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Evaluation and Comparison of Second-Check Monitor Unit Calculation Software with Pinnacle Treatment Planning System

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B Tuazon

B Tuazon1*, G Narayanasamy1 , N Kirby1 , P Mavroidis2 , N Papanikolaou1 , S Stathakis1 , (1) University of Texas Health Science Center at San Antonio, TX, (2) University of North Carolina, Chapel Hill, NC


SU-E-T-372 (Sunday, July 12, 2015) 3:00 PM - 6:00 PM Room: Exhibit Hall

The purpose of this study was to evaluate and compare the accuracy of dose calculation algorithms in the second check software programs Radcalc, Diamond, IMSure, and MUcheck, against the Pinnacle3 treatment planning system (TPS).

Baseline accuracy of the second check software was established by comparison against Pinnacle TPS data using open square fields of 5, 10, 20, 30 and 40cm in a SAD setup. 18 previously treated patients’ files were exported from the Pinnacle3 TPS to each of the four second check softwares, consisting of 146 step and shoot intensity modulated radiotherapy (IMRT) beams and 60 Smart Arcs. Monitor unit (MU) calculated in each of the software were compared with the TPS and the values were represented as a percent difference. Open fields were calculated as a baseline for each software’s accuracy using 5x5, 10x10, 20x20, 30x30, and 40x40 fields. Box plots, Pearson correlation, and Bland-Altman analysis were used for comparison of the results.

The baseline accuracy was established to within 0.6%, -1.4%, -0.2%, and -1.0% for Diamond, IMSure,
MUcheck, and Radcalc, respectively. In the clinical data, the dose difference represented as mean ± 1
standard deviation were 0.7%±0.1%, -0.3%±0.1%, -1.5%±0.1%, and 0.4%±0.0% for Diamond, IMSure,
MUcheck, and Radcalc, respectively

The implementation of Clarkson algorithm for the dose calculation between each of the software in question can vary considerably. The currently used second check software, Radcalc has shown the best agreement on average, variance, and smallest percent range from Pinnacle3 TPS values. The closest in average percent difference from the TPS data was the IMSure software, but has significantly larger variance and percent range. The mean percent differences in Diamond and MUcheck were significantly larger than Radcalc and IMSure.

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