NDLI: Quantum efficiency of the MCP detector: Monte Carlo calculation

Content Provider	IEEE Xplore Digital Library
Author	Shikhaliev, P.M. Ducote, J.L. Tong Xu Molloi, S.
Copyright Year	1963
Abstract	A prototype scanning-slit X-ray imaging system with microchannel plate (MCP) detector has recently been developed and tested for potential applications in medical imaging. For this purpose, the quantum efficiency of the MCP needs to be calculated and verified experimentally for polychromatic X-ray beams. X-ray detection in the MCP is a cascade of several processes including the absorption of the photon in the MCP material, the escape of created fast (photo, Compton, or Auger) electrons from the MCP channel walls into the channels, triggering an avalanche of secondary electrons in the microchannels, and detecting the resulted charge pulse. Because electron transport in the material is involved in this process, Monte Carlo simulations were used to calculate the quantum efficiency of an MCP for photon beams used in mammography, computed tomography (CT), and chest radiography. The quantum efficiency of the MCP with 5-/spl mu/m channel diameter was calculated to be 68%, 89%, and 81% at X-ray tube voltages of 45, 90, and 120 kVp, which are used in scanning slit mammography, breast CT, and chest radiography, respectively. The detection efficiencies of an MCP with 2 /spl mu/m channel diameter was calculated to be 91%, 92%, and 86% at 45, 90, and 120 kVp tube voltages, respectively. The efficiency of a recently introduced silica MCP (pure SiO/sub 2/) with 5 /spl mu/m channel diameter was calculated to be 86% and 76% at 35 kVp and 45 kVp, respectively, and is rapidly decreased at higher energies. Results of the calculations show that the detection efficiencies of the MCPs are comparable to the currently available detectors in the medical X-ray imaging.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	1257
Ending Page	1262
Page Count	6
File Size	312868
File Format	PDF
ISSN	00189499
Volume Number	52
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monte Carlo methods X-ray detection X-ray imaging X-ray detectors Computed tomography Microchannel Biomedical imaging Electrons Mammography Radiography Microchannel plate (MCP) detectors Monte Carlo method photon counting quantum efficiency
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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