The use of 201Tl SPET to predict the response to radiotherapy in patients with head and neck cancer.
Nucl Med Commun
; 17(11): 935-42, 1996 Nov.
Article
em En
| MEDLINE
| ID: mdl-8971864
ABSTRACT
Thallium-201 (201Tl) is widely used in the diagnosis of malignant tumours. However, its use in predicting the response to radiation therapy for head and neck cancer has not been established. Nineteen patients with histologically proven head and neck cancer were studied. 201Tl single photon emission tomographic (SPET) images were obtained 15 min (early) and 4 h (delayed) post-injection of the radionuclide. For a semi-quantitative assessment, regions of interest were drawn over the lesions and normal soft tissue. Lesion-to-normal tissue uptake ratios of 201Tl activity were measured from mean counts-per-voxel obtained on both the early and delayed scans, representing the early index (EI) and delayed index (DI) respectively. Subsequently, a retention index (RI) was calculated using the formula RI = (DI - EI) x 100/(EI). The patients were classified into two groups according to the effect of radiotherapy a partial response or complete response group (PR-CR group) and a no change group (NC group). In the analysis of primary lesions, both the delayed and retention indexes of the PR-CR group were significantly higher than those of the NC group. However, the early index was not significantly different between the two groups. In the metastatic lymph nodes, only the retention index was significantly different between the two groups. Our results demonstrate that 201Tl SPET and a 201Tl index can be used to predict the response to radiotherapy for primary head and neck cancer and lymph node metastases. The retention index is a useful parameter for estimating the effects of radiotherapy.
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Base de dados:
MEDLINE
Assunto principal:
Tomografia Computadorizada de Emissão de Fóton Único
/
Neoplasias de Cabeça e Pescoço
Tipo de estudo:
Prognostic_studies
/
Risk_factors_studies
Limite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Nucl Med Commun
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Japão