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

Title
ASSESSMENT OF PATIENT DOSE REDUCTION BY BISMUTH SHIELDING IN CT USING MEASUREMENTS, GEANT4 AND MCNPX SIMULATIONS
Type
Article in International Scientific Journal
Year
2015
Authors
Mendes, M
(Author)
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Costa, F
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Figueira, C
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Madeira, P
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Teles, P
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Vaz, P
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Journal
Vol. 165
Pages: 175-181
ISSN: 0144-8420
Other information
Authenticus ID: P-00G-FKB
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).
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 7
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