Baudouin C J, Ward J, Ridgway J P, Robinson P J
Department of Clinical Radiology, St James's University Hospital, Leeds, UK.
Clin Radiol. 1996 Nov;51(11):769-74. doi: 10.1016/s0009-9260(96)80004-3.
Conventional and fast T2-weighted spin-echo scans obtained at 1.0T were compared in 29 patients undergoing magnetic resonance imaging of the liver, 25 of whom had focal liver lesions. Conventional spin-echo (CSE) detected 49 of 50 lesions (98%), fast spin-echo (FSE) 45 of 50 lesions (90%). Qualitative assessment of lesion conspicuity, artefact level, and overall image quality by two radiologists showed conventional spin-echo was preferred to fast spin-echo. Lesion conspicuity was graded moderate or good in 84% of lesions on CSE compared to 73% on FSE. Artefact level was higher on FSE in 34%, equal in 61% and higher on CSE in 5%. Overall, CSE was preferred to FSE in 76% of cases. Mean lesion to liver contrast to noise ratio was significantly higher on conventional spin-echo than fast spin-echo: CSE mean 5.9, FSE mean 4.9 P < 0.05. This difference in contrast to noise ratio remained for malignant lesions, but no significant difference was present for cysts and haemangiomas. We advise careful assessment of new sequences before conventional T2-weighted spin-echo is replaced by fast T2-weighted spin-echo in the detection of focal liver lesions.
对29例接受肝脏磁共振成像检查的患者进行了比较，他们均接受了1.0T场强下的常规及快速T2加权自旋回波扫描，其中25例有肝脏局灶性病变。常规自旋回波（CSE）检测出50个病变中的49个（98%），快速自旋回波（FSE）检测出50个病变中的45个（90%）。两位放射科医生对病变清晰度、伪影水平及整体图像质量进行的定性评估显示，常规自旋回波优于快速自旋回波。CSE上84%的病变的清晰度分级为中等或良好，而FSE上为73%。FSE的伪影水平在34%的情况下更高，61%的情况下与CSE相等，5%的情况下CSE的伪影水平更高。总体而言，76%的病例中CSE优于FSE。常规自旋回波上病变与肝脏的平均对比噪声比显著高于快速自旋回波：CSE平均为5.9，FSE平均为4.9，P<0.05。恶性病变的对比噪声比存在这种差异，但囊肿和血管瘤不存在显著差异。我们建议在检测肝脏局灶性病变时，在用快速T2加权自旋回波取代常规T2加权自旋回波之前，仔细评估新序列。
