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Title: Performance evaluation of a computed radiography imaging device using a typical 'front side' and novel 'dual side' readout storage phosphors

Abstract

The Fourier-space modulation transfer function (MTF), normalized noise power spectrum (nNPS), and detective quantum efficiency (DQE) of a computed radiography (CR) x-ray imaging device were measured. Two different storage phosphor screens were used in conjunction with a single CR reader (Fuji, Clearview, CS). One of the storage phosphor plates (ST-BD) had a clear backing material which allowed 'dual side read' of the latent image from both the 'front' and 'back' sides of the phosphor. The other phosphor plate had a light occluding backing material, limiting the readout to front side only (ST-VI). The standard RQA-5 beam quality was used. The MTF was measured using a 1 mm thick tungsten edge device. Compared to the ST-55BD phosphor, the ST-VI phosphor was found to have modestly higher MTF at all spatial frequencies. The nNPS(f) and DQE(f) were measured for nominal incident exposure levels ranging from 0.1 to 10 mR. The dual side read phosphor demonstrated superior DQE, especially at low spatial frequencies. At the frequency 0.5 cycles/mm, the DQE values for the 1 mR exposure were 0.36 and 0.21 for the ST-55BD and ST-VI phosphor plates, respectively. The differences between the spatial-frequency dependent DQE of the two plates can be attributed tomore » the increased signal collection efficiency of the dual side read plates and differences in storage phosphor structure noise.« less

Authors:
;  [1]
  1. Diagnostic Radiology Department, Mayo Clinic, Rochester, Minnesota 55905 (United States)
Publication Date:
OSTI Identifier:
20775052
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 33; Journal Issue: 2; Other Information: DOI: 10.1118/1.2143306; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; COMPUTERIZED TOMOGRAPHY; EVALUATION; FOURIER TRANSFORMATION; FREQUENCY DEPENDENCE; LATENT IMAGES; MODULATION; NOISE; PERFORMANCE; PHOSPHORS; QUANTUM EFFICIENCY; TRANSFER FUNCTIONS; TUNGSTEN

Citation Formats

Fetterly, Kenneth A., and Schueler, Beth A. Performance evaluation of a computed radiography imaging device using a typical 'front side' and novel 'dual side' readout storage phosphors. United States: N. p., 2006. Web. doi:10.1118/1.2143306.
Fetterly, Kenneth A., & Schueler, Beth A. Performance evaluation of a computed radiography imaging device using a typical 'front side' and novel 'dual side' readout storage phosphors. United States. doi:10.1118/1.2143306.
Fetterly, Kenneth A., and Schueler, Beth A. Wed . "Performance evaluation of a computed radiography imaging device using a typical 'front side' and novel 'dual side' readout storage phosphors". United States. doi:10.1118/1.2143306.
@article{osti_20775052,
title = {Performance evaluation of a computed radiography imaging device using a typical 'front side' and novel 'dual side' readout storage phosphors},
author = {Fetterly, Kenneth A. and Schueler, Beth A.},
abstractNote = {The Fourier-space modulation transfer function (MTF), normalized noise power spectrum (nNPS), and detective quantum efficiency (DQE) of a computed radiography (CR) x-ray imaging device were measured. Two different storage phosphor screens were used in conjunction with a single CR reader (Fuji, Clearview, CS). One of the storage phosphor plates (ST-BD) had a clear backing material which allowed 'dual side read' of the latent image from both the 'front' and 'back' sides of the phosphor. The other phosphor plate had a light occluding backing material, limiting the readout to front side only (ST-VI). The standard RQA-5 beam quality was used. The MTF was measured using a 1 mm thick tungsten edge device. Compared to the ST-55BD phosphor, the ST-VI phosphor was found to have modestly higher MTF at all spatial frequencies. The nNPS(f) and DQE(f) were measured for nominal incident exposure levels ranging from 0.1 to 10 mR. The dual side read phosphor demonstrated superior DQE, especially at low spatial frequencies. At the frequency 0.5 cycles/mm, the DQE values for the 1 mR exposure were 0.36 and 0.21 for the ST-55BD and ST-VI phosphor plates, respectively. The differences between the spatial-frequency dependent DQE of the two plates can be attributed to the increased signal collection efficiency of the dual side read plates and differences in storage phosphor structure noise.},
doi = {10.1118/1.2143306},
journal = {Medical Physics},
number = 2,
volume = 33,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}