Medical image processing apparatus and medical image processing method

A medical image processing apparatus which reconstructs a tomographic image from projection data of a subject in which metal material is included, comprising:

• a projection space correction section which corrects the projection data and thereby generates corrected projection data;
• an image space correction section which corrects the tomographic image by using the corrected projection data;
• and
• a coefficient setting section which sets a projection space coefficient which is used in the projection space correction section and an image space coefficient which is used in the image space correction section;
• wherein the coefficient setting section sets the projection space coefficient and the image space coefficient on the basis of any of a feature value of a metallic region, a scanning condition used when acquiring the projection data, and a reconstruction condition used when reconstructing the tomographic image,
• wherein the scanning condition includes a cone angle which is an opening angle in a body axis direction of the subject, and
• the coefficient setting section sets the projection space coefficient larger and sets the image space coefficient smaller as the cone angle of the projection data becomes smaller.

A medical image processing apparatus which reconstructs a tomographic image from projection data of a subject in which metal material is included, comprising:

• a projection space correction section which corrects the projection data and thereby generates corrected projection data;
• an image space correction section which corrects the tomographic image by using the corrected projection data;
• and
• a coefficient setting section which sets a projection space coefficient which is used in the projection space correction section and an image space coefficient which is used in the image space correction section;
• wherein the coefficient setting section sets the projection space coefficient and the image space coefficient on the basis of any of a feature value of a metallic region, a scanning condition used when acquiring the projection data, and a reconstruction condition used when reconstructing the tomographic image, and
• wherein the coefficient setting section sets the projection space coefficient larger and sets the image space coefficient smaller as body motion of the subject becomes smaller.

A medical image processing method for reconstructing a tomographic image from projection data of a subject in which metal material is included, comprising:

• a projection space correcting step of correcting the projection data and thereby generating corrected projection data;
• an image space correcting step of correcting the tomographic image by using the corrected projection data;
• and
• a coefficient setting step of setting a projection space coefficient which is used in the projection space correcting step and an image space coefficient which is used in the image space correcting step,
• wherein the larger the projection space coefficient is, the smaller the image space coefficient becomes.