Similarity determination apparatus, similarity determination method, and similarity determination program

A similarity determination method that determines a similarity between a first three-dimensional medical image and a second three-dimensional medical image, the similarity determination method comprising:

• classifying each pixel of the first medical image into at least one of a plurality of types of findings;
• calculating a first feature amount for each finding classified in the first medical image;
• deriving the similarity between the first medical image and the second medical image on the basis of the first feature amount for each finding calculated in the first medical image and a second feature amount for each finding calculated in the second medical image;
• and
• determining at least one important region including an important finding for deriving the similarity in the second medical image.

A non-transitory computer-readable storage medium that stores a similarity determination program that causes a computer to perform a process of determining a similarity between a first three-dimensional medical image and a second three-dimensional medical image, the similarity determination program causing the computer to perform:

• a step of classifying each pixel of the first medical image into at least one of a plurality of types of findings;
• a step of calculating a first feature amount for each finding classified in the first medical image;
• a step of deriving the similarity between the first medical image and the second medical image on the basis of the first feature amount for each finding calculated in the first medical image and a second feature amount for each finding calculated in the second medical image;
• and
• a step of determining at least one important region including an important finding for deriving the similarity in the second medical image.