Patent ID: 8868159

Claim:
An optical imaging diagnostic apparatus in which a probe includes an imaging core provided with a transmitting and receiving unit for carrying out continuous transmitting of light which is reflected from biological tissue and received as obtained reflected light by the transmitting and receiving unit, with the transmitting and receiving unit being axially movable inside a body lumen while also rotating the transmitting and receiving unit, to generate a plurality of cross-sectional images in an axial direction of the biological tissue using line data of coherent light produced by interference between the obtained reflected light and reference light, the apparatus comprising: a display which displays a first display area for displaying a cross-sectional image of the plurality of cross-sectional images and a second display area for displaying a calculated attenuation rate; a storage unit which stores a plurality of the line data including the line data used to generate the displayed cross-sectional image; a display control means for controlling the display to display, in the first display area, the cross-sectional image based on the line data stored in the storage unit and, superimposed on the displayed cross-sectional image, a line extending in a radial direction of the body lumen by setting a center position of the transmitting and receiving unit of the imaging core as an endpoint node; designating means for designating on the displayed cross-sectional image the radial direction of the line depending on steering by a user; extraction means for extracting, from amongst the plurality of the line data used to generate the cross-sectional image and which is stored in the storage unit, the line data corresponding to the radial direction designated by the designating means; and calculation means for calculating attenuation rate in a predetermined region in the radial direction of the body lumen with respect to the line data extracted by the extraction means; wherein the display control means controls the display to display, in the second display area, the attenuation rate calculated by the calculation means.