| 张卓璐,安备,商旭,刘卓,王屹,洪楠.单一时点采集用于降低冠状动脉CT血管成像辐射剂量[J].中国介入影像与治疗学,2026,23(5):300-304 |
| 单一时点采集用于降低冠状动脉CT血管成像辐射剂量 |
| Single-timepoint acquisition for reducing radiation dose in coronary CT angiography |
| 投稿时间：2026-02-09 修订日期：2026-03-25 |
| DOI：10.13929/j.issn.1672-8475.2026.05.009 |
| 中文关键词: 体层摄影术,X线计算机 冠状动脉疾病 辐射剂量 |
| 英文关键词:tomography, X-ray computed coronary artery disease radiation dosage |
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| 中文摘要: |
| 目的 观察单一时点采集对于降低冠状动脉CT血管成像（CCTA）辐射剂量的价值。方法 回顾性纳入205例接受CCTA的疑诊冠心病患者，分别重建其最佳收缩期、最佳舒张期、45%及75% RR间期图像；对比分析上述4组图像质量主观评分、CT值及其标准差（SD）、信噪比（SNR）及所示各节段狭窄程度。采用模拟扫描比较单一时点采集与多期相采集的容积CT剂量指数（CTDIvol）。结果 205例中，113例4组图像主观评分一致，29例（心率46～69次/分）舒张期图像评分高于收缩期，63例（心率70～123次/分）收缩期图像评分高于舒张期。最佳收缩期与45% RR间期图像，以及最佳舒张期与75% RR间期图像的主观评分、CT值、SD、SNR及其所示各节段狭窄程度差异均无统计学意义（P均＞0.05），提示对心率＜70次/分者可仅采集75% RR间期图像，而对心率≥70次/分者可仅采集45% RR间期图像。模拟扫描显示，相比多期相采集，单一时点采集（45%或75% RR间期）可使CTDIvol降低55%～74%。结论 基于45%或75% RR间期单一时点采集可在保证图像质量的前提下降低CCTA辐射剂量。 |
| 英文摘要: |
| Objective To observe the value of single-timepoint acquisition for reducing radiation dose in coronary CT angiography （CCTA）. Methods Totally 205 patients with suspected coronary artery diseases who underwent CCTA were retrospectively enrolled. The optimal systolic， optimal diastolic， 45% and 75% RR interval images were reconstructed. The subjective scores of image quality， CT values and their standard deviations （SD）， signal-to-noise ratios （SNR）， and the degree of stenosis in each segment in above 4 groups of images were analyzed and compared. The volume CT dose index （CTDIvol） was compared between single-timepoint and multi-phase acquisitions by simulated scanning. Results Among the 205 cases， the consistent subjective scores in 4 groups of images could be seen in 113 cases， the scores in diastolic images were higher than in systolic images in 29 cases （heart rate 46—69 beats/min）， and the scores in systolic images were higher than in diastolic images in 63 cases （heart rate 70—123 beats/min）. No significant difference in subjective scores， CT values， SD， SNR nor the degree of stenosis in each segment between optimal systolic and 45% RR interval images， as well as between optimal diastolic and 75% RR interval images was found （all P＞0.05）. Based on this， for patients with heart rate＜70 beats/min， only collected 75% RR interval images was sufficient， and for those with heart rate≥70 beats/min， only collected 45% RR interval images was sufficient. Simulated scanning showed that compared to multi-phase acquisition， single-timepoint acquisition （45% or 75% RR interval） could reduce CTDIvol by 55%—74%. Conclusion Single-timepoint acquisition based on 45% or 75% RR interval could reduce CCTA radiation dose while ensuring image quality. |
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