Apparatus and method for reconstructing tomography images using motion information

Patent metadata

Field	Value
Publication number	US-10307129-B2
Application number	US-201615228530-A
Country	US
Kind code	B2
Filing date	Aug 4, 2016
Priority date	Aug 27, 2015
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

Provided is a tomography apparatus including: a data acquisitor configured to obtain a first image by using tomography data acquired as a first X-ray generator for generating X-rays having a first energy rotates around an object over a first angular range and obtain a second image by using tomography data acquired as a second X-ray generator for generating X-rays having a second energy rotates around the object over a second angular range; a controller configured to acquire motion information representing an amount of motion of the object over time by using the first and second images; and an image reconstructor configured to reconstruct a target image showing the object at a target time point by using the motion information.

First claim

What is claimed is:

1. A tomography apparatus comprising at least one processor configured to:
obtain a first image using first tomography data acquired as a first X-ray generator for generating X-rays having a first energy rotates around an object over a first angular range, and to obtain a second image using second tomography data acquired as a second X-ray generator for generating X-rays having a second energy rotates around the object over a second angular range different from the first angular range;
determine motion information representing an amount of motion of the object over time using the first image and the second image; and
reconstruct a target image showing the object at a target time point using the motion information.

2. The tomography apparatus of claim 1 , wherein the first image and the second image are partial images, and the first angular range is opposite to the second angular range.

3. The tomography apparatus of claim 1 , wherein each of the first angular range and the second angular range is less than 180 degrees.

4. The tomography apparatus of claim 1 , wherein the motion information comprises information representing an amount of motion of a surface forming the object.

5. The tomography apparatus of claim 1 , wherein the at least one processor is further configured to predict an amount of motion of the object at the target time point based on the motion information, and to reconstruct the target image based on the predicted amount of motion.

6. The tomography apparatus of claim 1 , wherein the at least one processor is further configured to acquire two pieces of tomography data corresponding to an angular range of 180 degrees and an extra angle by respectively using the first x-ray generator and the second X-ray generator,
wherein the extra angle is in a range of 30 degrees to 70 degrees.

7. The tomography apparatus of claim 1 , wherein the at least one processor is further configured to reconstruct the target image based on a first reconstructed image and a second reconstructed image, the first reconstructed image and the second reconstructed image being generated based on the first tomography data and the second tomography data acquired during the rotation of the first x-ray generator and the second X-ray generator using the motion information.

8. The tomography apparatus of claim 7 , wherein the at least one processor is further configured to reconstruct the target image by performing image registration between the first reconstructed image and the second reconstructed image.

9. A tomography apparatus comprising at least one processor configured to:
obtain a first partial image using first tomography data acquired as a first X-ray generator for generating X-rays having a first energy and a second X-ray generator for generating X-rays having a second energy rotate around an object over a first angular range and a second angular range different from the first angular range, and to obtain a second partial image using second tomography data acquired as the first x-ray generator and the second X-ray generator rotate around the object over the second angular range and a third angular range opposite to the first angular range;
acquire motion information representing an amount of motion of the object over time by using the first partial image and the second partial image; and
reconstruct a target image showing the object at a target time point by using the motion information.

10. The tomography apparatus of claim 9 , wherein each of the first angular range, the second angular range, and the third angular range is less than 180 degrees.

11. The tomography apparatus of claim 9 , wherein the first x-ray generator is spaced apart from the second X-ray generator by a 90-degree interval.

12. The tomography apparatus of claim 11 , wherein the at least one processor is further configured to acquire the first tomography data and the second tomography data as the first x-ray generator and the second X-ray generator rotate around the object by 90 degrees and an extra angle, and
wherein the extra angle is less than or equal to 90 degrees.

13. The tomography apparatus of claim 9 , wherein the at least one processor is further configured to acquire third tomography data corresponding to an angular range of 180 degrees and an extra angle by using the first x-ray generator and the second X-ray generator, and
wherein the extra angle is in a range of 30 degrees to 70 degrees.

14. The tomography apparatus of claim 9 , wherein the at least one processor is further configured to reconstruct the target image based on a first reconstructed image and a second reconstructed image, the first reconstructed image and the second reconstructed image being based on the first tomography data and the second tomography data acquired during rotation of the first x-ray generator and the second X-ray generator using the motion information.

15. The tomography apparatus of claim 14 , wherein the at least one processor is further configured to reconstruct the target image by performing image registration between the first reconstructed image and the second reconstructed image.

16. A method of reconstructing a tomography image, the method comprising:
obtaining a first image using first tomography data acquired as a first X-ray generator for generating X-rays having a first energy rotates around an object over a first angular range, and obtaining a second image using second tomography data acquired as a second X-ray generator for generating X-rays having a second energy rotates around the object over a second angular range different from the first angular range;
determining motion information representing an amount of motion of the object over time by using the first image and the second image; and
reconstructing a target image showing the object at a target time point using the motion information.

17. The method of claim 16 , wherein the first image and the second image are partial images, and the first angular range is opposite to the second angular range, and
wherein each of the first angular range and the second angular range is less than 180 degrees.

18. The method of claim 16 , wherein the motion information comprises information representing an amount of motion of a surface forming the object.

19. The method of claim 16 , wherein the reconstructing of the target image comprises predicting an amount of motion of the object at the target time point based on the motion information, and reconstructing the target image based on the predicted amount of motion.

20. The method of claim 16 , wherein the reconstructing of the target image comprises reconstructing the target image based on a first reconstructed image and a second reconstructed image, the first reconstructed image and the second reconstructed image being generated based on the first tomography data and the second tomography data acquired during rotation of the first x-ray generator and the second X-ray generator using the motion information.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Kyoung-Yong
• Kim Do-Il
• Rifu Toshihiro
• Lee Duhgoon

Classifications

• A61B6/5205

  involving processing of raw data to produce diagnostic data · CPC title

• A61B6/482

  involving multiple energy imaging · CPC title

• A61B6/027

  characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral · CPC title

• A61B6/032

  Transmission computed tomography [CT] · CPC title

• A61B6/5264 Primary

  due to motion · CPC title