Volumetric LAT map

Patent metadata

Field	Value
Publication number	US-11564610-B2
Application number	US-202016817537-A
Country	US
Kind code	B2
Filing date	Mar 12, 2020
Priority date	May 23, 2019
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A method includes assigning, to first voxels in a model of tissue of a chamber of a heart, respective first values of a parameter at respective locations on the tissue, the first voxels representing the locations, respectively. Some of the locations are on an endocardial surface of the tissue, and others of the locations are on an epicardial surface of the tissue. The method further includes assigning respective second values to second voxels in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating the first values. Other embodiments are also described.

First claim

The invention claimed is:

1. A system, comprising:
a monitor; and
a processor, configured to:
assign, to first voxels in a model of tissue of a chamber of a heart, respective first values of a parameter at respective locations on the tissue,
the first voxels representing the locations, respectively, and
some of the locations being on an endocardial surface of the tissue, and others of the locations being on an epicardial surface of the tissue,

assign respective second values to second voxels in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating the first values, and
display the model on the monitor.

2. The system according to claim 1 , wherein the parameter includes a property of the tissue.

3. The system according to claim 2 , wherein the property includes a local activation time (LAT).

4. The system according to claim 3 , wherein the processor is further configured to:
identify, based on the first values and the second values, at least one region of decelerating electrical propagation, and
generate an output indicating the region.

5. The system according to claim 1 , wherein the parameter includes an amount of energy delivered to the tissue.

6. The system according to claim 1 , wherein the processor is configured to interpolate the first values by iteratively assigning, to each voxel of the second voxels, an average of immediate neighbors of the voxel.

7. The system according to claim 6 , wherein the processor is configured to assign the average by assigning a weighted average in which the immediate neighbors are weighted by respective weights, which are derived from respective levels of confidence associated with the first values.

8. The system according to claim 6 , wherein the processor is configured to interpolate the first values by, prior to iteratively assigning the average to each voxel of the second voxels, assigning a respective initial value to each voxel of the second voxels, using any type of nearest neighbor interpolation.

9. The system according to claim 1 , wherein the processor is configured to display the model so as to indicate those of the second values assigned to the subset.

10. A method, comprising:
assigning, to first voxels in a model of tissue of a chamber of a heart, respective first values of a parameter at respective locations on the tissue,
the first voxels representing the locations, respectively, and
some of the locations being on an endocardial surface of the tissue, and others of the locations being on an epicardial surface of the tissue; and
assigning respective second values to second voxels in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating the first values.

11. The method according to claim 10 , wherein the property includes a local activation time (LAT).

12. The method according to claim 11 , further comprising:
based on the first values and the second values, identifying at least one region of decelerating electrical propagation; and
generating an output indicating the region.

13. The method according to claim 10 , wherein the parameter includes an amount of energy delivered to the tissue.

14. The method according to claim 10 , wherein interpolating the first values comprises interpolating the first values by iteratively assigning, to each voxel of the second voxels, an average of immediate neighbors of the voxel.

15. The method according to claim 14 , wherein assigning the average comprises assigning a weighted average in which the immediate neighbors are weighted by respective weights, which are derived from respective levels of confidence associated with the first values.

16. The method according to claim 14 , wherein interpolating the first values further comprises, prior to iteratively assigning the average to each voxel of the second voxels, assigning a respective initial value to each voxel of the second voxels, using any type of nearest neighbor interpolation.

17. The method according to claim 10 , further comprising displaying the model so as to indicate those of the second values assigned to the subset.

18. A computer software product comprising a tangible non-transitory computer-readable medium in which program instructions are stored, which instructions, when read by a processor, cause the processor to:
assign, to first voxels in a model of tissue of a chamber of a heart, respective first values of a parameter at respective locations on the tissue,
the first voxels representing the locations, respectively, and
some of the locations being on an endocardial surface of the tissue, and others of the locations being on an epicardial surface of the tissue, and

assign respective second values to second voxels in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating the first values.

19. The computer software product according to claim 18 , wherein the parameter includes a local activation time (LAT) of the tissue.

20. The system according to claim 1 , wherein the processor is configured to assign, to first voxels in the model of tissue of the chamber of the heart, respective first values of the parameter at respective locations on the tissue based on:
determine positions of a distal end of a catheter based on signals from one or more electromagnetic sensors disposed at the distal end of the catheter; and
determine the respective first values of the parameter based on signals generated by one or more additional sensors disposed at the distal end of the catheter.

Assignees

• Biosense Webster Israel Ltd

Inventors

• Zar Lior
• Cohen Benjamin
• Katz Natan Sharon
• Turgeman Aharon
• Kadoshi Yaron

Classifications

• A61B5/339

  Displays specially adapted therefor · CPC title

• A61B5/367 Primary

  Electrophysiological study [EPS], e.g. electrical activation mapping or electro-anatomical mapping · CPC title

• G06T7/0012

  Biomedical image inspection · CPC title

• G06T7/344

  involving models · CPC title

• A61B5/4836

  Diagnosis combined with treatment in closed-loop systems or methods (A61B5/0036 takes precedence) · CPC title