METHOD FOR RECONSTITUTING IMAGE FROM MEASURED VALUE OBTAINED BY SPIRAL SCANNING OF EXAMINATION OBJECT BY USING CT APPARATUS AND CT INSTRUMENT FOR EXECUTING SUCH METHOD

摘要

PROBLEM TO BE SOLVED: To make it possible to arbitrarily set a layer sensitivity profile by subjecting the measured values obtain. by the spiral examination of a CT instrument having at least one row of detectors to two-dimensional spatial and time weighting. ;SOLUTION: An X-ray flux 3 converted to a pyramidal shape is emitted from an X-ray source 1. This flux penetrates an examination object 4 and falls onto the detectors 5. This examination object 4 is rotated around a system axis 6 so as to be penetrated and irradiated with the flux at various projection angles. A data detection system 7 forms the measured values in accordance with the output signals of the detectors 5 and sends these values to a calculator 8. This calculator 8 calculates the images of the inspection object 4 and displays these images on a monitor 9. At this time, the two-dimensional time weighting is executed by taking the spatial intervals from the image plane as well as the time intervals from reference projection into consideration. Further, the time weighting is additionally executed. The layer sensitivity profile may thus be arbitrarily set.;COPYRIGHT: (C)2000,JPO