Method and system for patient-specific modeling of blood flow

• US 9,152,757 B2
• Filed: 10/23/2012
• Issued: 10/06/2015
• Est. Priority Date: 08/12/2010
• Status: Active Grant

• Current Assignee: Heartflow Inc.
• Original Assignee: Heartflow Inc.
• Inventors: Taylor, Charles A.
• Primary Examiner(s): Clow, Lori A
• Application Number:
  US13/658,755
• Publication Number:
  US 20130066618A1
• Time in Patent Office: 1,078 Days
• Field of Search: None
• US Class Current: 1/1
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Abstract

Embodiments include a system for determining cardiovascular information for a patient. The system may include at least one computer system configured to receive patient-specific data regarding a geometry of the patient'"'"'s heart, and create a three-dimensional model representing at least a portion of the patient'"'"'s heart based on the patient-specific data. The at least one computer system may be further configured to create a physics-based model relating to a blood flow characteristic of the patient'"'"'s heart and determine a fractional flow reserve within the patient'"'"'s heart based on the three-dimensional model and the physics-based model.

Claims

1. A system for providing a noninvasively derived fractional flow reserve and a computerized model of a portion of an anatomy of a patient, the system comprising:

at least one computer system configured to;

create a three-dimensional model representing at least a portion of multiple coronary arteries emanating from the patient'"'"'s aorta, using patient-specific imaging data derived from a noninvasive imaging source;

create a blood flow model representing blood flow through at least a portion of multiple coronary arteries;

create a multi-dimensional model using the three-dimensional model and the blood flow model;

determine a fractional flow reserve value for at least one location of the coronary arteries, using the multi-dimensional model and without using any invasive fractional flow reserve measurement technique; and

display the three-dimensional model and the determined fractional flow reserve value together on a display device.

2. The system of claim 1, wherein the at least one computer system is configured to determine multiple fractional flow reserve values, wherein each of the multiple fractional flow reserve values corresponds to a location of one of the coronary arteries, and wherein the at least one computer system is configured to provide the three-dimensional model and the multiple fractional flow reserve values for display together on the display device.

3. The system of claim 2, wherein the at least one computer system is configured to provide the three-dimensional model and the fractional flow reserve values such that each fractional flow reserve value is displayed, on the display device, overlying the coronary artery to which it corresponds.

4. The system of claim 3, wherein the at least one computer system is configured to determine multiple fractional flow reserve values for multiple locations within at least one of the coronary arteries, and wherein the multiple fractional flow reserve values in any one coronary artery overly a location in that artery where the fractional flow reserve value was determined.

5. The system of claim 1, wherein the at least one computer system is configured to provide additional patient-specific data via the display device, wherein the additional patient-specific data, the three-dimensional model and the fractional flow reserve value are displayed together on the display device.

6. The system of claim 5, wherein the additional patient-specific data are selected from the group consisting of heart rate, systemic blood pressure, aortic blood pressure, rate of blood flow through one or more blood vessels, patient identification, patient height, patient weight, patient BMI, patient age and patient gender.

7. The system of claim 5, wherein the at least one computer system is configured to provide at least one alternate view of the three-dimensional model on the display device in a small window near the three-dimensional model.

8. The system of claim 1, wherein the at least one computer system is configured to provide the three-dimensional model with each of the coronary arteries color coded to indicate the fractional flow reserve value determined by the computer system along a length of that coronary artery.

9. The system of claim 8, wherein the computer system is configured to provide the coronary arteries color coded according to a color spectrum, and wherein different colors in the spectrum correspond to different fractional flow reserve values.

10. The system of claim 9, wherein at least one of the coronary arteries is displayed having multiple colors corresponding to multiple fractional flow reserve values determined along the length of that at least one coronary artery.

11. The system of claim 8, wherein the at least one computer system is configured to display a color key via the display device at the same time the three-dimensional model is displayed, wherein the color key indicates multiple colors corresponding to the color coded coronary arteries and fractional flow reserve values that correspond to the multiple colors.

12. The system of claim 1, wherein the at least one computer system is configured to:

allow a user to position an indicator on a location of any of the coronary arteries of the three-dimensional model; and

display a fractional flow reserve value determined by the computer system for the location.

13. The system of claim 1, wherein the at least one computer system is configured to:

allow a user to select a representation of a stent or a bypass graft via the display device;

allow the user to indicate, using the display device, a location on one of the coronary arteries of the model for placement of the selected stent or bypass graft; and

determine a new fractional flow reserve value for a portion of the coronary artery at or near the indicated location.

14. The system of claim 13, wherein the at least one computer system is configured to widen the portion of the coronary artery on the model at or near the indicated location, based on placement of the stent or bypass graft.

15. The system of claim 1, wherein the noninvasive imaging source is selected from the group consisting of computed tomography and magnetic resonance imaging.

16. A method for providing a noninvasively derived fractional flow reserve value and a computerized model of a portion of an anatomy of a patient using at least one computer system, the method comprising:

creating, using the at least one computer system, a three-dimensional model representing at least a portion of multiple coronary arteries emanating from the patient'"'"'s aorta, using patient-specific imaging data derived from a noninvasive imaging source;

create a blood flow model representing blood flow through at least a portion of multiple coronary arteries;

create a multi-dimensional model using the three-dimensional model and the blood flow model;

determining, using the at least one computer system, a fractional flow reserve value within at least one of the coronary arteries based on the multi-dimensional model; and

displaying the three-dimensional model and the determined fractional flow reserve value together on a display device.

17. The method of claim 16, wherein creating the model comprises assigning colors to portions of the coronary arteries, wherein determining the fractional flow reserve value comprises determining multiple fractional flow reserve values in multiple coronary arteries of the model, and wherein the colors correspond with the determined fractional flow reserve values.

18. The method of claim 17, further comprising providing a color key to the user via the display device along with the model, wherein the color key indicates how the colors relate to different determined fractional flow reserve values.

19. The method of claim 18, wherein the colors comprise a color spectrum.

20. The method of claim 17, wherein at least one of the coronary arteries has multiple colors corresponding with multiple fractional flow reserve values determined along a length of the artery.

21. The method of claim 16, wherein determining the fractional flow reserve value comprises calculating a ratio between a pressure in the aorta and a pressure in one of the coronary arteries.

22. The method of claim 21, wherein determining the fractional flow reserve value comprises determining multiple fractional flow reserve values in at least one of the coronary arteries, wherein the multiple fractional flow reserve values are determined for different locations along a length of the at least one coronary artery.

23. The method of claim 22, wherein determining the fractional flow reserve value comprises determining multiple fractional flow reserve values in each of the coronary arteries of the multi-dimensional model.

24. The method of claim 16, further comprising receiving the patient specific imaging data, wherein the noninvasive imaging source is selected from the group consisting of computed tomography and magnetic resonance imaging.

25. The method of claim 16, further comprising:

allowing the user to indicate a location along any of the coronary arteries of the three-dimensional model, using a cursor or other indicator visible on the display device;

determining a fractional flow reserve value for the coronary artery at the indicated location; and

displaying the determined fractional flow reserve value for the indicated location.

26. The method of claim 16, further comprising:

allowing the user to indicate a location on one of the coronary arteries of the model where at least one of a stent or a bypass graft may be placed, using a cursor or other indicator visible on the display device;

determining a new fractional flow reserve value for a portion of the coronary artery at or near the indicated location; and

displaying the new fractional flow reserve value on the display device.

27. A non-transitory computer readable medium for use on at least one computer system containing computer-executable programming instructions for performing a method for providing a noninvasively derived fractional flow reserve value and a computerized model of a portion of an anatomy of a patient, the method comprising:

receiving patient-specific imaging data representing at least a portion of multiple coronary arteries emanating from the patient'"'"'s aorta, wherein the data is derived from a noninvasive imaging source;

creating, using the at least one computer system, a three-dimensional model representing at least the portion of the patient'"'"'s aorta and the multiple coronary arteries, using the patient-specific imaging data;

creating a blood flow model representing blood flow through at least a portion of multiple coronary arteries;

create a multi-dimensional model using the three-dimensional model and the blood flow model;

determining, using the at least one computer system, at least one fractional flow reserve value for each of the coronary arteries of the multi-dimensional model; and

displaying the three-dimensional model and the at least one fractional flow reserve value determined for each of the coronary arteries together on a display device.

28. The non-transitory computer readable medium of claim 27, the method further comprising determining multiple fractional flow reserve values for each of the coronary arteries of the multi-dimensional model, wherein the multiple fractional flow reserve values are determined at different locations along a length of at least one of the coronary arteries, and wherein all of the determined fractional flow reserve values determined for the coronary arteries of the multi-dimensional model are provided together with the three-dimensional model on the display.

29. The non-transitory computer readable medium of claim 27, wherein the three-dimensional model and fractional flow reserve values are provided such that each of the fractional flow reserve values lies on top of a portion of a corresponding coronary artery at which it was determined.

30. The non-transitory computer readable medium of claim 27, the method further comprising providing additional patient-specific data via the display device, wherein the additional patient-specific data, the three-dimensional model and the fractional flow reserve value are displayed together on the display device.

31. The non-transitory computer readable medium of claim 30, the method further comprising providing at least one alternate view of the three-dimensional model on the display device in a small window near the three-dimensional model.

32. The non-transitory computer readable medium of claim 30, wherein the three-dimensional model is provided with each of the coronary arteries color coded to indicate the fractional flow reserve value determined by the computer system along a length of that coronary artery.

33. The non-transitory computer readable medium of claim 32, wherein the coronary arteries are color coded according to a color spectrum, and wherein different colors in the spectrum correspond to different fractional flow reserve values.

34. The non-transitory computer readable medium of claim 32, wherein at least one of the coronary arteries has multiple colors corresponding with multiple fractional flow reserve values determined along the length of that at least one coronary artery.

35. The non-transitory computer readable medium of claim 27, the method further comprising providing a color key to the user via the display device at the same time the three-dimensional model is displayed, wherein the color key indicates multiple colors corresponding to the color coded coronary arteries and fractional flow reserve values that correspond to the multiple colors.