Functional MRI using multiple receiver coils: BOLD signal changes and signal-to-noise ratio for three-dimensional-PRESTO vs. single shot EPI in comparison to a standard quadrature head coil
Functional MRI using multiple receiver coils: BOLD signal changes and signal-to-noise ratio for three-dimensional-PRESTO vs. single shot EPI in comparison to a standard quadrature head coil
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DOI：
10.1002/jmri.20101
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发表时间：
2004-08-01
影响因子：
4.4
通讯作者：
Lackner, K
中科院分区：
文献类型：
--
作者：
Hesselmann, V;Girnus, R;Lackner, K
目的：比较单次激发回波平面成像（SSEPI）与三维多激发回波平面成像（EPI）在术中功能性磁共振成像（fMRI）中的性能，其中三维多激发回波平面成像（EPI）基于具有观测序列的回波移位原理（PRESTO），结合标准正交头部线圈和作为替代方案的多接收器线圈。材料和方法：六名健康受试者进行了功能磁共振成像与视觉刺激使用SSEPI和PRESTO序列与两个线圈系统。使用扫描仪后处理软件和SPM 99进行统计学评价。激活体素在视觉皮层的数量，休息和激活之间的百分比信号变化，最后在时间过程中的信噪比（SNR）进行了测量和比较两个线圈系统和两个序列，在四个不同的combination.Results：血氧水平依赖（BOLD）信号的变化是最低的PRESTO和标准的头部线圈和最高的SSEPI和相控阵线圈。对于后一种组合，观察到显著更高的信号变化和更大的激活大小以及更好的SNR。结论：SSEPI是上级，由于其更好的SNR和更高的BOLD信号变化，在定义的设置，无论使用的线圈。在立体定位设置中，相控阵列线圈可用于生成fMRI数据而不损失图像质量。
Purpose: To compare the performance of single shot echo planar imaging (SSEPI) with three-dimensional-multishot echo-planar imaging (EPI) based on principles-of-echoshifting-with-a-train-of-observations (PRESTO) in combination with a standard quadrature head coil and, as an alternative, a multiple receiver coil in intraoperative functional magnetic resonance imaging (fMRI).Materials and Methods: Six healthy subjects underwent fMRI with visual stimulation using a SSEPI and a PRESTO-sequence with both coil systems. Statistical evaluation was done with a scanner-based post-processing software and SPM 99. The number of activated voxels in the visual cortex, the percent signal change between rest and activation, and finally the signal-to-noise ratio (SNR) during time course were measured and compared for both coil systems and both sequences, used in four different combinations.Results: Blood oxygen level dependent (BOLD) signal changes were the lowest with PRESTO and standard head coil and the highest for SSEPI and phased array coil. For the latter combination, a significantly higher signal change and larger activation size was observed together with a better SNR. SSEPI yielded similar performance using both Coils.Conclusion: SSEPI was superior due to its better SNR and a higher BOLD signal change in the defined settings, irrespective of the coil used. In a stereotactical setup the phased array coil can be used to generate fMRI data without loss of image quality.