X-Ray image digital subtraction system

Details X-Ray image digital subtraction system X-Ray image digital subtraction system

1981-06-08

1983-08-16

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

364414, 364722, 378 99, H04N 718

Patent

active

043994571

ABSTRACT:
In a digital fluoroscopy system, analog video signals representative of successive x-ray image frames are converted to digital pixel values that are used as addresses, respectively. A digital memory stores at its respective locations a digital value corresponding to the logarithm of an address value so that when a digital pixel value represented by an address is fed from the analog-to-digital converter to the memory the memory will output the logarithm of the pixel value in digital form. Pixel values for successive x-ray images are subtracted in-phase on a pixel-by-pixel basis to produce digital difference pixel signals which are converted to analog video signals for driving a television monitor that displays an image representative of the difference between x-ray images.

REFERENCES:
patent: 4172286 (1979-10-01), Wess
patent: 4204225 (1980-05-01), Mistretta
patent: 4204226 (1980-05-01), Mistretta
patent: 4233662 (1980-11-01), Le May
patent: 4323973 (1982-04-01), Greenfield
patent: 4367490 (1983-01-01), Riederer

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