Patent ID: 6072851
Filing Date: 2000-06-06
Classification: A61B,G06T,Y10S

Abstract:
A helical computerized tomography system in which an x-ray tube for radiating an x-ray and an object irradiated with the x-ray are relatively rotated with respect to each other, and the x-ray tube and the object are relatively moved along an axial direction of the object, thus performing a helical scan on the object, and the x-ray transmitted through the object is detected by an x-ray detector, thus reconstructing a tomograph at a desired position of a reference plane of reconstruction in the axial direction, said apparatus comprising:a radiation detector arrangement having first and second array of detectors disposed along the axial direction of the object for collecting transmitted data of the x-ray transmitted through the object during the helical scan;data extracting means for extracting first and second transmitted data each collected by said first and second arrays of detectors, the first and second transmitted data correspond to a same detector angle but different axial positions and the data extracting means extract one of the first and second transmitted data closer to the reference plane than the other;means for interpolating projection data based on the first and second transmitted data extracted by said data extracting means to produce interpolated projection data at the position of the reference plane; andreconstructing means for reconstructing a tomogram at the position of the reference plane based on the interpolated projection data obtained by said interpolating means.