Method for the estimation and calibration of the lumination rece

Details Method for the estimation and calibration of the lumination rece Method for the estimation and calibration of the lumination rece

1991-07-05

1992-11-24

Hannaher, Constantine

X-ray or gamma ray systems or devices

Accessory

Testing or calibration

378 97, G01D 1800

Patent

active

051669692

ABSTRACT:
The invention concerns radiology systems and, more particularly, in such systems, to a method to determine and calibrate the lumination (namely the quantity of light received multiplied by the exposure time) received by the radiographic film in order to obtain a given blackening of the film. This method consists in carrying out a certain number of calibrations of the radiology system, and then in making a sensitogram of the type of film used. Then, a radiographic shot is taken with an object of a known thickness E.sub.o and, to obtain a reference optical density DO.sub.refo, the optical density DO.sub.m of the shot obtained is measured and compared with DO.sub.refo on the sensitogram to determine L.sub.ref.

REFERENCES:
patent: 4748649 (1988-05-01), Griesmer
patent: 4980905 (1990-12-01), Meccariello
patent: 5068788 (1991-11-01), Goodenough et al.
Applied Optics, vol. 23, No. 5, Mar. 1, 1984, New York, pp. 762-766; D. Pasini et al.: "In-situ calibration technique for x-ray films".

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