Method and device for medical image reconstruction

• US 20050220264A1
• Filed: 03/24/2005
• Published: 10/06/2005
• Est. Priority Date: 03/31/2004
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Homegger, Joachim
• Application Number:
  US11/089,251
• Publication Number:
  US 20050220264A1
• Time in Patent Office: Days
• US Class Current: 378/8
• CPC Class Codes: A61B 6/4441 the rigid structure being a C-arm or U-arm
• CPC Class Codes: A61B 6/466 adapted to display 3D data
• CPC Class Codes: A61B 6/469 for selecting a region of interest [ROI]
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal
• CPC Class Codes: G06T 11/005 Specific pre-processing for tomographic reconstruction, e.g. calibration, source positioning, rebinning, scatter correction, retrospective gating

Abstract

The present invention relates to an image reconstruction device (12) for an X-ray apparatus and a method for local 3D reconstruction of an object area of an examination object (7) from 2D image data of several 2D X-ray images of the examination object (7) registered in chronological order with different known projection geometries using the X-ray apparatus. With the method a location in the object area under consideration is selected from one of the 2D X-ray images. The positions of the selected location are determined in at least some of the 2D X-ray images and a spatial motion of the selected location between the registrations of the 2D X-ray images is calculated from the positions obtained, taking the known projection geometries into consideration. The calculated motion is then annulled by modifying the 2D image data in the 2D X-ray images and a 3D image dataset of at least the object area is reconstructed from the modified 2D image data. The method and the image reconstruction device enable a 3D image of a moving locally bounded object area to be reconstructed in a simple way without motion artifacts.

Claims

1-12. -12. (canceled)

13. A method of reconstructing a medical three-dimensional image of an object area of an examination object using two-dimensional image data, comprising:

recording a plurality of two-dimensional images of the examination object in chronological order using an x-ray device, the two-dimensional images having different projection geometries;

determining a movement of a sub-area included in the object area while recording the two-dimensional images;

compensating for the determined movement by modifying the two-dimensional image data included in the two-dimensional images; and

reconstructing a three-dimensional image of the object area using the modified two-dimensional image data, wherein the determining of the movement of the sub-area includes;

identifying the sub-area in one of the two-dimensional images,

determining a number of positions of the sub-area within a number of two-dimensional images other than the one two-dimensional image, and

calculating the movement of the sub-area using the determined number of positions and the projection geometries.

14. The method according to claim 13, wherein determining the number of positions includes applying a pattern recognition algorithm.

15. The method according to claim 13, wherein the object area and the sub-area are determined by an image processing algorithm based on a set of user-definable selection parameters.

16. The method according to claim 13, wherein the sub-area is a central location of the object area.

17. The method according to claims 13, wherein the sub-area is a striking location of the object area.

18. The method according to claim 13, wherein modifying the two-dimensional image data includes displacing image pixels of the two-dimensional images.

19. The method according to claims 13, wherein modifying the two-dimensional image data includes enlarging or reducing an image area of at least one of the two-dimensional images for adjusting the projection geometry of the two-dimensional image.

20. The method according to claim 13, wherein the x-ray device comprises a C-arm, and the two-dimensional images are recorded at different positions of the C-arm.

21. The method according to claim 13, wherein the object area is a heart, and the three-dimensional image visualizes a cardiac stenosis.

22. A device for medical image reconstruction for use with an X-ray device, comprising:

an image processing unit for reconstructing a three-dimensional image of an object area of an examination object using two-dimensional image data included in a plurality of two-dimensional images of the examination object, the two-dimensional images recorded by the X-ray device in chronological order and having different projection geometries;

an object tracking unit for determining a number of positions of a sub-area of the object area within a number of the two-dimensional images and for calculating a movement of the sub-area during the recording of the two-dimensional images using the determined positions and the projection geometries; and

a correction unit for compensating for the calculated movement by modifying the two-dimensional image data, the correction unit operatively connected to the image processing, wherein the image processing unit is configured to reconstruct the three-dimensional image using the modified two-dimensional image data.

23. The device according to claim 22, further comprising a detection unit for determining the object area or the sub-area based on an image processing algorithm and a set of user-definable selection parameters.

24. The device according to claim 23, wherein the object area is a stenosis of an organ and the detection module unit is configured to detect the stenosis.