Innovative detectors for quality assurance dosimetry in SBRT of stationary and movable targets

Micro-Mini & Nano-Dosimetry & Innovative Technologies in Radiation Therapy

Newall, M.K.^1 ; Petasecca, M.^1 ; Duncan, M.^1 ; Fuduli, I.^1 ; Shukaili, K Al^1 ; Booth, J.T.^2 ; Keall, P.^2,3 ; Corde, S.^1,4 ; Pereveratylo, V.^5 ; Lerch, M.^1 ; Rosenfeld, A.B.^1

Centre for Medical Radiation Physics, University of Wollongong, Australia^1

North Shore Cancer Care Centre, Australia^2

Radiation Physics Laboratory, University of Sydney, Australia^3

Department of Radiation Oncology, Prince of Wales Hospital, Australia^4

SPA-BIT, Kiev, Ukraine^5

关键词: Beam profiles;    Electromagnetic arrays;    Film measurement;    Periodic motion;    Real-time motion;    Silicon detector arrays;    Spatial and temporal resolutions;    Spatial resolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/777/1/012014/pdf
DOI  :  10.1088/1742-6596/777/1/012014

来源: IOP

【 摘 要 】

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 cm2and 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 cm2from within 75% in the penumbra to within 11% agreement. The dynamic profile is returned to a similar distribution as the static case.