PROBLEM TO BE SOLVED: To avoid, in an OCT apparatus, the appearance of a ghost in the vicinity of an image of a subject that would affect diagnosis.SOLUTION: There is provided an optical tomographic apparatus, comprising: image generation means for generating a tomographic image including a subject, based on tomographic information acquired from coherent light obtained by multiplexing return light from the subject irradiated with measurement light split from light emitted from a light source, with reference light split from the emitted light drive means for driving a measurement optical system which guides the measurement light to the subject, such that the activation distance between the subject and the measurement optical system becomes a predetermined activation distance and adjustment means for adjusting the difference between the optical path length of the measurement light and the optical path length of the reference light to a predetermined optical path length difference. The optical tomographic apparatus further comprises control means for controlling the adjustment means such that no ghost appears in a tomographic image which is caused by interference between reflection of the measurement light from an optical element constituting the measurement optical system and the reference light.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2018,JPO&INPIT【課題】OCT装置において、診断に影響を及ぼすような被検体像の近傍にゴーストが出現することを避ける。【解決手段】光源から射出された光より分割された測定光が照射された被検体からの戻り光と、射出された光より分割された参照光とを合波して得た干渉光より得られる断層情報に基づいて被検体像を含む断層画像を生成する画像生成手段と、被検体と、測定光を被検体に導く測定光学系との作動距離が所定の作動距離になるように、測定光学系を駆動する駆動手段と、測定光の光路長と参照光の光路長との差を所定の光路長差に調整する調整手段と、を有する光断層撮像装置において、測定光が測定光学系を構成する光学素子で反射した反射光と参照光との干渉により生じるゴーストが断層画像に出現しないように、調整手段を制御する制御手段を配する。【選択図】図6
