| 摘要 |
<p>4D (=3D+time) soft tissue reconstructions of the heart using c-arm systems, is becomingan important topic. This invention disclosure addresses a simple and robust technique that provides significantly better 4D (time resolved 3D) image quality than conventional techniques. Forward projection of a non gated reconstruction is used to create a4D reconstruction in a second reconstruction pass that suffers very much less from streak artefacts than conventional (gated) 4D reconstruction. It also has much less noise, since more of the projections are used for each reconstruction. The improved image quality has significant benefits when it comes to segmentation or visual identification of the anatomy of the heart. Since recently, extremely fast forward and backprojection is available on cheap graphics cards.</p> |
