Department of Radiology, Utah Center for Advanced Imaging Research, University of Utah, Salt Lake City, Utah, USA.
Magn Reson Med. 2011 Nov;66(5):1286-92. doi: 10.1002/mrm.22909. Epub 2011 Jun 23.
High-resolution turbo spin echo (TSE) images have demonstrated important details of carotid artery morphology; however, it is evident that pulsatile blood and wall motion related to the cardiac cycle are still significant sources of image degradation. Although ECG gating can reduce artifacts due to cardiac-induced pulsations, gating is rarely used because it lengthens the acquisition time and can cause image degradation due to nonconstant repetition time. This work introduces a relatively simple method of converting a conventional TSE acquisition into a retrospectively ECG-correlated cineTSE sequence. The cineTSE sequence generates a full sequence of ECG-correlated images at each slice location throughout the cardiac cycle in the same scan time that is conventionally used by standard TSE sequences to produce a single image at each slice location. The cineTSE images exhibit reduced pulsatile artifacts associated with a gated sequence but without the increased scan time or associated nonconstant repetition time effects.
高分辨率涡轮自旋回波(TSE)图像已经展示了颈动脉形态的重要细节;然而,显然与心动周期相关的搏动性血液和管壁运动仍然是图像退化的重要来源。虽然心电图门控可以减少由于心脏搏动引起的伪影,但很少使用门控,因为它会延长采集时间,并且由于重复时间不恒定,可能会导致图像退化。本工作介绍了一种将常规 TSE 采集转换为回顾性 ECG 相关电影 TSE 序列的相对简单的方法。电影 TSE 序列在每个扫描时间内生成整个心动周期内每个切片位置的 ECG 相关图像,而标准 TSE 序列通常在每个切片位置生成单个图像。电影 TSE 图像显示出与门控序列相关的搏动性伪影减少,但没有增加扫描时间或相关的重复时间不恒定的影响。