Premium
Theoretical and experimental determination of sensitivity and edge enhancement in xeroradiography and ionography
Author(s) -
Plewes D.,
Johns H. E.
Publication year - 1980
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594712
Subject(s) - xeroradiography , sensitivity (control systems) , enhanced data rates for gsm evolution , materials science , optics , nuclear medicine , medical physics , physics , medicine , computer science , radiology , radiography , artificial intelligence , engineering , electronic engineering
A study of the factors affecting image quality and x‐ray sensitivity of ionography and xeroradiography is presented. First, the relative charge sensitivities (nC/cm 2 mR) are compared. It is shown that high pressure xenon (10 atm cm) as used in ionography produces more than 2.5–3.5 times more charge than the selenium layers used in xeroradiography for the same x‐ray exposure. The influence of development time and toner deposition on the appearance of images is investigated theoretically and experimentally. A parameter describing development sensitivity is proposed. It is shown that an increase in development sensitivity (OD cm 2 /nC) with increasing development time is accompanied by a loss in edge enhancement. The development sensitivity of ionography is about twice that typical of xeroradiography. This makes the total sensitivity (OD/mR) of the ionography process more than 4.5–6.5 times that of xeroradiography. The total sensitivity of ionography is about 1/2 that of par speed film screen combinations.