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目的利用头颈部、肺部和仿真人模体检测射波刀影像引导摆位(IGRT)治疗脊柱追踪精度并进行评估。方法利用CT分别扫描装有胶片的头颈部、肺部和仿真人模体,将影像数据传输至Multi Plan治疗计划系统中。设计颈椎、胸椎、腰椎、尾椎、股骨追踪的模体计划,等中心计划,70%剂量曲线给予420 c Gy。模体置于治疗床上,执行模体计划。扫描照射后的胶片,利用端到端测试(E2E)软件分析照射精度。结果颈椎追踪的精度为0.54 mm和0.68 mm,胸椎为0.50 mm和0.65 mm,腰椎、骶椎、髂骨和股骨分别为0.70、1.99、2.21、2.05 mm。结论对于这3种静态模体,颈椎、胸椎和腰椎的追踪精度均达到亚毫米,骶椎、髂骨和股骨精度为(2.00±0.21)mm,脊柱追踪的精度非常高。
OBJECTIVE: To assess and evaluate the accuracy of spinal tracking using IGRT with head and neck, lungs and simulated phantom. Methods The CT images of head and neck, lungs and artificial phantom were respectively scanned by CT to transfer the image data to the Multi Plan treatment planning system. Designing a phantom plan for cervical, thoracic, lumbar, caudal, and femur tracking, the isocenter plans to deliver a dose of 420 c Gy on a 70% dose curve. The phantom placed in the treatment bed, the implementation of phantom plan. The irradiated film was scanned and analyzed for end-to-end testing (E2E) software for accuracy. Results The accuracy of cervical spine tracking was 0.54 mm and 0.68 mm respectively. The thoracic spine was 0.50 mm and 0.65 mm. The lumbar, sacral, iliac and femoral fractures were 0.70, 1.99, 2.21 and 2.05 mm respectively. Conclusion The tracking accuracy of cervical, thoracic and lumbar vertebrae reached submillimeters with accuracy of (2.00 ± 0.21) mm for sacral, iliac and femur, and the accuracy of spinal tracing was very high.