Method of and device for determining body contours for the measu

Details Method of and device for determining body contours for the measu Method of and device for determining body contours for the measu

1979-10-09

1981-12-01

Smith, Alfred E.

Radiant energy

Inspection of solids or liquids by charged particles

Analyte supports

A61B 600

Patent

active

043038298

ABSTRACT:
The invention relates to a method of determining the contour of a body slice which is irradiated in different directions situated in the slice in order to determine radiation absorption values. Taking into account the body contour, the absorption distribution of an examination zone situated fully or partly inside the slice can thus be reconstructed. To this end, the body is brought into contact with a confining member which contacts the body at different points which are situated in the irradiated plane. On each beam path which extends through one of the contact points and through the examination zone a contour point of the body is determined, the distance between this contour point and the contact point being determined as a value which corresponds to the quotient of the absorption values (Q(p, .upsilon.)), each time associated with the beam path and obtained by measurement of the body absorption, and a predetermined, mean absorption coefficient (.mu.). The body contour can thus be at least approximately determined.
The reconstruction of the absorption distribution in the examination zone is realized so that the body zone extending outside the beam paths extending through the examination zone is divided into strips, the length of which is limited by the body contour, absorption data being assigned to the strips wherefrom, in conjunction with the absorption values, the absorption distribution in the examination zone is reconstructed.

REFERENCES:
patent: 4034224 (1977-07-01), Heavens et al.
patent: 4114040 (1978-09-01), Hounsfield

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