Tsurushima H, Meguro K, Wada M, Narushima K, Nagotomo Y, Suzuki K, Nakai K, Yoshii Y, Nose T
Department of Neurosurgery, Tsukuba Medical Center Hospital.
No Shinkei Geka. 1996 Oct;24(10):891-5.
FLAIR (fluid-attenuated inversion recovery) images are MR images obtained with an inversion recovery sequence, which has a long inversion time (TI) and a long echo time (TE). We examined 29 cases (49 graphics) of cerebral contusion, 11 cases (22 graphics) of diffuse axonal injury (DAI) and 11 cases (11 graphics) of traumatic subarachnoid hemorrhage (t-SAH) with FLAIR sequence consisting of a repetitive time (TR) of 6500 msec, TI of 1700 msec and TE of 110 msec, and these graphics were compared with T2-weighted images by spin-echo sequence (TR 2500 msec, TE 90 msec) and computed tomographic (CT) scans. Some lesions of DAI were demonstrated more clearly with FLAIR images than with conventional T2-weighted images. Although contusion could be detected with FLAIR images as well as with conventional T2-weighted images, lesions adjacent to cerebral sulci were better delineated with FLAIR images. Because the cerebrospinal fluid signals in cerebral sulci were low-intensity, FLAIR images were useful in detecting lesions of the cerebral cortex adjacent to cerebral sulci. Although it has been reported that detection of SAH is difficult with standard T1- and T2-weighted images, the presence of t-SAH could be confirmed with FLAIR images as seen in CT scans.
液体衰减反转恢复（FLAIR）图像是通过具有长反转时间（TI）和长回波时间（TE）的反转恢复序列获得的磁共振图像。我们使用重复时间（TR）为6500毫秒、TI为1700毫秒、TE为110毫秒的FLAIR序列检查了29例（49幅图像）脑挫伤、11例（22幅图像）弥漫性轴索损伤（DAI）和11例（11幅图像）创伤性蛛网膜下腔出血（t-SAH），并将这些图像与自旋回波序列（TR 2500毫秒、TE 90毫秒）的T2加权图像以及计算机断层扫描（CT）进行比较。与传统的T2加权图像相比，FLAIR图像能更清晰地显示一些DAI病变。虽然FLAIR图像和传统的T2加权图像都能检测到挫伤，但FLAIR图像能更好地勾勒出脑沟附近的病变。由于脑沟中的脑脊液信号为低强度，FLAIR图像有助于检测脑沟附近的大脑皮质病变。虽然有报道称标准的T1加权和T2加权图像难以检测到SAH，但FLAIR图像可以像CT扫描一样确认t-SAH的存在。
