Method and apparatus of cone beam CT dynamic imaging

摘要

A cone-beam scanning system scans along a half circle. The reconstruction uses a weighting function which decreases for rows farther from the scan plane to take the redundancy of the projection data into account. Another embodiment uses a circle plus sparse helical scan geometry. Image data can be taken in real time.

主权项

1. A method for forming a cone beam reconstruction image of an object, the method comprising:
(a) performing a cone-beam scan of the object by using a cone-beam emitter and a detector to perform a circle plus sparse spiral scanning geometry or partial circle plus sparse spiral scanning geometry so as to obtain projection data, wherein the sparse spiral scanning consists of acquiring eight projections at points during helical scanning which covers an angular range of 4π; and (b) forming the cone beam reconstruction image from the projection data.