1. A diagnostic imaging apparatus comprising: a top panel height calculation unit configured to calculate a height of a top panel corresponding to the distance between the fulcrum of the top panel and the imaging position, from an image captured by continuous imaging of the subject; an imaging position estimation unit configured to estimate an imaging position of an image captured by a different imaging method from a method for the captured image based on the height of the top panel calculated by the top panel height calculation unit, the distance between the fulcrum of the top panel corresponding to the height and the imaging position, and a correction table, the correction table being a table in which a protrusion amount of a top panel and a bending amount of the top panel corresponding to the protrusion amount are associated, or a distance between a fulcrum of the top panel and an imaging position of a subject, and a height of the top panel in the imaging position are associated; and an image correction unit configured to align the imaging position of the image captured by the different imaging method with the imaging position of the image captured by the continuous imaging.