Tomographic apparatus

Details Tomographic apparatus Tomographic apparatus

1985-05-09

1987-11-17

Smith, Jerry

Boots, shoes, and leggings

378901, 364581, G06F 1542

Patent

active

047078227

ABSTRACT:
An apparatus for reconstructing a tomographic image of an object which is positioned within a scanning circle and which is scanned by a fan-shaped beam of radiation partially rotating around the scanning circle. Source fan sets of data are sorted into detector fan sets of data, some of which contain overlapping data. A weighting function is applied to the overlapping data. Convolution of the detector fan sets of data including data average by the weighting function is performed without reordering the detector fan data into parallel data to derive convoluted data which may be back projected and accumulated and ultimately utilized to display an image of the scanned object. Preferably a non-oscillating convolution function is employed.

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patent: 4284896 (1981-08-01), Stonestrom
patent: 4293912 (1981-10-01), Walters
patent: 4326252 (1982-04-01), Kohno
patent: 4583241 (1986-04-01), Walters
Ramachandran et al., Acad. Sci., 68: 2236, 1971 p. 53.
"Reconstruction from Divergent Ray Data" A. V. Lakshminarayanan, Technical Report No. 91, Jan. 1975.
"Short-Scan Fan-Beam Algorithms for CT", Abraham Naparstek, IEEE Transactions on Nuclear Science, vol. NS-27, No. 3, Jun. 1980.
"Optimal Short Scan Convolution Reconstruction for Fanbeam CT", Dennis L. Parker, Med. Phys. 9(2), Mar./Apr. 1982.
"Optimization of Short Scan Convolution Reconstruction in Fan Beam CT" by Dennis L. Parker, IEEE 1982.

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