立体定向体部放疗肿瘤金标追踪数量及影响因素分析

目的 分析射波刀立体定向体部放疗(SBRT)腹部肿瘤金标追踪数量及影响因素。
方法 选取利用金标追踪的 254例腹部肿瘤患者资料,分别统计<3个和≥3个金标追踪资料,分析造成金标数量<3个的原因。
结果 254例患者中植入数量与显示数量相等的 22例;不相等的 232例,其中显示<3个的 49例(21.1%),≥3个的 183例(78.9%)。显示<3个金标追踪的49 例患者中 9 例金标移位、1例金标无法识别、23例植入质量不合格、16例刚性误差超过阈值。
结论 78.9% 患者达到了≥3个金标追踪要求,而不合格原因主要是金标植入数量不足、质量不合格和刚性误差超阈值。

Analysis of number of fiducial and infective factors for tracking tumor with stereotactic body radiation therapy

Objective To analyze the factors influencing fiducial number used for tracking abdominal tumor with stereotactic body radiation therapy (SBRT), which was implemented by CyberKnife.
Methods 254 abdominal tumor patients chosen which adopted fiducial tracking and classified the fiducials. We gathered data of the patients with<3 fiducials used for tracking and patients with ≥3 fiducials respectively, and analyzed the reason why<3 fiducials were left for tracking.
Results Among 254 patients,22 patients were showed that the number of fiducial implantation were equal to play number of fiducial;232 patients with no equation which 49 patients (21.1%) used<3 fiducials for tracking, 183 patients (78.9%) used ≥3 fiducials for tracking. Among the 49 patients with<3 fiducials for tracking, 9 patients had fiducials migrated, 1 patient had an unrecognizable fiducial, 23 patients had the implantation not qualified for tracking, and 16 patients had the rigid error surpassing the threshold.
Conclusions 78.9% patients were implanted ≥3 fiducials and thus qualified for fiducial tracking. Major reasons of disqualification include insufficient implanted fiducials, unqualified implantation and rigid error surpassing the threshold.