A homogeneous tomographic image is generated in an image diagnostic apparatus having a plurality of transmitting and receiving sections. According to the present invention, a transmitting / receiving unit in which a first transmitting / receiving unit for transmitting and receiving an ultrasonic signal and a second transmitting / receiving unit for transmitting / receiving an optical signal are arranged rotates around a lumen of the object to be measured, Direction, a first tomographic image in the lumen of the object to be measured, using the ultrasonic signal transmitted and received by the first transceiver and the optical signal transmitted and received by the second transceiver, And an image diagnostic apparatus that generates a first tomographic image and a second tomographic image, the image diagnostic apparatus identifies whether to generate both the first tomographic image and the second tomographic image or only the first tomographic image Control unit 506 and ultrasound line data for changing the gain when generating the first tomographic image based on the ultrasound signal received by the first transceiving unit according to the result of identification in control unit 506 And a correction unit 513.複数の送受信部を有する画像診断装置において、均質な断層画像を生成する。本発明は、超音波信号の送受信を行う第1の送受信部と、光信号の送受信を行う第2の送受信部とが配置された送受信部が、被測定体の管腔内を回転しながら軸方向に移動した場合において、該第1の送受信部が送受信した超音波信号と該第2の送受信部が送受信した光信号とを用いて、該被測定体の管腔内の第1の断層画像及び第2の断層画像を生成する画像診断装置であって、前記第1の断層画像と前記第2の断層画像の両方を生成するか、前記第1の断層画像のみを生成するかを識別する制御部506と、制御部506における識別の結果に応じて、前記第1の送受信部が受信した超音波信号に基づいて前記第1の断層画像を生成する際のゲインを変更する超音波ラインデータ補正部513とを備える。
