Dual-energy cone-beam CT scanning

摘要: To integrate dual energy CT techniques into a cone-beam unit operating as part of radiotherapy apparatus, we describe scanning apparatus comprising gantry, rotateable about an axis rotation, x-ray source mounted on the gantry at location offset from and capable emitting x-radiation selected one least two different energies, detector for source, opposite thereby to detect x-rays after attenuation by investigative subject located substantially angular encoder detecting position control with over rotation operation able receive information encoder, wherein is arranged cause first trigger emit when reports that each plurality predetermined locations, second differing same locations. An image processing means receives projection images reconstructs them volumetric image. A support couch provided patient, minimise likelihood movement artefacts, comprises patient immobilisation system such evacuatable bead bag, bite post, or stereotactic frames, like.