Patent ID: 11436765

Abstract:
Methods and systems for computed tomography provide advances in efficiency. The methods operating within the parallel-beam geometry, rather than a divergent beam geometry, for the majority of the operations. In back projection methods perform digital image coordinate transformations on selected intermediate-images, the parameters of one or more coordinate transformations being chosen such that Fourier spectral support of the intermediate-image is modified so that a region of interest has an increased extent along one or more coordinate direction and the aggregates of the intermediate-images can be represented with a desired accuracy by sparse samples. Forward projection methods perform digital image coordinate transformations on an input image to produce multiple intermediate-images, the parameters of one or more coordinate transformations being chosen such that Fourier spectral support of an intermediate-image being produced is modified so that a region of interest has a reduced extent along one or more coordinate direction and the intermediate-images can be represented with a desired accuracy by sparse samples.