Patent ID: 7050531
Filing Date: 2006-05-23
Classification: A61B,G06T,Y10S

Abstract:
1. A method for intraoperatively generating and updating a volume dataset, comprising the steps of: (a) before conducting a medical procedure involving a patient, acquiring a series of n 2D X-ray projections of biological tissue of the patient respectively at n different projection angles with an X-ray system, each of said projections having an associated projection geometry selected from the group consisting of known projection geometries and determinable projection geometries; (b) reconstructing a first volume dataset from said n 2D X-ray projections using said associated projection geometries; (c) after acquiring said series of 2D X-ray projections, intraoperatively acquiring m 2D X-ray projections of the patient during said medical procedure, from m different projection angles with said X-ray system, wherein m<n; (d) determining respective projection geometries for said intraoperatively acquired m 2D X-ray projections; (e) replacing m 2D X-ray projections in said series n 2D X-ray projections with said intraoperatively acquired m 2D X-ray projections, thereby leaving n−m 2D X-ray projections that were not replaced in said series of n 2D X-ray projections; and (f) reconstructing an updated volume dataset using said intraoperatively acquired m 2D X-ray projections and at least some of said n−m 2D X-ray projections.