JP2013180127A - Ophthalmologic photographing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic photographing apparatus capable of correctly and easily setting a scanning position with respect to a site desired by an examiner.SOLUTION: An ophthalmologic photographing apparatus includes: a photographing optical system which has a scanning unit for scanning measurement light emitted from a light source on an eye to be examined, to obtain a tomographic image of the eye to be examined; an observation optical system which has a light-receiving device for receiving reflected light from the eye to be examined to obtain a motion image of a front image of the eye to be examined on the basis of a light-receiving signal from the light-receiving device; a display control section for displaying the front image acquired by the observation optical system in a static state on a monitor, displaying the front image acquired thereby in a still state on the monitor and enabling setting of an acquisition position of the tomographic image, the setting using the front image; and a drive control section for controlling the scanning unit so that the tomographic image at the acquisition position set on the still image in the still state can be acquired.

Description

  The present invention relates to an ophthalmologic photographing apparatus for photographing a tomographic image of an eye to be examined.

  An optical coherence tomography (OCT) for ophthalmology using low-coherent light is used as an ophthalmic imaging apparatus that can obtain non-invasive tomographic images at a predetermined site (eg, fundus, anterior eye) of an eye to be examined. It is known (see, for example, Patent Document 1).

When acquiring a tomographic image, a moving image of a front image at a predetermined site is observed on a monitor, and a scanning position indicating a tomographic image acquisition position is moved on the moving image to set a scanning position. For example, the examiner captures a tomographic image by matching a scanning line with a portion considered to be a lesion in a moving image and pressing an imaging start switch.
JP 2008-29467 A

  However, since the front image moves on the monitor due to the subject's fixation fixation and breathing, it is difficult to accurately set the scanning position at the site desired by the examiner, which is a burden on the examiner. In addition, when imaging of a desired part fails, it is necessary to perform imaging again.

  In view of the above problems, it is an object of the present invention to provide an ophthalmologic imaging apparatus that can accurately and easily set the acquisition position of a tomographic image.

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) An imaging optical system that has scanning means for scanning measurement light emitted from a light source on the eye to be examined, and a light receiving element that receives reflected light from the eye to be examined, and a tomographic image of the eye to be examined An observation optical system for obtaining a moving image of a front image of the eye to be examined based on a light reception signal from the light receiving element, and the front image acquired by the observation optical system is displayed on a monitor in a moving state On the other hand, the front image is displayed on the monitor in a stationary state and the tomographic image acquisition position can be set on the front image displayed in the stationary state, and the still image in the stationary state Drive control means for controlling the scanning means so that a tomographic image at the acquisition position set above is acquired.
(2) The display control unit switches the front image displayed on the monitor in a moving state to a stationary state based on an operation signal input from the operation input unit, and performs an operation input from the operation input unit. The ophthalmologic photographing apparatus according to (1), wherein the tomographic image acquisition position can be set on a front image displayed in a stationary state based on a signal.
(3) When the setting on the front image displayed in the stationary state is completed, the display control means switches the front image displayed on the monitor in the stationary state to a live moving image (1). The ophthalmologic photographing apparatus according to any one of to (2).
(4) The drive control unit controls the drive of the scanning unit based on a live moving image acquired by the observation optical system, and is on the eye to be examined set on the front image displayed in the stationary state. The ophthalmologic photographing apparatus according to any one of (1) to (3), wherein the measurement light is tracked at the acquisition position of
(5) The drive control means detects, by image processing, a positional deviation between the live moving image acquired by the observation optical system and the front image used for setting the acquisition position in a stationary state. The ophthalmologic photographing apparatus according to any one of (1) to (4), wherein the driving of the scanning unit is controlled based on the scanning position to correct the scanning position.
(6) The display control unit superimposes and displays an index indicating the acquisition position of the tomographic image on the front image displayed in a stationary state, and based on an operation signal input from the operation input unit The ophthalmologic photographing apparatus according to any one of (1) to (5), wherein the index is moved on a front image and the scanning position of the measurement light can be set.
(7) When the scanning position is corrected by the drive control unit, the display control unit changes the display position of the index to a position corresponding to the corrected scanning position. Ophthalmic photography device.
(8) The observation optical system includes a light receiving element that irradiates the subject eye with infrared light and receives reflected light from the subject eye, and displays a front image of the subject eye based on a light reception signal from the light receiving element. The ophthalmic imaging apparatus according to any one of (1) to (7).
(9) The display control means captures the front image acquired by the observation optical system as a still image, displays the still image on the monitor as a front image in a stationary state, and indicates the acquisition position of the tomographic image. The ophthalmologic photographing apparatus according to any one of (1) to (8), which can be set on a still image.
(10) The display control means detects a displacement between the live moving image acquired by the observation optical system and the reference image, and corrects the display position of the live moving image on the monitor based on the detection result. By doing so, the ophthalmologic photographing apparatus according to any one of (1) to (9), wherein the live moving image is displayed on a monitor as a front image in a stationary state.

  According to the present invention, the scanning position can be accurately and easily set with respect to the site desired by the examiner.

  Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating the configuration of the ophthalmologic photographing apparatus according to the present embodiment. In the present embodiment, the axial direction of the subject's eye (eye E) will be described as the Z direction, the horizontal direction as the X direction, and the vertical direction as the Y direction. The surface direction of the fundus may be considered as the XY direction.

<Overview>
An outline of an ophthalmologic photographing apparatus according to an embodiment of the present invention will be described. An ophthalmologic photographing apparatus (optical coherence tomography device) 10 according to the present embodiment includes an interference optical system 100, an observation optical system 200, a display unit (monitor) 75, an operation input unit (operation unit) 74, a control unit (CPU) 70, Is provided.

  The interference optical system 100 includes a scanning unit (optical scanner) 108 and a detector 120, and obtains a tomographic image of the eye to be examined. The optical scanner 108 scans the light emitted from the light source 102 two-dimensionally on the eye to be examined. The detector 120 detects an interference state between the measurement light emitted from the light source and the reference light.

  The observation optical system 200 is used for acquiring a front image of a moving image of the eye to be examined. The observation optical system 200 includes a light receiving element that irradiates the eye to be examined with infrared light and receives reflected light from the eye to be examined, and obtains a front image of the eye to be examined based on a light reception signal from the light receiving element. Can be mentioned. For example, SLO and a fundus camera can be mentioned. Further, the interference optical system 100 may be used as the observation optical system 200. In this case, a front eye image is acquired based on the three-dimensional image acquired by the interference optical system 100.

  When the observation optical system 200 is an SLO or a fundus camera, the control unit 70 uses the front image acquired by the observation optical system 200 and the front image acquired by the interference optical system 100 (for example, based on three-dimensional image data). Alignment (matching) with the OCT front image (for example, integrated image)). Thereby, the tomographic image acquired by the interference optical system 100 and the front image acquired by the front image observation optical system 200 are associated with each other.

  The operation unit 74 is operated by an examiner. For the operation unit 74, for example, a user interface such as a mouse 74a, a trackball, or a touch panel is used.

  The monitor 75 is used for displaying a front image acquired by the observation optical system 200. As the monitor 75, for example, a display provided in a PC or a display provided in an ophthalmologic photographing apparatus is used. The monitor 75 may be a touch panel. When the monitor 75 is a touch panel, the monitor 75 functions as an operation unit.

  The control unit 70 displays the front image 20 acquired by the observation optical system 200 on the monitor 75. For example, the front image 20 acquired by the observation optical system 200 is displayed on the monitor 75 as a moving image as needed.

<Scanning position setting>
When selecting a site for acquiring a tomographic image, the selection is performed on the front image 20 acquired by the observation optical system 200.

  The control unit 70 displays the front image acquired by the observation optical system 200 on the monitor 75 in a moving state, displays the front image on the monitor 75 in a stationary state, and sets the acquisition position of the tomographic image to a stationary state. Can be set on the front image displayed.

  For example, a still image is mentioned as a front image in a still state. The moving front image is a live moving image. The control unit 70 displays the front image acquired by the observation optical system 200 on the monitor 75 as a moving image, and displays the still image on the monitor 75 by taking the front image acquired by the observation optical system 200 as a still image. In addition, the acquisition position of the tomographic image can be set on the still image.

  For example, when the operation unit 74 is operated by the examiner, the control unit 70 switches the moving image displayed on the monitor 75 to a still image based on an operation signal input from the operation unit 74, and also operates the operation unit 74. The tomographic image acquisition position can be set on the still image on the basis of the operation signal input from. Then, the examiner operates the operation unit 74 on the still image to designate a predetermined area. At this time, for example, the control unit 70 superimposes and displays an index indicating the acquisition position of the tomographic image on the still image, and moves the index on the still image based on the operation signal input from the operation unit 74. The scanning position of the measurement light can be set.

  When the predetermined area is designated by the examiner, based on the operation signal from the operation unit 74, the control unit 70 sets the predetermined area (acquisition position) designated (set) on the still image of the measurement light by the optical scanner 108. Set as scanning position.

  Then, when the setting on the still image is completed, the control unit 70 switches the still image displayed on the monitor 75 to the live moving image.

  As an operation of the operation unit 74, for example, when switching between a moving image displayed on the monitor 75 and a still image, the examiner changes the moving image and the still image by dragging or clicking the mouse 74a. To do.

  For example, when designating the scanning position, for example, the control unit 70 can move a pointer (for example, a cross mark, a dot mark, a pen mark, etc.) on the front image based on an operation signal input from the operation unit 74. Is displayed on the monitor 75. Then, by moving the pointer, the index (scanning position) is moved on the front image, and the scanning position of the measurement light is set.

  At this time, for example, when the front image displayed on the monitor 75 is a still image by dragging the mouse 74a, the examiner designates the scanning position by stopping the drag operation of the mouse 74a. Can be mentioned. When the drag operation of the mouse 74a is stopped, the area where the index on the front image on the monitor 75 is located is set as the scanning position. Further, when the front image displayed on the monitor 75 is a still image by the click operation of the mouse 74a, the scanning position may be designated by the click operation. Of course, a drag operation and a click operation may be combined.

<Tracking control>
When the scanning position is designated, the control unit 70 controls the optical scanner 108 so that a tomographic image at the acquisition position set on the still image is acquired. Then, the control unit 70 controls the driving of the optical scanner 108 based on the live moving image acquired by the observation optical system 200, and tracks the measurement light to the acquisition position on the eye to be examined set on the still image.

  For example, when the scanning position is designated, the control unit 70 causes the memory 72 to store the front image when the scanning position is set and the scanning position information of the scanning position. While the scanning position is designated, the still image displayed on the monitor 75 can be switched to the live moving image.

  The control unit 70 detects a positional shift between the live moving image acquired by the observation optical system 200 and the still image used for setting the acquisition position by image processing, and controls the driving of the optical scanner 108 based on the detection result. Then, the scanning position is corrected.

  For example, the positional deviation includes a positional deviation direction, a rotational deviation, and a positional deviation amount. The control unit 70 compares the front image stored in the memory 72 with the current front image on the moving image, and detects a positional shift between the front images by image processing.

  The control unit 70 controls the driving of the optical scanner 108 based on the detected detection result, and corrects the scanning position. The controller 70 sequentially corrects the scanning position. That is, the control unit 70 performs a tracking operation so that a tomographic image at the set scanning position is acquired.

  At this time, for example, when the scanning position is corrected by drive control of the optical scanner 108, the control unit 70 changes the display position of the index to a position corresponding to the corrected scanning position.

  In this way, only when setting the scanning position, the moving image is switched to the stationary state, and the scanning position can be set on the front image in the stationary state. The scanning position can be set accurately and easily.

  In the above description, a still image is used as a still image, but the present invention is not limited to this. For example, the control unit 70 detects a positional deviation between the live moving image acquired by the observation optical system 200 and the reference image acquired in advance, and displays the live moving image on the monitor 75 based on the detection result. By correcting the position, the live moving image may be displayed on the monitor 75 as a still front image. In this case, for example, a reference image is used as an image used for tracking.

<Nipple tracking control>
Note that an initial position at which scanning is started is set in advance in accordance with the characteristic part to be imaged, and then the scanning position is corrected.

  The control unit 70 processes a tomographic image or a front image acquired in advance and detects a characteristic part having the eye to be examined by image processing. The control unit 70 sets the acquisition position of the tomographic image on the front image based on the detected position of the characteristic part. The control unit 70 detects a positional shift between the live moving image acquired by the observation optical system 200 and the front image in which the acquisition position of the tomographic image is set, and drives the optical scanner 108 based on the detection result. And the scanning position with respect to the characteristic part is corrected. The correspondence between the scanning position of the optical scanner 108 and the front image is determined in advance.

  For example, the control unit 70 sets the front image in which the tomographic image acquisition position is set as the reference image, and causes the memory 72 to store the reference image and the scan position information of the initial position. The control unit 70 compares the reference image stored in the memory 72 with the current front image acquired by the observation optical system 200, and detects the positional deviation of the current front image with respect to the reference image by image processing. Then, the control unit 70 controls driving of the optical scanner 108 based on the positional deviation, and corrects the scanning position.

  For example, examples of the characteristic part include the optic nerve head, the macula, and a lesioned part.

  In the case of the optic nerve head, the control unit 70 detects the optic nerve head from the tomographic image or the front image, and sets the acquisition position of the tomographic image on the front image based on the detected position of the optic nerve head. The control unit 70 detects a positional shift between the live moving image acquired by the observation optical system 200 and the front image in which the acquisition position of the tomographic image is set, and drives the optical scanner 108 based on the detection result. Control and correct the scan position relative to the optic disc.

  For example, in the setting of the tomographic image acquisition position, the control unit 70 sets a circle-shaped region that is a predetermined distance away from the center of the optic disc as the tomographic image acquisition position based on the detected position of the optic disc. Is mentioned.

  In the case of macular, the control unit 70 detects the macula from the tomographic image or the front image, and sets the acquisition position of the tomographic image on the front image based on the detected position of the macular. The control unit 70 detects a positional shift between the live moving image acquired by the observation optical system 200 and the front image in which the acquisition position of the tomographic image is set, and drives the optical scanner 108 based on the detection result. Control and correct the scan position for the macula.

  In addition, for example, the detection of the characteristic part may be performed using an algorithm such as edge detection or Hough transform. Further, the detection of the characteristic part is performed by extracting a specific part such as a luminance change, a shape, and a size of the characteristic part from the image by image processing.

  As a result, when correcting the scanning position, it is not necessary to detect the characteristic part each time the scanning position is corrected, so that the scanning position can be corrected quickly. In addition, it is possible to reduce the possibility of misdetection of misregistration detection due to erroneous detection of feature parts. Therefore, it is possible to correct the scanning position with high accuracy. Further, even when the photographing range is greatly changed and the characteristic portion cannot be detected, the correction of the scanning position can be made with high probability.

<Shooting setting change technology>
While the positional deviation between the front images is detected and the scanning position is being corrected by the drive control of the optical scanner 108, the examiner changes the shooting settings (shooting conditions) at the time of shooting by operating the operation unit 74. Can do. For example, the scanning setting (scanning condition) relating to the scanning operation of the measurement light is changed as the imaging setting. The control unit 70 presets the tomographic image acquisition position on the front image displayed on the monitor 75 and is set. It is possible to set a scanning condition of measurement light when acquiring a tomographic image at the acquisition position.

  The control unit 70 controls the driving of the optical scanner 108 based on the live moving image acquired by the observation optical system 200, and tracks the measurement light to the set acquisition position on the eye under the first scanning condition. . When tracking is performed under the first scanning condition and then the measurement light scanning condition is changed, the control unit 70 performs the tracking under the first scanning condition and sets the target to be set in advance by the control unit 70. The measurement light is tracked at a second scanning condition different from the first scanning condition at the acquisition position on the optometry.

  For example, when tracking the measurement light under the first scanning condition, the control unit 70 detects the positional deviation between the live moving image acquired by the observation optical system 200 and the previously acquired still image by image processing, The driving of the optical scanner 108 is controlled based on the detection result. In addition, the control unit 70 performs tracking under the first scanning condition, and then changes the live moving image acquired by the observation optical system 200 and the first scanning condition when the measurement light scanning condition is changed. A positional deviation from the still image used for tracking is detected by image processing. Then, the control unit 70 controls the driving of the optical scanner 108 based on the detection result, and tracks the measurement light under the second scanning condition.

  For example, at least one of a scanning pattern, the number of scanning lines, a rotation angle of the scanning pattern, and a scanning width can be set (changeable) as the scanning condition.

  For example, when changing the scanning pattern, the control unit 70 superimposes an index indicating the scanning pattern on the front image based on the scanning pattern and displays it on the monitor 75, and changes the display pattern of the index according to the change of the scanning pattern. change. For example, the index is an index indicating the scanning position of the measurement light. When the scanning position is corrected by the drive control of the optical scanner 108, the control unit 70 displays the index at a position corresponding to the corrected scanning position. Change position.

  As described above, since the scanning condition can be changed during the tracking operation, when the scanning condition is changed in the same part, it is not necessary to adjust the scanning position again. It can be easily acquired with a simple pattern and does not require time and effort. In addition, it is possible to avoid setting scanning positions of different parts, and it is possible to perform scanning with high accuracy. Moreover, since the scanning pattern can be changed according to the imaging region, convenience is high.

  In addition, it is good also as a structure which changes the number or position of at least one of the starting point which starts the scanning of measuring light, or the end point which complete | finishes the scanning of measuring light according to a specific site | part. For example, the control unit 70 detects the position of the specific part from the front image acquired by the observation optical system 200, and sets the scanning pattern of the measurement light according to the specific part.

<Tomographic imaging>
When the scanning position is set, shooting is performed. When the operation unit 74 is operated by the examiner, the control unit 70 captures a tomographic image acquired by the interference optical system 100 based on an operation signal from the operation unit 74 and stores the tomographic image in the memory 72.

  For example, after the operation signal from the operation unit 74 is input, the control unit 70 determines whether or not the positional deviation between the live moving image and the front image used for detecting the characteristic part satisfies a predetermined allowable range. The tomographic image is captured using the determination result and stored in the memory 72.

  For example, the storage of the tomographic image in the memory 72 may be determined each time a tomographic image is sequentially acquired, and processing for determining whether to store in the memory 72 may be performed. Further, the determination is performed every time the tomographic images are acquired, and the determination result is associated with the tomographic images and temporarily stored in the memory 72. Then, after all the tomographic images are acquired in the memory 72, the tomographic images stored in the memory 72 may be selected using the determination result associated with the tomographic image.

  Note that when the control unit 70 determines that the deviation amount does not satisfy the predetermined allowable range, the control unit 70 determines that the positional deviation between the live moving image and the front image used for detecting the characteristic portion falls within the predetermined allowable range. The driving of the optical scanner 108 is controlled so as to satisfy the condition, and the scanning position is corrected. Then, the control unit 70 captures a tomographic image when the positional deviation satisfies a predetermined allowable range and stores it in the memory 72.

  As a result, even if the scanning position is shifted after the scanning position is set until the image is acquired, the tomographic image at the set scanning position can be acquired with high accuracy. In addition, the possibility of measuring different positions is reduced.

<Example>
Hereinafter, examples according to the present embodiment will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating the configuration of the ophthalmologic photographing apparatus according to the present embodiment. In the following description, a fundus imaging apparatus that performs fundus imaging of the eye to be examined will be described as an example of an ophthalmologic imaging apparatus. Of course, the ophthalmologic imaging apparatus is not limited to the fundus imaging apparatus, and includes an anterior ocular segment imaging apparatus that performs anterior segment imaging of the eye to be examined.

  An outline of the apparatus configuration will be described. This apparatus is an optical coherence tomography device (OCT device) 10 for taking a tomographic image of the fundus oculi Ef of the subject's eye E. The OCT device 10 includes an interference optical system (OCT optical system) 100, a front observation optical system 200, a fixation target projection unit 300, and an arithmetic control unit (CPU) 70.

  The OCT optical system 100 irradiates the fundus with measurement light. The OCT optical system 100 detects the interference state between the measurement light reflected from the fundus and the reference light by the light receiving element (detector 120). The OCT optical system 100 includes an irradiation position changing unit (for example, the optical scanner 108 and the fixation target projection unit 300) that changes the irradiation position of the measurement light on the fundus oculi Ef in order to change the imaging position on the fundus oculi Ef. The control unit 70 controls the operation of the irradiation position changing unit based on the set imaging position information, and acquires a tomographic image based on the light reception signal from the detector 120.

<OCT optical system>
The OCT optical system 100 has an apparatus configuration of a so-called ophthalmic optical tomography (OCT: Optical coherence tomography) and takes a tomographic image of the eye E. The OCT optical system 100 splits the light emitted from the measurement light source 102 into measurement light (sample light) and reference light by a coupler (light splitter) 104. The OCT optical system 100 guides the measurement light to the fundus oculi Ef of the eye E by the measurement optical system 106 and guides the reference light to the reference optical system 110. Thereafter, the detector (light receiving element) 120 receives the interference light obtained by combining the measurement light reflected by the fundus oculi Ef and the reference light.

  The detector 120 detects an interference state between the measurement light and the reference light. In the case of Fourier domain OCT, the spectral intensity of the interference light is detected by the detector 120, and a depth profile (A scan signal) in a predetermined range is obtained by Fourier transform on the spectral intensity data. Examples include Spectral-domain OCT (SD-OCT) and Swept-source OCT (SS-OCT). Moreover, Time-domain OCT (TD-OCT) may be used.

  The optical scanner 108 scans light emitted from the measurement light source on the eye fundus. For example, the optical scanner 108 scans the measurement light two-dimensionally (XY direction (transverse direction)) on the fundus. The optical scanner 108 is arranged at a position substantially conjugate with the pupil. The optical scanner 108 is, for example, two galvanometer mirrors, and the reflection angle thereof is arbitrarily adjusted by the drive mechanism 50.

  Thereby, the reflection (advance) direction of the light beam emitted from the light source 102 is changed, and is scanned in an arbitrary direction on the fundus. Thereby, the imaging position on the fundus oculi Ef is changed. The optical scanner 108 may be configured to deflect light. For example, in addition to a reflective mirror (galvano mirror, polygon mirror, resonant scanner), an acousto-optic device (AOM) that changes the traveling (deflection) direction of light is used.

  The reference optical system 110 generates reference light that is combined with reflected light acquired by reflection of measurement light at the fundus oculi Ef. The reference optical system 110 may be a Michelson type or a Mach-Zehnder type. The reference optical system 110 is formed by, for example, a reflection optical system (for example, a reference mirror), and reflects light from the coupler 104 back to the coupler 104 by being reflected by the reflection optical system and guides it to the detector 120. As another example, the reference optical system 110 is formed by a transmission optical system (for example, an optical fiber), and guides the light from the coupler 104 to the detector 120 by transmitting the light without returning.

  The reference optical system 110 has a configuration in which the optical path length difference between the measurement light and the reference light is changed by moving an optical member in the reference optical path. For example, the reference mirror is moved in the optical axis direction. The configuration for changing the optical path length difference may be arranged in the measurement optical path of the measurement optical system 106.

<Front observation optical system>
The front observation optical system (front image observation device) 200 is provided to obtain a front image of the fundus oculi Ef. The observation optical system 200 includes, for example, an optical scanner that two-dimensionally scans the fundus of measurement light (for example, infrared light) emitted from a light source, and a confocal aperture that is disposed at a position substantially conjugate with the fundus. And a second light receiving element for receiving the fundus reflection light, and has a so-called ophthalmic scanning laser ophthalmoscope (SLO) device configuration.

  Note that the configuration of the observation optical system 200 may be a so-called fundus camera type configuration. The OCT optical system 100 may also serve as the observation optical system 200. That is, the front image may be acquired using data forming a tomographic image obtained two-dimensionally (for example, an integrated image in the depth direction of a three-dimensional tomographic image, at each XY position). Of the spectrum data, luminance data at each XY position in a certain depth direction, retina surface layer image, etc.).

<Fixation target projection unit>
The fixation target projecting unit 300 includes an optical system for guiding the line-of-sight direction of the eye E. The projection unit 300 has a fixation target presented to the eye E, and can guide the eye E in a plurality of directions.

  For example, the fixation target projection unit 300 has a visible light source that emits visible light, and changes the presentation position of the target two-dimensionally. Thereby, the line-of-sight direction is changed, and as a result, the imaging region is changed. For example, when the fixation target is presented from the same direction as the imaging optical axis, the center of the fundus is set as the imaging site. When the fixation target is presented upward with respect to the imaging optical axis, the upper part of the fundus is set as the imaging region. That is, the imaging region is changed according to the position of the target with respect to the imaging optical axis.

  As the fixation target projection unit 300, for example, a configuration in which the fixation position is adjusted by the lighting positions of LEDs arranged in a matrix, light from a light source is scanned using an optical scanner, and fixation is performed by lighting control of the light source. Various configurations such as a configuration for adjusting the position are conceivable. The projection unit 300 may be an internal fixation lamp type or an external fixation lamp type.

<Control unit>
The control unit 70 controls the entire apparatus such as each member of each configuration 100 to 300. The control unit 70 also serves as an image processing unit that processes the acquired image, an image analysis unit that analyzes the acquired image, and the like. The control unit 70 is realized by a general CPU (Central Processing Unit) or the like. As shown below, the control unit 70 analyzes the fundus oculi Ef based on the tomographic image.

  The control unit 70 obtains a tomographic image by image processing based on the light reception signal output from the detector 120 of the OCT optical system 100, and also detects the front surface based on the light reception signal output from the light receiving element of the front observation optical system 200. Get a statue. Further, the control unit 70 controls the fixation target projection unit 300 to change the fixation position.

  The memory (storage unit) 72, the monitor 75, and the control unit (operation unit) 74 are electrically connected to the control unit 70, respectively. The control unit 70 controls the display screen of the monitor 75. The acquired fundus image is output to the monitor 75 as a still image or a moving image and stored in the memory 72. For example, the memory 72 records various types of information related to imaging such as a captured tomographic image (for example, a three-dimensional tomographic image), a front image, and imaging position information of each tomographic image. The control unit 70 controls each member of the OCT optical system 100, the front observation optical system 200, and the fixation target projection unit 300 based on the operation signal output from the control unit 74. The control unit 74 is connected to a mouse 74a and operation knobs 74b and 74c as operation members operated by the examiner.

  The mouse 74a has a sensor for detecting a movement signal when the body of the mouse 74a is two-dimensionally moved by the examiner's hand, and detects that the examiner's hand is pressed by the examiner's hand. There are two left and right mouse buttons and a wheel mechanism that is rotatable in the front-rear direction between the two left and right mouse buttons.

  The operation knobs 74b and 74c are configured to be rotatable in the left-right direction.

  The monitor 75 may be a display monitor mounted on the apparatus main body or a display monitor of a personal computer. Moreover, the structure in which these were used together may be sufficient.

<Control action>
The control operation of the apparatus having the above configuration will be described. The examiner instructs the subject to gaze at the fixation target of the fixation target projection unit 300, and then observes the anterior ocular segment observation image captured by the anterior ocular segment observation camera (not shown) on the monitor 75. The alignment operation is performed using a joystick (not shown) so that the measurement optical axis is at the center of the pupil of the eye to be examined.

  Then, the control unit 70 controls driving of the optical scanner 108, scans the measurement light on the fundus in a predetermined direction, and receives a light reception signal corresponding to a predetermined scanning area from an output signal output from the detector 120 during the scanning. To obtain a tomographic image. The control unit 70 also controls the OCT optical system 100 to acquire a tomographic image, and also controls the observation optical system 200 to acquire a fundus front image. And the control part 70 acquires a tomographic image by the OCT optical system 100, and a fundus front image by the observation optical system 200 at any time.

  FIG. 2 is a diagram illustrating an example of a display screen displayed on the monitor 75. The control unit 70 displays the front image 20, the index 25, and the tomographic image 30 acquired by the observation optical system 200 on the monitor 75. The line 25 is an index representing the measurement position (acquisition position) of the tomographic image on the front image 20. The line 25 is electrically displayed on the front image on the monitor 75.

  The control unit 70 displays on the monitor 75 a pointer 21 (for example, a cross mark, a dot mark, a pen mark, etc.) that can be moved on the monitor 75 at any time based on an operation signal from the operation unit 74. Also, in this embodiment, the examiner operates the mouse 74a and performs a click operation or a drag operation in a state where the pointer 21 is placed on the front image 20, so that the photographing condition can be set. ing. In this case, the pointer 21 is used for designating an arbitrary position on the monitor 75.

<Scanline settings>
FIG. 3 is a diagram for explaining setting of the scanning position. FIG. 4 shows a flowchart of the scan line setting operation. When the tomographic image and the front image are displayed on the same screen, the examiner sets the position of the tomographic image that the examiner wants to photograph from the front image on the monitor 75 observed in real time. Here, the examiner moves the line 25 with respect to the front image by performing a drag operation using the mouse 74a, and sets the scanning position. If the line 25 is set to be in the X direction, a tomographic image on the XZ plane is taken, and if the line 25 is set to be in the Y direction, a tomographic image on the YZ plane is taken. It has become. Further, the line 25 may be set to an arbitrary shape (for example, an oblique direction or a circle) (details will be described later).

  When the line 25 is moved with respect to the front image 20 by the examiner, the control unit 70 sets a scanning position at any time and acquires a tomographic image at the corresponding scanning position. Then, the acquired tomographic image is displayed on the display screen of the monitor 75 as needed. In addition, the control unit 70 changes the scanning position of the measurement light based on the operation signal output from the mouse 74a, and displays the line 25 at the display position corresponding to the changed scanning position.

<Setting the scanning position for still images>
Here, a method for setting the scanning position will be described. The scanning position is set on the moving image or the still image of the front image 20. In the following, a case where it is performed on a still image will be described. When a predetermined operation is performed by the examiner, the control unit 70 switches the moving image of the front image 20 displayed on the monitor 75 to a still image. Then, the control unit 70 can set the scanning position on the still image.

  For example, the control unit 70 displays the moving image of the front image 20 on the monitor 75 by updating the front images sequentially acquired by the observation optical system 20. When the drag operation on the front image 20 is started in the state where the moving image is displayed, the control unit 70 captures (captures) the front image acquired by the observation optical system 20 as a still image. Are stored in the memory 72. The control unit 70 displays the still image of the front image stored in the memory 72 on the monitor 75 instead of the moving image. Further, the control unit 70 moves the line 25 to the position where the pointer 21 is displayed.

  The examiner moves the line 25 on the still image of the front image 20 by moving the mouse 74a while performing the drag operation (see FIG. 3A). Further, the control unit 70 may change the scanning pattern, the rotation angle of the scanning pattern, and the scanning width (scanning length) in the still image based on a predetermined operation signal.

  Then, when the drag operation of the mouse 74a (for example, the input of the mouse button is released) is released, the control unit 70 scans the part where the line 25 is positioned on the still image of the front image 20 for tracking. The position is set (see FIG. 3B). The control unit 70 stores the scan position information set on the still image in the memory 72 together with the still image of the front image 20.

<Acquisition of tomographic images>
When the setting of the scanning position on the still image is completed, the control unit 70 switches the front image 20 displayed on the monitor from the still image to the moving image. The control unit 70 switches the still image of the front image displayed on the monitor 75 to the current front image acquired in real time by the observation optical system 200. Each time the front image is acquired by the observation optical system 200, the front image is updated.

  The control unit 70 acquires a tomographic image by B scan based on the set scanning position. Based on the display position of the line 25 set on the front image 20, the control unit 70 drives the optical scanner 108 to scan the measurement light so that a tomographic image of the fundus corresponding to the position of the line 25 is obtained. Let Since the relationship between the display position of the line 25 (coordinate position on the monitor) and the scanning position of the measurement light by the optical scanner 108 is determined in advance, the control unit 70 corresponds to the set display position of the line 25. The two galvanometer mirrors of the optical scanner 108 are appropriately driven and controlled so that the measurement light is scanned with respect to the scanning range.

<Tracking control>
After setting the scanning position, the control unit 70 corrects the scanning position each time the moving image front image is updated. For example, when the front image is shifted from the scanning position due to fixation eye movement of the eye to be examined, it is necessary to correct the scanning position in order to obtain a tomographic image at the same position as the position where the scanning position is set. is there. The control unit 70 starts tracking control. When the scanning position is set, the control unit 70 corrects the scanning position using the front image stored in the memory 72 and the scanning position information.

  For example, the control unit 70 compares the still image of the front image used for the setting of the scanning position with the current front image, and the positional deviation direction and the positional deviation of the current front image with respect to the still image of the front image. The amount is detected (calculated) by image processing. For example, the control unit 70 uses the still image data of the front image at the time of setting the scanning position as a reference image, and calculates a position shift direction and a position shift amount between the reference image and the front image acquired in real time. Thereby, positional deviation information with respect to the still image is obtained.

  When the position shift direction and the position shift amount are detected as described above, the control unit 70 appropriately controls the two galvanometer mirrors of the optical scanner 108 so that the scan position shift is corrected. Thereby, the scanning position is corrected. As shown in FIG. 5, when the scanning position is corrected, the control unit 70 displays the corrected scanning position (line 25 ′) on the front image. As described above, even when the eye to be examined is displaced, the scanning position is corrected, and a tomographic image of the same part as the part where the scanning position is set is always acquired.

  Here, when an imaging start switch (release switch) (not shown) is input, the control unit 70 captures (captures) a still image of the tomographic image and stores it in the memory 72. In addition, the still image of the acquired tomographic image is displayed on the monitor 75.

  In this way, since the scanning position can be set using a still image switched from the moving image, the scanning position to the site desired by the examiner can be adjusted accurately and easily. In addition, a tomographic image corresponding to a desired part can be reliably acquired by tracking control with respect to the scanning position set in the still image.

  Such control is particularly advantageous for obtaining an addition average image of a desired part in a case where a plurality of tomographic images relating to the same part are acquired and an addition average image is acquired.

  Note that while the front image is displayed as a still image, a tomographic image corresponding to the scanning position of the front image may be sequentially displayed on the monitor 75. In this case, for example, when the line 25 is moved on the still image of the front image, a tomographic image at the position of the line 25 is acquired and displayed. For example, with respect to the still image of the front image, a positional deviation of the current front image acquired by the observation optical system 200 is detected, and the scanning position is corrected. Thereby, a tomographic image corresponding to the position of the line 25 on the still image of the front image is acquired and displayed. By doing so, the scanning position can be set while observing the tomographic image at the line 25, so that it becomes easy for the examiner to acquire a tomographic image of a desired part. Note that the control unit 70 may acquire the addition average image using a plurality of tomographic images acquired during setting of the scanning position on the still image. Further, the acquired addition average image may be displayed on the monitor 75 in real time.

  In the present embodiment, the tracking control start timing is configured to start after the scanning position is set, but is not limited thereto. After the scanning position is set, tracking control may be started when the operation unit 74 is operated by the examiner and a predetermined trigger signal is output. For example, after the scanning position is set, tracking control may be started when the examiner moves the pointer 21 to the line 25 on the still image of the front image and performs a click operation. In this case, when a click operation is performed, the control unit 70 controls the optical scanner 108 and starts correcting the scanning position.

<Change of scanning condition in tracking state>
In this embodiment, after setting the scanning position, the examiner can change the imaging condition (for example, the scanning condition). As described above, when the scanning position is set, the control unit 70 corrects the scanning position so that a tomographic image of the same part as the set scanning position can be acquired every time the front image is updated. At this time, the examiner can change the imaging conditions by operating the operation unit 74. That is, the control unit 70 can change the shooting conditions under tracking control. Hereinafter, the change of the imaging condition will be described by taking the change of the scanning condition as an example.

  Examples of changes in scanning conditions include changes in scan length (scan width), scan pattern (scan pattern), scan pattern rotation angle (a line is rotated around the scan center), and the like.

  When the first scanning condition is set, the control unit 70 compares the still image of the front image acquired in advance with the current front image, and the position of the current front image with respect to the still image of the front image. The displacement direction and the amount of displacement are detected (calculated) by image processing. The still image here is not limited to the still image switched from the moving image on the monitor 75 as described above, and includes a still image of the front image acquired at a certain timing.

  When the position shift direction and the position shift amount are detected, the control unit 70 appropriately controls driving of the two galvanometer mirrors of the optical scanner 108 so that the shift of the scan position under the first scan condition is corrected. As a result, the scanning position under the first scanning condition is corrected. As shown in FIG. 5, when the scanning position is corrected, the control unit 70 displays the corrected scanning position (line 25 ′) on the front image. Here, when an imaging start switch (release switch) (not shown) is input, the control unit 70 captures (captures) a still image of a tomographic image under the first scanning condition, and stores it in the memory 72. In addition, the still image of the acquired tomographic image is displayed on the monitor 75.

  When the scanning condition is changed under the tracking under the first scanning condition as described above, the control unit 70 performs tracking under the changed second scanning condition. FIG. 6 is a diagram for explaining the change of the scan length and the scan angle. When the scan length or the scan angle is changed, the examiner operates the operation knobs 74b and 74c. For example, when the operation knob 74b is rotated by the examiner, the control unit 70 controls the optical scanner 108 and changes the scan length. In this case, for example, when the operation knob 74b is rotated to the right, the scan length is increased, and when the operation knob 74b is rotated to the left, the scan length is decreased (see FIG. 6A).

  When the operation knob 74c is rotated by the examiner, the control unit 70 changes the scan angle with the scan center position indicating the center position of the scan line as the rotation center. In this case, for example, when the operation knob 74c is rotated in the right direction, the scan line is rotated in the right direction around the scanning center position of the scan line, and when the operation knob 74c is rotated in the left direction, the scan line is scanned. Rotates leftward (see FIG. 6B). As a result, the scan angle is changed. The scan length and the scan angle may be changed by operating another operation unit such as a mouse.

  FIG. 7 is a diagram for explaining the change of the scanning pattern. FIG. 7 shows an example in which the scanning pattern is changed from line scanning to cross scanning. When changing the scanning pattern, the examiner operates the mouse 74a, selects a desired scanning pattern from the OCT setting column 60 displayed on the monitor 75, and changes the scanning pattern. In the OCT setting column 60, various scanning patterns are listed. For example, as the scanning pattern, a cross scan, a circle scan, a raster scan, a radial scan, or the like can be considered. It is also possible to change to a scan corresponding to the imaging region (macular scan, nipple scan). When performing scanning while changing the imaging region, the control unit 70 controls the fixation target projection unit 300 to guide the line-of-sight direction of the eye E so that a desired region can be imaged.

  When the examiner operates the mouse 74a and selects a predetermined scanning pattern in the OCT setting column 60 displayed on the monitor 75, the control unit 70 changes to the selected scanning pattern. . At this time, the scanning center position is set in advance for each scanning pattern, and the control unit 70 changes the scanning pattern so that the scanning center position of the past scanning pattern matches the scanning center position of the selected scanning pattern. To do. When the scanning position is not changed, tomographic images regarding the same part on the fundus are acquired with different scanning patterns.

  The control unit 70 continues the tracking control even during the change of the scanning condition as described above. When the scanning condition is changed, the control unit 70 compares, for example, the same still image as the front image used for correction (tracking) of the scanning position under the first scanning condition with the current front image. The position shift of the current front image with respect to the still image of the front image is detected (calculated) by image processing. When the positional deviation is detected, the control unit 70 appropriately drives and controls the two galvanometer mirrors of the optical scanner 108 so that the deviation of the scanning position under the second scanning condition is corrected. Thereby, the scanning position under the second scanning condition is corrected.

  As described above, the examiner can change the scanning condition while the tracking control is being performed. Based on the changed scanning condition, the control unit 70 adjusts the scanning position to be the same position as the scanning center where the tomographic image was acquired under the first scanning condition, and acquires the tomographic image. Continue to do. That is, even when the scanning condition is changed, tracking control based on the scanning center set before the change is repeatedly performed.

  When an imaging start switch (release switch) (not shown) is input, the control unit 70 captures (captures) a still image of a tomographic image under the second scanning condition and stores it in the memory 72. In addition, the still image of the acquired tomographic image is displayed on the monitor 75.

  As described above, since the scanning condition can be changed during the tracking control, it is not necessary to adjust the scanning position again when the scanning condition is changed. For this reason, for example, a tomographic image at the same site (for example, a lesioned part) on the fundus can be easily acquired in various patterns, and this does not require labor. In addition, it is possible to avoid setting different scanning positions on the fundus and to perform scanning with high accuracy. Further, since the scanning position can be changed from the same part to a scanning pattern corresponding to the photographing part, the convenience is high.

  Also, by tracking the scanning position using the same still image as described above, the positional relationship with respect to the fundus oculi under the first scanning condition and the second scanning condition is made common. It is advantageous.

  In this embodiment, the scanning condition is changed as an example, but the present invention is not limited to this. The present invention is applicable as long as the shooting conditions during shooting are changed. For example, when the fixation of the subject is not stable during photographing, the fixation target conditions (for example, fixation target pattern, fixation target size, fixation position) are changed. May be. In this case, it is possible to control the fixation target projection unit 300 during tracking control and change the size and pattern of the fixation target.

<Shooting operation (semi-auto shot)>
When the scanning position is set and an imaging start switch (not shown) is pressed by the examiner, the control unit 70 determines whether to perform imaging based on the detected positional deviation, and determines the tomography according to the determination result. Controls image capture (capture).

  For example, when it is determined that the sequentially detected positional deviation satisfies a predetermined allowable range, the control unit 70 automatically issues a trigger signal for starting imaging (image capturing). When the trigger signal is generated, the control unit 70 causes the memory 72 to store the tomographic image acquired at the timing when the trigger signal is generated as a still image.

  Further, when the control unit 70 determines that the positional deviation exceeds the predetermined allowable range, the control unit 70 drives and controls the optical scanner 108 to correct the scanning position again. Then, when the controller 70 determines that the positional deviation amount satisfies the predetermined allowable range, the controller 70 automatically issues a trigger signal for starting imaging and performs tomographic imaging.

  As a result, even if the scanning position is shifted after the scanning position is set until the image is acquired, the tomographic image at the set scanning position can be acquired with high accuracy. In addition, the possibility of measuring different positions is reduced.

<Transformation example>
Hereinafter, a modification example related to the present embodiment will be described. In the modification example, a case where imaging is performed at a characteristic part of the eye to be examined will be described as an example. In the following description, a case where imaging is performed in the optic disc portion (papillae) as the characteristic portion will be described as an example.

<Automatic teat detection>
The control unit 70 controls the observation optical system 200 and acquires a front image including the nipple. The control unit 70 detects the nipple from the acquired front image.

  In the front image, the nipple appears with a luminance change (bright / dark) not found in other fundus sites. The control unit 70 detects a part having a luminance level lower than the predetermined level or a part higher than the predetermined level by image processing, and specifies the nipple. The nipple is identified by, for example, performing edge detection from a luminance change and detecting the outer edge of the nipple.

  The control unit 70 detects the nipple in the front image and calculates the center position of the detected nipple. For example, in calculating the center coordinates of the nipple, the outer edge of the nipple is approximated by a circle, and the center coordinates of the approximate circle are detected. Then, the detected center coordinates of the approximate circle are treated as the center coordinates of the nipple.

<Manual change of nipple detection position>
After detecting the nipple, the control unit 70 sets an initial position of the scanning position. The control unit sets a scanning position at which the center position of the nipple coincides with the scanning center position as an initial position. The control unit 70 causes the memory 72 to store the still image of the front image used for nipple detection and the scanning position information set on the front image.

  When the initial position is set, the control unit 70 acquires a tomographic image at the initial position and displays it on the monitor 75 together with the front image. In addition, after the initial position is set, the control unit 70 corrects the scanning position each time the moving image front image is updated. That is, the control unit 70 starts tracking control. When the scanning position is set, the control unit 70 corrects the scanning position using the front image stored in the memory 72 and the scanning position information.

  The correction of the scanning position will be described. First, the control unit 70 compares the front image used for nipple detection stored in the memory 72 with the current front image. The control unit 70 detects (calculates) a position shift direction and a position shift amount of the current front image with respect to the front image used for nipple detection by image processing.

  The control unit 70 uses the front image data used for nipple detection as a reference image, and calculates a positional deviation between the reference image and the front image acquired in real time. Thereby, the positional shift information with respect to the front image used for nipple detection is obtained.

  As described above, when the positional deviation is detected, the control unit 70 appropriately controls the two galvanometer mirrors of the optical scanner 108 so that the positional deviation of the scanning position with respect to the nipple is corrected. Thereby, the scanning position is corrected.

  Thus, by correcting the scanning position using the relative positional deviation between the front image in which the position of the characteristic part (for example, the nipple) is detected in advance by image processing and the front image acquired later, Since it is not necessary to detect a characteristic portion every time an image is acquired, the scanning position can be corrected quickly.

  Further, it is possible to reduce the possibility of misdetection of misalignment due to erroneous detection of characteristic portions. For this reason, it is possible to correct the scanning position with high accuracy. Further, even when the fundus image moves greatly and a part of the characteristic portion cannot be detected, the correction of the scanning position can be made with high probability.

  When the examiner wants to correct the scanning position with respect to the characteristic part, as described above, the control unit 70 switches the moving image of the front image on the monitor 75 to a still image according to the operation signal from the examiner. The scanning position for the characteristic part on the still image may be set (see <Setting of scanning position in still image>, <Acquisition of tomographic image>, <Tracking control>). The tracking control based on the setting of the scanning position and the tracking control based on the detection of the characteristic part can be used in combination. For example, when it is confirmed from the observation image that a deviation has occurred in the detection result of the characteristic part, the examiner switches the front image to a still image and corrects the scanning position with respect to the characteristic part. Thereafter, tracking control is performed using the corrected scanning position and still image.

  In this modification example, as described above, it is also possible to change the shooting conditions during tracking control.

<Position detection method>
Note that various image processing methods (a method using various correlation functions, a method using Fourier transform, and a method based on feature point matching) can be used as a method for detecting a positional deviation between two images. is there.

  For example, when a predetermined reference image (for example, a past front image) or a target image (current front image) is displaced by one pixel, the reference image and the target image are compared, and the two data are most consistent (correlation is It is conceivable to detect a positional deviation between the two data (when it is the highest). Further, a method of extracting a common feature point from a predetermined reference image and target image and detecting a positional shift of the extracted feature point is conceivable.

  Further, a phase-only correlation function may be used as a function for obtaining a positional deviation between two images. In this case, first, each image is Fourier transformed to obtain the phase and amplitude of each frequency component. The obtained amplitude component is normalized to a magnitude of 1 for each frequency component. Next, after calculating the phase difference for each frequency between the two images, inverse Fourier transform is applied to them.

  Here, if there is no position shift between the two images, only the cosine wave is added, and a peak appears at the origin position (0, 0). Further, when there is a positional deviation, a peak appears at a position corresponding to the positional deviation. Therefore, a position shift between two images can be obtained by obtaining a peak detection position. According to this method, the positional deviation of the front image can be detected with high accuracy and in a short time.

It is a schematic block diagram explaining the structure of the ophthalmologic imaging apparatus which concerns on a present Example. It is a figure which shows an example of the display screen displayed on a monitor. It is a figure explaining the setting of a scanning position. 3 shows a flowchart of scan line setting operations. It is a figure explaining the display before and behind correction | amendment of the scanning position on a front image. It is a figure explaining change of scan length and a scan angle. It is a figure explaining the change of a scanning pattern.

70 Control Unit 72 Memory 74 Operation Unit 74a Mouse 74b, 74c Operation Knob 75 Monitor 100 Interference Optical System 108 Optical Scanner 200 Observation Optical System 300 Fixation Target Projection Unit

Claims (10)

An imaging optical system for obtaining a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source on the eye to be examined;
An observation optical system having a light receiving element that receives reflected light from the eye to be examined, and obtaining a moving image of a front image of the eye based on a light reception signal from the light receiving element;
The front image acquired by the observation optical system is displayed on a monitor in a moving state, while the front image is displayed on a monitor in a stationary state, and the acquisition position of the tomographic image is displayed in a stationary state. Display control means that can be set on the front image;
Drive control means for controlling the scanning means so that a tomographic image at an acquisition position set on the still image in the stationary state is acquired;
An ophthalmologic photographing apparatus comprising:   The display control means switches the front image displayed on the monitor in a moving state to a stationary state based on an operation signal input from the operation input means, and based on an operation signal input from the operation input means. The ophthalmic imaging apparatus according to claim 1, wherein the tomographic image acquisition position can be set on a front image displayed in a stationary state.   3. The display control unit according to claim 1, wherein when the setting on the front image displayed in the stationary state is completed, the display control unit switches the front image displayed on the monitor in the stationary state to a live moving image. Any ophthalmic imaging device.   The drive control unit controls the drive of the scanning unit based on a live moving image acquired by the observation optical system, and is acquired on the eye to be examined set on the front image displayed in the stationary state. The ophthalmologic photographing apparatus according to claim 1, wherein the measuring light is tracked at a distance.   The drive control means detects a positional shift between a live moving image acquired by the observation optical system and the front image used for setting an acquisition position in a stationary state by image processing, and based on a detection result, The ophthalmologic photographing apparatus according to claim 1, wherein driving of the scanning unit is controlled to correct a scanning position.   The display control means superimposes and displays an index indicating the acquisition position of the tomographic image on the front image displayed in a stationary state, and displays the index on the front image based on an operation signal input from the operation input means. The ophthalmic imaging apparatus according to claim 1, wherein the index is moved to set a scanning position of the measurement light.   The ophthalmic imaging apparatus according to claim 1, wherein when the scanning position is corrected by the drive control unit, the display control unit changes the display position of the index to a position corresponding to the corrected scanning position.   The observation optical system includes a light receiving element that irradiates infrared light to the eye and receives reflected light from the eye, and obtains a front image of the eye based on a light reception signal from the light receiving element. The ophthalmologic photographing apparatus according to any one of 1 to 7.   The display control means captures the front image acquired by the observation optical system as a still image, displays the still image on the monitor as a still front image, and displays the acquisition position of the tomographic image on the still image. The ophthalmologic photographing apparatus according to any one of claims 1 to 8, wherein the ophthalmic photographing apparatus can be set by the above.   The display control means detects a positional shift between the live moving image acquired by the observation optical system and the reference image, and corrects the display position of the live moving image on the monitor based on the detection result. The ophthalmologic photographing apparatus according to claim 1, wherein the live moving image is displayed on a monitor as a stationary front image.

Images