Darkazanli A, Hynynen K, Unger E C, Schenck J F
Department of Radiology, University of Arizona Health Sciences Center, Tucson 85724.
J Magn Reson Imaging. 1993 May-Jun;3(3):509-14. doi: 10.1002/jmri.1880030313.
Ultrasonic surgery was performed in rabbits and dogs under the guidance of magnetic resonance (MR) imaging. Two different MR techniques were used to guide the ultrasound beam. T2-weighted images showed lesion formation within a few minutes after sonication. T1-weighted GRASS (gradient-recalled acquisition in the steady state) images were sensitive to temperature elevations, permitting monitoring of lesion creation with MR imaging. Short TR T1-weighted GRASS images were not as helpful in detecting temperature elevation because of a reduction in signal-to-noise ratio. T2-weighted fast spin-echo images were compared with conventional T2-weighted spin-echo images. The former produced high-quality images in a fraction of the imaging time. This study shows that it is possible to monitor and guide ultrasonic surgery with MR imaging.
在磁共振（MR）成像引导下，对兔和犬进行了超声手术。使用了两种不同的MR技术来引导超声束。T2加权图像显示在超声处理后几分钟内形成病变。T1加权GRASS（稳态梯度回波采集）图像对温度升高敏感，允许用MR成像监测病变的形成。短TR T1加权GRASS图像由于信噪比降低，在检测温度升高方面不太有用。将T2加权快速自旋回波图像与传统的T2加权自旋回波图像进行了比较。前者在成像时间的一小部分内产生了高质量的图像。本研究表明，用MR成像监测和引导超声手术是可行的。
