SPATIAL DISTORTION CORRECTION METHOD AND APPARATUS FOR SCINTILLATION CAMERAS

摘要

A method and apparatus for correcting for the spatial distortions of scintillation cameras or similar image forming apparatus. The distortion correction method accurately and precisely determines distortion correction factors in an off-line test measurement and analysis phase prior to actual on-line diagnostic use. The distortion correction factors are initially determined from image event data that is obtained during the test measurement phase by orthogonal line pattern images. Data from a uniform field flood image is also utilized during the test measurement phase to refine and modify the distortion correction factors utilizing the gradient of a function of the field flood image data. Scintillation camera image repositioning apparatus is provided and includes a memory having the correction factors stored therein in a predetermined array. During the on-line use of the scintillation camera and associated image display system, the image repositioning apparatus transforms the data from the scintillation camera in accordance with the stored distortion correction factors. In a preferred arrangement, the image event data is repositioned or corrected event by event.