Surgery – Truss – Pad
Patent
1982-09-30
1985-06-04
Howell, Kyle L.
Surgery
Truss
Pad
A61B 600
Patent
active
045208298
ABSTRACT:
Angiographic process utilizing contrast mediums for the roentgenographic representation of living organ vessels, especially human, wherein a blank photograph is made of a vascular region to be visualized, a contrast medium is infused into said vascular region, a photograph of the same region is produced after a given time interval, for example 0.5 seconds, and a visual image is produced by photographic subtraction of the two pictures, whereby the quantity of the contrast medium and the X-ray dose used to produce the pictures are reduced by photographically equivalent factors to such an extent that the desired information lies in a density range (blackening range) unsuited to direct observation, and whereby in the process of photographic subtraction the density range containing the information is extracted and transposed onto a visual density range suitable for direct observation of the image.
REFERENCES:
patent: 2379814 (1945-07-01), McFarland
patent: 3121792 (1964-02-01), Mittelstaedt
patent: 3231737 (1966-01-01), Mittelstaedt
patent: 4322619 (1982-03-01), Nelson et al.
Mardix, S., "Radiographs in Relief", Materials Evaluation, vol. 4, #5, May 1976, pp. 97-102.
Howell Kyle L.
Jaworski Francis J.
Lohse Karl-Heinz
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