Evaluation apparatus, evaluation method, and evaluation program

An evaluating method, comprising:

• extracting at least one portion of a region of a target structure from a three dimensional image of the target structure which includes lumen structures having branches;
• extracting the lumen structures from the at least one portion of the region of the target structure;
• and
• calculating an index value that represents the uniformity of the distribution of the lumen structures within the at least one portion of the region of the target structure, based on the at least one portion of the region of the target structure and the extracted lumen structures.

A non-transitory recording medium having an evaluating program recorded therein, the evaluating program causing a computer to execute the procedures of:

• extracting at least one portion of a region of a target structure from a three dimensional image of the target structure which includes lumen structures having branches;
• extracting the lumen structures from the at least one portion of the region of the target structure;
• and
• calculating an index value that represents the uniformity of the distribution of the lumen structures within the at least one portion of the region of the target structure, based on the at least one portion of the region of the target structure and the extracted lumen structures.