Automatic Brightness Stabilizers

Melvin P. Siedband

doi:10.1117/12.954061

1 February 1975 Automatic Brightness Stabilizers

Melvin P. Siedband

Proceedings Volume 0047, Application of Optical Instrumentation in Medicine III; (1975) https://doi.org/10.1117/12.954061
Event: Application of Optical Instrumentation in Medicine III, 1974, Kansas City, United States

Abstract

The Automatic Brightness Stabilizer, ABS, is that part of the X-ray control system which keeps the light output of the image intensifier constant over variations of patient attenuation and system geometry. This permits consistent TV or film exposures during a series of fluoroscopic examinations. (Ref. 1) A properly designed ABS will operate with several constraints: 1. It will hold the image brightness constant for variations of patient thickness and attenuation. 2. It will ignore marginal flashes and the effects of normal coning. 3. It will preserve image contrast and minimize noise. 4. It will keep the operation within generator ratings. 5. It will effect a reasonable compro-mise between patient exposure and image quality. 6. It will keep patient exposure to below 5 R/min except when an override is used. 7. It will respond fast enough to track during an examination. 8. It will correct for system variables such as IA mode, camera rate, etc. 9. It can be shut off and held at a particular value (after reaching equilibrium) prior to injection of contrast media. 10. It can be shut off to allow manual control of factors.

Citation Download Citation

Melvin P. Siedband "Automatic Brightness Stabilizers", Proc. SPIE 0047, Application of Optical Instrumentation in Medicine III, (1 February 1975); https://doi.org/10.1117/12.954061

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