The contrast-detail behaviour of a photostimulable phosphor based computed radiography system.
Contrast-detail measurements were performed on a computed radiography imaging system as a function of detector entrance air kerma over the dose range from 0.743 microGy (0.085 mR) to 277 microGy (31.8 mR). A theoretical model of contrast-detail behaviour for a photostimulable phosphor computed radiography system has been derived, which is based on a modified version of the Rose theory of threshold detection. Included in the model are both system and x-ray quantum noise terms, as well as the response of the eye. The zero-frequency noise power of the computed film images was measured with a double-beam scanning microdensitometer. For a given detector dose, good agreement was found between the predicted and measured data when this measurement of system noise was included in the model. The contrast-detail results obtained for the computed radiography system were also compared with contrast-detail results for an image intensifier-TV based digital imaging system and a conventional film-screen system.
Marshall
N W
NW
Regional Medical Physics Department, Newcastle General Hospital, Westgate Road, Newcastle upon Tyne NE4 6BE, UK.
Faulkner
K
K
Busch
H P
HP
Lehmann
K J
KJ
D000388:Air; D006801:Humans; D015233:Models, Statistical; D008962:Models, Theoretical; D010758:Phosphorus / Q000737:chemistry*; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted; D013902:Radiography, Thoracic; D011874:Radiometry / Q000379:methods*; D012680:Sensitivity and Specificity; D012984:Software; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods*; D014962:X-Ray Film; D014963:X-Ray Intensifying Screens; D014965:X-Rays
D010758:Phosphorus