通过血管编码的动脉旋转标签在威利斯圆以上实现强大的标签
Hongwei Li1,2, Yang Ji2,3, He Wang1,4
1Institute of Science and Technology for Brain-inspired Intelligence, Fudan University, Shanghai, People's Republic of China.
Magnetic resonance in medicine
|July 1, 2025
概括
这项研究引入了一种改进的优化编码方案 (IOES),用于血管编码的动脉旋转标签 (VEASL),以增强非侵入性脑成像. 这种新方法提高了信号噪声比,并准确地绘制了复杂的大脑血管系统,有助于研究像莫亚莫亚病这样的疾病.
科学领域:
- 神经成像是一种神经成像.
- 医学物理 医学物理
- 血管生物学 血管生物学
背景情况:
- 非侵入性血管选择性成像对于理解大脑输液至关重要.
- 复杂的血管几何形状,如威利斯圆 (CoW) 上方的血管,对当前的成像技术构成挑战.
- 动脉旋转标记 (ASL) 方法,包括血管编码的ASL (VEASL),提供非侵入性的输液量化.
研究的目的:
- 为了提高血管编码动脉旋转标签 (VEASL) 的稳定性,用于非侵入性血管选择性输液成像和血管造影.
- 为了提高复杂的血管几何形状的成像准确性,特别是威利斯圆 (CoW) 以上.
主要方法:
- 开发和实施一个改进的优化编码方案 (IOES),更好地考虑血管几何和VEASL过程.
- 为更薄的标记区域优化伪连续动脉旋转标记 (PCASL) 参数,以准确地表示曲的血管.
- 将IOES方法与健康志愿者的原始优化编码方案 (OES) 进行比较,并对Moyamoya患者进行初步应用.
主要成果:
- 模拟显示IOES的信号噪声比 (SNR) 效率提高了10%左右,并使用了对运动不那么敏感的更长波长编码.
- 优化的PCASL参数减少了有效的标签厚度,同时保持了高的标签效率.
- 在健康的志愿者中,该方法能够分离至少九条动脉,并改善了血管解码和信号对齐.
- 在Moyamoya患者中观察到与血管学相一致的血管区域.
结论:
- 结合IOES和优化的PCASL参数,在Cow以上的复杂血管区域显著提高了血管解码效率.
- 自动编码设计和快速扫描时间 (<6分钟) 支持观察Cow流动模式的临床可行性.
- 这种技术对于研究神经疾病中的附带循环特别有价值.
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