Your browser doesn't support javascript.
loading
Comparison of positron emission tomography (PET) and computed tomography (CT) for better target volume definition in radiation therapy planning
Vila, A; Sánchez-Reyes, A; Conill, C; Gispert, JD; Trampal, C; Láinez, C; Vayreda, J; Pedro, A.
Afiliación
  • Vila, A; Hospital Platóp. Barcelona. Spain
  • Sánchez-Reyes, A; Hospital Platóp. Barcelona. Spain
  • Conill, C; Hospital Clinic. Institut de Malalties Hemato-Oncológiques. Barcelona. Spain
  • Gispert, JD; CRC Corpòració Sanitaria. CRC Mar. Barcelona. Spain
  • Trampal, C; CRC Corpòració Sanitaria. Institu d´Alta Tecnologia - PRBB. Barcelona. Spain
  • Láinez, C; Hospital Platóp. Barcelona. Spain
  • Vayreda, J; Institut Catalá d´Oncologia – ICO-Girona. Girona. Spain
  • Pedro, A; Hospital Platóp. Barcelona. Spain
Clin. transl. oncol. (Print) ; 12(5): 367-373, mayo 2010. tab, ilus
Article en En | IBECS | ID: ibc-124083
Biblioteca responsable: ES1.1
Ubicación: BNCS
ABSTRACT

BACKGROUND:

In cancer patients, positron emission tomography/ computed tomography (PET/CT) fused images present less variability in target contouring, respect to use only CT images, respectively. However, the gold standard has not yet been clearly established between radiation oncologists with regard to PET images and the methodology of contouring targets with confidence using PET/CT fused images. The aim of this study was to determine whether integrated PET/CT fused images provide advantages in virtual simulation compared with morphological contouring only with CT. MATERIAL AND

METHODS:

Thirty cancer patients were evaluated in an adapted PET/CT hybrid in radiotherapy (RT) setup position, with 20 of them being suitable for RT 17 were suitable for curative intent, which was the group of interest in this study. All image series were sent to the RT work station (WS) where CT and PET series were automatically fused by Digital Imaging and Communications in Medicine (DICOM) in each case. PET series were threshold and were subjected to source-to-background contrast algorithms to fi nally redefine the original tumour description. Three different radiotherapy plans (RTP) for each patient were compared after targets were contoured [1] planning over metabolic (PET) contoured targets, [2] planning over only morphologic (CT) targets, and [3] planning over targets obtained for treatment based on fused PET/CT images.

RESULTS:

PET/CT findings altered initial-stage planning in four patients (23.5%) because they had been undergoing chemotherapy. Gross target volume (GTV) and planning target volume (PTV) based only on PET showed more homogeneity to obtain mean doses (p = 0.025) with respect to those based on PET/CT, respectively. However, no percentage differences were observed in median PTV doses between the planning methods, although there was higher variability in PET/CT planning. Morphological (CT) and PET/ CT target volumes were more voluminous than metabolic (PET) volumes. On the other hand, 20% of metabolic (PET) PTV were out of those defined by PET/CT. Thoracic RT plans based on PET preserved better bilateral lung [percentage volume of lung irradiated with a dose of 20 Gy (V20); significance, R(2) = 0.559, p = 0.006].

CONCLUSIONS:

For our physicians, PET/CT fused images allowed better contouring of primary tumours in 40% of head and neck cancers and 34% of thoracic cancers. PET/CT provides useful information for virtual simulation therapy. Image treatment and planning in an RT workstation is mandatory (AU)
Asunto(s)
Buscar en Google
Colección: 06-national / ES Base de datos: IBECS Asunto principal: Planificación de la Radioterapia Asistida por Computador / Tomografía Computarizada por Rayos X / Tomografía de Emisión de Positrones / Carga Tumoral / Neoplasias Tipo de estudio: Evaluation_studies / Prognostic_studies Límite: Aged / Female / Humans / Male Idioma: En Revista: Clin. transl. oncol. (Print) Año: 2010 Tipo del documento: Article
Buscar en Google
Colección: 06-national / ES Base de datos: IBECS Asunto principal: Planificación de la Radioterapia Asistida por Computador / Tomografía Computarizada por Rayos X / Tomografía de Emisión de Positrones / Carga Tumoral / Neoplasias Tipo de estudio: Evaluation_studies / Prognostic_studies Límite: Aged / Female / Humans / Male Idioma: En Revista: Clin. transl. oncol. (Print) Año: 2010 Tipo del documento: Article