X-ray diagnostic apparatus, image processing apparatus, and image processing method

• US 10,631,806 B2
• Filed: 02/19/2016
• Issued: 04/28/2020
• Est. Priority Date: 02/19/2015
• Status: Active Grant

• Current Assignee: Canon Medical Systems Corporation (Canon Inc.)
• Original Assignee: Canon Medical Systems Corporation (Canon Inc.)
• Inventors: Nambu, Kyojiro
• Primary Examiner(s): Fernandez, Katherine L
• Assistant Examiner(s): Yang, Yi-Shan
• Application Number:
  US15/048,289
• Publication Number:
  US 20160242723A1
• Time in Patent Office: 1,530 Days
• Field of Search: None
• CPC Class Codes: A61B 6/4441 the rigid structure being a C-arm or U-arm
• CPC Class Codes: A61B 6/481 involving the use of contrast agents
• CPC Class Codes: A61B 6/504 for diagnosis of blood vessels, e.g. by angiography
• CPC Class Codes: A61B 6/5241 combining overlapping images of the same imaging modality, e.g. by stitching

Abstract

According to one embodiment, an X-ray diagnostic apparatus generating an X-ray image in a region of interest, includes a radiography device and processing circuitry. The radiography device takes a first X-ray image before injection of a contrast medium, and takes a second X-ray image and a third X-ray image after injection of the contrast medium. The processing circuitry generates an output image having pixel values that are ratios of pixel values between a difference between the second X-ray image and the first X-ray image and a difference between the third X-ray image and the first X-ray image.

Claims

1. An X-ray diagnostic apparatus generating an X-ray image in a region of interest, comprising:

a radiography device configured to take a first X-ray image before injection of a contrast medium, take a second X-ray image after the injection of the contrast medium and before a thrombectomy is performed, and take a third X-ray image after the injection of the contrast medium and after the thrombectomy is performed; and

processing circuitry configured to generate an output image having pixel values that are ratios of (1) a difference between pixels values of the second X-ray image and the first X-ray image, and (2) a difference between pixel values of the third X-ray image and the first X-ray image.

2. The X-ray diagnostic apparatus according to claim 1,

wherein the output image indicates a region where a bloodstream is recovered by the thrombectomy performed between the taking of the second X-ray image and the taking of the third X-ray image.

3. The X-ray diagnostic apparatus according to claim 2,

wherein the thrombectomy is performed multiple times, and

the processing circuitry is further configured to generate and update the output image for each time the thrombectomy is performed.

4. The X-ray diagnostic apparatus according to claim 1, further comprising:

a memory storing a first imaging position pertaining to an X-ray tube and an X-ray detector at a time of taking the first X-ray image, and

wherein the processing circuitry is further configured to move the X-ray tube and the X-ray detector to the first imaging position based on an instruction by a user.

5. The X-ray diagnostic apparatus according to claim 4, wherein the processing circuitry is further configured to

cause the memory to store the first X-ray image and the first imaging position of the X-ray tube and the X-ray detector with reference to a tabletop, at the time of taking the first X-ray image according to the instruction by the user through an input circuit;

and

move the X-ray tube and the X-ray detector to the first imaging position so as to cause the second X-ray image and the third X-ray image to be images from a viewpoint identical to that of the first X-ray image, at respective times of taking the second X-ray image and taking the third X-ray image, according to the instruction by the user through the input circuit.

6. The X-ray diagnostic apparatus according to claim 1,

wherein the radiography device is further configured to take the second X-ray image after a lapse of time during which the contrast medium is uniformly distributed across tissue after the injection of the contrast medium.

7. An image processing apparatus generating an X-ray image in a region of interest, comprising:

processing circuitry configured to

generate a first X-ray image based on an imaging before injection of a contrast medium, a second X-ray image based on an imaging after the injection of the contrast medium and before a thrombectomy is performed and a third X-ray image based on an imaging after the injection of the contrast medium and after the thrombectomy is performed; and

generate an output image having pixel values that are ratios of (1) a difference between pixel values of the second X-ray image and the first X-ray image, and (2) a difference between pixel values of the third X-ray image and the first X-ray image.

8. An image processing method of an image processing apparatus generating an X-ray image in a region of interest, the method comprising:

generating a first X-ray image based on an imaging before injection of a contrast medium, a second X-ray image based on an imaging after the injection of the contrast medium and before a thrombectomy is performed, and a third X-ray image based on an imaging after the injection of the contrast medium and after the thrombectomy is performed; and

generating an output image having pixel values that are ratios of (1) a difference between pixel values of the second X-ray image and the first X-ray image, and (2) a difference between pixel values of the third X-ray image and the first X-ray image.