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目的:验证立体定向框架定位的误差。方法:采用国产的体部定位框架,STAR-2000型三维TPS系统。定位时用魔十字加以联合体部定位框架同时定位,CT扫描结束时在肿瘤中心层利用激光灯标出体表标记并记录对应定位框架Z轴坐标,与魔十字定位和立体定向框架定位的肿瘤中心层Z轴坐标比较,最后用胶片照相法检验靶中心坐标的误差。结果:立体定向框架定位的误差有时达10mm,魔十字定位误差在2-4mm,CT扫描激光灯标出肿瘤中心层Z轴坐标经胶片照相法检验误差在2mm.。联合定位误差一般在2mm内,可省去胶片验证。结论:立体定向框架定位时因多种原因影响,需与CT扫描激光灯标出肿瘤中心层Z轴坐标比较和校正。
Objective: To verify the positioning error of the stereotactic frame. Methods: The domestic body positioning frame, STAR-2000 three-dimensional TPS system. When positioning with the Magic Cross to the joint body positioning frame positioning at the same time, the end of the CT scan using laser light mark the surface of the body mark and record the corresponding positioning frame Z-axis coordinates, and the magic cross and stereotactic positioning of the tumor The center of the Z-axis coordinates of the comparison, the last test of the film center coordinates of the error. Results: The error of stereotactic frame positioning was up to 10mm at some time, and the error of magic cross was 2-4mm. The error of the Z-axis of the center layer of the tumor marked by CT scanning laser was 2mm. Joint positioning error is generally within 2mm, eliminating the need for film verification. CONCLUSION: The stereotactic frame should be positioned and corrected for a variety of reasons and need to be compared and corrected with the Z-axis coordinate of the tumor center marked by CT scanning laser light.