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Titolo:
Effects of x-ray spectra on the DQE of a computed radiography system
Autore:
Fetterly, KA; Hangiandreou, NJ;
Indirizzi:
Mayo Clin, Rochester, MN 55905 USA Mayo Clin Rochester MN USA 55905Mayo Clin, Rochester, MN 55905 USA
Titolo Testata:
MEDICAL PHYSICS
fascicolo: 2, volume: 28, anno: 2001,
pagine: 241 - 249
SICI:
0094-2405(200102)28:2<241:EOXSOT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHANTOM; NOISE;
Keywords:
detective quantum efficiency; computed radiography; x-ray spectra; patient equivalent phantom; modulation transfer function; noise power spectrum;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Fetterly, KA Mayo Clin, 200 1st St SW, Rochester, MN 55905 USA Mayo Clin 200 1st St SW Rochester MN USA 55905 , MN 55905 USA
Citazione:
K.A. Fetterly e N.J. Hangiandreou, "Effects of x-ray spectra on the DQE of a computed radiography system", MED PHYS, 28(2), 2001, pp. 241-249

Abstract

The effect of incident x-ray beam quality on the measured detective quantum efficiency (DQE) of a computed radiography system was investigated. The incident x-ray beams used had peak tube potentials of 70, 95, and 120 kVp, were filtered with various thicknesses of a "patient equivalent phantom" (PEP), aluminum, and copper, and provided a consistent exposure to the storagephosphor. For each peak tube potential and filter combination, the one-dimensional modulation transfer function and noise power spectrum were measured and the square of the incident signal-to-noise ratio was estimated. The spatial frequency dependent DQE was calculated from these data. The DQE was integrated to provide an overall estimate of the efficiency and frequency response of the computed radiography system for the various x-ray beams. There was found to be a wide range of integral DQE (IDQE) values for the peak tube potential and filter combinations used. For example, the IDQE ranged from 3.0 to 0.9 mm(-2) using the peak tube potential and filter combinations70 kVp with 5.1 cm PEP and 120 kVp with 30.3 cm PEP, respectively. Finally, peak tube potential and filter combinations 70 kVp with 10.2 cm PEP and 120 kVp with 20.2 cm PEP were chosen as standard x-ray beams that will be used at our facility to measure the DQE of digital radiographic imaging systems for evaluation and acceptance testing. (C) 2001 American Association of Physicists in Medicine.

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Documento generato il 03/07/20 alle ore 01:20:36