Medical image processing apparatus and medical image processing method

• US 10,043,267 B2
• Filed: 06/02/2015
• Issued: 08/07/2018
• Est. Priority Date: 06/02/2014
• Status: Active Grant

• Current Assignee: Toshiba Medical Systems Corporation (Canon Inc.)
• Original Assignee: Toshiba Medical Systems Corporation (Canon Inc.)
• Inventors: Yamamori, Kyohei, Wakai, Satoshi, Ozaki, Masahiro
• Primary Examiner(s): Thomas, Mia M
• Application Number:
  US14/728,049
• Publication Number:
  US 20150348263A1
• Time in Patent Office: 1,162 Days
• CPC Class Codes: G06T 2207/10081 Computed x-ray tomography [CT]
• CPC Class Codes: G06T 2207/30048 Heart; Cardiac
• CPC Class Codes: G06T 2207/30101 Blood vessel; Artery; Vein; Vascular
• CPC Class Codes: G06T 7/0012 Biomedical image inspection

Abstract

A method and apparatus is provided for medical image processing. The processing of the medical image extracting a living valve image by analyzing a 3D image of an anatomical organ of a subject, specifying a distribution of an amount of calcium in the living valve image from CT pixel values in the living valve image, and specifying a distribution of difficulty levels of implanting an artificial valve to the anatomical organ based on a comparison between the amount of calcium and a predetermined value.

Claims

1. A medical image processing apparatus comprising:

processing circuitry configured to;

extract a living valve image by analyzing 3D image data related to an anatomical part of a subject;

specify a distribution of an amount of calcium in the living valve image from CT values of pixels in the living valve image;

calculate a distribution of difficulty levels of implanting an artificial valve to the anatomical part in the living valve image based on a comparison between the amount of calcium and a predetermined set value;

extract a vessel slice related to the living valve by analyzing the 3D image data;

calculate a distribution of calcium in the vessel wall of the vessel slice from CT values of pixels in the vessel slice; and

calculate a distribution of implantation difficulty levels for an artificial valve in the vessel wall.

2. The medical image processing apparatus of claim 1, wherein the processing circuitry is further configured to:

divide the living valve image and the vessel wall into a plurality of regions, and

calculate the amount of calcium for each of the plurality of regions.

3. The medical image processing apparatus of claim 2, wherein the processing circuitry is further configured to

divide the living valve image into contour-line shaped regions from a region near the vessel wall to the vessel core line.

4. The medical image processing apparatus of claim 3, wherein the processing circuitry is further configured to

divide the region-divided living valve image into a plurality of lobes constituting the living valve.

5. The medical image processing apparatus of claim 2, wherein the processing circuitry is further configured to

divide the living valve image radially with respect to a vessel core line.

6. The medical image processing apparatus of claim 5, wherein the processing circuitry is further configured to

divide the region-divided living valve image into a plurality of lobes constituting the living valve.

7. The medical image processing apparatus of claim 1, wherein the processing circuitry is further configured to

extract a plurality of vessel slices in the direction of a vessel core line from the vessel slice and the living valve image, and

radially divide the vessel wall in each of the vessel slices with respect to the vessel core line.

8. The medical image processing apparatus of claim 1, wherein the anatomical part is a heart, the vessel is an aorta, and the living valve is an aortic valve.

9. The medical image processing apparatus of claim 1, wherein the processing circuitry is further configured to:

generate a mapping image in which a color corresponding to the implantation difficulty level is mapped to each of the pixels of the living valve image, and

the apparatus further comprises a display which displays an image obtained by superimposing the mapping image on the living valve image.

10. A medical image processing method comprising:

extracting a living valve image by analyzing 3D image data related to an anatomical part of a subject;

specifying a distribution of an amount of calcium in the living valve image from a CT value of each pixel in the living valve image;

calculating a distribution of difficulty levels of implanting an artificial valve to the anatomical part in the living valve image based on a comparison between the amount of calcium and a predetermined set value; and

extracting a vessel slice related to the living valve by analyzing the 3D image data, wherein

the step of specifying the distribution of the amount of calcium in the living valve image includes calculating a distribution of calcium in the vessel wall of the vessel slice from CT values of pixels in the vessel slice,

the step of calculating the distribution of difficulty levels of implanting the artificial valve includes calculating a distribution of implantation difficulty levels for an artificial valve in the vessel wall.

11. The medical image processing method of claim 10, further comprising

dividing the living valve image and the vessel wall into a plurality of regions, wherein

the step of specifying the distribution of the amount of calcium in the living valve image includes calculating the amount of calcium for each of the plurality of regions.

12. The medical image processing method of claim 11, wherein the step of dividing the living valve image and the vessel wall into the plurality of regions includes dividing the living valve image into contour-line shaped regions from a region near the vessel wall to the vessel core line.

13. The medical image processing method of claim 12, wherein the step of dividing the living valve image and the vessel wall into the plurality of regions includes further dividing the region-divided living valve image into a plurality of lobes constituting the living valve.

14. The medical image processing method of claim 11, the step of dividing the living valve image and the vessel wall into the plurality of regions includes radially dividing the living valve image with respect to the vessel core line.

15. The medical image processing method of claim 14, wherein the step of dividing the living valve image and the vessel wall into the plurality of regions includes further dividing the region-divided living valve image into a plurality of lobes constituting the living valve.

16. The medical image processing method of claim 10, wherein

the step of extracting the vessel slice includes extracting a plurality of vessel slices in the direction of a vessel core line from the vessel slice and the living valve image, and

the step of dividing radially the living valve image with respect to the vessel core line includes dividing the vessel wall of each of the vessel slices with respect to the vessel core line.

17. The medical image processing method of claim 10, wherein the anatomical part is a heart, the vessel is an aorta, and the living valve is an aortic valve.

18. The medical image processing method of claim 10, further comprising:

generating a mapping image in which a color corresponding to the implantation difficulty level is mapped to each of the pixels of the living valve image; and

superimposing the mapping image onto the living valve image.