Imaging apparatus for diagnosis and program

An imaging apparatus for diagnosis constructing a first tomographic image and a second tomographic image inside a lumen of a measurement subject body by using an ultrasound signal which is transmitted and received by a first transmitting and receiving unit and an optical signal which is transmitted and received by a second transmitting and receiving unit in a case where a transmitting and receiving unit in which the first transmitting and receiving unit performing transmission and reception of the ultrasound signal and the second transmitting and receiving unit performing transmission and reception of the optical signal are disposed moves in an axial direction while rotating in the lumen of the measurement subject body, the apparatus comprising:

• acquisition means for acquiring a propagation velocity of the ultrasound signal in a medium flowing inside the lumen;
• generation means for generating ultrasound line data indicating strength of a reflection signal from each position in a transmitting and receiving direction of the ultrasound signal, based on the propagation velocity acquired by the acquisition means;
• and
• conversion means for converting positional information of each position on an outer side from a range in which the medium flows regarding the ultrasound line data generated by the generation means, based on a ratio between a predetermined propagation velocity and the propagation velocity which is acquired by the acquisition means,
• wherein the first tomographic image is constructed by using the ultrasound line data which is converted by the conversion means.

A method of controlling an image processing apparatus, which processes an image of a target object constructing a first tomographic image and a second tomographic image inside a lumen of a measurement subject body by using an ultrasound signal which is transmitted and received by a first transmitting and receiving unit and an optical signal which is transmitted and received by a second transmitting and receiving unit in a case where a transmitting and receiving unit in which the first transmitting and receiving unit performing transmission and reception of the ultrasound signal and the second transmitting and receiving unit performing transmission and reception of the optical signal are disposed moves in an axial direction while rotating in the lumen of the measurement subject body, the method comprising:

• acquiring a propagation velocity of the ultrasound signal in a medium flowing inside the lumen;
• generating ultrasound line data indicating strength of a reflection signal from each position in a transmitting and receiving direction of the ultrasound signal based on a predetermined propagation velocity;
• converting positional information of each position within a range in which the medium flows regarding the ultrasound line data generated based on a ratio between the predetermined propagation velocity and the propagation velocity;
• and
• constructing the first tomographic image by using the ultrasound line data from the converting of the positional information.