Computerised X=ray tomograph with fantail beam and optional filter - matches integration and read-out within detector element group to rotation of source

摘要

A third generation computerised tomograph has a source (2) which moves with constant angular velocity in a circular locus (1) about the axis (8) and whose radiation is focused to generate a fantail beam (3). A similarly moving curved detector array (4) is divided into elements (7) which enable the data fibre objects in an area (5) to be examined in groups. A filter formed by alternate metal plates (9) provides energy spectrum for image reconstruction in an alternative mode. The data acquisition system is time referenced by the polar parameters (phi,psi) such that signals are simultaneously integrated within each element (7) and their respective resultants presented for visual imaging in a time sequence matched to the angular velocity of scanning. USE/ADVANTAGE - Enables optimisation of image quality in terms of positional resolution and contrast to any given exposure time. Efficient scanning of object provides data tractable to recent developments in numerical analysis and sampling for image enhancement. Provides alternative to, or support for, spring-focus technique and filter further extends range of selectable scanning modes.