Turetschek K, Wunderbaldinger P, Bankier A A, Zontsich T, Graf O, Mallek R, Hittmair K
Department of Radiology, University of Vienna, AKH, Austria.
Magn Reson Imaging. 1998;16(2):127-35. doi: 10.1016/s0730-725x(97)00254-3.
The purpose of this study was to evaluate the diagnostic efficacy of the double inversion recovery fast spin echo (DIR-FSE) sequence for brain imaging compared to the fluid-attenuated inversion recovery (FLAIR) sequence. DIR-FSE and FLAIR-FSE sequences were obtained and compared side by side. Image assessment criteria included lesion conspicuity, contrast between different types of normal tissue, image quality, and artifacts. In addition, contrast ratios and contrast-to-noise ratios were determined. Scan time of DIR-FSE was 33% longer than scan time of FLAIR-FSE. Overall lesion conspicuity was equal on DIR-FSE and FLAIR-FSE; however, DIR-FSE showed particular advantages for infratentorial lesions and lesions with only poor contrast on T2-weighted images, whereas FLAIR was slightly superior for small superficial cerebral abnormalities. Gray-white differentiation was better with DIR-FSE. Cerebrospinal fluid suppression was equal on both sequences; cerebrospinal fluid pulsation artifacts were more pronounced on DIR-FSE but did not cause diagnostic difficulties on these images. We conclude that DIR-FSE might be obtained if infratentorial lesions and abnormalities with only slightly prolonged T2 relaxation times are suspected. Otherwise, FLAIR-FSE seems preferable.
本研究的目的是评估与液体衰减反转恢复（FLAIR）序列相比，双反转恢复快速自旋回波（DIR-FSE）序列在脑成像中的诊断效能。获取DIR-FSE和FLAIR-FSE序列并进行并排比较。图像评估标准包括病变的清晰度、不同类型正常组织之间的对比度、图像质量和伪影。此外，还测定了对比率和对比噪声比。DIR-FSE的扫描时间比FLAIR-FSE的扫描时间长33%。在DIR-FSE和FLAIR-FSE上，总体病变清晰度相同；然而，DIR-FSE对幕下病变和在T2加权图像上对比度仅较差的病变具有特殊优势，而FLAIR对小的浅表脑异常略具优势。DIR-FSE的灰白质区分更好。两个序列的脑脊液抑制效果相同；DIR-FSE上脑脊液搏动伪影更明显，但在这些图像上并未造成诊断困难。我们得出结论，如果怀疑有幕下病变和T2弛豫时间仅略有延长的异常情况，可能需要采用DIR-FSE。否则，FLAIR-FSE似乎更可取。
