Image analysis – Applications – Biomedical applications
Patent
1994-08-05
1997-11-04
Couso, Jose L.
Image analysis
Applications
Biomedical applications
382132, 382172, G06K 900
Patent
active
056848889
ABSTRACT:
A method for monitoring the sensitivity of a system that reads a radiation image or an irradiated object with the radiation image being stored in a photostimulable phosphor screen. The method employs the steps of scanning the screen with stimulating irradiation, detecting the light emitted upon stimulation, compressing the electric representation through square root amplification, and then digitizing the compressed electric representation. For a sensitivity class that was set when the radiation image was generated a corresponding expected noise variance value .sigma..sub.e.sup.2 is retrieved from a predefined table and the ratio .sigma..sub.y.sup.2 /.sigma..sub.e.sup.2 is calculated and thresholded. A warning is generated when the ratio exceeds a threshold value T.sub.+ or when the ratio is smaller than a threshold value T.
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AGFA-GEVAERT
Bella Matthew C.
Birch Richard J.
Couso Jose L.
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