ASSESSMENT OF PATIENT DOSE REDUCTION BY BISMUTH SHIELDING IN CT USING MEASUREMENTS, GEANT4 AND MCNPX SIMULATIONS

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Mendes, M (Autor) Outra; Costa, F (Autor) Outra; Figueira, C (Autor) Outra; Madeira, P (Autor) Outra; Teles, P (Autor) Outra; Vaz, P (Autor) Outra

Revista

Título: Radiation Protection Dosimetry

Vol. 165

Páginas: 175-181

ISSN: 0144-8420

Editora: Oxford University Press

Indexação

ISI Web of Knowledge - 13 Citações

Scopus - 14 Citações

Outras Informações

ID Authenticus: P-00G-FKB

DOI: 10.1093/rpd/ncv059

Abstract (EN): This work reports on the use of two different Monte Carlo codes (GEANT4 and MCNPX) for assessing the dose reduction using bismuth shields in computer tomography (CT) procedures in order to protect radiosensitive organs such as eye lens, thyroid and breast. Measurements were performed using head and body PMMA phantoms and an ionisation chamber placed in five different positions of the phantom. Simulations were performed to estimate Computed Tomography Dose Index values using GEANT4 and MCNPX. The relative differences between measurements and simulations were <10 %. The dose reduction arising from the use of bismuth shielding ranges from 2 to 45 %, depending on the position of the bismuth shield. The percentage of dose reduction was more significant for the area covered by the bismuth shielding (36% for eye lens, 39 % for thyroid and 45 % for breast shields).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7