Method for intraoperative generation of an updated volume data set
First Claim
1. A method for intraoperatively generating and updating a volume dataset, comprising the steps of:
- (a) acquiring a series of n 2D x-ray projections of biological tissue, in an initial position, of a 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, said n 2D x-ray projections forming a volume dataset for said biological tissue;
(b) reconstructing image information of said volume dataset representing said biological tissue from said n 2D x-ray projections using said associated projection geometries;
(c) after a positional change of said biological tissue, intraoperatively acquiring a series of m 2D x-ray projections of said biological tissue respectively at m different projection angles with said x-ray system, wherein m <
n, said m 2D x-ray projections forming a further volume dataset;
(d) for each of said intraoperatively acquired m 2D x-ray projections, obtaining an associated projection geometry;
(e) segmenting image information of said further volume dataset so that a 2D contour of the biological tissue is present in each of said m 2D x-ray projections; and
(f) using the respective projection geometries obtained in step (d) back-projecting said 2D contours that are segmented in the respective m 2D x-ray projections into the image information of said volume dataset reconstructed in step (d), to produce an updated volume dataset containing a 3D contour of said biological tissue after said position change.
2 Assignments
0 Petitions
Accused Products
Abstract
To intraoperatively generate an updated volume data set in which a image information of biological tissue is volume data set representing reconstructed from a series of n 2D biological tissue x-ray projections, one version, in intraoperatively acquired m 2D biological tissue x-ray projections the biological tissue 2D contour is segmented and this is back-projected in the reconstructed volume data set. In another version, in the volume data set the biological tissue 3D contour is segmented and this is projected in intraoperatively acquired m biological tissue 2D x-ray projections. The 3D contour is visually repositioned by projection in the m 2D x-ray projections in the volume data set, until its projection is substantially congruent with the biological tissue image information in the respective 2D x-ray projections. In both versions, a volume data set updated around the intraoperatively determined biological tissue 3D contour is generated.
-
Citations
22 Claims
-
1. A method for intraoperatively generating and updating a volume dataset, comprising the steps of:
-
(a) acquiring a series of n 2D x-ray projections of biological tissue, in an initial position, of a 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, said n 2D x-ray projections forming a volume dataset for said biological tissue;
(b) reconstructing image information of said volume dataset representing said biological tissue from said n 2D x-ray projections using said associated projection geometries;
(c) after a positional change of said biological tissue, intraoperatively acquiring a series of m 2D x-ray projections of said biological tissue respectively at m different projection angles with said x-ray system, wherein m <
n, said m 2D x-ray projections forming a further volume dataset;
(d) for each of said intraoperatively acquired m 2D x-ray projections, obtaining an associated projection geometry;
(e) segmenting image information of said further volume dataset so that a 2D contour of the biological tissue is present in each of said m 2D x-ray projections; and
(f) using the respective projection geometries obtained in step (d) back-projecting said 2D contours that are segmented in the respective m 2D x-ray projections into the image information of said volume dataset reconstructed in step (d), to produce an updated volume dataset containing a 3D contour of said biological tissue after said position change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method for intraoperatively generating and updating a volume dataset, comprising the steps of:
-
(a) acquiring a series of n 2D x-ray projections of biological tissue, in an initial position, of a 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, said n 2D x-ray projections forming a volume dataset for said biological tissue;
(b) reconstructing image information of said volume dataset representing said biological tissue from said n 2D x-ray projections using said associated projection geometries;
(c) segmenting image information in said volume dataset of said biological tissue to produce a 3D contour of said biological tissue in said volume dataset;
(d) after a positional change of said biological tissue, intraoperatively acquiring a series of m 2D x-ray projections of said biological tissue respectively at m different projection angles with said x-ray system, wherein m<
n, said m 2D x-ray projections forming a further volume dataset;
(e) for each of said intraoperatively acquired m 2D x-ray projections, obtaining an associated projection geometry;
(f) projecting said 3D contour of said biological tissue that was segmented in step (c) in said volume dataset into each of said m 2D x-ray projections acquired in step (d);
(g) repositioning the 3D contour of the biological tissue that is segmented in aid volume dataset until said 3D contour projected into each of said end 2D x-ray projections is substantially congruent with image information of said biological tissue in the respective m 2D x-ray projections; and
(h) supplementing said volume dataset with a further 3D contour visually representing said position change of said biological tissue, to produce an updated volume dataset. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
Specification