SciFi detector and associated method for real‐time determination of profile and output factor for small fields in stereotactic radiotherapy
Medical Physics2020Vol. 47(4), pp. 1930–1939
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Patrick Pittet, Josué Esteves, J.‐M. Galvan, Guo‐Neng Lu, F. Blanc, G. Haefeli, P. Hopchev, Simon Rit, Laurent Desbat, J. Ribouton, P. Jalade
Abstract
We propose and have tested a SciFi plastic scintillating detector with an optimized signal processing method to characterize small fields defined by cone collimators. It allows the determination of key field parameters such as full width at half maximum (FWHM) and field output factors. The results are consistent with those independently measured using TLD and radiochromic films. As the SciFi detector does not require a correction factor, it is in line with the International Atomic Energy Agency (IAEA) and the American Association of Physicists in Medicine (AAPM) TRS-483 recommendations, and can be suitable for online QA of small radiation fields used in photon beam radiotherapy, and is compatible with MRI-LINAC.
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