MR FLUOROSCOPY - TECHNICAL FEASIBILITY
MR FLUOROSCOPY - TECHNICAL FEASIBILITY
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DOI：
10.1002/mrm.1910080102
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发表时间：
1988-09-01
影响因子：
3.3
通讯作者：
HERFKENS, RJ
中科院分区：
文献类型：
--
作者：
RIEDERER, SJ;TASCIYAN, T;HERFKENS, RJ
描述了一种磁共振图像采集和重建的方法，其中允许高成像速率和快速重建时间。该采集是对基本FLASH序列的修改，但具有有限数量的N个相位编码。编码被顺序地、周期性地和连续地应用。通过沿着所采集的数据滑动宽度为N的窗口来形成图像，沿着所采集的数据进行编码，并且针对窗口的每个位置重建图像。通常，每个图像的采集时间超过连续图像之间的时间，并且该方法因此具有时间滞后。使用48个相位编码和20 ms TR的动态体模进行实验研究，图像采集时间约为1 s。重建序列中的图像显示速率为12.5个图像/s，图像序列描绘了体模的运动。其他研究用24种编码进行。它示出了滑动窗口技术如何适合于高速重建，每个新采集的回波用于快速更新显示器上的图像。所描述的采集技术和重建算法的硬件实现的组合可以导致实时MR图像采集和重建。
A method of magnetic resonance image acquisition and reconstruction is described in which high imaging rates and fast reconstruction times are allowed. The acquisition is a modification of the basic FLASH sequence but with a restricted number of N of phase encodings. The encodings are applied sequentially, periodically, and continuously. Images are formed by sliding a window of width N encodings along the acquired data and reconstructing an image for each position of the window. In general the acquisition time per image exceeds the time between between successive images, and the method thus has a temporal lag. Experimental studies were performed with a dynamic phantom using 48 phase encodings and a TR of 20 ms, for an image acquisition time of about 1 s. The image display rate in the reconstructed sequence was 12.5 images/s, and the image sequence portrayed the motion of the phantom. Additional studies were done with 24 encodings. It is shown how the sliding window technique lends itself to high-speed reconstruction, with each newly acquired echo used to quickly update the image on display. The combination of the acquisition technique described and a hardware implementation of the reconstruction algorithm can result in realtime MR image acquisition nad reconstruction.