RESUMO
The somatic dose index was determined for large-field irradiations with the 10 MeV bremsstrahlung of a linear accelerator. Among the possible field shapes, the authors investigated the mantle field, the inverted Y field, the boomerang field, as well as total body irradiation and upper and lower partial body irradiation. The measured data are discussed with respect to clinical aspects.
Assuntos
Doses de Radiação , Radioterapia de Alta Energia/métodos , Humanos , Aceleradores de Partículas , Risco , Irradiação Corporal TotalRESUMO
Arterio-venous malformations of the brain are accompanied by a risk of hemorrhages which increases in the course of time. Thus a therapy is indicated as soon as the arterio-venous malformation is discovered. If surgical treatment is contra-indicated, radiotherapy can be applied with a high rate of success (obliteration of the arterio-venous malformation after two years in up to 88% of cases). Percutaneous radiotherapy has to be performed with a stereotaxic technique under controlled conditions. The stipulations for this treatment are described on the basis of our own method. Between August 1982 and July 1983, twenty patients have been treated without any complications due to therapy or to the disease. This form of radiotherapy using the bremsstrahlung of a linear accelerator can be considered as an alternative method with respect to proton irradiation.
Assuntos
Malformações Arteriovenosas/radioterapia , Encéfalo/irrigação sanguínea , Adolescente , Adulto , Idoso , Criança , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Tolerância a Radiação , Técnicas EstereotáxicasRESUMO
The somatic dose index for irradiation of the brain was determined for the 10 MeV bremsstrahlung of a linear electron accelerator. A small volume rotation technique and the irradiation of the total neurocranium were chosen as extreme conditions for the radiation exposure of the skull. On the basis of a target volume dose of 50 Gy for the total irradiation series, the somatic dose index of the small volume technique is within the scope of coronarography. In case of irradiation of the total neurocranium, however, the somatic dose index largely exceeds the maximum values of X-ray diagnosis.
