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High‐resolution fiber‐optic dosimeters for microbeam radiation therapy
Author(s) -
Archer James,
Li Enbang,
Petasecca Marco,
Lerch Michael,
Rosenfeld Anatoly,
Carolan Martin
Publication year - 2017
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1002/mp.12209
Subject(s) - dosimeter , scintillator , optics , optical fiber , materials science , cherenkov radiation , microbeam , scintillation , dosimetry , image resolution , radiation , physics , nuclear medicine , detector , medicine
Purpose A high resolution, water equivalent, optical and passive x‐ray dosimeter has been constructed using plastic scintillator and optical fiber. This dosimeter has a peak edge‐on spatial resolution of 100 μm in one dimension, with a 10 μm resolution dosimeter under investigation. The dosimeter design has a potential application in synchrotron x‐ray microbeam radiation therapy where a high resolution is vital for accurate dose measurements and quality assurance. Methods BC ‐400 plastic scintillator, of thickness 100 μm, was optically coupled to an optical fiber with core diameter 1 mm. The end was coated in optical paint to improve sensitivity. An identical fiber was made without the scintillator to measure the background Cherenkov radiation induced in the fiber, to allow background signal subtraction. The light captured by the fibers was measured by PMT s. The probe system was exposed to a 6 MV , 10 × 10 cm 2 LINAC x‐ray field and the beam profile was measured at 100 cm, as well as the depth dose profile. Results The measured profiles matched well with ionisation chamber data. Important beam parameters such as penumbra width and percent depth dose at various depths matched the ionisation chamber data, within uncertainty. Conclusions This work demonstrates that high resolutions can be achieved with a scintillation and optical fiber system. The probe is water‐equivalent, passive, energy independent, radiation hard and inexpensive, making it ideal for further improvements for use with microbeam radiation therapy.