X-ray examination apparatus having means for correcting scattere

Details X-ray examination apparatus having means for correcting scattere X-ray examination apparatus having means for correcting scattere

1993-04-07

1994-07-05

Church, Craig E.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 9812, H05G 164

Patent

active

053274768

ABSTRACT:
It is known that perturbations caused by scattered-radiation in an x-ray image can be partially avoided by employing a scattered-radiation grid. A device for further improvement of an x-ray image, in that real-time correction of scattered-radiation effects is achieved, is provided according to the invention. Behind x-ray absorbing parts of the scattered-radiation grid only scattered-radiation appears, whereas both scattered-radiation and primary radiation appear behind transparent channels of the scattered-radiation grid. The scattered-radiation grid gives rise to a high-frequency intensity modulation in the x-ray image. From the high-frequency component of the corresponding video signal produced by the x-ray detector, selection signals are generated by a double pulse generator for distinguishing signal amplitudes of the video signal, corresponding to intensities behind absorbing parts and transparent parts, respectively, of the scattered-radiation grid. The selection signals are supplied to a synchronous detector to split the video signal from the x-ray detector into separated video signals corresponding to scattered-radiation and primary radiation and to scattered-radiation only, respectively. A video signal corresponding to a corrected image is obtained by subtraction of the separated video signals.

REFERENCES:
patent: 4677681 (1987-06-01), Klausz
patent: 4918713 (1990-04-01), Honda

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