Radiography

Details Radiography Radiography

1977-08-08

1983-08-09

Smith, Alfred E.

Boots, shoes, and leggings

378901, A61B 600

Patent

active

043982514

ABSTRACT:
A CT scanner is disclosed in which sets of X-radiation measurements, each set being for a fan-shaped distribution of beam paths, are used by a convolving circuit as though they were for sets of parallel beam paths. The inaccuracies due to this are countered by using correction factors, one for each pixel of the final picture of the patient slice, which correction factors are derived by the use of a phantom of known X-ray response. In addition, a special interpolation technique is disclosed to facilitate accurate back projection.

REFERENCES:
patent: 3881110 (1975-04-01), Hounsfield et al.
patent: 3924129 (1975-12-01), LeMay
patent: 4002910 (1977-01-01), LeMay
patent: 4010371 (1977-03-01), LeMay
patent: 4051378 (1977-09-01), Krippner
patent: 4088887 (1978-05-01), LeMay
patent: 4149247 (1979-04-01), Pavkovich et al.
patent: 4149248 (1979-04-01), Pavkovich
patent: 4149249 (1979-04-01), Pavkovich
James et al., Mathematics Dictionary, Revised Edition, The Digest Press, Van Nuys CA 1946, Title Page, pp. 116, 117, and 138.

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