Computer tomography apparatus including a combined recursive and

Details Computer tomography apparatus including a combined recursive and Computer tomography apparatus including a combined recursive and

1986-07-11

1988-08-02

Smith, Jerry

Boots, shoes, and leggings

378901, 364572, G06F 1562

Patent

active

047617381

ABSTRACT:
In a computer tomography apparatus in accordance with the invention the advantages of the convolution calculation are combined with the advantages of recursive filtering. The processing unit for the measurement data includes a convolution filter which has only 64 convolution factors and which performs the central part of a convolution calculation (the number of measurement data amounts to, for example 512 or 1024) and a parallel-operating recursive filter which approximates the rests of the convolution calculation situated outside the central part by recursive filtering of the measurement data. Using five different multiplication factors and a corresonding number of attenuation factors, ample accuracy is achieved. By variable of only the 64 convolution factors, a large number of different filters can be realized, without it being necessary to change the factors for recursive filtering.

REFERENCES:
patent: 3924129 (1975-12-01), LeMay
patent: 4549265 (1985-10-01), Decker

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