Accelerating cine phase-contrast flow measurements using k-t BLAST and k-t SENSE
Accelerating cine phase-contrast flow measurements using k-t BLAST and k-t SENSE
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DOI：
10.1002/mrm.20730
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发表时间：
2005-12-01
影响因子：
3.3
通讯作者：
Boesiger, P
中科院分区：
文献类型：
--
作者：
Baltes, C;Kozerke, S;Boesiger, P
在上升主动脉中的常规相对比速度映射与K-T BLAST和K-T SENSE相结合。达到了高达5.3倍的净加速度，从而实现了单次呼吸的收购。对速度编码段的交织采集进行了交织的标准相位对比（PC）序列进行了修改，以在两个阶段收集数据，高分辨率下采样和低分辨率完全采样的训练阶段。此外，测试了K-T重建策略的修改。该策略被称为“插件”，将在培训阶段获取的数据中纳入最终重建中，以提高数据一致性，类似于常规的钥匙孔。发现“ K-T Sense插件”可提供最佳的图像质量和最准确的流量量化。对于此策略，至少需要10个训练轮廓才能产生准确的中风量（相对偏差
Conventional phase-contrast velocity mapping in the ascending aorta was combined with k-t BLAST and k-t SENSE. Up to 5.3-fold net acceleration was achieved, enabling single breath-hold acquisitions. A standard phase-contrast (PC) sequence with interleaved acquisition of the velocity-encoded segments was modified to collect data in 2 stages, a high-resolution undersampled and a low-resolution fully sampled training stage. In addition, a modification of the k-t reconstruction strategy was tested. This strategy, denoted as "plug-in," incorporates data acquired in the training stage into the final reconstruction for improved data consistency, similar to conventional keyhole. "k-t SENSE plug-in" was found to provide best image quality and most accurate flow quantification. For this strategy, at least 10 training profiles are required to yield accurate stroke volumes (relative deviation