Patel M R, Klufas R A, Alberico R A, Edelman R R
Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Mass 02115, USA.
AJNR Am J Neuroradiol. 1997 Oct;18(9):1635-40.
To compare an ultrafast T2-weighted (half-Fourier acquisition single-shot turbo spin-echo [HASTE]) pulse sequence with fast spin-echo T2-weighted sequences in MR imaging of brain lesions.
Fast spin-echo and HASTE images of 34 consecutive patients over the age of 50 years or with suspected demyelinating disease were reviewed independently by two neuroradiologists for the number of lesions less than 5 mm and greater than or equal to 5 mm, and for lesion conspicuity, gray-white matter differentiation, and extent of periventricular confluent signal abnormality. The reviewers also assessed for the presence of hemosiderin and extent of motion artifacts.
Per patient, the mean number of 5-mm or larger lesions detected on fast spin-echo images (1.4) relative to the number detected on HASTE images (0.8) was not statistically significant. For lesions less than 5 mm, fast spin-echo images showed more lesions (7.5) than HASTE images did (2.4). The fast spin-echo images were better at depicting gray-white matter differentiation, conspicuity of lesions, and periventricular signal abnormality. Of four T2 hypointense lesions seen on fast spin-echo images, none was detected on HASTE images.
Although the HASTE technique might be useful for rapid imaging of the brain, our study shows a diminished sensitivity for the detection of lesions less than 5 mm in diameter and for T2 hypointense lesions.
在脑病变的磁共振成像中，比较超快T2加权（半傅里叶采集单次激发快速自旋回波[HASTE]）脉冲序列和快速自旋回波T2加权序列。
由两名神经放射科医生独立回顾34例年龄超过50岁或疑似脱髓鞘疾病患者的快速自旋回波和HASTE图像，以统计直径小于5mm和大于或等于5mm的病变数量，评估病变的清晰度、灰白质区分以及脑室周围融合信号异常的范围。 reviewers还评估了含铁血黄素的存在情况和运动伪影的程度。
每位患者在快速自旋回波图像上检测到的5mm或更大病变的平均数量（1.4个）相对于HASTE图像上检测到的数量（0.8个）无统计学意义。对于小于5mm的病变，快速自旋回波图像显示的病变（7.5个）比HASTE图像（2.4个）更多。快速自旋回波图像在描绘灰白质区分、病变清晰度和脑室周围信号异常方面表现更好。在快速自旋回波图像上看到的4个T2低信号病变，在HASTE图像上均未检测到。
尽管HASTE技术可能有助于脑部的快速成像，但我们的研究表明，其对直径小于5mm的病变和T2低信号病变的检测敏感性降低。
