Reconstruction of computed tomography images using an interpolation between projection views

摘要

An approach to image reconstruction provides enhanced image quality from limited projection data, particularly when the imaging object (or a portion of interest) is in motion during the tomographic projection data collection process. An interpolated projection view is generated from existing projection views between which an additional relationship exists by virtue of being respectively based on data collected in different data acquisition cycles. The existing projection views may represent an imaging object in consecutive data acquisition cycles or in separated data acquisition cycles or in both. The present invention provides a technique for combining the existing projection views into an interpolated projection view by interpolation in time. A further aspect of the invention provides an approach for selecting a reconstruction range for projection data representing the imaged object and covering a plurality of projection ranges. The disclosed approach allows a separation measure to be determined for the projection data for each reconstruction range. The selected reconstruction range is chosen based on the separation measures. Particular advantages are thereby obtained for cardiac imaging.