Abstract
The high spatial and temporal resolution 2D monolithic silicon detector arrays M512 and DUO for quality assurance (QA) in real time motion adaptive radiotherapy (ART) have been developed. The DUO array possesses a spatial resolution of 0.2 mm and has demonstrated agreement within 5% with EBT3 film measurements of 6MV linac beam profiles for field sizes 1 × 1 cm2 and SRS cone diameter 0.5 cm. Dynamic characterisation of the M512 for QA in real time ART evaluated the performance of M512 for small fields while the detector experiences periodic motion. It was demonstrated with M512 that MLC tracking with Calypso electromagnetic array compensates for the periodic motion and improves the agreement between static and dynamic beam profiles for field size 1 × 1 cm2 from within 75% in the penumbra to within 11% agreement. The dynamic profile is returned to a similar distribution as the static case.
Highlights
Stereotactic Radiotherapy (SRT) describes a form of external beam radiotherapy (EBRT) treatment delivering a hypo-fractionated high dose regimen using highly conformal photon beams
Dynamic characterisation of the MagicPlate 512 (M512) for quality assurance (QA) in real time adaptive radiotherapy (ART) evaluated the performance of M512 for small fields while the detector experiences periodic motion
It was demonstrated with M512 that Multi-Leaf Collimator (MLC) tracking with Calypso electromagnetic array compensates for the periodic motion and improves the agreement between static and dynamic beam profiles for field size 1 × 1 cm2 from within 75% in the penumbra to within 11% agreement
Summary
Stereotactic Radiotherapy (SRT) describes a form of external beam radiotherapy (EBRT) treatment delivering a hypo-fractionated high dose regimen using highly conformal photon beams. SBRT requires accurate delineation of the target structure and minimisation of treatment margins associated with physical, biological and physiological tumour processes and motions, to spare surrounding healthy tissue and nearby critical organs [3]. The treatment of small volume tumours in the vicinity of critical organs within the abdomen requires conformal small area radiation beams [4, 5]. Challenges in small field dosimetry are well known [6, 7] and require that an ideal dosimeter for small area radiation beams exhibits properties including: dose-rate, energy and directional independence, near water equivalence, minimal beam perturbation and small sensitive volume [8, 9]
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