Artifacts in High-Energy Compton Imaging With 3-D Position-Sensitive CdZnTe

Citations Over TimeTop 10% of 2020 papers

Abstract

High-energy gamma-ray imaging is an important technique with applications in homeland security and medical imaging. Recent advancements in the cadmium zinc telluride (CdZnTe) OrionUM detector systems have enabled measurement of gamma-ray sources with energies up to 9 MeV. However, Compton imaging of photons above 3 MeV faces several challenges that degrade both spectroscopic and imaging performances in pixelated CdZnTe systems. These factors include the increase in pair-production events, incorrect event sequencing, and charge sharing from large electron clouds. They all result in shift-variant image artifacts that degrade the signal-to-noise ratio as well as create artifacts that might be mistaken for a hot spot. The degradation from artifacts is analyzed and discussed, and possible mitigation techniques are presented to allow for recovery of the Compton image signal. Simulation is compared with experimental measurements of 4.4-MeV gamma rays from a 238 PuBe source to investigate the artifacts.

Related Papers

• → Performance Test and Evaluation for Pixel CdZnTe Detector of Different Thickness(2014)1 cited
• → Condensation of photons in a hot plasma(1974)8 cited
• COMPTON SCATTERING OF 662 kev GAMMA RAYS FROM IRON(1963)
• → Time-independent inverse compton spectrum for photons from a plasma cloud of finite extent(2009)
• → Anisotropic Photon and Electron Scattering without Ultrarelativistic Approximation(2022)