| 赵彤,马梓轩,刘丹丹,等.第三代双源CT能谱纯化技术结合不同屏蔽方式对儿童辐射剂量影响的模体研究[J].中华放射医学与防护杂志,2026,46(8):788-794.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].Chin J Radiol Med Prot,2026,46(8):788-794 |
| 第三代双源CT能谱纯化技术结合不同屏蔽方式对儿童辐射剂量影响的模体研究 |
| 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 |
| 投稿时间：2025-12-22 |
| DOI：10.3760/cma.j.cn112271-20251222-00440 |
| 中文关键词: 能谱纯化技术|屏蔽效果|辐射剂量|双源CT|儿童模体 |
| 英文关键词:Spectral purification technology|Shielding effect|Radiation dose|Dual-source CT|Pediatric phantom |
| 基金项目: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) |
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| 中文摘要: |
| 目的 探究双源CT能谱纯化技术结合不同屏蔽方式对儿童模体扫描野外辐射剂量的影响。方法 采用西门子双源Force CT机,以聚甲基丙烯酸甲酯(PMMA)模体模拟5岁儿童体型,设置4种管电压模式(Sn150 kV、80 kV/Sn150 kV、90 kV/Sn150 kV、100 kV/Sn150 kV),配合覆盖式和包裹式两种屏蔽方式进行扫描。通过热释光探测器(TLD)测量模体中心及表面在扫描野外5、10、15 cm处的辐射剂量,计算剂量变化率和屏蔽外内剂量比,分析不同条件下的防护效果。结果 所有管电压模式下,施加屏蔽后模体中心及表面辐射剂量均降低,且随着与扫描野边缘距离的增加显著下降。两种屏蔽方式时,扫描野外5 cm处中心剂量和表面剂量变化率最大值为16.60%和13.76%,10 cm处为21.01%和26.16%,15 cm处为21.80%和37.23%。包裹式屏蔽的剂量变化率整体大于覆盖式屏蔽。相同管电压下,模体中心剂量高于同位置表面剂量。不同管电压时,扫描野外5 cm处中心剂量变化率整体高于表面,10和15 cm处则表面剂量变化率更显著。单源Sn150 kV模式在相同容积CT剂量指数(CTDIvol)下的两种屏蔽防护效果均优于双源模式。屏蔽起始位置置于扫描野外5 cm处时,未受超范围扫描(22~24 mm)直接照射影响,剂量无额外增加。结论 儿童CT检查应用能谱纯化技术时,屏蔽防护措施可在一定程度上降低受检者辐射剂量,屏蔽起始位置距离扫描野5 cm时不会增加额外剂量。 |
| 英文摘要: |
| 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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