Comparative Study of the Use of Bismuth Shielding on Head Computed Tomography Scans Using Phantoms

Autores/as

  • Fernanda Stephanie Santos Universidade Federal de Minas Gerais image/svg+xml

DOI:

https://doi.org/10.15392/bjrs.v8i1B.936

Palabras clave:

Computed Tomography, Bismuth Shielding, Dosimetry

Resumen

Computed Tomography (CT) has been one of the most used exam for radiologic diagnostic in medicine. The increase of CT is a global concern due to high doses of radiation. The dose evaluation in CT is one of many steps that can contribute for reducing patient doses. The head CT scans helps to diagnose disorders that affect the brain, including tumors, infarction, bleeding within the brain, hematoma and other diseases. The aim of this work is to compare the reduction of absorbed dose in the head CT scan with and without the use of bismuth shielding using a male and female anthropomorphic phantom model Alderson Rando.The head CT scan were done from the cervical vertebra C1 to the top of skull, in a GE CT scanner, LightSpeed VCT model, with 64 channels.Radiochromic films strips were used to evaluate the doses in the organs such as lenses, thyroid, hypophysis, spinal cord, pharynx, breasts, salivary and parotid glands.Record doses were lower with the use of bismuth shielding in both phantoms for all organs, mainly in the lenses. The analysis of noise in the image of the head central slice presented acceptable values for soft tissues, less than 1%. Dose values were significantly reduced and they suggested that the use of bismuth shielding would be a proper procedure for protection during a head CT scan.

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Biografía del autor/a

  • Fernanda Stephanie Santos, Universidade Federal de Minas Gerais
    Department of Nuclear Engineering

Referencias

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INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION ICRP, Statement on tis-sue reactions/early and late effects of radiation in normal tissues and organs-threshold doses for tissue reactions in a radiation protection context, Publication 118 (2012).

P. Colleti et al., “To shield or not to shield: application of bismuth breast shields”, AJR, Vol. 200, pp. 503-507 (2013).

GIADDUI, T; CUI, Y. J; GALVIN, W; CHEN, Y; YU, Y; XIAO, Y. Characteristics of Gafchromic XRQA2 films for kV image dose measurement. Medical Physics, v. 39, p. 842-850, 2012.

MOURÃO, A. P; ALONSO, T. C; SILVA, T. A. Dose profile variation with voltage in head CT scans using radiochromic films. Radiation Physics and Chemistry, v. 95, p. 254-257, 2014.

COSTA, K. C; GOMEZ, A. M. L; ALONSO, T. C; MOURÃO, A. P. Radiochromic film calibration for the RQT9 quality beam. Radiantion Physics and Chemistry, v. 140, p. 370-372, 2017.

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Publicado

2020-09-03

Cómo citar

Comparative Study of the Use of Bismuth Shielding on Head Computed Tomography Scans Using Phantoms. Brazilian Journal of Radiation Sciences (BJRS), Rio de Janeiro, Brazil, v. 8, n. 1B (Suppl.), 2020. DOI: 10.15392/bjrs.v8i1B.936. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/936. Acesso em: 17 jul. 2025.