放射能可比剂量水平的光子计数胸部CT:对机会主义视觉和半自动冠状动脉量化的影响
Jonas Kroschke1, Bjarne Kerber, Matthias Eberhard
1From the Institute for Diagnostic and Interventional Radiology, University Hospital Zurich, University Zurich, Zurich, Switzerland.
Investigative radiology
|April 24, 2025
概括
光子计数检测器CT (PCCT) 允许低剂量肺癌查. 然而,将PCCT剂量降低到胸部放射水平显著低估了冠状动脉化视觉,影响了风险评估.
科学领域:
- 放射学 放射学是一门学科.
- 医疗成像医学成像
- 心血管成像 - 心血管成像
背景情况:
- 光子计数探测器计算机断层扫描 (PCCT) 提供剂量降低潜力,对于肺癌查至关重要.
- 冠状动脉化 (CAC) 是肺癌查中的一个重要偶然发现.
- 在非常低的辐射剂量下评估CAC,与胸部X射线相比,具有临床意义.
研究的目的:
- 评估剂量降低到胸部放射水平对使用PCCT对CAC机会性评估的影响.
- 为了在减少辐射剂量时比较视觉和半自动CAC评分方法.
主要方法:
- 68名患者接受了两种剂量级别的非对比胸部PCCT:低剂量 (图像质量12) 和放射-可比剂量 (图像质量2).
- 用视觉评分 (CAD-RADS 2.0,Shemesh) 和半自动定量分析来评估冠状动脉化.
- 图像质量使用利克特尺度进行评估.
主要成果:
- 与低剂量PCCT相比,放射能可比剂量的PCCT导致图像质量和CTDI显著降低.
- 视觉评分显示,在放射相对应的剂量下,CAC显著低估,导致从轻度化到无化再分类.
- 半自动分析显示,两种剂量水平之间的CAC评分没有显著差异,与视觉评分有很强的相关性和很好的一致性.
结论:
- 在放射剂量PCCT上对CAC的视觉评估是不可靠的,并低估了化,特别是在进一步降低剂量时.
- 半自动化CAC分析在非常低的辐射剂量下提供更强大和更一致的结果.
- 虽然可以识别出高心血管风险,但由于视觉低估,在放射剂量PCCT中排除风险是不可能的.
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