切趾
翻转角度
k-空间
成像体模
灵敏度(控制系统)
光学
核磁共振
物理
图像分辨率
材料科学
磁共振成像
电子工程
傅里叶变换
医学
放射科
工程类
量子力学
作者
C Mirkes,G Shajan,J Bause,Kai Buckenmaier,Jens Hoffmann,Klaus Scheffler
摘要
Efficient acquisition of triple-quantum-filtered (TQF) sodium images at ultra-high field (UHF) strength.A three-pulse preparation and a stack of double-spirals were used for the acquisition of TQF images at 9.4 Tesla. The flip angles of the TQ preparation were smoothly reduced toward the edge of k-space along the partition-encoding direction. In doing so, the specific absorption rate could be reduced while preserving the maximal signal intensity for the partitions most relevant for image contrast in the center of k-space. Simulations, phantom and in vivo measurements were used to demonstrate the usefulness of the proposed method.A higher sensitivity (∼ 20%) was achieved compared to the standard acquisition without flip angle apodization. Signals from free sodium ions were successfully suppressed irrespective of the amount of apodization used. B0 corrected TQF images with a nominal resolution of 5 × 5 × 5 mm(3) and an acceptable signal-to-noise ratio could be acquired in vivo within 21 min.Conventional TQF in combination with flip angle apodization permits to exploit more efficiently the increased sensitivity available at 9.4T.
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