Use of virtual Frisch-grid CdZnTe detectors to attain sub-millimeter spatial resolution

Kisung Lee, Aleksey Bolotnikov, Seungbin Bae, Utpal Roy, Giuseppe Camarda, Matthew Petryk, Yonggang Cui, Anwar Hossain, Ge Yang, Vaclav Dedic, Kihyun Kim, Ralph James

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The goal of our study was twofold: To determine the distribution of signals in position-sensitive CdZnTe (CZT)-based virtual Frisch-grid detectors (VFGDs) with side-sensing pads, and to evaluate the feasibility of accurately measuring the X- and Y-coordinates where a photon interaction occurs within a single VFGD module. Accordingly, we collected signals from an anode, and from four or eight sensing pads attached to four sides of a CZT crystal. We assessed the anode's energy spectra and derived histograms from the side electrodes so to evaluate the feasibility of employing VFGDs as imaging devices. Using a highly collimated 30-keV X-ray beam at the National Synchrotron Light Source (NSLS), and applying some corrections to the raw signal data, we found that the signals acquired from one side of the detector were well separated from those measured at the opposite side. We also determined the photon interaction points by conventional Anger logic and via a more sophisticated statistics-based positioning (SBP) algorithm. With the current VFGD configuration, preliminary results showed that our positioning methods could increase the resolution above the intrinsic resolution of the VFGD (6 mm). Using SBP, we achieved a resolution below 1 millimeter for low-energy X- and gamma-rays.

Original languageEnglish
Title of host publicationIEEE Nuclear Science Symposium Conference Record
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479905348
DOIs
Publication statusPublished - 2013 Jan 1
Event2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013 - Seoul, Korea, Republic of
Duration: 2013 Oct 272013 Nov 2

Other

Other2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013
CountryKorea, Republic of
CitySeoul
Period13/10/2713/11/2

Fingerprint

Electrodes
spatial resolution
grids
Photons
detectors
X-Rays
positioning
Synchrotrons
Gamma Rays
Anger
anodes
statistics
Light
Equipment and Supplies
photons
histograms
logic
CdZnTe
light sources
synchrotrons

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

Cite this

Lee, K., Bolotnikov, A., Bae, S., Roy, U., Camarda, G., Petryk, M., ... James, R. (2013). Use of virtual Frisch-grid CdZnTe detectors to attain sub-millimeter spatial resolution. In IEEE Nuclear Science Symposium Conference Record [6829830] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NSSMIC.2013.6829830

Use of virtual Frisch-grid CdZnTe detectors to attain sub-millimeter spatial resolution. / Lee, Kisung; Bolotnikov, Aleksey; Bae, Seungbin; Roy, Utpal; Camarda, Giuseppe; Petryk, Matthew; Cui, Yonggang; Hossain, Anwar; Yang, Ge; Dedic, Vaclav; Kim, Kihyun; James, Ralph.

IEEE Nuclear Science Symposium Conference Record. Institute of Electrical and Electronics Engineers Inc., 2013. 6829830.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, K, Bolotnikov, A, Bae, S, Roy, U, Camarda, G, Petryk, M, Cui, Y, Hossain, A, Yang, G, Dedic, V, Kim, K & James, R 2013, Use of virtual Frisch-grid CdZnTe detectors to attain sub-millimeter spatial resolution. in IEEE Nuclear Science Symposium Conference Record., 6829830, Institute of Electrical and Electronics Engineers Inc., 2013 60th IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2013, Seoul, Korea, Republic of, 13/10/27. https://doi.org/10.1109/NSSMIC.2013.6829830
Lee K, Bolotnikov A, Bae S, Roy U, Camarda G, Petryk M et al. Use of virtual Frisch-grid CdZnTe detectors to attain sub-millimeter spatial resolution. In IEEE Nuclear Science Symposium Conference Record. Institute of Electrical and Electronics Engineers Inc. 2013. 6829830 https://doi.org/10.1109/NSSMIC.2013.6829830
Lee, Kisung ; Bolotnikov, Aleksey ; Bae, Seungbin ; Roy, Utpal ; Camarda, Giuseppe ; Petryk, Matthew ; Cui, Yonggang ; Hossain, Anwar ; Yang, Ge ; Dedic, Vaclav ; Kim, Kihyun ; James, Ralph. / Use of virtual Frisch-grid CdZnTe detectors to attain sub-millimeter spatial resolution. IEEE Nuclear Science Symposium Conference Record. Institute of Electrical and Electronics Engineers Inc., 2013.
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