PROBLEM TO BE SOLVED: To provide an optical tomography system capable of displaying tomographic images of the accurate change of ultrasonic velocity.SOLUTION: The optical tomography system 1 has an ultrasonic velocity analysis part 8 for displaying tomographic images regarding the distribution of changes in ultrasonic velocity for obtaining the change of ultrasonic velocity to the light irradiation in the measurement area based on ultrasonic echo signals during non-irradiation received from the measurement area during non-irradiation and the ultrasonic echo signals after light irradiation received from the measurement area after light irradiation, and it has an envelope data extracting part 14 for extracting the envelope of signal waveform about each ultrasonic echo signal before and after light irradiation, and an interest signal interval extraction part 15 for extracting the interest signal interval at the signal waveform about each ultrasonic echo signal before and after light irradiation from the extracted envelope data, and the ultrasonic velocity analysis part 8 obtaining the change of ultrasonic velocity based on signals in the interest signal intervals of the ultrasonic echo signal during non-irradiation and of the ultrasonic echo signal after light irradiation.COPYRIGHT: (C)2008,JPO&INPIT【課題】正確な超音波速度変化の断層画像を表示することができる光トモグラフィ装置を提供する。【解決手段】光を照射していない時の測定領域から受波した非照射時超音波エコー信号と光照射後の測定領域から受波した光照射後超音波エコー信号とに基づいて測定領域への光照射に対する超音波速度変化を求めて超音波速度変化の分布に関する断層画像として表示する超音波速度解析部8とを備えた光トモグラフィ装置1であって、光照射前後の超音波エコー信号それぞれの信号波形の包絡線を抽出する包絡線データ抽出部14と、抽出された包絡線データに基づいて光照射前後の超音波エコー信号それぞれの信号波形における関心信号区間を抽出する関心信号区間抽出部15とを備え、超音波速度解析部8は、非照射時超音波エコー信号および光照射後超音波エコー信号の関心信号区間内の信号に基づいて超音波速度変化を求める。【選択図】図1
