Fast vascular reconstruction with MAP-EM method from few projections

It is necessary to know exactly the position and shape of blood vessels when radiation therapy is done for intracranial arteriovenous malformation. Various three-dimensional reconstruction methods for brain blood vessels have been proposed on the basis of clinical importance. But it is very difficult to accurately reconstruct blood vessels of complex shape from a few two-dimensional angiograms. Here, the authors used a MAP-EM method to reconstruct three-dimensional brain blood vessels from a few angiograms. Moreover, the authors decreased the calculation time by introducing a new penalty function in this MAP-FM method. As a result, a high quality image was obtained with a few iterations than with conventional iterative methods