Pruessmann K P, Weiger M, Boesiger P
Institute of Biomedical Engineering and Medical Informatics, University of Zurich and Swiss Federal Institute of Technology Zurich.
J Cardiovasc Magn Reson. 2001;3(1):1-9. doi: 10.1081/jcmr-100000143.
Imaging speed is a key factor in most cardiovascular applications of magnetic resonance imaging. Recently, simultaneous signal acquisition with multiple coils has received increasing attention as a means of enhancing scan speed in MRI. Based on this approach, the sensitivity encoding technique SENSE enables substantial scan time reduction by exploiting the inherent spatial encoding effect of receiver coil sensitivity. This work studies the benefit of sensitivity encoding for cardiovascular MRI. SENSE is applied to accelerate common breath-hold imaging as well as real-time imaging by factors up to 3.2. In the breath-hold mode with ECG triggering, this speed benefit has been used both for reducing the breath-hold interval and for improving spatial resolution. In cardiac real-time imaging without triggering and breath control, the SENSE approach has enabled significantly enhanced temporal resolution, ranging down to 13 ms (77 frames/s). Cardiac real-time SENSE is demonstrated in several modes, including real-time imaging of three parallel slices at a rate of 25 triple frames per second.
成像速度是磁共振成像在大多数心血管应用中的关键因素。近来，多线圈同步信号采集作为提高磁共振成像扫描速度的一种方法受到了越来越多的关注。基于这种方法，灵敏度编码技术SENSE通过利用接收线圈灵敏度固有的空间编码效应，能够大幅减少扫描时间。本研究探讨了灵敏度编码在心血管磁共振成像中的优势。SENSE被应用于加速常规屏气成像以及实时成像，加速因子高达3.2。在心电图触发的屏气模式下，这种速度优势既被用于缩短屏气间隔，也被用于提高空间分辨率。在无需触发和呼吸控制的心脏实时成像中，SENSE方法显著提高了时间分辨率，低至13毫秒（77帧/秒）。心脏实时SENSE在多种模式下得到了展示，包括以每秒25个三联帧的速率对三个平行层面进行实时成像。
