Share Email Print
cover

Proceedings Paper

Effect of external magnetic field on the collected Cherenkov radiation by fiber optic dosimeters
Author(s): Borna Maraghechi; Yao Hao; Sunje Hong; Harold Li; Sasa Mutic; Arash Darafsheh
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Fiber optic-based dosimeters composed of a scintillating sensor element connected to an un-doped transport optical fiber are interesting tools for radiation therapy dosimetry and quality assurance, due to their advantageous features including small physical size, mechanical flexibility, and being tissue-equivalent. With the introduction of emerging treatment modalities, especially with MRI-guidance available during radiation therapy, there is a need to fully investigate the influence of the magnetic field on the response of fiber optic dosimeters. In this work, we studied the Cherenkov light collected by transport optical fibers, manifested as a “stem effect” in fiber optic dosimeters. Two plastic fibers (core diameters of 1 and 2 mm) were irradiated with 6 MV photon beam generated using a conventional medical linear accelerator (no magnetic field) and an MRI-equipped linear accelerator with a 0.35 T magnetic field. The measurement setup was identical in both systems and the fibers received same amount of radiation dose. The fiber was placed between tissue-mimicking plastic layers at different depths and irradiated at a 10×10 cm2 field size. Spectroscopy was performed using a fiber-coupled spectrometer in 450 to 650 nm range with 2.5 nm resolution. We found that the amount of Cherenkov light collected by the fibers is increased in the presence of the magnetic field. The amount of this increase depends on the fiber’s core size and depth of measurement.

Paper Details

Date Published: 25 February 2020
PDF: 5 pages
Proc. SPIE 11224, Optics and Ionizing Radiation, 112240E (25 February 2020); doi: 10.1117/12.2543246
Show Author Affiliations
Borna Maraghechi, Washington Univ. School of Medicine in St. Louis (United States)
Yao Hao, Washington Univ. School of Medicine in St. Louis (United States)
Sunje Hong, Washington Univ. School of Medicine in St. Louis (United States)
Harold Li, Washington Univ. School of Medicine in St. Louis (United States)
Sasa Mutic, Washington Univ. School of Medicine in St. Louis (United States)
Arash Darafsheh, Washington Univ. School of Medicine in St. Louis (United States)


Published in SPIE Proceedings Vol. 11224:
Optics and Ionizing Radiation
Brian W. Pogue, Editor(s)

© SPIE. Terms of Use
Back to Top
PREMIUM CONTENT
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?
close_icon_gray