An evaluation of two-dimensional array ion chambers for patient-specific quality assurance of Tomotherapy HDATM
Keywords:
Helical Tomotherapy, Patient-Specific Quality Assurance, Two-dimensional array ion chambersAbstract
Background: The MatriXX is a 2D array base on ion chamber detector that provides real-time dose measurement and ease of use. However, there are few studies on MatriXX for patient-specific quality assurance (PSQA) of Tomotherapy.
Objective: The purpose of this study is to validate the MatriXX for using as a PSQA tool for Tomotherapy HDATM at Ramathibodi hospital.
Materials and Methods: The MatriXX dosimetric characteristics were evaluated in terms of dose linearity, distance dependence, and directional dependence including field width (FW), pitch, and modulation factor (MF) were examined by varying the parameter based on the clinical use. For the clinical application, the gamma analysis results of ten prostate plans by MatriXX were evaluated. The location of detector effect was evaluated by shifting the virtual planning target volume (PTV) and ten breast plans were investigated.
Results: The dose response was linear for delivery time of 5-300 seconds. Source-to-detector distance (SDD) effect showed a good agreement with A1SL with a difference less than 1%. The directional response was showed a large discrepancy (0.5) at the rear part of the detector, which was the effect of MatriXX structure. The gamma passing rate (GP) for all plans that optimized by varying planning parameter were greater than 97% for 3%/3mm criteria. For clinical test, the average GP of ten prostate plans was 98.29±0.82% which pass the criteria of AAPM TG-148. In addition, the GP for virtual PTV for a location effect test were greater than 96% for all six directions. The results indicated that location did not affect to the MatriXX measurement. However, for clinical breast cases, which were large field size and almost located in non-isocenter, the results showed a low GP (< 50%) for non-shifting the detector. It showed an increasing of average GP up to greater than 88% when shifting almost dose distributions to cover the whole effective detector area.
Conclusion: This study indicated that MatriXX was an effective and reliable dosimeter tool, and it could be used for PSQA. However, the use of MatriXX for PSQA in clinical cases with a large radiation field and non-isocenter should be concerned.
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