Sage Jaime E, Samii Valerie F, Abramson Carley J, Green Eric M, Smith Mark, Dingus Cheryl
Department of Veterinary Clinical Sciences, College of Veterinary Medicine The Ohio State University, 601 Vernon L. Tharp Street, Columbus, OH 43210, USA.
Vet Radiol Ultrasound. 2006 May-Jun;47(3):249-53. doi: 10.1111/j.1740-8261.2006.00135.x.
T2-weighted fast spin echo and conventional spin echo are two magnetic resonance (MR) pulse sequences used to image the brain. Given the same scan parameters the resolution of fast spin-echo images will be inferior to that of conventional spin-echo images. However, fast spin-echo images can be acquired in a shorter time allowing scan parameters to be optimized for increased resolution without increasing the time to an unacceptable level. MR imaging of the brain of 54 dogs, suspected of having parenchymal brain abnormalities was performed using a 1.5 T scanner. Acquisition time ranged from 4 min 24 s to 7 min 16 s (average = 5 min 15 s) for fast spin-echo scans and from 6 min 32 s to 11 min 26s (average = 7 min 55s) for conventional spin-echo scans. All reviewers consistently rated the resolution of fast spin-echo images higher than the conventional spin-echo images (P = 0.000). The potential disadvantages of fast spin-echo acquisitions (motion artifacts, blurring, and increased hyperintensity of fat) did not affect the resolution of the images. Fast spin echo offers increased resolution in a comparable time to conventional spin echo by increased number of excitations and finer matrix size, thus improving the signal-to-noise ratio and spatial resolution, respectively.
T2加权快速自旋回波和传统自旋回波是用于脑部成像的两种磁共振（MR）脉冲序列。在相同的扫描参数下，快速自旋回波图像的分辨率将低于传统自旋回波图像。然而，快速自旋回波图像可以在更短的时间内采集，从而能够优化扫描参数以提高分辨率，而不会将时间增加到不可接受的水平。使用1.5T扫描仪对54只疑似患有实质性脑部异常的犬进行脑部MR成像。快速自旋回波扫描的采集时间为4分24秒至7分16秒（平均 = 5分15秒），传统自旋回波扫描的采集时间为6分32秒至11分26秒（平均 = 7分55秒）。所有 reviewers 一致认为快速自旋回波图像的分辨率高于传统自旋回波图像（P = 0.000）。快速自旋回波采集的潜在缺点（运动伪影、模糊和脂肪高信号增加）并未影响图像的分辨率。通过增加激发次数和更精细的矩阵大小，快速自旋回波在与传统自旋回波相当的时间内提供了更高的分辨率，从而分别提高了信噪比和空间分辨率。
