半側顔面痙攣の MRI による検査法

概要

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In cases with hemifacial spasm conventional MRI scanned by coronal or axial image has been limited to the visualization of large vessels compressing the facial nerve. We therefore examined an oblique sagittal (OS) imaging method which was developed to provide better visualization process of vascular compression of nerves. Our OS views were scanned along the nerve identified by the axial view, which was scanned at 105° to the lines along the dorsal brain stem and the pontomedullary junction. The axial plane, scanned at 105° to this baseline, permits the facial nerve to be clearly delineated in a high percentage of cases. The OS gradient echo was utilized to understand the most clearly visualized compression of the nerve as high intensity line, even if the compressing vessel was smaller than those of the shown previously. This technique also made it easier to visualize the locations and directional of vessels, which compresses the nerves. By studying the slice directions and imaging parameters and setting the baseline, we have improved the accuracy of MRI examinations using our method which provides effective preoperative data for hemifacial spasm.
社団法人日本放射線技術学会の論文
1992-12-01