使用钻石辐射采样进行加速运动强壮腹部3D T1ρ映射
Sandeep Panwar Jogi1, Qi Peng2, Ramin Jafari3
1Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
Magnetic resonance in medicine
|September 11, 2025
概括
使用钻石辐射采样和快速MAPSS的新3DT1ρ映射技术显著减少了腹部成像的扫描时间. 这种运动强度方法提供了与标准技术相比较准确的T1ρ量化.
科学领域:
- 磁共振成像 (MRI) 是一种磁共振成像技术.
- 定量成像技术 定量成像技术
- 生物医学工程 生物医学工程
背景情况:
- 腹部3D T1ρ映射对于表征组织属性至关重要,但通常受到长时间扫描和运动工件的限制.
- 现有的方法需要保持呼吸或呼吸门,这对患者来说可能是具有挑战性的,并且仍然可能受到运动的影响.
- 开发更快,运动强大的技术对于腹部定量MRI的常规临床应用至关重要.
研究的目的:
- 开发和验证一种新的,加速的,运动强大的,自由呼吸的腹部3D T1ρ映射技术.
- 将可变密度的钻石辐射k空间采样与快速磁化准备的角度调制的分区k空间破坏的梯度回声快照 (快速MAPSS) 结合起来.
- 与标准技术相比,评估这种新方法的准确性和可行性.
主要方法:
- 3D MAPSS T1ρ成像在3T中对幻影和9名健康志愿者进行.
- 卡特西安采样 (参考) 与星堆和钻石辐射采样进行了比较.
- 使用MAPSS和快速MAPSS的单指数拟合计算T1ρ值,比较不同的旋转锁定时间和采样策略.
主要成果:
- 与星堆相比,钻石辐射采样实现了2.2倍的加速.
- 幻影实验显示了钻石采样和参考卡特西安MAPSS之间的T1ρ差异最小 (<2%).
- 志愿者扫描显示了采样方法和T1ρ量化技术之间的强烈相关性 (R2 ≥0.88),偏差最小 (<1.5 ms).
结论:
- 快速MAPSS与钻石辐射k空间采样相结合,为腹部提供了临床可行的,运动稳固的3D T1ρ映射方法.
- 这种技术显著减少了扫描时间,同时保持了与标准MAPSS方法相比的量化准确性.
- 开发的方法有望在自由呼吸条件下改善腹部定量MRI.
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