aSi EPIDs for the in-vivo dosimetry of static and dynamic beams

作者：Piermattei A; Cilla S; Azario L; Greco F; Russo M; Grusio M; Orlandini L; Fidanzio A^*

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 796: 93-95.

DOI：10.1016/j.nima.2015.02.024

• Radiotherapy
• In-vivo dosimetry
• EPID

Portal imaging by amorphous silicon (aSi) photodiode is currently the most applied technology for in viva dosimetry (IVD) of static and dynamic radiotherapy beams. The strategy, adopted in this work to perform the IVD procedure by aSi EPID, is based on: in patient reconstruction of the isocenter dose and day to day comparison between 2D-portal images to verify the reproducibility of treatment delivery. About 20.000 rests have been carried our in this last 3 years in 8 radiotherapy centers using the SOFTENS program. The IVD results show that: (i) the procedure can be implemented for linacs of different manufacturer, (ii) the IVD analysis can be obtained on a computer screen, in quasi real time (about 2 min after the treatment delivery) and (in) once the causes of the discrepancies were eliminated, all the global IVD rests for single patient were within the acceptance criteria defined by: +/- 5% for the isocenier dose, and P-gamma<1 >= 90% of the checked points for the 2D portal image gamma-analysis. This work is the result of a project supported by the Istituto Nazionale di Fisica Nucleare (INFN) and Universita Cattolica del S.Cuore (UCSC). 2015 Elsevier B.V.

• 出版日期2015-10-1