| Sun Jingkun,Peng Gang,Lyu Fajin,Wang Jie,Jin Rui,He Xie.The phantom study of bismuth shielding combined with organ tube current modulation in brain CT[J].Chinese Journal of Radiological Medicine and Protection,2021,41(5):385-389 |
| The phantom study of bismuth shielding combined with organ tube current modulation in brain CT |
| Received:September 13, 2020 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.05.012 |
| KeyWords:Computed tomography Bismuth shielding X-care Radiation dose |
| FundProject: |
| Author Name | Affiliation | E-mail | | Sun Jingkun | Department of Radiology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China | | | Peng Gang | Department of Radiology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China | pg24k@sina.com | | Lyu Fajin | Department of Radiology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China | | | Wang Jie | Department of Radiology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China | | | Jin Rui | Department of Radiology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China | | | He Xie | Department of Radiology, First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China | |
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| Abstract:: |
| Objective To evaluate the application value of bismuth shielding combined with organ tube current modulation (X-care) in brain CT scanning by measuring the radiation dose of sensitive organs. Methods The head and neck phantom was scanned with Siemens dual source CT at the same volume CT dose index (CTDIvol) by X-care, bismuth shielding and x-care combined with bismuth shielding, and by dual energy CT angiography (DE-CTA) with and without bismuth shielding. The CT values of cerebral vessels, adjacent brain tissues and cerebrospinal fluid and image noise were measured, and the contrast noise ratio of cerebral vessels and brain parenchyma was calculated. Organ dose equivalent (HT) was calculated by placing thermoluminescent personal dosimeter (TLD), and CTDIvol and dose length product (DLP) were recorded after each scan. Results Under the same CTDIvol, the mean values of HT,lens with X-care, Bi shielding and X-care combined with Bi shielding were(37.89 ±2.00), (42.20 ±2.96) and (28.21 ±1.31) mSv, respectively, significantly lower than those of conventional sequence scanning(F=186.52,P<0.05). The values of HT,thyroid with Bi shielding and X-care combined with Bi shielding were (0.77 ±0.07) and (0.89 ±0.08) mSv, lower than those of routine brain scan and X-care(F=103.26,P<0.05). The values of HT,lens and HT,thyroidof DE-CTA with bismuth shielding were (11.56 ±1.04) and (0.32 ±0.03) mSv, respectively, significantly lower than those without bismuth shielding(t=5.07,P<0.05). There was no significant difference in noise and CNR in routine brain scan between with and without X-care, bismuth shielding and X-care combined with bismuth shielding. There was no significant difference in noise and CNR in dual energy CTA scanning between with and without Bi shielding. Conclusions Using bismuth shielding and organ tube current modulation, we can significantly reduce organ dose of lens and thyroid during brain CT scanning without sacrificing the image quality. |
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