Radiography

Details Radiography Radiography

1978-02-13

1980-11-11

Krass, Errol A.

Boots, shoes, and leggings

250445T, G01N 2134

Patent

active

042336627

ABSTRACT:
A medical diagnostic X-ray machine (CT scanner) is disclosed using a technique of filtered or compensated back-projection or layergram to form a picture of a patient slice. In examining a body by means of X-rays or other penetrating radiation, signals are derived representing the logarithm of the absorption of individual beams in sets of parallel beams which are passed through the body in a single plane at many different angles. Corresponding to each such signal there is derived a summation signal produced by a process of convolution using a convolution function of a special form which is such that the convolution can be effected in a recirculatory circuit. An image of the plane section is reconstructed by selectively superimposing the summation signals producing the effect of what may be termed a compensated layergram.

REFERENCES:
patent: 3778614 (1973-12-01), Hounsfield

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