Pelagade S M, Paliwal B R
Department of Medical Physics, The Gujarat Cancer & Research Institute, NCH Campus, Asarwa, Ahmedabad-380016, India.
J Med Phys. 2009 Jul;34(3):188-90. doi: 10.4103/0971-6203.54856.
Seventy-one patient-specific delivery quality assurance (DQA) plans for the Tomotherapy HI-ART II helical tomotherapy system (TomoTherapy, Inc., Madison, WI, USA) were measured using film and ion chamber. The agreement in absolute point dose was 1.19 +/- 0.79%, 1.91 +/- 1.39%, 2.14 +/- 1.3%, 1.3 +/- 0.73% and 1.67 +/- 1.5% for head and neck, prostate, pelvis-abdomen sites, and for all other sites. The spatial agreement between the calculated and the measured film dose distributions was evaluated using the gamma metric distribution. The average frequency versus gamma interval was plotted as a bar graph to quantify the gamma index variation inside the region of interest for each body site.
使用胶片和电离室对71个针对患者的螺旋断层放射治疗系统Tomotherapy HI-ART II（美国威斯康星州麦迪逊市的Tomotherapy公司）的剂量递送质量保证（DQA）计划进行了测量。头颈部、前列腺、盆腔-腹部部位以及所有其他部位的绝对点剂量一致性分别为1.19±0.79%、1.91±1.39%、2.14±1.3%、1.3±0.73%和1.67±1.5%。使用γ指标分布评估计算的和测量的胶片剂量分布之间的空间一致性。将平均频率与γ间隔绘制成柱状图，以量化每个身体部位感兴趣区域内的γ指数变化。
