High Signal Intensity on T1-Weighted MR Image Related to Vacuum Cleft in the Intervertebral Disk: Clinical and Phantom Study
High Signal Intensity on T1-Weighted MR Image Related to Vacuum Cleft in the Intervertebral Disk: Clinical and Phantom Study
复制标题
与椎间盘真空裂相关的 T1 加权 MR 图像的高信号强度：临床和模型研究
DOI：
10.3348/jkrs.2000.43.6.651
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发表时间：
2000
影响因子：
--
通讯作者：
K. Suh
中科院分区：
文献类型：
--
作者：
Tae Gyun Chung;Y. S. Kim;Yongmin Chang;Sang Kwon Lee;Young Hwan Kim;H. K. Ryeom;Jongmin Lee;Chang Hyon Lee;Tae Hun Kim;K. Suh
目的：探讨腰椎间盘真空裂隙附近T1加权像上出现高信号区的可能机制。材料和方法：我们分析了9例患者的14个椎间盘，在这些患者中观察到了具有T1高信号的真空裂隙。使用1.5T全身成像仪，病变范围从T11-12至L5-S1，获得矢状位脊柱回波T1加权像和梯度回波像(翻转角分别为20和60)。所有患者均行X线平片检查，2例行CT扫描，以明确真空裂的位置。设计了一种含有空隙的3%琼脂凝胶块形成磁化率差的模体。空气空间厚1.6 mm，宽25 mm，深度20-25 mm，间距1.6 mm。结果：所有病例均经X线平片和CT扫描证实为真空裂。在含有空气的水平，T1加权图像(包括自旋回波和梯度回波)显示椎间盘真空裂隙所致的信号空洞。然而，在真空裂隙附近观察到了一条高信号带。翻转角度为60的梯度回波图像显示的信号强度比翻转角度为20的图像更亮。我们的幻影研究得出了同样的结果。结论：磁化率伪影可能是腰椎间盘真空裂隙附近出现高T1信号的原因。此外，为了产生信号超强度，干燥盘材料必须含有一定量的水分子。
Purpose: To determine the possible mechanism by which an area of high signal intensity appears on T1-weighted MR images adjacent to a vacuum cleft in intervertebral disks. Materials and Methods: We analyzed a total of 14 disks in nine patients in whom a vacuum cleft with T1-signal hyperintensity was observed. Lesions were present from T11-12 to L5-S1 using a 1.5-T whole-body imager, sagittal spine-echo T1-weighted and gradient-echo images (flip angle, 20 and 60) were obtained. In order to identify the vacuum cleft, using plain radiographs in all patients and CT scans in two were also ob-tained. A 3% agar-gel block containing empty slits to form a magnetic susceptibility difference, a phantom was designed. The air spaces were 1.6 mm in thickness, 25 mm in width, and 20 to 25 mm in depth with 1.6-mm spacing. Results: In all patients, vacuum clefts were confirmed by plain radiographs and CT scans. At the level containing air, T1-weighted images (both spin-echo and gradient-echo) showed a signal void resulting from the intervertebral disk vacuum cleft. A hyperintense band adjacent to the vacuum cleft was, however, observed. A gradient-echo image with a 60 flip angle showed a brighter signal intensity than one with a 20 angle. Our phantom study gave the same results. Conclusion: The magnetic susceptibility artifact may be responsible for the T1-signal hyperintensity observed adjacent to the vacuum cleft in intervertebral disks. In addition, in order to generate signal hyperintensity, the desiccating disk material must contain a certain amount of water molecules.