A background value compensation method suitable for continuously variable frame rate

Abstract

The invention provides a background value compensation method suitable for continuously variable frame rate, which comprises the following steps: selecting a plurality of sampling frame rates, and collecting dark field images under each sampling frame rate; the sampling frame rate and its corresponding dark field image are fitted to obtain a frame rate-dark field image fitting model; Based on theframe rate-dark field image fitting model to obtain compensated dark field image at actual frame rate; and performing background value compensation on the bright field image at the actual frame rate based on the compensated dark field image to eliminate background bias caused by leakage current. The present invention solves the problem that there is no background value compensation method suitablefor continuously variable frame rate in the prior art by adopting the background value compensation method suitable for continuously variable frame rate.

Description

technical field [0001] The invention relates to the field of detectors, in particular to a background value compensation method suitable for continuously variable frame rates. Background technique [0002] In the X-ray continuous fluoroscopy system (such as orthopedic C-arm), it is necessary to have an automatic brightness control function to realize different body thickness (fat, thin, old and young), different organs or other changes (such as whether there is a grid, focus to the input screen of the intensifier, etc.), according to the absorption of X-rays by the measured object, by adjusting the loading factors, such as the tube voltage kV of the high-voltage tube, the tube current mA of the high-voltage tube, or the exposure time of X-rays ms , to keep the average image brightness of the detector (such as image intensifier, amorphous silicon flat panel detector or CMOS detector) stable, referred to as automatic brightness control (ABC). [0003] However, increasing the ...

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Problems solved by technology

[0004] Normally, increasing the X-ray exposure time ms will reduce the frame rate, and when the frame rate changes, the leakage current will make the stability of the dark field image unsatisfactory, which will bring errors to the automatic brightness control; at this time, it is necessary Compensate the background value of the image to eliminate the error

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