Yoda K, Nakagawa K, Shiraishi K, Okano Y, Ohtomo K, Pellegrini R G
Department of Radiology, University of Tokyo Hospital, Tokyo, Japan.
Br J Radiol. 2009 Apr;82(976):328-31. doi: 10.1259/bjr/13535955. Epub 2008 Dec 8.
Dose verification of intensity-modulated arc therapy using an ERGO++ treatment planning system and Elekta internal multileaf collimators is described. Prostate intensity-modulated arc therapy was planned using the arc modulation optimization algorithm inverse planning module of ERGO++. After transferring the plan to Elekta Synergy's controller (Elekta Ltd, Crawley, UK), the isocentre dose was measured and compared with a calculated dose using a pinpoint chamber and a water phantom in a cylindrical acrylic enclosure. Subsequently, an EDR2 film was placed inside a multilayer plastic phantom, and total dose distributions were measured in three axial planes as well as in the coronal and sagittal planes to compare the actual dose with the calculated dose. The dose discrepancy at the isocentre was 1.7%. The calculated gamma indices were less than 1 over 90% of the three axial planes, as well as in the coronal and sagittal planes, having a dose greater than 50% of the maximum target dose.
描述了使用ERGO++治疗计划系统和医科达内部多叶准直器对调强弧形治疗进行剂量验证的情况。使用ERGO++的弧形调制优化算法逆向计划模块对前列腺调强弧形治疗进行计划。将计划传输到医科达Synergy的控制器（医科达有限公司，英国克劳利）后，使用针点电离室和置于圆柱形丙烯酸外壳中的水模体测量等中心剂量，并与计算剂量进行比较。随后，将一张EDR2胶片放置在多层塑料模体内，在三个轴向平面以及冠状面和矢状面测量总剂量分布，以比较实际剂量与计算剂量。等中心处的剂量差异为1.7%。在三个轴向平面以及冠状面和矢状面中，超过90%的剂量大于最大靶剂量50%的区域，计算得到的伽马指数小于1。
