Avaliação radiométrica da distribuição de dose de radiação em lesões dermatológicas submetidas à radioterapia

• Autor(a) principal: Nunes, Isabella Paziam Fernandes [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/142910; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2016-07-08/000867345.pdf
• topic: Radiação - Dosimetria; Pele - Cancer - Tratamento; Radioterapia; Radiação ionizante; Feixes de eletrons; Dermatologia; Skin - Cancer

The work analyzes the distribution of radiation dose, the profile and the behaviour of the beams emitted by radiotherapy equipment clinical indicated for the treatment of dermatological lesions. The therapeutic response is checked depending on the energy of the beam. We analyzed X-ray beams to 75 kV and 100 kV superficial radiotherapy equipment, Philips RT 250, and the gamma ray beam (E = 1.25 MV) Cobalto Machine, Theratron 80, both used in Hospital Estadual Manoel de Abreu in Bauru. The analysis of the distribution of radiation dose in electron beams with energies of 4.0 MeV, 6.0 MeV, 9.0 MeV, 12.0 MeV and 15.0 MeV was held at Linear Acceleration, Varian 2100C model, of Hospital das Clínicas da Faculdade de Medicina de Botucatu in Botucatu. For the measures of radiation dose was used a fantom and a set with dosimetric electrometer and ionization chamber PTW brand, calibrated for the energy range of radiotherapy. thermoluminescent dosimeters (TLDs) were applied for obtaining dose-response linearity curve of beams of electrons. Regarding the penetration in the tissues, it is concluded that both the beams of x-rays and electron beams can achieve depths consistent with the clinical characteristics of skin tumors. The electron beams have the advantage of providing better distribution of dose, minimizing the effects of exposure of healthy peripheral tissues to the lesion treated, the greater variability of the dimensions of radiation fields and less exposure time. The work has provided a better understanding of the radiation dose released in routine radiotherapy, guiding the procedures, quantifying the irradiation in healthy cells adjacent to the radiation field, minimizing the deleterious effects of radiation which involve directly on patients' quality of life