Method and system for patient-specific modeling of blood flow

• US 9,078,564 B2
• Filed: 02/07/2014
• Issued: 07/14/2015
• 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:
  US14/175,119
• Publication Number:
  US 20140222406A1
• Time in Patent Office: 522 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 determining cardiovascular information for a patient, the system comprising:

at least one computer system configured to;

receive patient-specific data regarding a geometry of an anatomical structure of the patient, the anatomical structure including at least a portion of a plurality of coronary arteries emanating from the patient'"'"'s aorta;

create a three-dimensional model representing the anatomical structure using the patient-specific data;

estimate a mass or volume of myocardial tissue of the patient using one or both of the received patient-specific data and the created three-dimensional model;

create a blood flow model defining blood flow through the anatomical structure of the patient and modify the created blood flow model using, at least in part, a coronary blood flow associated with the estimated mass or volume of myocardial tissue of the patient; and

determine at least one blood flow characteristic within the anatomical structure using the three-dimensional model and the blood flow model.

2. The system of claim 1, wherein:

the at least one blood flow characteristic is chosen from blood velocity, blood pressure, and blood flow rate; and

the at least one computer system is configured to determine the at least one blood flow characteristic at a plurality of locations in the plurality of coronary arteries.

3. The system of claim 1, wherein the patient-specific data includes imaging data.

4. The system of claim 3, wherein the imaging data is provided by computer tomography or magnetic resonance imaging techniques.

5. The system of claim 3, wherein the at least one computer system is configured to create the three-dimensional model based on the imaging data by locating boundaries of lumens of at least the portion of the plurality of coronary arteries using the imaging data.

6. The system of claim 5, wherein the at least one computer system is configured to locate the boundaries based on changes in intensity values in the imaging data.

7. The system of claim 3, wherein the blood flow model includes at least one lumped parameter model representing a blood flow through boundaries of the three-dimensional model.

8. The system of claim 3, wherein the at least one computer system is configured to determine the at least one blood flow characteristic using a parameter associated with at least one of a level of hyperemia, a level of exercise, or a medication.

9. The system of claim 8, wherein the at least one computer system is configured to determine the at least one blood flow characteristic using a parameter associated with the level of hyperemia, and the parameter relates to a coronary artery resistance of the patient, an aortic blood pressure of the patient, or a heart rate of the patient.

10. The system of claim 3, wherein the at least one computer system is further configured to create the blood flow model based on at least one measured blood pressure of the patient.

11. The system of claim 10, wherein:

the patient-specific data includes imaging data; and

the mass or volume of myocardial tissue is determined based on the imaging data.

12. A computer-implemented method for determining patient-specific cardiovascular information using at least one computer system, the method comprising:

receiving, at the at least one computer system, patient-specific data regarding a geometry of an anatomical structure of the patient, the anatomical structure including at least a portion of a plurality of coronary arteries emanating from the patient'"'"'s aorta;

creating, using at least one computer system, a three-dimensional model representing the anatomical structure using the patient-specific data;

estimating a mass or volume of myocardial tissue of the patient using one or both of the received patient-specific data and the created three-dimensional model;

creating, using at least one computer system, a blood flow model defining blood flow through the anatomical structure of the patient and modifying the created blood flow model using, at least in part, a coronary blood flow associated with the estimated mass or volume of myocardial tissue of the patient; and

determining, using at least one computer system, at least one blood flow characteristic within the anatomical structure using the three-dimensional model and the blood flow model.

13. The method of claim 12, further comprising determining a location of a functionally significant narrowing in at least one of the plurality of coronary arteries based on the determined at least one blood flow characteristic.

14. The method of claim 12, wherein:

the at least one blood flow characteristic is chosen from blood velocity, blood pressure, and blood flow rate; and

the at least one blood flow characteristic is determined at a plurality of locations in the plurality of coronary arteries.

15. The method of claim 14, wherein the patient-specific data includes imaging data, and creating the three-dimensional model includes locating boundaries of lumens of the plurality of coronary arteries using the imaging data.

16. The method of claim 15, wherein the boundaries are located based on changes in intensity values in the imaging data.

17. A non-transitory computer readable medium for use on at least one computer system containing computer-executable programming instructions for performing a method for determining patient-specific cardiovascular information, the method comprising:

receiving patient-specific data regarding a geometry of an anatomical structure of the patient, the anatomical structure including at least a portion of a plurality of coronary arteries emanating from the patient'"'"'s aorta;

creating a three-dimensional model representing the anatomical structure using the patient-specific data;

estimating a mass or volume of myocardial tissue of the patient using one or both of the received patient-specific data and the created three-dimensional model;

creating a blood flow model defining blood flow through the anatomical structure of the patient and modifying the created blood flow model using, at least in part, a coronary blood flow associated with the estimated mass or volume of myocardial tissue of the patient; and

determining at least one blood flow characteristic within the anatomical structure using the three-dimensional model and the blood flow model.

18. The non-transitory computer readable medium of claim 17, the method further comprising:

preparing a three-dimensional simulation of at least the first portion of the anatomical structure, the three-dimensional simulation indicating the at least one blood flow characteristic at a plurality of locations in at least the portion of the plurality of coronary arteries along three dimensions.

19. The non-transitory computer readable medium of claim 18,

wherein the at least one blood flow characteristic is indicated on the three-dimensional simulation using colors or shading, and changes in the at least one blood flow characteristic are indicated by changes in color or shading.