Volumetric LAT map

Patent metadata

Field	Value
Publication number	US-11844619-B2
Application number	US-202318094470-A
Country	US
Kind code	B2
Filing date	Jan 9, 2023
Priority date	May 23, 2019
Publication date	Dec 19, 2023
Grant date	Dec 19, 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 locations in a model of tissue of a chamber of a heart, respective first values of a parameter, some of the first locations being on an endocardial surface of the tissue, and others of the first locations being on an epicardial surface of the tissue,
assign respective second values to second locations in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating values based on values assigned to respective neighbors of the second locations, 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 values based on values assigned to respective neighbors of the second locations by iteratively assigning, to each location of the second locations, an average of values assigned to immediate neighbors of the location.

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 values based on values assigned to respective neighbors of the second locations by, prior to iteratively assigning the average to each location of the second locations, assigning a respective initial value to each location of the second locations, 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 locations in a model of tissue of a chamber of a heart, respective first values of a parameter at respective locations on the tissue, some of the first locations being on an endocardial surface of the tissue, and others of the first locations being on an epicardial surface of the tissue; and
assigning respective second values to second locations in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating values based on values assigned to respective neighbors of the second locations.

11. The method according to claim 10 , wherein the parameter includes a property of the tissue.

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

13. The method according to claim 12 , 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.

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

15. The method according to claim 10 , wherein interpolating values based on values assigned to respective neighbors of the second locations iteratively assigning, to each voxel of the second voxels, an average of immediate neighbors of the voxel.

16. The method according to claim 15 , 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.

17. The method according to claim 15 , wherein interpolating values based on values assigned to respective neighbors of the second locations further comprises, prior to iteratively assigning the average to each location of the second locations, assigning a respective initial value to each location of the second locations, using any type of nearest neighbor interpolation.

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

19. 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 locations in a model of tissue of a chamber of a heart, respective first values of a parameter at respective locations on the tissue, some of the first locations being on an endocardial surface of the tissue, and others of the first locations being on an epicardial surface of the tissue, and
assign respective second values to second locations in the model, a subset of which represent a portion of the tissue between the endocardial surface and the epicardial surface, by interpolating values based on values assigned to respective neighbors of the second locations.

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

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

• A61B5/316 Primary

  Modalities, i.e. specific diagnostic methods · CPC title

• G06T7/0012

  Biomedical image inspection · CPC title

• G06T7/344

  involving models · CPC title