| LIU Hai-kuan,ZHUO Wei-hai,CHEN Bo,YI Yan-ling,LI De-hong.Organ dose evaluation for CT scans based on in-phantom measurements[J].Chinese Journal of Radiological Medicine and Protection,2009,29(2):221-224 |
| Organ dose evaluation for CT scans based on in-phantom measurements |
| Received:July 15, 2008 |
| DOI：10.3760/cma.j.issn.0254-5098.2009.02.038 |
| KeyWords:CT scan Anthropomorphic phantom Radiophotoluminescent glass dosimeter Organ dose Tissue weighting factors |
| FundProject:国家自然科学基金(10675036); 教育部新世纪优秀人才支持计划 (NCET-07-0213) |
| Author Name | Affiliation | E-mail | | LIU Hai-kuan | Institute of Radiation Medicine, Fudan University, Shanghai 200032, China | whzhuo@fudan.edu.cn | | ZHUO Wei-hai | Institute of Radiation Medicine, Fudan University, Shanghai 200032, China | | | CHEN Bo | Institute of Radiation Medicine, Fudan University, Shanghai 200032, China | | | YI Yan-ling | Institute of Radiation Medicine, Fudan University, Shanghai 200032, China | | | LI De-hong | Institute of Radiation Medicine, Fudan University, Shanghai 200032, China | |
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| Abstract:: |
| Objective To explore the organ doses and their distributions in different projections of CT scans.Methods The CT values were measured and the linear absorption coefficients were derived for the main organs of the anthropomorphic phantom to compare with the normal values of human beings. The radiophotoluminescent glass dosimeters were set into various tissues or organs of the phantom for mimic measurements of the organ doses undergoing the head, chest, abdomen and pelvis CT scans, respectively.Results The tissue equivalence of the phantom used in this study was good. The brain had the largest organ dose undergoing the head CT scan. The organ doses in thyroid, breast, lung and oesophagus were relatively large in performing the chest CT scan, while the liver, stomach, colon and lung had relatively large organ doses in abdomen CT practice. The doses in bone surface and colon exceeded by 50 mGy in a single pelvis CT scan.Conclusion The organ doses and their distributions largely vary with different projections of CT scans. The organ doses of colon, bone marrow, gonads and bladder are fairly large in performing pelvis CT scan, which should be paid attention in the practice. |
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