| Gu Jianhua,Lu Xiuliang,Zhuo Weihai,Fan Dunhuang.Methods and effects of abdominal and pelvic shielding for pediatric chest CT examinations[J].Chinese Journal of Radiological Medicine and Protection,2014,34(4):298-301 |
| Methods and effects of abdominal and pelvic shielding for pediatric chest CT examinations |
| Received:September 04, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.04.016 |
| KeyWords:Chest CT scans Gonad Colon Shielding effects |
| FundProject:国家自然科学基金（11075040）；上海市公共卫生优秀学科带头人培养计划（GWDTR201206） |
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| Abstract:: |
| Objective To investigate the methods and effects of abdominal and pelvic shielding for pediatric chest CT examinations. Methods The 705-D phantom made by Computerized Imaging Reference Systems (CIRS) was used to replace a 5-year-old child, thermoluminescent dosimeters were set in the abdomen and pelvis to measure the organ and tissue doses. Chest scans were conducted with the routine protocol for pediatric chest CT examinations. Doses to main organs and tissues in the abdomen and pelvis were measured after chest CT scans without lead apron, with lead apron covering anterior of the abdomen and pelvis and with apron wrapping same part, respectively.Results Absorbed doses to some abdominal organs near the irradiation field were up to several mGy in a procedure of pediatric chest CT examination. There were statistically significant differences among the dose values for three different scans at the same location (χ2=16.00,P<0.05). Statistically significant difference was also found between the dose values for scans, which were measured with wrapping and covering approaches (Z=-2.52,P<0.05). Compared to the doses in the condition of no shielding, the doses in testis and colon reduced by 71.2% and 42.3%, respectively, if the abdomen and pelvis was wrapped with a lead apron (0.35 mm Pb), and reduced by 55.9% and 26.1%, respectively, if the same lead apron was used to cover the anterior of the abdomen and pelvis. Conclusions In pediatric chest CT examinations, the use of a lead apron can effectively shield the abdomen and pelvis, and plays an important role in protection of the gonad and colon. The wrapping measure is worth being recommended. |
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