X-ray image subtracting system

Details X-ray image subtracting system X-ray image subtracting system

1981-01-28

1982-10-19

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

378 99, H04N 532

Patent

active

043553311

ABSTRACT:
An x-ray source projects successive high and low energy x-ray beam pulses through a body and the resultant x-ray images are converted to optical images. Two image pick-up devices such as TV cameras that have synchronously operated shutters receive the alternate images and convert them to corresponding analog video signals. In some embodiments, the analog signals are converted to a matrix of digital pixel signals that are variously processed and subtracted and converted to signals for driving a TV monitor display and analog storage devices. In other embodiments the signals are processed and subtracted in analog form for display. The high and low energy pulses can follow each other immediately so good registration between subtracted images is obtainable even though the anatomy is in motion. The energy levels of the x-ray pulses are chosen to maximize the difference in attenuation between the anatomical structure which is to be subtracted out and that which remains.

REFERENCES:
patent: 3974386 (1976-08-01), Mistretta et al.
patent: 4204225 (1980-05-01), Mistretta
patent: 4204226 (1980-05-01), Mistretta et al.

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