(19)
(11) EP 0 384 634 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.11.1990 Bulletin 1990/45

(43) Date of publication A2:
29.08.1990 Bulletin 1990/35

(21) Application number: 90301550.1

(22) Date of filing: 14.02.1990
(51) International Patent Classification (IPC)5: G03C 5/17
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 23.02.1989 US 314023
29.06.1989 US 373720
26.12.1989 US 456889

(71) Applicant: EASTMAN KODAK COMPANY
Rochester, New York 14650-2201 (US)

(72) Inventors:
  • Bunch, Phillip Carter, c/o EASTMAN KODAK COMPANY
    Rochester, New York 14650 (US)
  • Dickerson, Robert Edward, c/o EASTMAN KODAK COMP.
    Rochester, New York 14650 (US)

(74) Representative: Baron, Paul Alexander Clifford et al
Kodak Limited Patent Department Headstone Drive
Harrow Middlesex HA1 4TY
Harrow Middlesex HA1 4TY (GB)


(56) References cited: : 
   
       


    (54) Radiographic screen/film assemblies with improved detection quantum efficiencies


    (57) Assemblies of double coated radiographic elements exhibiting sharply curtailed crossover and front and back intensifying screen pairs are disclosed. By choosing a front screen that exceeds a stated sharpness criterion, expressed in terms of modulation transfer factors (MTF), and a back screen and adjacent emulsion layer unit combination exhibiting a photicity at least twice that of the combination of the front screen and its adjacent emulsion layer unit an enhancement in detective quantum efficiency (DQE) is realized.






    Search report