摘要目的 探讨自制脚部固定器在下肢肿瘤等放疗中的应用价值.方法 31例患者下肢放疗时应用脚部固定器定位固定,放疗中每周拍摄验证片,通过验证片和模拟定位片或计划系统生成的数字重建影像比较分析摆位误差.配对t检验差异.结果 患者上下、前后、左右方向摆位误差分别为(2.39±2.21)、(0.22±2.73)、(0.20±2.71) rnm,上下方向偏移较前后、左右方向大(P=0.000、0.000).结论 下肢肿瘤等放疗中应用脚部固定器具有良好准确性和重复性,值得推广.

abstractsObjective To explore the value of a homemade foot-fixator in radiotherapy for lower extremity tumors.Methods Lower limbs of 31 patients were fixed by the foot-fixator during lower extremity radiotherapy.Verification images were taken every week during radiotherapy.Positioning error was analyzed by comparison between verification images and simulated positioning images or digitally reconstructed radiographs generated by the treatment planning system.The comparison was made by paired t-test.Results The positioning errors in the head-foot,anterior-posterior,and left-right directions were 2.39±2.21,0.22±2.73,and 0.20±2.71 mm,respectively.The positioning error in the head-foot direction was significantly larger than those in the anterior-posterior and left-right directions (P=0.000,0.000).Conclusions The homemade foot-fixator shows satisfactory accuracy and repeatability,which holds promise for wide application in radiotherapy for lower extremity tumors.