Farzaneh F, Riederer S J, Djang W T, Curnes J T, Herfkens R J
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
Radiology. 1988 May;167(2):541-6. doi: 10.1148/radiology.167.2.3357969.
A magnetic resonance imaging pulse sequence was developed in which multisection spin-echo image data are simultaneously acquired for two repetition time (TR) intervals (TR1 and TR2) in one imaging sequence. In a conventional multisection image at a single TR, the number of sections is limited to TR/TS, where TS is the readout time. With this new sequence, the number of sections that can be imaged at both TRs in one acquisition is equal to (TR1 + TR2)/(TS1 + TS2), where TS1 and TS2 may be different for the two TRs. Imaging time is equal to that for a single image at a TR of TR1 + TR2. Clinical images were obtained with the new sequence from 15 patients and compared with images acquired at the same TR/TE by means of standard multisection single-TR methods. Relative image quality was assessed by three radiologists in 37 comparisons. In general, the dual-TR results at the long TR were judged equivalent to those from a single-TR image. Dual-TR results at the short TR had a modest reduction in contrast, but in none of 15 cases were any pathologic features missed.
开发了一种磁共振成像脉冲序列，在该序列中，在一个成像序列的两个重复时间（TR）间隔（TR1和TR2）内同时采集多层面自旋回波图像数据。在单个TR的传统多层面图像中，层面数限制为TR/TS，其中TS是读出时间。使用这种新序列，一次采集中在两个TR下都能成像的层面数等于（TR1 + TR2）/（TS1 + TS2），其中两个TR的TS1和TS2可能不同。成像时间等于TR为TR1 + TR2时单幅图像的成像时间。用新序列对15例患者进行临床成像，并与通过标准多层面单TR方法在相同TR/TE下采集的图像进行比较。三位放射科医生在37次比较中评估了相对图像质量。一般来说，长TR时的双TR结果被判定与单TR图像的结果相当。短TR时的双TR结果对比度略有降低，但在15例病例中均未漏诊任何病理特征。
