Partially parallel imaging with phase-sensitive data: Increased temporal resolution for magnetic resonance temperature imaging
Partially parallel imaging with phase-sensitive data: Increased temporal resolution for magnetic resonance temperature imaging
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DOI：
10.1002/mrm.20378
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发表时间：
2005-03-01
影响因子：
3.3
通讯作者：
Hazle, JD
中科院分区：
文献类型：
--
作者：
Bankson, JA;Stafford, RJ;Hazle, JD
磁共振温度成像可用于监测热消融治疗的进展，提高治疗效果并改善患者安全性。当治疗快速加热组织时，高时间分辨率很重要，但许多快速图像采集的方法会损害图像分辨率、切片覆盖范围或相位灵敏度。部分并行成像技术提供了改善时间分辨率的潜力，而不强迫这样的让步。尽管这些技术扰动图像相位，但是动态采集的相敏图像（诸如针对MR温度成像采集的那些相敏图像）之间的相对相位变化可以通过使用跨系列保持恒定的重建滤波器的部分并行成像技术来可靠地测量。利用该方法，可以通过表面线圈阵列获得部分平行和非加速的相位差敏感数据。通过部分平行和完全傅立叶编码图像测量的平均相位差实际上是相同的，而相位噪声随着g rootL而增加，如在标准部分平行图像采集中一样。
Magnetic resonance temperature imaging can be used to monitor the progress of thermal ablation therapies, increasing treatment efficacy and improving patient safety. High temporal resolution is important when therapies rapidly heat tissue, but many approaches to faster image acquisition compromise image resolution, slice coverage, or phase sensitivity. Partially parallel imaging techniques offer the potential for improved temporal resolution without forcing such concessions. Although these techniques perturb image phase, relative phase changes between dynamically acquired phase-sensitive images, such as those acquired for MR temperature imaging, can be reliably measured through partially parallel imaging techniques using reconstruction filters that remain constant across the series. Partially parallel and non-accelerated phase-difference-sensitive data can be obtained through arrays of surface coils using this method. Average phase differences measured through partially parallel and fully Fourier encoded images are virtually identical, while phase noise increases with g rootL as in standard partially parallel image acquisitions.