Patent ID: 8331526

Claim:
An imaging system for an object exhibiting internal periodic motion comprising; a source of penetrating radiation and a two-dimensional detector for the radiation, the source and the detector being rotatable around an axis lying on the beam path from the source to the detector a storage means for images obtained from the detector a control means for initiating rotation of the source and the detector and for obtaining images from the detector at a plurality of rotation angles over time and for placing images in the storage means a processing means for condensing the images in a direction transverse to an axis to produce a one-dimensional image collating the one-dimensional images obtained to produce a two dimensional image analysing the two-dimensional image thus obtained to identify periodic patterns allocating phase information to the images in the storage means on the basis of that analysis selecting images in the storage means having like phase information backprojecting the selected images the control means being adapted to invoke the processing means after a plurality of images have been placed in the storage means and whilst further images are being obtained and stored, and then to place further images in the storage means and further to invoke the processing means.