Arrangements for constructing representations of parts of bodies

Details Arrangements for constructing representations of parts of bodies Arrangements for constructing representations of parts of bodies

1979-05-09

1981-06-23

Krass, Errol A.

Boots, shoes, and leggings

250445T, 364515, G06F 1542

Patent

active

042754445

ABSTRACT:
In CT scanners signals representing attenuation of radiation along beam paths through the patient may be processed by a convolution technique to give radiation absorption values for a matrix of elements in a region of interest. It the beams are distributed in a fan-shape from a focus the convolution can be applied but the signals need to be weighted by a factor related to the distance of a respective matrix element from the focus. By consideration of the geometry of a CT scanner of this kind it has been found that the weighting may be achieved more efficiently if the signals for all beams are preweighted by a factor related to the angular position of the beam in the fan, leaving only a simple scaling factor which needs to be applied for each martrix element.

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Herman et al., "Reconstruction Using Divergent-Ray Shadowgraphs"; Reconstruction Tomography in Diagnostic Radiology and Nuclear Medicine; ed. Ter Pogossian et al., pp. 105-117.

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