| Zhao Tong,Ma Zixuan,Liu Dandan,et al.A phantom study on the effects of spectral purification technology combined with different shielding approaches on radiation doses to children under third-generation dual-source CT[J].Chinese Journal of Radiological Medicine and Protection,2026,46(8):788-794 |
| A phantom study on the effects of spectral purification technology combined with different shielding approaches on radiation doses to children under third-generation dual-source CT |
| Received:December 22, 2025 |
| DOI：10.3760/cma.j.cn112271-20251222-00440 |
| KeyWords:Spectral purification technology|Shielding effect|Radiation dose|Dual-source CT|Pediatric phantom |
| FundProject:国家自然科学基金(82271988);先进医用材料与医疗器械全国重点实验室项目(YGSKL-SHTech-2025-KF01) |
| Author Name | Affiliation | E-mail | | Zhao Tong | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Ma Zixuan | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Liu Dandan | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Feng Zechen | Beijing Center for Disease Prevention and Control, Beijing 100013, China | | | Zhang Yongxian | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Niu Yantao | Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China | ytniu163@163.com |
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| Abstract:: |
| Objective To explore the effects of spectral purification technology combined with different shielding approaches on the out-of-field radiation doses during dual-source CT scans of pediatric phantoms. Methods Polymethyl methacrylate (PMMA) phantoms were used to simulate five-year-old children. A SOMATOM Force dual-source CT scanner from Siemens Healthineers was employed to perform CT scans of the phantoms. Four tube voltage modes (Sn150 kV, 80 kV/Sn150 kV, 90 kV/Sn150 kV, 100 kV/Sn150 kV) were set, and combined with the wraparound and overlapping shielding approaches. The radiation doses to the centers and surfaces of phantoms at distances of 5, 10 and 15 cm from the scanning field were measured using thermoluminescent dosimeters (TLDs). Then, the dose change rates and ratios of doses outside and inside shielding were calculated, followed by analyses of shielding effects under different conditions. Results Under all tube voltage modes, the radiation doses to the phantom centers and surfaces all decreased after shielding was applied. Notably, these doses decreased significantly with increasing distances from the scanning field edge. For the two shielding approaches, the phantom center and surface showed the maximum dose change rates of 16.60% and 13.76% at 5 cm from the scanning field edge, 21.01% and 26.16% at 10 cm, and 21.80% and 37.23% at 15 cm, respectively. Overall, wraparound shielding exhibited greater dose change rates than overlapping shielding. Under the same tube voltage mode, the phantom center received a higher radiation dose than the phantom surface at the same position. Under varying tube voltage modes, the phantom centers generally exhibited higher dose change rates than the phantom surfaces at a distance of 5 cm from the scanning field edge, while the phantom surfaces displayed more significant dose change rates than the phantom centers at distances of 10 and 15 cm. Under the same volume computed tomography dose index (CTDIvol), both shielding approaches demonstrated better protection effects in the single-source Sn150kV mode than in dual-source modes. When the starting position of shielding was set at 5 cm away from the scanning field, no additional dose was required due to minimal direct exposure to overranging irradiation (22-24 mm). Conclusions When spectral purification technology is applied in pediatric CT scans, shielding measures can reduce radiation doses to examined patients to some extent. Additionally, no additional dose is required when the starting position of shielding is set at 5 cm from the scanning field. |
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