Weighted hybrid cone beam reconstruction for circular trajectories

In cone beam computer tomography circular detector trajectories will be one of the standard for projection data acquisition. To achieve a high volume coverage when using these projection data a hybrid cone beam reconstruction technique has been recently introduced. This technique combines the ideas of fan-beam to parallel-beam rebinning for cone beam geometries and a height rebinning in a rectangular virtual detector window to a simple and efficient back projection algorithm. Using this data reorganization a hybrid reconstruction technique can be applied which is based on a combination of full-scan and half-scan reconstruction in a cylindrical reconstruction volume of maximum size for a given radius of the field of view. The introduction of weighted half scan techniques into this framework leads to a decreased cone beam artifact level while keeping the optimal ratio between the reconstructible and irradiated volume of the scanned volume