Optics: measuring and testing – For light transmission or absorption – Of photographic film
Patent
1978-08-07
1980-12-16
Corbin, John K.
Optics: measuring and testing
For light transmission or absorption
Of photographic film
250322, G01N 2101
Patent
active
042393957
ABSTRACT:
The present invention is an apparatus and a method for using the apparatus to maintain quality control over a radiographic imaging system by precisely exposing two areas of a film to even illumination from a light source attenuated by different precisely known amounts. Both exposures are chosen to fall on the linear portion of the film's density-log exposure curve. The film is developed and the densities of the exposed areas are sensed photometrically. The film's base plus fog density, gamma and "processor quality factor" (which is a measure of the sensed film's deviation from the gamma and speed of a reference film processed in a reference processor) are automatically calculated. The processor quality factor allows faulty radiographic technique to be detected apart from faulty film or faulty processing without re-exposing the patient to additional radiation.
REFERENCES:
patent: 2296048 (1942-09-01), Planskoy
patent: 2478406 (1949-08-01), Lamb
patent: 3528749 (1970-09-01), Bowker
patent: 3624724 (1971-11-01), Sheffer
patent: 3995959 (1976-12-01), Shaber
Lawrence, D. J., "A Simple Method of Processor Control", Medical Radiography and Photography, vol. 49, No. 1, pp. 2-6, 28, 1973.
ANSI Ph 2.19-1976, "Conditions for Diffuse and Doubly Diffuse Transmission Measurements".
Eastman Kodak, "Sensitometric Properties of X-Ray Films", Radiography Markets Div., Rochester, N.Y., 14650.
Weston Electric Inst. Co. Engineering Notes, vol. 4, No. 3, Jul. 1949, "Densitometers and Their Use in Technology, Medicine, and Commerce".
Arnold Bruce Y.
Corbin John K.
Dula Arthur M.
LandOfFree
Radiographic imaging system quality monitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiographic imaging system quality monitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiographic imaging system quality monitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-605333