Analysis of using the ArcCHECK Diode Array for Verifying Tomotherapy HDATM Patient-specific Delivery Quality Assurance
Keywords:
ArcCHECK, Patient-specific QA, TomotherapyAbstract
Background: The ArcCHECK cylindrical diode array, which is real time analysis and reusable tool, has been introduced as a patient QA device for Tomotherapy plan.
Objective: The aim of this study was to investigate the dosimetric characteristics of ArcCHECK for Tomotherapy including the clinical usage as a dose verification tool.
Materials and Methods: The dosimetric characteristics of the ArcCHECK in terms of short-term reproducibility, dose linearity, field size dependence, including sensitivity of cylindrical diode array to variation of the Tomotherapy planning parameters i.e., field width (FW) and pitch were investigated. The clinical tests were used on twenty prostate cancers. The measured dose distributions using ArcCHECK and dose measurement from EBT3 films were compared with dose calculation from Tomotherapy treatment planning. The results were evaluated following the gamma criteria of 3%/3mm. The clinical action level was established by given a higher percentage of gamma passing than (100-CL) while CL was [(100-mean) + 1.96σ].
Results: The sensitivity of diode showed linearity with dose delivery in the range from 5s to 300s (R2=1) and the variations of repeatedly measured in the short-term period was within ±1.52%. The field size dependence exhibited the same response as the ionization chamber (CC13) except for 1 cm field width; the diodes exhibited 14.81% over-response when compared with the CC13, which may result from volume averaging of the CC13. The influence of planning parameters on sensitivity of ArcCHECK showed no difference of gamma passing rate with higher passing rate than 97% for all various FW and pitch plans. For clinical plans, ArcCHECK measurements demonstrated in the similar trend of EBT3 films analysis with a moderate positive correlation (r=0.59). The clinical action level of our institution was found 97% when using ArcCHECK as a verification tool.
Conclusion: The detector achieves the efficient dosimetric characteristics and ArcCHECK response is independent of Tomotherapy planning parameters. The percent gamma passing for patient-specific QA evaluation shows moderate positive correlation with the film. The ArcCHECK system can be considered as a reliable and an effective QA tool for patient verification of the Tomotherapy.
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