Computed tomography apparatus with compensation for smoothing wh

Details Computed tomography apparatus with compensation for smoothing wh Computed tomography apparatus with compensation for smoothing wh

1994-09-27

1996-11-26

Lateef, Marvin M.

Surgery

Truss

Pad

378 4, 382131, A61B 505

Patent

active

055775012

ABSTRACT:
In a computed tomography apparatus wherein an examination subject is irradiated by an x-ray beam from a number of different angular positions, a measured data set is obtained in a first geometry, and the reconstruction of the tomographic image ensues by interpolation of the measured data in a second geometry. The interpolation results in an unwanted smoothing of the data. In order to compensate for this smoothing, the data in the frequency space are divided by the average Fourier transform of the interpolation function, or alternatively, a discrete convolution of the data in the spatial domain is undertaken.

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patent: 5307264 (1994-04-01), Waggener et al.
patent: 5446799 (1995-08-01), Tuy
"Die Fouriertransformation in der Bildverarbeitung 1. Teil," Muller, Elektronik 3/2.2 (1990), pp. 50-59.
"Reordering Schemes for Multiple-Rotation Fan-Beam CT Scanner," Jelinek et al., IEEE Trans. on Med. Imag., vol. MI-4, No. 4, Dec. 1985, pp. 215-221.

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