[The evaluation of the performance of a new-concept screen-film system].
Aim of this work is to show the results of the evaluation of the sensitometric properties of a new Du Pont anti cross-over radiographic film system called Ultra Vision, based on a new film and different YTaO4 undoped screens whose emission is centered at about 335 nm. Fog, contrast, latitude, sensitivity, noise and resolution were tested: the MTFs were obtained by exposing a standard resolution pattern and using the "zero"-frequency step as a knife edge. The image of this knife edge was scanned with a microdensitometer with a 20 microns slit. The results (at 70 kVp with 2.5 mm Al and 2.5 mm Cu total filtration), compared with those of Du Pont conventional radiographic screen-film systems Cronex 10 S/Quanta, show that the new system significantly increases contrast, sensitivity and resolution and will consequently improve, in the clinical use, radiographic image quality.
Tosi
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G
Servizio di Fisica Sanitaria, Ospedale Niguarda Ca' Granda, Milano.
Brambilla
M G
MG
De Crescenzo
S
S
D004867:Equipment Design; D005069:Evaluation Studies as Topic; D011786:Quality Control; D012680:Sensitivity and Specificity; D014962:X-Ray Film / Q000592:standards; D014963:X-Ray Intensifying Screens / Q000592:standards
Valutazione delle prestazioni di un sistema schermo pellicola di nuova concezione.