Medical image processing device

1. A medical image processing device comprising:

subtraction circuitry configured to generate a DSA (Digital Subtraction Angiography) image between a first X-ray collection image collected before a contrast medium is injected and a second X-ray collection image collected after the contrast medium is injected;

first reconstruction circuitry configured to generate a first reconstructed image in which a vessel is depicted on the basis of the DSA image using a first reconstruction filter;

second reconstruction circuitry configured to generate a second reconstructed image in which a stent placed into the vessel is depicted on the basis of the first X-ray collection image collected before the contrast medium is injected by using a second reconstruction filter having a high-frequency emphasis effect more than that of the first reconstruction filter and by adjusting at least one of a window width and a window level; and

image combining circuitry configured to combine the first reconstructed image in which the vessel is depicted with the second reconstructed image in which the stent is depicted.

2. The medical image processing device according to claim 1 , further comprising:

specifying circuitry; and

identification circuitry,

wherein,

the stent includes stent markers provided at both ends thereof,

the specifying circuitry applies the first reconstruction filter to the image before the contrast medium is injected to generate a third reconstructed image, and performs threshold processing on the third reconstructed image to specify the stent markers,

the identification circuitry identifies an area of interest surrounded by the stent markers in the third reconstructed image, and

the second reconstruction circuitry applies the second reconstruction filter to the area of interest in the image before the contrast medium is injected and generates the second reconstructed image for the area of interest.

3. The medical image processing device according to claim 1 , further comprising:

specifying circuitry; and

identification circuitry,

wherein,

the stent includes stent markers provided at both ends thereof,

the specifying circuitry applies the first reconstruction filter to the image before the contrast medium is injected to generate a third reconstructed image, and performs threshold processing on the third reconstructed image to specify the stent markers,

the identification circuitry identifies an area of interest surrounded by the stent markers in the second reconstructed image, and

the image combining circuitry combines the first reconstructed image with the area of interest identified in the second reconstructed image.

4. The medical image processing device according to claim 1 ,

wherein the first reconstruction circuitry performs a reducing process or a low-pass filtering process as a pre-process on the X-ray collection image and applies a reconstruction filter to the X-ray collection image subjected to the reducing process or the low-pass filtering process, thereby generating the first reconstructed image.

5. The medical image processing device according to claim 4 ,

wherein the length of one side of a voxel forming the first reconstructed image is equal to, or more than, 1.5 times the length of one size of a voxel forming the second reconstructed image.

6. The medical image processing device according to claim 1 ,

wherein the image combining circuitry further corrects the densities of the first reconstructed image and the second reconstructed image.

7. The medical image processing device according to claim 6 ,

wherein the image combining circuitry performs correction using the average of pixel values in a part of the second reconstructed image and the average of pixel values in a part of the first reconstructed image corresponding to the part of the second reconstructed image.

8. A medical image processing device comprising:

first reconstruction circuitry configured to generate a first reconstructed image in which a vessel is depicted on the basis of an X-ray collection image capturing the image of the vessel and an image of a stent placed into the vessel using a first reconstruction filter;

specifying circuitry;

identification circuitry,

second reconstruction circuitry configured to generate a second reconstructed image in which the stent placed into the vessel is depicted on the basis of the X-ray collection image by using a second reconstruction filter having a high-frequency emphasis effect more than that of the first reconstruction filter and by adjusting at least one of a window width and a window level; and

image combining circuitry;

wherein

the stent includes stent markers provided at both ends thereof,

the specifying circuitry performs threshold processing on the first reconstructed image to specify the stent markers,

the identification circuitry identifies an area of interest surrounded by the stent markers in the first reconstructed image,

the second reconstruction circuitry applies the second reconstruction filter to the area of interest in the X-ray collection image and generates the second reconstructed image for the area of interest in which the stent is depicted, and

the image combining circuitry combines the first reconstructed image in which the vessel is depicted with the second reconstructed image for the area of interest in which the stent is depicted.

9. A medical image processing device comprising:

first reconstruction circuitry configured to generate a first reconstructed image in which a vessel is depicted on the basis of an X-ray collection image capturing the image of the vessel and an image of a stent placed into the vessel using a first reconstruction filter;

second reconstruction circuitry configured to generate a second reconstructed image in which the stent placed into the vessel is depicted on the basis of the X-ray collection image by using a second reconstruction filter having a high-frequency emphasis effect more than that of the first reconstruction filter and by adjusting at least one of a window width and a window level;

specifying circuitry;

identification circuitry, and

image combining circuitry;

wherein

the stent includes stent markers provided at both ends thereof,

the specifying circuitry performs threshold processing on the first reconstructed image to specify the stent markers,

the identification circuitry identifies an area of interest surrounded by the stent markers in the second reconstructed image, and

the image combining circuitry combines the first reconstructed image in which the vessel is depicted with the area of interest identified in the second reconstructed image in which the stent is depicted.