CyberKnife® fixed cone and Iris™ defined small radiation fields: Assessment with a high-resolution solid-state detector array

Journal of Applied Clinical Medical Physics
Giordano BiasiAnatoly B Rosenfeld

Abstract

The challenges of accurate dosimetry for stereotactic radiotherapy (SRT) with small unflattened radiation fields have been widely reported in the literature. In this case, suitable dosimeters would have to offer a submillimeter spatial resolution. The CyberKnife® (Accuray Inc., Sunnyvale, CA, USA) is an SRT-dedicated linear accelerator (linac), which can deliver treatments with submillimeter positional accuracy using circular fields. Beams are delivered with the desired field size using fixed cones, the InCise™ multileaf collimator or a dynamic variable-aperture Iris™ collimator. The latter, allowing for field sizes to be varied during treatment delivery, has the potential to decrease treatment time, but its reproducibility in terms of output factors (OFs) and dose profiles (DPs) needs to be verified. A 2D monolithic silicon array detector, the "Octa", was evaluated for dosimetric quality assurance (QA) for a CyberKnife system. OFs, DPs, percentage depth-dose (PDD) and tissue maximum ratio (TMR) were investigated, and results were benchmarked against the PTW SRS diode. Cross-plane, in-plane and 2 diagonal dose profiles were measured simultaneously with high spatial resolution (0.3 mm). Monte Carlo (MC) simulations with a GEANT4...Continue Reading

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Citations

Dec 10, 2019·Journal of Applied Clinical Medical Physics·Yuichi AkinoToshijiro Yamamoto
Jul 1, 2020·Physics in Medicine and Biology·Anatoly B RozenfeldVladimir Feygelman
Oct 15, 2019·Journal of Applied Clinical Medical Physics·Kananan UtitsarnAnatoly B Rosenfeld

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Software Mentioned

GEANT4
Octa
ArcCHECK
MATLAB
GEANT4 GEometry ANd Tracking

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