Analysis of thyroid absorbed dose in cervical CT scan with the use of bismuth shielding

Authors

  • Fernanda Stephanie Santos Federal University of Minas Gerais
  • Alvaro Mauricio Ladino Gomez Nuclear Engineer Department at UFMG
  • Clarysson Alberto Melo da Silva Nuclear Engineer Department at UFMG
  • Priscila do Carmo Santana
  • Arnaldo Prata Mourao

DOI:

https://doi.org/10.15392/bjrs.v7i2A.614

Keywords:

Computed Tomography, Dosimetry, Bismuth shielding.

Abstract

The Computed Tomography (CT) has become an important tool to diagnose cancer and to obtain additional information for different clinical questions. Today, it is a very fast, painless and noninvasive test that can be performed high quality images. However, CT scan usually requires a higher radiation exposure dose than a conventional radiography examination. The aim of this study is to determine the dose variation deposited in thyroid and in nearby radiosensitive organs, such as: lenses, pharynx, hypophysis, salivary gland and spinal cord with and without the use of bismuth shielded. A cervical CT scan was performed on anthropomorphic male phantom model Alderson Rando, using a GE scanner, Discovery model with 64 channels. Dose measurements have been performed by using radiochromic film strips to register the individual doses in the organs of interest. The results show us that the thyroid received the highest dose, 24.70 mGy, in the phantom, according to the incidence of the primary X-ray beam.

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Author Biography

Fernanda Stephanie Santos, Federal University of Minas Gerais

Nuclear Engineer Department at UFMG

References

ALONSO, T. C; MOURÃO, A. P; SANTANA, P. C. Assessment of breast absorbed doses during thoracic computed tomography scan to evaluate the effectiveness of bismuth shielding. Applied Radiation and Isotopes, v. 117, p. 55-57, 2016.

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ALEME, C; LYRA, M. A; MOURÃO, A. P. Evaluation in the use of Bismuth Shielding on cervical spine CT scan using a Male Phantom, In: INTERNATIONAL SYMPOSIUM ON SOLID STATE DOSIMETRY, 2014, Cusco., Peru, p. 664-669.

GBELCOVÁ, L; NIKODEMOVA, D; HORVÁTHOVÁ, M. Dose reduction using Bismuth shielding during paediatric CT examinations in Slovakia. Radiation Protection Dosimetry, v. 147, p. 160-163, 2011.

COLLETTI, P. M; MICHELI, O. A; LEE, K. H. To shield or not to shield: application of bismuth breast shields. AJR, v. 200, p. 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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Published

2019-02-19

How to Cite

Santos, F. S., Gomez, A. M. L., Silva, C. A. M. da, Santana, P. do C., & Mourao, A. P. (2019). Analysis of thyroid absorbed dose in cervical CT scan with the use of bismuth shielding. Brazilian Journal of Radiation Sciences, 7(2A (Suppl.). https://doi.org/10.15392/bjrs.v7i2A.614

Issue

Section

The Meeting on Nuclear Applications (ENAN)
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