IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM

An image processing apparatus includes a memory storing a program, and a processor which, by executing the program, causes the image processing apparatus to acquire data including a three-dimensional image obtained by capturing an image of a subject under examination, a standard plane parameter representing a predetermined standard plane in the three-dimensional image, and an anatomical landmark position in the three-dimensional image, and acquire a vicinity cross section image defining a cross section in the vicinity of the predetermined standard plane. The processor further causes the image processing apparatus to acquire the anatomical landmark position on the vicinity cross section image, and acquire a learning model generated by using information including the vicinity cross section image and the anatomical landmark position acquired by the image processing apparatus to estimate, from the cross section image, an anatomical landmark position on the cross section image.