PROBLEM TO BE SOLVED: To provide an optical tomographic image displaying system capable of displaying an image with a high resolution and a high sensitivity in a wavelength scanning type optical coherent tomography.SOLUTION: An interference optical meter and a wavelength scanning light source 10, which periodically varies its oscillation wavelength, are employed. A reflecting object is disposed at a measurement position, and an A/D conversion is applied to an optical interference signal at even time intervals, and data numbers of timings when a peak and a bottom appear, are calculated by using a least-square method. Then, an approximate expression is derived based on above results by using a polynomial approximation, and the numerical sequence is calculated which consists of numbers of power of two obtained by converting the data numbers so as to be spaced evenly in frequency. Next, an object to be measured is disposed at the measurement position, and the number of data sets required for an FFT are calculated from measurement data at respective timings in this period by using a linear approximation, and a Fourier transform is applied to an optical beat signal which is obtained by an optical interferometer, at even frequency intervals, thereby obtaining the tomographic image.COPYRIGHT: (C)2009,JPO&INPIT【課題】波長走査型光コヒーレントトモグラフィにおいて、高分解能で高感度で画像表示できる断層画像表示システムを提供すること。【解決手段】周期的に発振波長を変化させる波長走査型光源10と干渉光学計を用いる。測定位置に反射物体を配置し、光干渉信号を等時間間隔でA/D変換し、最小二乗法でピーク及びボトムとなるタイミングのデータ番号を算出する。これに基づいて多項式近似によって近似式を算出し、データ番号を等周波数間隔となるように変換した2の巾乗の数から成る数列を算出する。そして測定位置に測定対象を配置し、測定データからこの時間のタイミング毎に直線近似によってFFTに必要な数のデータを算出して、光干渉計より得られる光ビート信号を等周波数間隔でフーリエ変換することにより、断層画像を得る。【選択図】図2
