Assessment of breast absorbed doses during thoracic computed tomography scan to evaluate the effectiveness of bismuth shielding

被引：17
作者：
Alonso, Thessa C. [1 ,2 ]
Mourao, Arnaldo P. [3 ]
Santana, Priscila C. [2 ]
da Silva, Teogenes A. [1 ,2 ]
机构：
[1] CDTN, Ave Presidente Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Belo Horizonte, MG, Brazil
[3] Ctr Fed Educ Tecnol Minas Gerais, CEFET, Belo Horizonte, MG, Brazil
来源：
APPLIED RADIATION AND ISOTOPES | 2016年 / 117卷
关键词：
Thoracic CT scan; Breast and nearby organ absorbed dose in CT; Bismuth shielding; CORONARY CT ANGIOGRAPHY; IMAGE QUALITY;
D O I：
10.1016/j.apradiso.2016.03.018
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
During a lung computed tomography (CT) examination, breast and nearby radiosensitive organs are unnecessarily irradiated because they are in the path of the primary beam. The purpose of this paper is to determine the absorbed dose in breast and nearby organs for unshielded and shielded exposures with bismuth. The experiment was done with a female anthropomorphic phantom undergoing a typical thoracic CT scan, with TLD-100 thermoluminescent detectors insert at breast, lung and thyroid positions. Results showed that dose reduction due to bismuth shielding was approximately 30% and 50% for breast and thyroid, respectively; however, the influence of the bismuth on the image quality needs to be considered. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：55 / 57
页数：3
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