X-ray CT apparatus and image processing apparatus

An image processing apparatus comprising:

• processing circuitry configured to:
• every time any of a plurality of reconstructed CT images is designated as a display object image, cause the computed tomography (CT) image designated as the display object image to be displayed on a display, and perform preprocessing on raw data corresponding to the CT image designated as the display object image, and
• when the processing circuitry receives an enlargement instruction to enlarge the CT image displayed on the display, reconstruct an enlarged CT image using the raw data, which is preprocessed after the CT image is designated as the display object image and before the processing circuitry receives the enlargement instruction, based on the enlargement instruction, and cause the reconstructed enlarged CT image to be displayed on the display, wherein
• the processing circuitry causes, until reconstruction of the enlarged CT image is completed, an enlarged image obtained by enlarging the CT image designated as the display object image to be displayed on the display, and causes, after completion of the reconstruction, the enlarged CT image to be displayed on the display.

An X-ray computed tomography (CT) apparatus comprising:

• processing circuitry configured to:
• cause a CT image designated as a display object image to be displayed on a display, every time any of a plurality of reconstructed CT images is designated as the display object image, specify a CT image including an image indicating a certain lesion region among the plurality of reconstructed CT images, and perform preprocessing on raw data corresponding to the specified CT image, and
• when the processing circuitry receives an enlargement instruction to enlarge the CT image displayed on the display, reconstruct an enlarged CT image using the raw data, which is preprocessed after the CT image including the image indicating the certain lesion region is specified and before the processing circuitry receives the enlargement instruction, and cause the reconstructed enlarged CT image to be displayed on the display, wherein
• the processing circuitry causes, until reconstruction of the enlarged CT image is completed, an enlarged image obtained by enlarging the CT image designated as the display object image to be displayed on the display, and causes, after completion of the reconstruction, the enlarged CT image to be displayed on the display.