The medical device includes an information acquiring unit that acquires position information and line-of-sight direction information of a predetermined viewpoint, a positioning unit that adjusts position information and line-of-sight information to a coordinate system of three-dimensional image information of a predetermined luminal organ, A position calculating section for calculating a position intersecting with an inner wall of a predetermined hollow organ when the line of sight of a predetermined viewpoint is extended, a distance calculating section for calculating distance information to the position of the position calculating section and a predetermined viewpoint , An index generating unit for generating an index defined based on the distance information, and an index generating unit for generating an index and position information of the inner wall on a two-dimensional model image in which a three-dimensional image of a predetermined hollow organ or a predetermined luminal organ has been developed And an image generation unit that generates an associated image.医療装置は、所定の視点の位置情報と視線方向情報を取得する情報取得部と、位置情報及び視線情報を、所定の管腔臓器の3次元画像情報の座標系に合わせ込む位置合わせ部と、所定の視点の視線方向を延長したときに所定の管腔臓器の内壁と交差する位置を算出する位置算出部と、位置算出部の位置と所定の視点までの距離情報を算出する距離算出部と、距離情報に基づき規定される指標を生成する指標生成部と、所定の管腔臓器の3次元画像又は所定の管腔臓器を展開した2次元モデル画像上において、指標と内壁の位置情報とを関連付けた画像を生成する画像生成部と、を備える。
