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Effects of bismuth breast shielding on iodine quantification in dual-energy computed tomography: an experimental phantom study

Authors
 Hyunsik Jang  ;  Jin Hur  ;  Byoung Wook Choi  ;  Dong Jin Im  ;  Yoo Jin Hong  ;  Young Jin Kim  ;  Hye-Jeong Lee 
Citation
 Acta Radiologica, Vol.59(12) : 1475-1481, 2018 
Journal Title
 Acta Radiologica 
ISSN
 0284-1851 
Issue Date
2018
Keywords
Bismuth ; dual-energy computed tomography ; iodine ; radiation dosage ; radiation protection
Abstract
BACKGROUND: Although the bismuth breast shield can reduce radiation exposure to the breast during dual-energy computed tomography (DECT), it can potentially affect material quantification on DECT due to artifacts. PURPOSE: To evaluate the effects of bismuth breast shielding on iodine quantification and radiation exposure in DECT. MATERIAL AND METHODS: Small balloons were made with 0.2%, 0.6% and 1.0% blended iodinated contrast (370 mg/mL of iodine) with water. The balloons were located at both anterior and posterior lungs in an adult anthropomorphic chest phantom. DECT was performed with and without breast shielding. Afterwards, iodine concentration values were measured for each balloon on the iodine maps. Absorbed radiation doses in the breast were measured with the optically stimulated luminescence dosimeter. RESULTS: After shielding, we obtained significantly decreased iodine quantification for all three concentrations with 0.78 ± 0.13 to 0.46 ± 0.13 mg/mL, 2.31 ± 0.17 to 1.68 ± 0.19 mg/mL, and 3.82 ± 0.10 to 2.84 ± 0.20 mg/mL at the anterior location, and 0.72 ± 0.11 to 0.48 ± 0.09 mg/mL, 2.24 ± 0.13 to 1.87 ± 0.21 mg/mL, and 3.75 ± 0.16 to 3.15 ± 0.14 mg/mL at the posterior location for the 0.2%, 0.6%, and 1.0% balloons, respectively ( P = 0.001 for all). After shielding, absorbed radiation doses to the breast significantly decreased by 14.8% (4.32 ± 0.33 to 3.68 ± 0.30 mGy; P = 0.005). CONCLUSION: Although using the bismuth breast shield may decrease radiation exposure to the breast on DECT, it may also significantly affect iodine quantification.
Full Text
https://journals.sagepub.com/doi/full/10.1177/0284185118768098
DOI
10.1177/0284185118768098
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
Yonsei Authors
김영진(Kim, Young Jin) ORCID logo https://orcid.org/0000-0002-6235-6550
이혜정(Lee, Hye Jeong) ORCID logo https://orcid.org/0000-0003-4349-9174
임동진(Im, Dong Jin) ORCID logo https://orcid.org/0000-0001-8139-5646
최병욱(Choi, Byoung Wook) ORCID logo https://orcid.org/0000-0002-8873-5444
허진(Hur, Jin) ORCID logo https://orcid.org/0000-0002-8651-6571
홍유진(Hong, Yoo Jin) ORCID logo https://orcid.org/0000-0002-7276-0944
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/167127
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