Method of measuring blood flow by radiation

Details Method of measuring blood flow by radiation Method of measuring blood flow by radiation

1975-10-10

1977-07-26

Kamm, William E.

Surgery

Truss

Perineal

A61B 602

Patent

active

040375854

ABSTRACT:
A method of measuring relative blood flow through at least a part of the body using penetrating radiation comprises transmitting a plurality of rays at an initial angle or initial mean angle through a planar slice of the body to define a first set of rays, transmitting a plurality of further sets of rays at angles or mean angles different from each other and from the initial angle or initial mean angle through the same planar slice of the body to define by the intersection of all such rays a two-dimensional matrix of elements of the body in the slice, measuring for each ray emerging from the body a number of momentary signals over the period of time at least equal to a pulse interval representing the momentary sum of the transmissions or absorptions of the element of the body intersected by the ray, determining from the momentary signals a difference signal representing the maximum difference between the momentary signals for each ray over the period of time, deriving sets of discrete difference signals corresponding to the sets of rays, the difference signals being indicative of the transmission or absorption of blood flowing through each element of the body in the matrix, and calculating from the difference signals resultant signals representing the transmissions or absorptions due to blood flow in the elements of the matrix. These resultant signals may be visually depicted on a cathode ray tube display, as a digital print-out, or as a photograph.

REFERENCES:
patent: 3670715 (1972-06-01), Perlhou et al.
patent: 3759247 (1973-09-01), Doll et al.
patent: 3769966 (1973-11-01), Youdin et al.
patent: 3778614 (1973-12-01), Hounsfield

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