左心房4D流量细分与高分辨率的对比增强磁共振血管学
Hansuk Kim1,2,3, Stephen B Wilton3,4, Julio Garcia2,3,4,5,6
1Biomedical Engineering, University of Calgary, Calgary, AB, Canada.
Frontiers in cardiovascular medicine
|October 31, 2023
概括
一种新方法使用对比增强磁共振血管造影 (CE-MRA) 在4D流图像中对心房患者进行左心房 (LA) 细分. 这通过超越解决方案限制,改善了血栓风险评估.
科学领域:
- 心血管成像 - 心血管成像
- 医学物理 医学物理
- 生物医学工程 生物医学工程
背景情况:
- 心房动 (AF) 增加了由于心内血栓形成而导致的中风风险.
- 与4D流动相对心血管磁共振 (CMR) 提供了详细的血液流动,但具有分辨率限制.
- 在AF患者的血液动力学分析中,对左心房 (LA) 的准确细分至关重要.
研究的目的:
- 开发和验证一种半自动化方法,以4D流图片对LA进行细分.
- 为了利用标准的对比增强磁共振血管造影 (CE-MRA) 来改善细分.
- 为了促进AF患者血液流动的血液动力学分析.
主要方法:
- 从54名AF患者的4D流数据对LA进行细分,采用两种方法.
- 从相对比MRA (PC-MRA) 获得LA的手动切片对切片细分,该细分来自4D流.
- 从CE-MRA对LA进行半自动细分,然后使用相互信息对4D流坐标进行注册.
主要成果:
- CE-MRA细分量与PC-MRA量有很强的相关性,CE-MRA量大约比PC-MRA量大10%.
- 在两轮注册后,76%的案件取得了成功注册.
- 平均子相似系数 (DSC) 为0.770±0.045,平均表面距离 (ASSD) 为2.704±0.668毫米.
- 平均速度没有显著差异;方法之间的平均静止有3.3%的差异.
结论:
- 拟议的CE-MRA细分和注册方法有效地产生了用于4D流分析的LA细分.
- 这种技术简化了细分,并克服了4D流成像的分辨率限制.
- 该方法有望改善AF患者的血液动力学分析和血栓风险评估.
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