Image processing device, image processing method, and image processing program

An image processing method comprising:

• acquiring two radiographic images based on radiation which has different energy distributions and has been transmitted through a subject including a soft part and a bone part;
• and
• deriving a difference between a value of an attenuation coefficient of the soft part×a thickness of the soft part+an attenuation coefficient of the bone part×a thickness of the bone part and each pixel value of the radiographic image for each of the different energy distributions while changing the attenuation coefficient of the soft part for each of the different energy distributions, the thickness of the soft part, the attenuation coefficient of the bone part for each of the different energy distributions, and the thickness of the bone part from initial values and deriving the attenuation coefficient of the soft part and the attenuation coefficient of the bone part for each of the different energy distributions at which the difference is minimized or the difference is less than a predetermined threshold value.

A non-transitory computer-readable storage medium that stores an image processing program that causes a computer to perform:

• a procedure of acquiring two radiographic images based on radiation which has different energy distributions and has been transmitted through a subject including a soft part and a bone part;
• and
• a procedure of deriving a difference between a value of an attenuation coefficient of the soft part×a thickness of the soft part+an attenuation coefficient of the bone part×a thickness of the bone part and each pixel value of the radiographic image for each of the different energy distributions while changing the attenuation coefficient of the soft part for each of the different energy distributions, the thickness of the soft part, the attenuation coefficient of the bone part for each of the different energy distributions, and the thickness of the bone part from initial values and deriving the attenuation coefficient of the soft part and the attenuation coefficient of the bone part for each of the different energy distributions at which the difference is minimized or the difference is less than a predetermined threshold value.