Modeless motion binning in Cone Beam CT

We present the first results of a new technique to bin cone-beam projections without imposing any motion model. Such a technique is required for studying motion in regions of the body, such as the pelvis, where motion exists and is unpredictable. All motion information is obtained directly from the projections and the binning is performed through an exhaustive search of possible assignments. Simplifying assumptions using a proposed protocol change, coupled with dimensional reduction using Principal Component Analysis, make the method tractable.