JP2010110391A5

JP2010110391A5 -

Info

Publication number: JP2010110391A5
Application number: JP2008283870A
Authority: JP
Filing date: 2008-11-05
Publication date: 2011-12-22
Anticipated expiration: 2028-11-05

Description

（１）
測定光源と、測定光源から発せられた光を測定光と参照光に分割する分割手段と、前記分割手段によって分割された測定光を被検眼の所定部位上で走査させる走査手段と、被検眼の所定部位に照射された前記測定光による反射光と参照光とが合成された光を受光する第１の受光素子と、を有し、被検眼の所定部位における断層画像を得るための干渉光学系と、
被検眼の前記所定部位に照明光を照射する照明光学系と、被検眼の前記所定部位からの反射光を第２の受光素子により受光する受光光学系と、を有し、前記所定部位における正面画像を得るための観察光学系と、
前記第１の受光素子から出力される受光信号に基づいて断層画像を取得すると共に、前記第２の受光素子から出力される受光信号に基づいて正面画像を取得する画像処理部と、
所定の信号に基づいて前記走査手段による測定光の走査位置を設定する走査位置設定手段と、を備える眼科撮影装置において、
過去に取得された断層画像，該断層画像を取得したときの前記測定光の走査位置情報，及び該断層画像と対応付けられて取得した正面画像を記憶する記憶手段に記憶された前記過去の正面画像と，前記画像処理部によって取得される現在の正面画像とを比較して、前記過去の正面画像に対する現在の正面画像の位置ずれ方向及び位置ずれ量を画像処理により検出する位置ずれ検出手段と、
前記記憶手段から前記走査位置情報を取得し、前記位置ずれ検出手段によって検出された前記位置ずれ方向及び位置ずれ量に基づいて該走査位置情報を補正する補正手段と、
前記走査位置設定手段によって設定される現在の走査位置情報と，前記補正後の走査位置情報と，の走査位置のずれ量を逐次検出し、逐次検出される該ずれ量が所定の許容範囲を満たすか否かを判別する判別手段と、を備えることを特徴とする。
（２）（１）の眼科撮影装置において、
取得した画像を表示するためのモニタと、
前記判別手段によって前記走査位置のずれ量が所定の許容範囲を満たすと判別されたとき、走査位置の調整が適正である旨を前記モニタ上に表示する表示制御手段と、を備えることを特徴とする。
（３）（１）〜（２）のいずれかの眼科撮影装置において、前記判別手段によって前記ずれ量が所定の許容範囲を満たすと判別されたとき、撮影開始のトリガ信号を自動的に発する自動撮影手段を備えることを特徴とする。
（４）（１）〜（３）の眼科撮影装置において、
前記表示制御手段は、現在取得される正面画像を前記モニタに表示すると共に、前記過去の断層画像とほぼ同じ部位に走査位置を調整するための目標としてのターゲット指標と、現在の走査位置を示すスキャンラインと、をそれぞれ前記正面画像上に重畳して表示させる表示制御手段であって、
該表示制御手段は、前記補正手段によって補正された走査位置情報に対応する位置に前記ターゲット指標を表示すると共に、前記走査位置設定手段による走査位置の変更に応じて前記スキャンラインの表示位置を変化させることを特徴とする。

(1)
A measurement light source, a dividing unit that divides light emitted from the measurement light source into measurement light and reference light, a scanning unit that scans the measurement light divided by the dividing unit on a predetermined part of the eye to be examined, An interference optical system for obtaining a tomographic image at a predetermined part of the eye to be examined, comprising: a first light receiving element that receives a light obtained by combining the reflected light of the measurement light irradiated to the predetermined part and the reference light When,
An illumination optical system for irradiating the predetermined part of the eye to be examined with illumination light; and a light receiving optical system for receiving reflected light from the predetermined part of the eye to be examined by a second light receiving element; An observation optical system for obtaining an image;
An image processing unit that acquires a tomographic image based on a light reception signal output from the first light receiving element and acquires a front image based on a light reception signal output from the second light receiving element;
In an ophthalmologic photographing apparatus comprising: a scanning position setting unit that sets a scanning position of measurement light by the scanning unit based on a predetermined signal;
Previously acquired tomographic image, the scanning position information of the measuring light, and the past front stored in the storage means for storing a front image obtained in association with the tomographic image when obtaining the tomographic image A misregistration detecting means for comparing an image with a current front image acquired by the image processing unit and detecting a misregistration direction and a misregistration amount of the current front image with respect to the past front image by image processing; ,
Correction means for acquiring the scanning position information from the storage means and correcting the scanning position information based on the positional deviation direction and the positional deviation amount detected by the positional deviation detection means;
The shift amount of the scan position between the current scan position information set by the scan position setting means and the corrected scan position information is sequentially detected, and the shift amount detected sequentially satisfies a predetermined allowable range. Discriminating means for discriminating whether or not.
(2) In the ophthalmologic photographing apparatus according to ( 1) ,
A monitor for displaying the acquired image;
Display control means for displaying on the monitor that the adjustment of the scanning position is appropriate when it is determined by the determining means that the amount of deviation of the scanning position satisfies a predetermined allowable range. To do.
(3) In the ophthalmologic photographing apparatus according to any one of (1) to (2), when the determination unit determines that the deviation amount satisfies a predetermined allowable range, automatic generation of a trigger signal for starting imaging is performed. An imaging means is provided.
(4) In the ophthalmologic photographing apparatus according to (1) to (3) ,
The display control means displays a currently acquired front image on the monitor, and indicates a target index as a target for adjusting a scanning position to substantially the same part as the past tomographic image, and a current scanning position. A display control means for displaying a scan line superimposed on the front image.
The display control means displays the target index at a position corresponding to the scanning position information corrected by the correction means, and changes the display position of the scan line according to the change of the scanning position by the scanning position setting means. It is characterized by making it.

Claims

A measurement light source, a dividing unit that divides light emitted from the measurement light source into measurement light and reference light, a scanning unit that scans the measurement light divided by the dividing unit on a predetermined part of the eye to be examined, An interference optical system for obtaining a tomographic image at a predetermined part of the eye to be examined, comprising: a first light receiving element that receives a light obtained by combining the reflected light of the measurement light irradiated to the predetermined part and the reference light When,
An illumination optical system for irradiating the predetermined part of the eye to be examined with illumination light; and a light receiving optical system for receiving reflected light from the predetermined part of the eye to be examined by a second light receiving element; An observation optical system for obtaining an image;
An image processing unit that acquires a tomographic image based on a light reception signal output from the first light receiving element and acquires a front image based on a light reception signal output from the second light receiving element;
In an ophthalmologic photographing apparatus comprising: a scanning position setting unit that sets a scanning position of measurement light by the scanning unit based on a predetermined signal;
Previously acquired tomographic image, the scanning position information of the measuring light, and the past front stored in the storage means for storing a front image obtained in association with the tomographic image when obtaining the tomographic image A misregistration detecting means for comparing an image with a current front image acquired by the image processing unit and detecting a misregistration direction and a misregistration amount of the current front image with respect to the past front image by image processing; ,
Correction means for acquiring the scanning position information from the storage means and correcting the scanning position information based on the positional deviation direction and the positional deviation amount detected by the positional deviation detection means;
The shift amount of the scan position between the current scan position information set by the scan position setting means and the corrected scan position information is sequentially detected, and the shift amount detected sequentially satisfies a predetermined allowable range. An ophthalmologic photographing apparatus comprising: a determination unit that determines whether or not.

The ophthalmologic photographing apparatus according to claim 1 .
A monitor for displaying the acquired image;
Display control means for displaying on the monitor that the adjustment of the scanning position is appropriate when it is determined by the determining means that the amount of deviation of the scanning position satisfies a predetermined allowable range. Ophthalmic imaging device.

The ophthalmologic photographing apparatus according to claim 1, further comprising an automatic photographing unit that automatically issues a trigger signal for starting photographing when the discriminating unit determines that the deviation amount satisfies a predetermined allowable range. An ophthalmologic photographing apparatus characterized by.

In the ophthalmologic photographing apparatus according to claims 1 to 3,
The display control means displays a currently acquired front image on the monitor, and indicates a target index as a target for adjusting a scanning position to substantially the same part as the past tomographic image, and a current scanning position. A display control means for displaying a scan line superimposed on the front image.
The display control means displays the target index at a position corresponding to the scanning position information corrected by the correction means, and changes the display position of the scan line according to the change of the scanning position by the scanning position setting means. An ophthalmologic photographing apparatus characterized by being made to perform.