| Qi Hui,Fang Ping,Cui Dingye,et al.Phantom-based radiation dose assessment in abdominal spectral CT imaging[J].Chinese Journal of Radiological Medicine and Protection,2025,45(5):478-484 |
| Phantom-based radiation dose assessment in abdominal spectral CT imaging |
| Received:August 08, 2024 |
| DOI：10.3760/cma.j.cn112271-20240808-00300 |
| KeyWords:Automatic spectral imaging protocol selection Spectral CT Phantom Radiation dose |
| FundProject:山东省科技发展计划(2014GSF118091);山东省医药卫生发展计划(2017WS715) |
| Author Name | Affiliation | E-mail | | Qi Hui | Department of Radiology, First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Lung Cancer Institute, Shandong Institute of Neuroimmunology, Jinan 250014, China
Graduate School, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, China | | | Fang Ping | Department of Blood Transfusion, First Affiliated Hospital of Shandong First Medical University & Shandong Provincal Qianfoshan Hospital, Jinan 250014, China | | | Cui Dingye | Department of Radiology, First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Lung Cancer Institute, Shandong Institute of Neuroimmunology, Jinan 250014, China | | | Zheng Guangying | Department of Radiology, First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Lung Cancer Institute, Shandong Institute of Neuroimmunology, Jinan 250014, China
Graduate School, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan 250117, China | | | Li Wei | Department of Radiology, First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Lung Cancer Institute, Shandong Institute of Neuroimmunology, Jinan 250014, China | lwqfsh@126.com |
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| Abstract:: |
| Objective To assess the impacts of abdominal spectral computed tomography (CT) scans on radiation dose in order to validate the feasibility of low-dose spectral CT imaging. Methods Using varying scanning protocols on the Discovery CT750 HD device, the abdomen of an adult male dose-specific phantom was scanned in two modes: conventional single-energy CT (SECT) and gemstone spectral imaging (GSI). Specifically, the conventional SECT mode featured tube voltages of 120 and 80 kVp, automatic tube current modulation technology, and a noise index (NI) of 10 HU. In contrast, the GSI mode was characterized by the automatic spectral imaging protocol selection (ASIS) technique, rapid switching of the tube voltage between 80 and 140 kVp, and Nis for non-spectral scanning of 8, 10, 15, and 20 HU. Then, various radiation dose metrics and objective image quality were compared across different scanning protocols. Results In the case of the same NI, the three scanning dose modes (SECT with tube voltages of 120 and 80 kVp, and GSI with a tube voltage of 80/140 kVp) presented similar volume CT dose index (CTDIvol) and dose length product (DLP). However, the SECT with a tube voltage of 80 kVp showed the lowest measured organ absorbed dose (DT; 5.89 mSv). Effective dose (E) was determined using DLP and organ DT. The result indicated that, under the three modes except for SECT with a tube voltage of 80 kVp, the E values calculated using DLP were lower than those determinized using the organ DT, with deviations ranging from 9% to 20%. The differences in image noise levels and signal-to-noise ratios (SNR) of the three scanning modes were statistically significant (F = 65.52, 35.09, P < 0.001). Conclusions Spectral CT using ASIS technology can achieve low-dose spectral scanning while ensuring image quality. |
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