RapidArc Verification Measurements using Three Different Dosimetric Systems

Monte Carlo based, patient‐specific RapidArc QA using Linac log files

“…For all plans, good agreement was observed between Rapi-dArc TPS and all types of MC dose distributions with gamma values below 1 in Ͼ95% of the points considered. The results are shown in table III and are in agreement with Korreman et al 6 An example of the output from the 3D gamma test is shown in Fig. 7.…”

“…6 Table III shows similar results for all types of MC calculated dose distributions. This highlights again the accuracy of our method and the machine perfor-FIG.…”

“…These criteria were chosen for comparison purposes with a study assessing the RapidArc delivery accuracy using three different dosimetric systems. 6 In this section the Rapi-dArc TPS plan was used as the reference dose distribution. For all plans, good agreement was observed between Rapi-dArc TPS and all types of MC dose distributions with gamma values below 1 in Ͼ95% of the points considered.…”

“…A commissioning and QA protocol for RA was recently proposed by Ling et al 5 However, few beam delivery accuracy studies have been reported 3, 6 to date. Those studies that have been reported used 2D film dosimetry or diode arrays.…”

“…Those studies that have been reported used 2D film dosimetry or diode arrays. Using three different dosimetric systems ͑IBA IMRT Ma-triXX with MULTICube, PTW 2D-ARRAY seven29 with OCTAVIUS, and Scandidos Delta4͒, Korreman et al 6 demonstrated the consistency and accuracy of RapidArc treatment delivery with gamma values ͓acceptance criteria of 3% / 3 mm distance to agreement ͑DTA͔͒ below 1 in over 90% of the measured points. Limitations of such experimental devices include a lack of dosimetric accuracy for film dosimetry and spatial resolution issues for 2D arrays of di-odes.…”