Volume 4,Issue 5
基于320排宽探测器CT的冠状动脉CT血管成像“双低”扫描策略综述
冠状动脉CT血管成像（CCTA）目前已成为冠心病无创诊断和筛查的常用手段，不过在实际应用中，辐射对人体的影响以及碘对比剂可能带来的肾损伤问题仍需重点关注。320排宽探测器CT（WDCT）借助其16厘米Z轴方向等体素覆盖能力，为从源头降低CCTA检查中的辐射剂量和对比剂使用量提供了技术支持。本文系统梳理了其技术原理、个性化操作、临床验证及问题，重点分析单心动周期采集、前瞻性心电门控容积扫描与低管电压的联合应用，数据显示，通过调整优化扫描方案，有效辐射剂量稳定控制在1 mSv 以内，对比剂用量也可减少到30 mL以下，同时不会影响诊断所需的图像质量。未来光子计数技术与宽探测器结构的结合、标准化且个性化方案的确立、基于风险评估的综合模型构建等方向，将在未来推动“双低”CCTA检查朝着更安全、更精准的方向进步。
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