Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom.
J Magn Reson Imaging. 2012 Apr;35(4):969-75. doi: 10.1002/jmri.23528. Epub 2011 Dec 14.
To compare cross-sectional and in-plane coronary vessel wall imaging using a spiral readout at 1.5 and 3 Tesla (T).
Free-breathing coronary vessel wall imaging using a local inversion technique and spiral readout was implemented. Images were acquired in ten healthy adult subjects on a 3T clinical scanner using a 32-element cardiac coil and repeated on a 1.5T clinical scanner using a 5-element coil.
Cross-sectional and in-plane spiral vessel wall imaging was performed at both 1.5 and 3T. In cross-sectional images, artifact scores were superior at 1.5T (P < 0.05) but no significant difference was found in image quality scores compared with 3T. Image quality (P < 0.01) and artifact scores (P < 0.01) were found to be superior for in-plane images at 1.5T. Vessel wall sharpness in the in-plane orientation was also found to be higher at 1.5T (P < 0.03).
Although excellent in-plane coronary vessel wall images can be acquired at 3T, the overall robustness may be affected by off-resonance blurring due to increased B0 inhomogeneity compared with 1.5T.
比较 1.5T 和 3T 时使用螺旋读取进行的冠状动脉横截面和平面血管壁成像。
使用局部反转技术和螺旋读取实现了自由呼吸冠状动脉血管壁成像。在一台 3T 临床扫描仪上使用 32 元素心脏线圈和在一台 1.5T 临床扫描仪上使用 5 元素线圈在 10 名健康成年受试者中采集图像。
在 1.5T 和 3T 均进行了横截面和平面螺旋血管壁成像。在横截面图像中，1.5T 的伪影评分更优（P<0.05），但与 3T 相比，图像质量评分无显著差异。1.5T 的图像质量（P<0.01）和伪影评分（P<0.01）均优于平面图像。在平面方向上的血管壁锐利度也在 1.5T 时更高（P<0.03）。
尽管在 3T 时可以获得出色的冠状动脉血管壁平面图像，但与 1.5T 相比，由于 B0 不均匀性增加导致的离共振模糊可能会影响整体稳健性。
