Shea Steven M, Deshpande Vibhas S, Chung Yiu-Cho, Li Debiao
Department of Radiology, Northwestern University, Chicago, Illinois, USA.
J Magn Reson Imaging. 2002 May;15(5):597-602. doi: 10.1002/jmri.10106.
To evaluate the effectiveness of a T2-magnetization preparation scheme for improving coronary artery imaging with true fast imaging with steady-state precession (True-FISP).
Simulations were performed to compare the blood-myocardium signal difference with no T2-preparation to that with various T2-preparation times (24, 40, and 60 msec) using an electrocardiogram (ECG)-triggered, segmented True-FISP acquisition. Seven volunteers were imaged to evaluate the effectiveness of T2-preparation for coronary artery delineation using True- FISP and to optimize the T2-preparation time.
Simulations showed that T2-preparation improved the signal difference between blood and myocardium over that without T2-preparation. The optimal T2- preparation time was determined to be 40 msec. In volunteer studies, a T2- preparation time of 40 msec provided a significant improvement in contrast- to-noise ratio (CNR) between the coronary arteries and myocardium over that without T2-preparation. It also showed a significant improvement in visualizing the distal portions of the coronary arteries.
T2-preparation improves coronary artery delineation with True-FISP.
评估一种T2磁化准备方案在通过稳态进动真快速成像（True-FISP）改善冠状动脉成像方面的有效性。
使用心电图（ECG）触发的分段True-FISP采集，进行模拟以比较无T2准备时与不同T2准备时间（24、40和60毫秒）时血液-心肌信号差异。对7名志愿者进行成像，以评估使用True-FISP时T2准备对冠状动脉描绘的有效性，并优化T2准备时间。
模拟显示，T2准备比无T2准备时改善了血液与心肌之间的信号差异。确定最佳T2准备时间为40毫秒。在志愿者研究中，40毫秒的T2准备时间与无T2准备相比，显著提高了冠状动脉与心肌之间的对比度噪声比（CNR）。它在可视化冠状动脉远端部分方面也有显著改善。
T2准备可通过True-FISP改善冠状动脉描绘。
