Lee C C, Jack C R, Rossman P J, Riederer S J
Department of Diagnostic Radiology, Mayo Clinic, Rochester, MN 55905, USA.
AJNR Am J Neuroradiol. 1998 Aug;19(7):1297-300.
Access to fully processed activation maps in near real time during a functional MR examination enables run-to-run assessment of results. This is particularly useful in clinical studies, since the results of the functional MR examination can be ascertained before the patient leaves the MR suite, permitting interactive tailoring of the functional MR study. We describe how a real-time MR system can be customized to complete the following tasks in less than 3 minutes: obtain an 81-second acquisition of a multisection functional MR imaging time series using single-shot echo-planar imaging, perform image reconstruction, extract functional MR activation maps using cross-correlation and thresholding, and superimpose activation maps on previously acquired T1-weighted anatomic images.
在功能磁共振成像（fMRI）检查过程中近乎实时地获取经过完全处理的激活图，能够对每次扫描结果进行逐次评估。这在临床研究中尤为有用，因为在患者离开磁共振成像室之前就能确定功能磁共振成像检查的结果，从而可以对功能磁共振成像研究进行交互式调整。我们描述了如何定制一个实时磁共振成像系统，以便在不到3分钟的时间内完成以下任务：使用单次激发回波平面成像技术对多层面功能磁共振成像时间序列进行81秒的采集，进行图像重建，使用互相关和阈值处理提取功能磁共振激活图，并将激活图叠加到先前采集的T1加权解剖图像上。
