Image processing apparatus and X-ray diagnostic apparatus

1. An image processing apparatus, comprising:

processing circuitry configured to

acquire correction information on a luminance value of a contrast image, based on a concentration of a contrast material and a thickness of the contrast material in a projection direction in a device that is inserted into a blood vessel, in the contrast image, and

correct the contrast image using the acquired correction information.

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

estimate scatter and body thickness, when a curve that indicates a relation between the luminance value and both the concentration and the thickness of the contrast material in the contrast image, satisfies a relation between the luminance value and both the concentration and the thickness of the contrast material in a predetermined region, and acquire a correction curve based on the curve that corresponds to the estimated scatter and the body thickness, and

correct the luminance value of each pixel in the contrast image using the acquired correction curve.

3. The image processing apparatus according to claim 2 , wherein the processing circuitry is further configured to estimate each of the scatter and the body thickness to be a clinically acceptable value, and acquire the correction curve based on the curve corresponding to the estimated scatter and the body thickness.

4. The image processing apparatus according to claim 1 , wherein the processing circuitry is further configured to

extract a curve that satisfies a relation between the luminance value and both the concentration and the thickness of the contrast material in the predetermined region, from a plurality of curves that each indicates a relation between the luminance value and both the concentration and the thickness of the contrast material in the contrast image that is set in advance for each condition of the scatter and the body thickness, and acquire the correction curve based on the extracted curve, and

correct the luminance value of each pixel in the contrast image using the acquired correction curve.

5. The image processing apparatus according to claim 2 , wherein the processing circuitry is further configured to acquire the correction curve by averaging the curves that each satisfies the relation between the luminance value and both the concentration and the thickness of the contrast material in the predetermined region.

6. The image processing apparatus according to claim 3 , wherein the processing circuitry is further configured to acquire the correction curve by averaging the curves that each satisfies the relation between the luminance value and both the concentration and the thickness of the contrast material in the predetermined region.

7. The image processing apparatus according to claim 2 , wherein the processing circuitry is further configured to estimate the scatter and the body thickness of a subject while the contrast image is obtained, based on a luminance value at a position in which a signal from the contrast material becomes maximum in the predetermined region.

8. The image processing apparatus according to claim 3 , wherein the processing circuitry is further configured to estimate the scatter and the body thickness of a subject while the contrast image is obtained, based on a luminance value at a position in which a signal from the contrast material becomes maximum in the predetermined region.

9. The image processing apparatus according to claim 2 , wherein

the predetermined region is a catheter region included in the contrast image, and

the processing circuitry is further configured to use the concentration of the contrast material, which is injected through a catheter, and an inner diameter of the catheter, as the concentration and the thickness of the contrast material in the predetermined region.

10. The image processing apparatus according to claim 3 , wherein

the predetermined region is a catheter region included in the contrast image, and

the processing circuitry is further configured to use the concentration of the contrast material, which is injected through a catheter, and an inner diameter of the catheter, as the concentration and the thickness of the contrast material in the predetermined region.

11. The image processing apparatus according to claim 9 , wherein the processing circuitry is further configured to

calculate the thickness of the contrast material in the projection direction, based on an angle formed by a longitudinal direction of the catheter and the projection direction, and

use the calculated thickness of the contrast material as the thickness of the contrast material in the predetermined region.

12. The image processing apparatus according to claim 10 , wherein the processing circuitry is further configured to

calculate the thickness of the contrast material in the projection direction, based on an angle formed by a longitudinal direction of the catheter and the projection direction, and

use the calculated thickness of the contrast material as the thickness of the contrast material in the predetermined region.

13. The image processing apparatus according to claim 11 , wherein the processing circuitry is further configured to calculate the angle formed by the longitudinal direction of the catheter and the projection direction, based on the contrast image of the catheter, which is from at least two directions, or a distance marker on the catheter.

14. The image processing apparatus according to claim 12 , wherein the processing circuitry is further configured to calculate the angle formed by the longitudinal direction of the catheter and the projection direction, based on the contrast image of the catheter, which is obtained from at least two directions, or a distance marker on the catheter.

15. An X-ray diagnostic apparatus, comprising:

processing circuitry configured to

acquire correction information on a luminance value of a contrast image, based on a concentration of a contrast material and a thickness of the contrast material in a projection direction in a device that is inserted into a blood vessel, in the contrast image, and

correct the contrast image using the acquired correction information.