Characterizing energy dependence and count rate performance of a dual scintillator fiber-optic detector for computed tomography

Medical Physics
Matthew R HoernerD E Hintenlang

Abstract

Kilovoltage (kV) x-rays pose a significant challenge for radiation dosimetry. In the kV energy range, even small differences in material composition can result in significant variations in the absorbed energy between soft tissue and the detector. In addition, the use of electronic systems in light detection has demonstrated measurement losses at high photon fluence rates incident to the detector. This study investigated the feasibility of using a novel dual scintillator detector and whether its response to changes in beam energy from scatter and hardening is readily quantified. The detector incorporates a tissue-equivalent plastic scintillator and a gadolinium oxysulfide scintillator, which has a higher sensitivity to scatter x-rays. The detector was constructed by coupling two scintillators: (1) small cylindrical plastic scintillator, 500 μm in diameter and 2 mm in length, and (2) 100 micron sheet of gadolinium oxysulfide 500 μm in diameter, each to a 2 m long optical fiber, which acts as a light guide to transmit scintillation photons from the sensitive element to a photomultiplier tube. Count rate linearity data were obtained from a wide range of exposure rates delivered from a radiological x-ray tube by adjusting the tube c...Continue Reading

References

May 8, 1999·Physics in Medicine and Biology·J F WilliamsonH Hedtjärn
Aug 6, 1999·Medical Physics·T Woldeselassie
Jul 7, 2001·Medical Physics·C M MaUNKNOWN American Association of Physicists in Medicine
May 27, 2003·Physics in Medicine and Biology·A Sam BeddarT Rockwell Mackie
Mar 30, 2004·Applied Optics·Brian L JustusRobert W Miller
Oct 7, 2006·Medical Physics·Guylaine AyotteLuc Beaulieu
Jan 18, 2007·Applied Optics·Justin ElseySimon C Fleming
Oct 11, 2008·Radiation Protection Dosimetry·A Kyle Jones, David Hintenlang
Mar 15, 1988·Applied Optics·H KumeD Fatlowitz

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