT) for lung cancer underwent pre-RT and 3-month post-RT magnetic resonance imaging (MRI) using an established hyperpolarized 129Xe gas exchange technique to map lung function. Four patients underwent an additional 8-month post-RT MRI. The MR signal from inhaled xenon was measured in the following 3 pulmonary compartments: the lung airspaces, the alveolar membrane tissue, and the pulmonary capillaries (interacting with red blood cells [RBCs]). Thoracic 1H MRI scans were acquired, and deformable registration was used to transfer 129Xe functional maps to the RT planning computed tomography scan. The RT-associated changes in ventilation, membrane uptake, and RBC transfer were computed as a function of regional lung dose (equivalent dose in 2-Gy fractions). Pearson correlations and t tests were used to determine statistical significance, and weighted sum of squares linear regression subsequently characterized the dose dependence of each functional component. The pulmonary function testing metrics of forced vital capacity and diffusing capacity for carbon monoxide were also acquired at each time point. RESULTS: Compared with pre-RT baseline, 3-month post-RT ventilation decreased by an average of -0.24 ± 0.05%/Gy (ρ = -0.88; P < .001), membrane uptake increased by 0.69 ± 0.14%/Gy (ρ = 0.94; P < .001), and RBC transfer decreased by -0.41 ± 0.06%/Gy (ρ = -0.92; P < .001). Membrane uptake maintained a strong positive correlation with regional dose at 8 months post-RT, demonstrating an increase of 0.73 ± 0.11%/Gy (ρ = 0.92; P = .006). Changes in membrane uptake and RBC transfer appeared greater in magnitude (%/Gy) for individuals with low heterogeneity in their baseline lung function. An increase in whole-lung membrane uptake showed moderate correlation with decreases in forced vital capacity (ρ = -0.50; P = .17) and diffusing capacity for carbon monoxide (ρ = -0.44; P = .23), with neither correlation reaching statistical significance. CONCLUSIONS: Hyperpolarized 129Xe MRI measured and quantified regional, RT-associated, dose-dependent changes in pulmonary gas exchange. This tool could enable future work to improve our understanding and management of radiation-induced lung injury.


Assuntos
Neoplasias Pulmonares , Imageamento por Ressonância Magnética , Isótopos de Xenônio , Humanos , Isótopos de Xenônio/administração & dosagem , Neoplasias Pulmonares/radioterapia , Neoplasias Pulmonares/diagnóstico por imagem , Imageamento por Ressonância Magnética/métodos , Pessoa de Meia-Idade , Masculino , Idoso , Feminino , Pulmão/diagnóstico por imagem , Pulmão/efeitos da radiação , Troca Gasosa Pulmonar , Lesão Pulmonar/diagnóstico por imagem , Lesão Pulmonar/etiologia , Eritrócitos/efeitos da radiação , Lesões por Radiação/diagnóstico por imagem , Pneumonite por Radiação/diagnóstico por imagem , Pneumonite por Radiação/etiologia , Alvéolos Pulmonares/diagnóstico por imagem , Dosagem Radioterapêutica
16.
J Neurol ; 271(5): 2573-2581, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38332351

RESUMO

BACKGROUND AND AIMS: Whether statin treatment is effective in retarding the progression of radiation-induced carotid stenosis (RICS) in head and neck cancer (HNC) survivors has not been well studied. The purpose of this study was to assess the association of statin treatment with RICS progression rate in HNC survivors after radiotherapy. METHODS: We conducted a retrospective cohort study at Sun Yat-sen Memorial Hospital, Sun Yat-sen University in Guangzhou, China. Between January 2010 and December 2021, we screened HNC survivors whose carotid ultrasound scans had shown stenosis of the common and/or internal carotid arteries. The primary outcome was the RICS progression rate. We compared eligible patients treated with statins with those who did not in multivariable Cox regression models. RESULTS: A total of 200 patients were included in this study, of whom 108 received statin treatment and 92 did not. Over a mean follow-up time of 1.5 years, 56 (28.0%) patients showed RICS progression, 24 (42.9%) and 32 (57.1%) in the statin and control groups, respectively. The statin group showed less RICS progression than the control group (adjusted-HR 0.49, 95% CI 0.30-0.80, P = 0.005). In the subgroup analysis, there was no significant interaction in the effect of statins on lowering RICS progression rate in the subgroups stratified by baseline low-density lipoprotein cholesterol (LDL-C) levels (P for interaction = 0.53) or baseline degrees of stenosis (P for interaction = 0.50). CONCLUSIONS: Statin treatment was associated with a lower risk of RICS progression in patients with HNC after radiotherapy, regardless of baseline LDL-C level and baseline stenosis degrees.


Assuntos
Sobreviventes de Câncer , Estenose das Carótidas , Progressão da Doença , Neoplasias de Cabeça e Pescoço , Inibidores de Hidroximetilglutaril-CoA Redutases , Lesões por Radiação , Humanos , Masculino , Feminino , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Estenose das Carótidas/tratamento farmacológico , Pessoa de Meia-Idade , Estudos Retrospectivos , Neoplasias de Cabeça e Pescoço/radioterapia , Neoplasias de Cabeça e Pescoço/tratamento farmacológico , Idoso , Lesões por Radiação/etiologia , Lesões por Radiação/tratamento farmacológico , Lesões por Radiação/diagnóstico por imagem , Adulto , Estudos de Coortes , Seguimentos , Radioterapia/efeitos adversos
17.
J Neurooncol ; 166(3): 535-546, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38316705

RESUMO

BACKGROUND: Adverse radiation effect (ARE) following stereotactic radiosurgery (SRS) for brain metastases is challenging to distinguish from tumor progression. This study characterizes the clinical implications of radiologic uncertainty (RU). METHODS: Cases reviewed retrospectively at a single-institutional, multi-disciplinary SRS Tumor Board between 2015-2022 for RU following SRS were identified. Treatment history, diagnostic or therapeutic interventions performed upon RU resolution, and development of neurologic deficits surrounding intervention were obtained from the medical record. Differences in lesion volume and maximum diameter at RU onset versus resolution were compared with paired t-tests. Median time from RU onset to resolution was estimated using the Kaplan-Meier method. Univariate and multivariate associations between clinical characteristics and time to RU resolution were assessed with Cox proportional-hazards regression. RESULTS: Among 128 lesions with RU, 23.5% had undergone ≥ 2 courses of radiation. Median maximum diameter (20 vs. 16 mm, p < 0.001) and volume (2.7 vs. 1.5 cc, p < 0.001) were larger upon RU resolution versus onset. RU resolution took > 6 and > 12 months in 25% and 7% of cases, respectively. Higher total EQD2 prior to RU onset (HR = 0.45, p = 0.03) and use of MR perfusion (HR = 0.56, p = 0.001) correlated with shorter time to resolution; larger volume (HR = 1.05, p = 0.006) portended longer time to resolution. Most lesions (57%) were diagnosed as ARE. Most patients (58%) underwent an intervention upon RU resolution; of these, 38% developed a neurologic deficit surrounding intervention. CONCLUSIONS: RU resolution took > 6 months in > 25% of cases. RU may lead to suboptimal outcomes and symptom burden. Improved characterization of post-SRS RU is needed.


Assuntos
Neoplasias Encefálicas , Lesões por Radiação , Radiocirurgia , Humanos , Radiocirurgia/efeitos adversos , Radiocirurgia/métodos , Resultado do Tratamento , Estudos Retrospectivos , Incerteza , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/radioterapia , Neoplasias Encefálicas/patologia , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/cirurgia
18.
J Neurooncol ; 166(1): 1-15, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-38212574

RESUMO

PURPOSE: In this study we gathered and analyzed the available evidence regarding 17 different imaging modalities and performed network meta-analysis to find the most effective modality for the differentiation between brain tumor recurrence and post-treatment radiation effects. METHODS: We conducted a comprehensive systematic search on PubMed and Embase. The quality of eligible studies was assessed using the Assessment of Multiple Systematic Reviews-2 (AMSTAR-2) instrument. For each meta-analysis, we recalculated the effect size, sensitivity, specificity, positive and negative likelihood ratios, and diagnostic odds ratio from the individual study data provided in the original meta-analysis using a random-effects model. Imaging technique comparisons were then assessed using NMA. Ranking was assessed using the multidimensional scaling approach and by visually assessing surface under the cumulative ranking curves. RESULTS: We identified 32 eligible studies. High confidence in the results was found in only one of them, with a substantial heterogeneity and small study effect in 21% and 9% of included meta-analysis respectively. Comparisons between MRS Cho/NAA, Cho/Cr, DWI, and DSC were most studied. Our analysis showed MRS (Cho/NAA) and 18F-DOPA PET displayed the highest sensitivity and negative likelihood ratios. 18-FET PET was ranked highest among the 17 studied techniques with statistical significance. APT MRI was the only non-nuclear imaging modality to rank higher than DSC, with statistical insignificance, however. CONCLUSION: The evidence regarding which imaging modality is best for the differentiation between radiation necrosis and post-treatment radiation effects is still inconclusive. Using NMA, our analysis ranked FET PET to be the best for such a task based on the available evidence. APT MRI showed promising results as a non-nuclear alternative.


Assuntos
Neoplasias Encefálicas , Lesões por Radiação , Humanos , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/radioterapia , Imageamento por Ressonância Magnética , Recidiva Local de Neoplasia/patologia , Metanálise em Rede , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/patologia , Metanálise como Assunto
19.
Radiol Imaging Cancer ; 6(1): e230155, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-38276904

RESUMO

Interpretation of posttreatment imaging findings in patients with head and neck cancer can pose a substantial challenge. Malignancies in this region are often managed through surgery, radiation therapy, chemotherapy, and newer approaches like immunotherapy. After treatment, patients may experience various expected changes, including mucositis, soft-tissue inflammation, laryngeal edema, and salivary gland inflammation. Imaging techniques such as CT, MRI, and PET scans help differentiate these changes from tumor recurrence. Complications such as osteoradionecrosis, chondroradionecrosis, and radiation-induced vasculopathy can arise because of radiation effects. Radiation-induced malignancies may occur in the delayed setting. This review article emphasizes the importance of posttreatment surveillance imaging to ensure proper care of patients with head and neck cancer and highlights the complexities in distinguishing between expected treatment effects and potential complications. Keywords: CT, MR Imaging, Radiation Therapy, Ear/Nose/Throat, Head/Neck, Nervous-Peripheral, Bone Marrow, Calvarium, Carotid Arteries, Jaw, Face, Larynx © RSNA, 2024.


Assuntos
Neoplasias de Cabeça e Pescoço , Osteorradionecrose , Lesões por Radiação , Humanos , Recidiva Local de Neoplasia , Neoplasias de Cabeça e Pescoço/diagnóstico por imagem , Neoplasias de Cabeça e Pescoço/terapia , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Lesões por Radiação/terapia , Tomografia por Emissão de Pósitrons/métodos
20.
Clin Neuroradiol ; 34(2): 351-360, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38157019

RESUMO

PURPOSE: Perfusion-weighted (PWI) magnetic resonance imaging (MRI) and O­(2-[18F]fluoroethyl-)-l-tyrosine ([18F]FET) positron emission tomography (PET) are both useful for discrimination of progressive disease (PD) from radiation necrosis (RN) in patients with gliomas. Previous literature showed that the combined use of FET-PET and MRI-PWI is advantageous; hhowever the increased diagnostic performances were only modest compared to the use of a single modality. Hence, the goal of this study was to further explore the benefit of combining MRI-PWI and [18F]FET-PET for differentiation of PD from RN. Secondarily, we evaluated the usefulness of cerebral blood flow (CBF), mean transit time (MTT) and time to peak (TTP) as previous studies mainly examined cerebral blood volume (CBV). METHODS: In this single center study, we retrospectively identified patients with WHO grades II-IV gliomas with suspected tumor recurrence, presenting with ambiguous findings on structural MRI. For differentiation of PD from RN we used both MRI-PWI and [18F]FET-PET. Dynamic susceptibility contrast MRI-PWI provided normalized parameters derived from perfusion maps (r(relative)CBV, rCBF, rMTT, rTTP). Static [18F]FET-PET parameters including mean and maximum tumor to brain ratios (TBRmean, TBRmax) were calculated. Based on histopathology and radioclinical follow-up we diagnosed PD in 27 and RN in 10 cases. Using the receiver operating characteristic (ROC) analysis, area under the curve (AUC) values were calculated for single and multiparametric models. The performances of single and multiparametric approaches were assessed with analysis of variance and cross-validation. RESULTS: After application of inclusion and exclusion criteria, we included 37 patients in this study. Regarding the in-sample based approach, in single parameter analysis rTBRmean (AUC = 0.91, p < 0.001), rTBRmax (AUC = 0.89, p < 0.001), rTTP (AUC = 0.87, p < 0.001) and rCBVmean (AUC = 0.84, p < 0.001) were efficacious for discrimination of PD from RN. The rCBFmean and rMTT did not reach statistical significance. A classification model consisting of TBRmean, rCBVmean and rTTP achieved an AUC of 0.98 (p < 0.001), outperforming the use of rTBRmean alone, which was the single parametric approach with the highest AUC. Analysis of variance confirmed the superiority of the multiparametric approach over the single parameter one (p = 0.002). While cross-validation attributed the highest AUC value to the model consisting of TBRmean and rCBVmean, it also suggested that the addition of rTTP resulted in the highest accuracy. Overall, multiparametric models performed better than single parameter ones. CONCLUSION: A multiparametric MRI-PWI and [18F]FET-PET model consisting of TBRmean, rCBVmean and PWI rTTP significantly outperformed the use of rTBRmean alone, which was the best single parameter approach. Secondarily, we firstly report the potential usefulness of PWI rTTP for discrimination of PD from RN in patients with glioma; however, for validation of our findings the prospective studies with larger patient samples are necessary.


Assuntos
Neoplasias Encefálicas , Glioma , Tomografia por Emissão de Pósitrons , Lesões por Radiação , Humanos , Masculino , Feminino , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/radioterapia , Pessoa de Meia-Idade , Glioma/diagnóstico por imagem , Glioma/radioterapia , Diagnóstico Diferencial , Tomografia por Emissão de Pósitrons/métodos , Adulto , Lesões por Radiação/diagnóstico por imagem , Lesões por Radiação/etiologia , Estudos Retrospectivos , Idoso , Compostos Radiofarmacêuticos , Sensibilidade e Especificidade , Imagem Multimodal/métodos , Tirosina/análogos & derivados , Necrose/diagnóstico por imagem , Angiografia por Ressonância Magnética/métodos , Progressão da Doença , Circulação Cerebrovascular
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