Method CT scanner frame incline to the head. The position line and Lumbar Isthmus are parallel to each other. The Angle of scanning are opposite to the intervertebral discs level.
方法CT扫描架向头侧倾斜，定位线与腰椎峡部平面平行，扫描角度与间盘层面相反。
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Results Insertion site is better at the exterior aspect of the horigontal line of intervertebral facet joints in coronal, while in oblique and sagittal plane, 1-3mm furthor outward.