RESUMO
Craniospinal radiation is one of essential components in the treatment flow for a number of central nervous system malignancies. Meticulous attention to technique and dosimetry is required to produce optimum tumor control. In this paper, an optimized treatment regimen was proposed based on multiple techniques. The CT images for a 17-year-old male patient in need of craniospinal radiation were acquired for 3D conformal treatment planning. The split-beam technique, the extended penumbra fields matching technique, and the multiple leaf collimator segments and extended SSD technique were synthesized in the treatment regimen so as to work out an optimized treatment plan. The added few segments improved the dose homogeneity in spinal cord. The maximal point dose was decreased from 124% to 108% of the prescribed dose in it. Comparative study on the anthropomorphic phantom showed that the data collected by thermoluminescent detectors and the data obtained by calculation were basically coincident. These results suggest that the proposed technique be clinically acceptable.
Assuntos
Adolescente , Humanos , Masculino , Neoplasias Encefálicas , Diagnóstico por Imagem , Radioterapia , Imageamento por Ressonância Magnética , Neoplasias Embrionárias de Células Germinativas , Radioterapia , Radiometria , Métodos , Planejamento da Radioterapia Assistida por Computador , Radioterapia Conformacional , Métodos , Neoplasias da Medula Espinal , Diagnóstico por Imagem , Radioterapia , Tomografia Computadorizada por Raios XRESUMO
To the specificity of equivalent material of human skin mechanical properties, the static-load pressing method for testing the elastic nature of the equivalent material of human skin is proposed, and the designs experimental set for the test is designed. The result show that the method is correct and feasible.
Assuntos
Humanos , Materiais Biomiméticos , Química , Elasticidade , Teste de Materiais , Métodos , Pele , Fenômenos Fisiológicos da Pele , Estresse Mecânico , Engenharia Tecidual , MétodosRESUMO
It is difficult to test the elastic modulus of the soft bio-anthropomorphic materials by using the general stretch-strain test method. With the equipment for a hardness testing system of bio-anthropomorphic materials and millesimal gauge, we introduce in this paper a compress-strain test method and carry out the related test-data curve-fitness. The test results indicate that this kind of method can be adopted in testing the elastic modulus of the soft bio-anthropomorphic materials and help to compare and distinguish the biomechanics equivalent between the tissues.