Title:
METHOD FOR COMPENSATING PROJECTION OF PARTIAL REGION SCANNING
Document Type and Number:
Japanese Patent JPS5689243
Kind Code:
A
Abstract:
A method of preprocessing incomplete or truncated projections obtained from high resolution CT scanning of a small scan circle corresponding to a limited region of interest within the scanned object. An air calibration is performed to obtain a set of air values. The intensity values obtained during the partial area scan are subtracted from the air values to convert .the intensity values to attenuation values. The approximate slope at either end of the truncated projection is then calculated. Based on the attenuation values and the slope the necessary extrapolation of the truncated projection is performed to complete the projection. No measurements, ionizing or otherwise, are required from the region outside of the small scan circle.The completed projection is ready for conventional reconstruction techniques involving convolution and backprojection.
Inventors:
DOMINIKU JIYUURIASU HIYUUSUCHI
Application Number:
JP16681480A
Publication Date:
July 20, 1981
Filing Date:
November 28, 1980
Export Citation:
Assignee:
TECHNICARE CORP
International Classes:
G06T11/00; A61B6/03; (IPC1-7): A61B6/02