X-ray CT system, image display device, and image display method

An X-ray CT system, comprising:

• processing circuitry configured to
• acquire data by scanning, with X-rays, a subject placed on a patient table;
• generate volumetric data based on the acquired data;
• generate sectional images corresponding to an axial section, a sagittal section, and a coronal section based on the volumetric data so that the subject in each image is oriented in a preset standard direction regardless of an actual body position of the subject,
• acquire body-position information corresponding to the actual body position of the subject,
• determine, for each of the sectional images, necessity of a coordinate transformation, based on the actual body position and the preset standard direction in each of the sectional images,
• apply the coordinate transformation to at least one of the sectional images for which it is determined that the coordinate transformation is necessary, so that the subject in the at least one of the sectional images is oriented in a direction corresponding to the actual body position, and
• cause a display to display the sectional ages including at least one image to which the coordinate transformation is applied,
• wherein the processing circuitry is further configured to specify a particular sectional image from among the sectional images according to an input from an operator, and determine the necessity of the coordinate transformation for only the specified image.