Method and device for movement correction when imaging the heart

• US 20070092123A1
• Filed: 10/17/2006
• Published: 04/26/2007
• Est. Priority Date: 10/18/2005
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Popescu, Stefan
• Application Number:
  US11/581,361
• Publication Number:
  US 20070092123A1
• Time in Patent Office: Days
• US Class Current: 382/128
• CPC Class Codes: A61B 5/341 Vectorcardiography [VCG]
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/541 involving acquisition triggered by a physiological signal

Abstract

A method and a device are disclosed for movement correction when imaging the heart. In an embodiment of the method, a number of pictures of at least one region of the heart, that are subsequently combined with one another to generate a combined image data record, are recorded with the aid of an imaging unit in a space of time comprising a number of heart periods. In an embodiment of the method, an additional measuring device is used to acquire, during the recordings, measured data from which it is possible to calculate a variation in a spatial position of the heart between heart periods. The measured data are used to calculate the variation in the spatial position of the heart between the heart periods, in order to reduce errors in the image data record that are caused by the variation. The method, in an embodiment, renders possible combined image data records of the heart with reduced image artifacts.

Claims

1. A method for movement correction when imaging the heart, comprising:

recording a number of pictures of at least one region of the heart with the aid of an imaging unit in a space of time including a number of heart periods;

using, during the recordings, a measuring device to acquire measured data for producing vector cardiograms of the heart;

calculating, from the vector cardiograms of the heart, a variation in a spatial position and orientation of the heart between heart periods; and

combining the recorded pictures with one another to generate a combined image data record, the calculated variation being taken into account when combining the recorded pictures to at least reduce errors in the combined image data record previously caused by variation in the spatial position and orientation of the heart.

2. The method as claimed in claim 1, wherein the recorded pictures are combined with one another to produce a 3D image data record of the acquired region of the heart.

3. The method as claimed in claim 1, wherein the pictures are subjected to a movement correction in accordance with the calculated variation in the spatial position and orientation of the heart.

4. The method as claimed in claim 1, wherein arrhythmic heart periods are detected with the aid of abnormal QRS complexes by analyzing the vector cardiograms, no movement correction being carried out for pictures recorded in an arrhythmic heart period.

5. The method as claimed in claim 4, wherein pictures recorded in an arrhythmic heart period are rejected and are repeated in a later heart period.

6. The method as claimed in claim 1, wherein the determination is made for the vector cardiograms of two heart periods, as to whether the associated vector cardiograms can be at least approximately converted into one another by a linear transformation, a movement correction of the picture recorded in the later of the two heart periods being carried out on the basis of the calculated variation in the spatial position and orientation of the heart only in the case of a linear transformation.

7. The method as claimed in claim 6, wherein the later picture is rejected if the vector cardiograms cannot be transformed at least approximately into one another by a linear transformation.

8. The method as claimed in claim 1, wherein the pictures are respectively recorded in the same phase of the heart period by using at least one of an electro-cardiogram controller and vector cardiogram controller.

9. The method as claimed in claim 1, wherein the pictures are recorded by respectively using a respiratory controller in the same phase of the respiratory movement, the respiratory movement and a trigger signal for the respiratory controller being derived from the vector cardiograms.

19. The method as claimed in claim 2, wherein the pictures are subjected to a movement correction in accordance with the calculated variation in the spatial position and orientation of the heart.

20. The method as claimed in claim 1, wherein the pictures are subjected to at least one of displacement, tilting and individual rotating in an appropriate fashion, in accordance with the calculated variation in the spatial position and orientation of the heart.

21. The method as claimed in claim 2, wherein the pictures are subjected to at least one of displacement, tilting and individual rotating in an appropriate fashion, in accordance with the calculated variation in the spatial position and orientation of the heart.

25. A computer readable medium including program segments for, when executed on a computer device, causing the computer device to implement the method of claim 1.

10. A device, comprising:

one or more input interfaces for pictures, recorded with an imaging unit, of at least one region of the heart and for measured data, acquired with the measuring device, to produce vector cardiograms of the hearts; and

an evaluation device, the evaluation device including,

an analysis module to produce vector cardiograms of the heart from the measured data and to calculate therefrom a variation in a spatial position and orientation of the heart between heart periods, and

an image combination module to produce a combined image data recording by combining the recorded pictures by taking account of the calculated variation in the spatial position and orientation of the heart between in each case two heart periods, in which image data record errors in the image data record previously caused by the variation are at least reduced.

11. The device as claimed in claim 10, wherein the image combination module is designed to combine the pictures with one another to produce a 3D image data record of the acquired region of the heart.

12. The device as claimed in claim 10, wherein the image combination module is designed, in accordance with the calculated variation in the spatial position and orientation of the heart, to subject the pictures to a movement correction.

13. The device as claimed in claim 10, wherein the analysis module is designed to detect arrhythmic heart periods with the aid of abnormal QRS complexes by analyzing the vector cardiograms, the image combination module being designed to carry out no movement correction for pictures that have been recorded in an arrhythmic heart period.

14. The device as claimed in claim 13, wherein the image combination module does not include, in the combined image data record, pictures recorded in an arrhythmic heart period.

15. The device as claimed in claim 10, wherein the analysis module is designed to determine, for the vector cardiograms of two heart periods, whether the vector cardiograms can be at least approximately converted into one another by a linear transformation, the image combination module being designed to carry out a movement correction of the picture recorded in the later of the two heart periods on the basis of the calculated variation in the spatial position and orientation of the heart only in the case of a linear transformation.

16. The device as claimed in claim 15, wherein the image combination module is designed such that it does not include the later picture in the combined image data record if the vector cardiograms cannot be transformed at least approximately into one another by a linear transformation.

17. The device as claimed in claim 10, wherein the analysis module is designed to derive a vector cardiogram trigger signal from the vector cardiograms and provide the signal such that the pictures can be respectively recorded in the same phase of the heart period by using a vector cardiogram controller.

18. The device as claimed in claim 10, wherein the analysis module is designed to derive a respiratory trigger signal from the vector cardiograms and provides the signal such that the pictures can be respectively recorded in the same phase of the respiratory movement by using a respiratory controller.

22. The device as claimed in claim 11, wherein the image combination module is designed, in accordance with the calculated variation in the spatial position and orientation of the heart, to subject the pictures to a movement correction.

23. The device as claimed in claim 10, wherein the image combination module is designed, in accordance with the calculated variation in the spatial position and orientation of the heart, to at least one of displace, tilt and rotate the pictures individually in an appropriate fashion.

24. The device as claimed in claim 11, wherein the image combination module is designed, in accordance with the calculated variation in the spatial position and orientation of the heart, to at least one of displace, tilt and rotate the pictures individually in an appropriate fashion.