JP6160809B2 - Ophthalmic photographing apparatus and photographing control program - Google Patents

Description

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

  An optical coherence tomography (OCT) that uses low-coherent light as an ophthalmologic imaging apparatus that can non-invasively capture a tomographic image at a predetermined site (eg, fundus, anterior eye portion) of an eye to be examined. Is known (see, for example, Patent Document 1). In this ophthalmologic photographing apparatus, the photographing position of a tomographic image may be set based on an instruction input by an examiner. For example, the examiner inputs an instruction to specify a tomographic image capturing position (that is, a transverse position for scanning measurement light) while observing a moving image captured from the front of the subject's eye on a monitor. To do. The ophthalmologic imaging apparatus scans the measurement light at the transverse position designated by the examiner, and generates a tomographic image based on the reflected light of the measurement light.

JP 2008-29467 A

  By the way, the conventional apparatus is configured to move a preset scanning pattern on the front image. However, since the imaging position set by the scan pattern is restricted by the shape of the preset scan pattern, there are cases where a tomographic image at a position desired by the examiner cannot be obtained.

  In view of the above problems, an object of the present invention is to provide an ophthalmic imaging apparatus and an imaging control program that can suitably acquire a tomographic image at a site desired by an examiner.

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

(1)
An OCT optical system for generating a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source in the transverse direction on the eye to be examined;
An observation optical system for generating a front image of the eye to be examined;
First display control means for displaying the front image on a display means;
Instruction receiving means for receiving input of instructions from the examiner;
Second display control means for displaying a scanning pattern for setting a scanning position by the scanning means at an arbitrary position on the front image in accordance with an instruction received by the instruction receiving means;
Scanning control means for controlling the driving of the scanning means and scanning the measurement light at a scanning position corresponding to the scanning pattern on the front image;
Pattern deformation means for deforming the scan pattern based on position information of the scan pattern, wherein the scan pattern is arranged in a movable region of a preset scan pattern which is a central region on the front image; The preset scanning pattern is maintained, and when the scanning pattern is arranged in a peripheral area on the front image and in a peripheral area outside the movable area, the preset scanning pattern is set. Pattern deformation means for deforming the scanning pattern,
The scanning control unit is an ophthalmologic photographing apparatus capable of controlling the driving of the scanning unit and acquiring the tomographic image with a deformed scanning pattern.
(2)
An OCT optical system for generating a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source in the transverse direction on the eye to be examined;
An observation optical system for generating a front image of the eye to be examined;
First display control means for displaying the front image on a display means;
Instruction receiving means for receiving input of instructions from the examiner;
Second display control means for displaying a scanning pattern for setting a scanning position by the scanning means at an arbitrary position on the front image in accordance with an instruction received by the instruction receiving means;
Scanning control means for controlling the driving of the scanning means and scanning the measurement light at a scanning position corresponding to the scanning pattern on the front image;
Pattern deformation means for deforming the scan pattern according to the position of the scan pattern on the front image,
An ophthalmologic imaging apparatus capable of acquiring the tomographic image with a deformed scan pattern, comprising a control means for storing a scan position corresponding to the deformed scan pattern in a nonvolatile memory,
The ophthalmic imaging apparatus, wherein the scanning control means scans the measurement light at the scanning position stored in the nonvolatile memory.

An OCT optical system for generating a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source in the transverse direction on the object;
An observation optical system for generating a front image of the eye to be examined;
An imaging control program for controlling the operation of the ophthalmologic imaging apparatus for acquiring the tomographic image,
By being executed by a processor of a control device that controls the ophthalmic imaging apparatus,
A first display control step for displaying the front image on a display means;
An instruction receiving step for receiving an instruction input from the examiner;
A second display control step of displaying a scanning pattern for setting a scanning position by the scanning unit at an arbitrary position on the front image in accordance with the instruction received by the instruction receiving step;
A scanning control step of controlling the driving of the scanning means and scanning the measuring light at a scanning position corresponding to the scanning pattern on the front image;
Pattern deformation means for deforming the scan pattern based on position information of the scan pattern, wherein the scan pattern is arranged in a movable region of a preset scan pattern which is a central region on the front image; The preset scanning pattern is maintained, and when the scanning pattern is arranged in a peripheral area on the front image and in a peripheral area outside the movable area, the preset scanning pattern is set. A pattern deformation step for deforming the scanning pattern;
An acquisition step of controlling the driving of the scanning means and acquiring the tomographic image in a deformed scanning pattern;
An imaging control program for causing the ophthalmologic imaging apparatus to execute.

  A tomographic image at a site desired by the examiner can be suitably acquired.

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 display part. It is a flowchart which shows the example at the time of deform | transforming a scanning pattern. It is a figure for demonstrating an example of a deformation | transformation control of a scanning pattern, and shows the scanning pattern before deformation | transformation. It is a figure for demonstrating an example of a deformation | transformation control of a scanning pattern, and shows after a scanning pattern deformation | transformation. It is a figure which shows an example of the display screen after a scanning pattern was deform | transformed. It is a figure which shows an example when not scanning by the optical scanner about the part beyond the reference | standard area | region A in a scanning pattern. It is a figure which shows an example in the case of displaying on the display part 75 only the part from which the tomographic image was acquired. It is a figure which shows an example in the case of displaying the part from which a tomographic image is not acquired as a blank part. It is a figure which shows an example in the case of narrowing the scanning width of the scanning pattern 25. FIG. It is a figure which shows an example in the case of imaging | photography by cross-shaped scanning, and map imaging | photography together. It is a figure which shows an example at the time of using an X-shaped scan. It is a figure which shows an example at the time of using the multiple scan of the same direction.

  Embodiments of the present invention will be described with reference to the drawings. FIGS. 1-12 is a figure which concerns on the Example of this embodiment.

<Overview>
The ophthalmologic imaging apparatus 10 scans the measurement light (also referred to as sample light) from the OCT optical system 100 in the transverse direction on the eye to be examined with a preset scanning pattern. This apparatus acquires a tomographic image regarding the crossing position of the measurement light. The apparatus deforms the scan pattern according to the position of the scan pattern.

<Overall configuration>
This apparatus mainly includes an OCT optical system 100, an observation optical system 200, and a control unit 70 (see FIG. 1). The OCT optical system 100 includes an optical scanner 108 and is used to generate a tomographic image of the eye to be examined. The optical scanner 108 is used as a scanning unit for scanning the measurement light emitted from the measurement light source in the transverse direction on the test object. The observation optical system 200 is used to generate a front image of the eye to be examined.

  The control unit 70 is used as, for example, an instruction receiving unit that receives an instruction from the examiner. Therefore, the control unit 70 may accept an operation signal from a user interface (operation input unit) such as a touch panel, a mouse, or a keyboard.

  The control unit 70 is used as a display control unit, for example. Therefore, the control unit 70 may display the front image generated by the observation optical system 200 on the display unit 75 (see FIG. 2). Further, the control unit 70 may display a scanning pattern for setting the scanning position at an arbitrary position on the front image according to the instruction signal received by the instruction receiving unit. The instruction receiving unit receives an instruction from the examiner for displaying the scanning pattern at an arbitrary position on the front image.

  In this case, the control unit 70 may superimpose and display the scanning pattern on the front image. The control unit 70 may move the position of the scanning line on the front image according to the instruction signal from the examiner. The instruction receiving unit receives an instruction from the examiner for moving the position of the scanning line displayed on the display unit.

  The control unit 70 is used as a scanning control unit, for example. Therefore, the control unit 70 may control the driving of the optical scanner 108 to scan the measurement light at the scanning position corresponding to the scanning pattern on the front image.

  Specifically, the control unit 70 sets the scanning position according to the position of each scanning line that forms the scanning pattern. Then, the control unit 70 controls the driving of the optical scanner 108 to scan the measurement light at the scanning position set as described above. In this case, the control unit 70 functions as a setting unit that sets the scanning position of the measurement light according to the position of the scanning line.

  For example, the control unit 70 is used as a pattern deforming unit that deforms the scanning pattern in accordance with the position of the scanning pattern on the front image (see FIGS. 3 to 7 and FIGS. 10 to 12). Thereby, a tomographic image corresponding to the deformed scanning pattern can be acquired. Therefore, for example, the scanning position can be set without being restricted by the movement limit defined by the shooting angle of view.

  In addition, when changing according to the position of the scanning pattern, the control unit 70 may directly set the position of the scanning pattern on the front image from the display position of the scanning pattern. The control unit 70 may obtain indirectly from the scanning position of the measurement light set via the scanning pattern. When obtaining indirectly, for example, the drive position of the optical scanner 108 is used.

<Deformed scan pattern>
As the deformed scan pattern, for example, a cross-shaped pattern in which a plurality of scan lines intersect with each other is used. This apparatus can acquire a tomographic image relating to each scanning line. For example, the present apparatus can acquire tomographic images in different scanning directions for a certain intersection using the main scanning pattern. Therefore, compared with a tomographic image on a single scanning line, a tomographic image of the test object can be observed from a plurality of directions.

  Specifically, a cross pattern in which a plurality of scanning lines are orthogonal to each other in vertical and horizontal directions (FIG. 2), an X-shaped pattern in which a plurality of scanning lines intersect in an X shape (FIG. 12), a radial pattern in which a plurality of scanning lines are arranged radially. Or at least one of them is used. The scanning pattern is a pattern in which one or a plurality of first scanning lines parallel to the first direction and a plurality of second lines parallel to a second direction different from the first direction intersect each other. Also good.

  The scanning pattern is not limited to the above, and may be a circle pattern. The scanning pattern may be a combination of a plurality of scanning patterns having different shapes. For example, the scanning pattern may be a combined scan of a map scan for rasterizing measurement light in a rectangle and the above scan.

  Further, for example, as long as the scanning pattern has scanning lines in the vertical and horizontal directions, the technique of this embodiment can be applied.

  As the scanning pattern, for example, even the scanning pattern having a plurality of scanning lines in the same direction is applicable to the technique of the present embodiment (see FIG. 13).

<Deformation of scanning position and scanning pattern (see FIGS. 4 and 5)>
For example, the control unit 70 may deform the scanning pattern according to the position of the scanning pattern so that the scanning center (for example, the intersection K) of the scanning pattern can move to the peripheral part of the front image. Thereby, for example, a tomographic image relating to the target site displayed in the peripheral portion of the front image can be easily acquired. Note that the peripheral portion of the front image is defined as a peripheral region outside the movable region of the scan pattern that is initially set on the front image, for example.

  In this case, when the scanning center is arranged in the central region on the front image based on the position information of the scanning pattern on the front image, the control unit 70 sets the shape of the scanning pattern to be set in advance. When the scanning center is arranged in the peripheral area, the scanning pattern may be modified.

  As another method, the control unit 70 may set a reference region for determining whether or not to deform the scanning pattern. In this case, when the scanning position is set so that a part of the scanning pattern exceeds the reference area A, the control unit 70 may deform the scanning pattern so that the scanning pattern is within the reference area. When the scanning position exceeds the reference area A, for example, when one of the end portions of the scanning pattern reaches the reference area A and the scanning pattern is further moved in the arrival direction, or is set in advance A case where a part of the scanned pattern exceeds the reference position may be considered (details will be described later).

  Note that the end of the scan pattern is, for example, a scan end of a scan line constituting the scan pattern, and is a start point or an end point.

  The scanning pattern deformation control based on the scanning position of the scanning pattern as described above is operated, for example, when the examiner changes the scanning position of the measurement light on the front image. Thereby, the examiner can set the scanning position with the deformed scanning pattern.

  Note that the control unit 70 may be configured to select at least one of the above-described deformation control of each scanning pattern.

<Setting of reference area (see FIGS. 4 and 5)>
The reference area A described above corresponds to, for example, the shootable range (shooting angle of view) of the observation optical system 200 or the displayable range of the front image on the display unit 75. Thereby, the tomographic image regarding the peripheral part of a front image can be acquired suitably. In this case, as a criterion for determining whether or not to deform the scanning pattern, for example, the control unit 70 determines that one of the end portions of the scanning pattern reaches the limit of the above-described photographing range or displayable range. It may be determined whether or not it has been done.

  The reference area A is not limited to this. For example, the imageable range (imaging field angle) of the OCT optical system 100 may be used. Alternatively, a predetermined range smaller than the imageable range of the OCT optical system 100 or the observation optical system 200 may be set as the reference region A.

  Note that a mode that deforms the scanning pattern may also be provided inside the reference region A. For example, the scanning pattern may be deformed according to the distance from the center position of the front image.

  Note that the method is not limited to the method of using the position of the end portion of the scanning pattern, and the position of the scanning pattern may be used. For example, the control unit 70 may determine whether or not to deform the scanning pattern using the intersection position in the cross-shaped pattern. In this case, a reference area corresponding to the intersection position is set.

<Deformation method of scanning pattern (for example, cross pattern) having a plurality of scanning lines (see FIGS. 6, 7, 10, and 12)>
When the scanning pattern is deformed according to the position of the scanning pattern, the control unit 70 prohibits the movement of the scanning line whose scanning position exceeds the reference area A, and changes another scanning line to the line where the movement is prohibited. You may make it move.

  Here, the control unit 70 can acquire, for example, a tomographic image in each direction in the initial imaging range by maintaining the scanning width (that is, the length in the scanning direction) of each scanning line.

  More specifically, when the scanning position is set such that a preset scanning pattern is arranged in the reference area A, the control unit 70 includes a first distance from the start point to the intersection point in each scanning line, The ratio of the second distance from the end point to the intersection point in each scanning line may be maintained.

  When the scanning position is set so that a part of the preset scanning pattern exceeds the reference area A, the control unit 70 sets the first distance from the starting point to the intersection K on each scanning line, and each scanning line. The ratio of the second distance from the intersection K to the end point may be changed. Therefore, the control unit 70 changes the position of the intersection K on the scanning pattern in the direction in which a part of the scanning pattern exceeds the reference region while maintaining the scanning width of each scanning line. Thereby, the intersection K is in a state of being arranged in the peripheral portion of the front image.

  Further, when the scanning pattern is deformed according to the position of the scanning pattern, the control unit 70 maintains the angular relationship between the scanning lines, and the second direction (with respect to the first scanning line related to the first direction ( You may make it move the 2nd scanning line regarding (the 1st direction is crossed). Thereby, it is possible to easily obtain a plurality of tomographic images related to the target region in a state where the angular relationship is maintained.

  Note that the deformation of the cross-shaped pattern is not limited to the change of the position of the intersection K. For example, the control unit 70 may not scan the portion of the scanning pattern 25 that exceeds the reference region A by the optical scanner 108 (see FIG. 7). The control unit 70 may narrow the scanning width of the scanning pattern 25.

  When a cross pattern is used, the control unit 70 initially sets a scan pattern in which the scanning width of each line centering on the intersection is symmetrical in the horizontal and vertical directions. You may make it eccentric.

  Note that the control unit 70 may be configured to select at least one of the above-described deformation control of each cross-shaped pattern.

  Note that when a scanning pattern having a plurality of scanning lines is deformed, the control unit 70 may maintain at least one of a scanning angle and a scanning interval.

  Conversely, when deforming a scan pattern having a plurality of scan lines, the control unit 70 may change at least one of the scan width, the scan angle, and the scan interval.

<Deformation of scanning pattern by instructions from examiner>
In addition, when changing a scanning pattern as mentioned above, it is not limited to the structure deform | transformed according to a scanning position, For example, you may make it deform | transform based on the signal from an examiner. In this case, the control unit 70 can deform the scanning pattern regardless of the scanning position.

<Tracking (see Fig. 1)>
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 the measurement light with the deformed scanning pattern at the set transverse position on the eye to be examined. May be tracked. Therefore, 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 so that the scanning position of the measurement light scanned with the deformed scanning pattern is corrected. May be.

  For example, the control unit 70 maintains the shape of the scanning pattern 25 before the tracking operation regardless of the positional relationship between the scanning position of the scanning pattern 25 and the reference region A. Thereby, a tomographic image can be acquired with the scanning pattern 25 deformed before the tracking operation. Moreover, it is advantageous when acquiring an addition average image based on a plurality of tomographic images acquired at the same scanning position.

  When performing tracking, for example, the control unit 70 detects a positional shift between a live moving image acquired by the observation optical system 200 and a previously acquired still image by image processing, and based on the detection result, the optical scanner 108 Control the drive.

<Follow-up>
In addition, in order to obtain a tomographic image at the same position again on different days such as follow-up observation, the control unit 70 stores the scanning position corresponding to the deformed scanning pattern (deformed scanning pattern) in the nonvolatile memory 72. Also good. In the case of the next shooting, the control unit 70 sets the scanning position at the scanning position of the deformed scanning pattern stored in the nonvolatile memory 72 and scans the measurement light. For example, in the case of follow-up, the control unit 70 may maintain the shape of the previous deformation scanning pattern 25 even if the scanning position is changed.

<Memory for each scan line>
When the set scanning pattern is a scanning pattern formed from a plurality of scanning lines, the control unit 70 divides each tomographic image acquired by the modified scanning pattern according to the scanning lines into a nonvolatile manner. You may make it memorize | store in the memory 72. FIG. Thereby, the tomographic image acquired in the first scanning line and the front image with the line display corresponding to the first scanning line can be confirmed on the analysis software. Separately from this, the tomographic image acquired by the second scanning line and the front image with the line display corresponding to the second scanning line can be confirmed on the analysis software. That is, each tomographic image is stored separately according to the scanning line so that it can be displayed separately on the analysis software.

<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.

  A schematic configuration of an ophthalmologic photographing apparatus 10 according to the present embodiment will be described with reference to FIG. The ophthalmologic imaging apparatus 10 of the present embodiment mainly includes an OCT optical system 100, an observation optical system 200, a fixation target projection unit 300, and a control unit 70.

<OCT optical system>
The OCT optical system 100 is an optical interference optical system for acquiring a tomographic image of a tissue (eg, fundus oculi Ef) of the eye E, and includes an optical tomography (OCT: Optical Coherence Tomography). Specifically, the OCT optical system 100 mainly includes a measurement light source 102, a coupler (light splitter) 104, a measurement optical system 106, a reference optical system 110, and a detector (light receiving element) 120.

  More specifically, the coupler (light splitter) 104 divides the light emitted from the measurement light source 102 into an optical path of the measurement optical system 106 and an optical path of the reference optical system 110. The measurement optical system 106 guides measurement light to the fundus oculi Ef of the eye E. The reference optical system 110 generates reference light. The OCT optical system 100 synthesizes the measurement light reflected by the fundus oculi Ef and the reference light. The detector 120 (light receiving element) receives the combined light.

  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.

  The detector 120 (light receiving element) 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. Various types of OCT can be employed for the ophthalmologic imaging apparatus 10. For example, any one of Spectral-domain OCT (SD-OCT), Swept-source OCT (SS-OCT), Time-domain OCT (TD-OCT), and the like may be employed in the ophthalmic imaging apparatus 10.

  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. As described above, the reference light is combined with the reflected light acquired by the reflection of the measurement light on 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 includes a CPU (processor), a RAM, a ROM, and the like. The CPU of the control unit 70 controls the ophthalmologic photographing apparatus 10. The RAM temporarily stores various information. Various programs for controlling the operation of the ophthalmologic photographing apparatus 10, initial values, and the like are stored in the ROM of the control unit 70.

  A non-volatile memory (hereinafter abbreviated as “memory”) 72, an operation unit 74, a display unit 75, and the like are electrically connected to the control unit 70. The memory 72 is a non-transitory storage medium that can retain stored contents even when power supply is interrupted. For example, a hard disk drive, a flash ROM, and a USB memory that is detachably attached to the ophthalmologic photographing apparatus 10 can be used as the memory 72. The memory 72 stores an imaging control program for controlling imaging of front images and tomographic images by the ophthalmologic imaging apparatus 10. Also, the memory 72 stores various types of information relating to imaging, such as information on the imaging position of the captured two-dimensional tomographic image, three-dimensional image, front image, and tomographic image. Various operation instructions by the examiner are input to the operation unit 74.

  The operation unit 74 outputs a signal corresponding to the input operation instruction to the control unit 70. For the operation unit 74, for example, at least one of a mouse, a joystick, a keyboard, a touch panel, and the like may be used. The display unit 75 may be a display mounted on the main body of the ophthalmologic photographing apparatus 10 or a display connected to the main body. A display of a personal computer (hereinafter referred to as “PC”) may be used. A plurality of displays may be used in combination. Various images including a tomographic image and a front image captured by the ophthalmologic photographing apparatus 10 are displayed on the display unit 75.

  The control unit 70 may be configured by a plurality of control units (that is, a plurality of processors). For example, the control unit 70 of the ophthalmologic imaging apparatus 10 may be configured by a setting control unit provided in the PC and an operation control unit that controls operations of the OCT optical system 100 and the like. In this case, for example, the setting control unit of the PC may set the imaging position of the tomographic image based on the operation of the operation unit connected to the PC, and indicate the set content to the operation control unit. The operation control unit may control the imaging operation by each component of the ophthalmologic imaging apparatus 10 in accordance with an instruction from the setting control unit. Further, the process of generating (acquiring) an image based on the received light signal may be performed by either the operation control unit or the setting control unit.

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

  For example, the control unit 70 controls the display screen of the display unit 75. The acquired fundus image is output to the display unit 75 as a still image or a moving image and is stored in the memory 72. The control unit 70 controls each member of the OCT optical system 100, the observation optical system 200, and the fixation target projection unit 300 based on the operation signal output from the operation unit 74.

<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. An anterior ocular segment observation image taken by an anterior ocular segment observation camera (not shown) is displayed on the display unit 75. Therefore, the examiner performs an alignment operation so that the measurement optical axis is positioned at the center of the pupil of the anterior eye part.

  The control unit 70 controls the driving of the optical scanner 108 and scans the measurement light on the fundus in a predetermined direction. The controller 70 forms a tomographic image by acquiring a light reception signal corresponding to a predetermined scanning region from the output signal output from the detector 120. 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 display unit 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 display unit 75. The scanning pattern 25 is an index representing the measurement position (acquisition position) of the tomographic image on the front image 20. The scanning pattern 25 is electrically displayed on the front image on the display unit 75.

  The control unit 70 displays the pointer 21 (for example, a cross mark, a dot mark, a pen mark, etc.) on the display unit 75. The control unit 70 moves the pointer 21 based on the operation signal from the operation unit 74.

  In the present embodiment, a configuration is possible in which shooting conditions can be set by operating the operation unit 74 (for example, a drag operation or a click operation) with the pointer 21 placed on the front image 20. The pointer 21 is used for designating an arbitrary position on the display unit 75.

<Scanline settings>
Hereinafter, a case where a cross pattern is set as a scanning pattern will be described as an example. The scanning pattern 25 is set in advance to an arbitrary shape based on the examiner's operation. For example, a plurality of scanning patterns are selected.

  When the tomographic image and the front image are displayed on the same screen, the examiner sets the position of the tomographic image to be photographed from the front image on the display unit 75. Here, the examiner moves the scanning pattern 25 with respect to the front image by performing a moving operation (for example, a drag operation) using the operation unit 74.

  When the scan pattern 25 is moved relative to the front image 20 by the examiner, the control unit 70 sets the scan position as needed. Then, the control unit 70 acquires a tomographic image at the scanning position corresponding to the set position. Then, the acquired tomographic image is displayed on the display screen of the display unit 75 as needed. Further, the control unit 70 changes the scanning position of the measurement light based on the operation signal output from the operation unit 74, and displays the scanning pattern 25 at the display position corresponding to the changed scanning position. In this manner, the control unit 70 updates the moving image of the tomographic image by continuously executing the setting of the scanning position and the acquisition of the tomographic image at a certain frame rate.

In the initial stage, the scanning pattern 25 is formed of cross scanning lines (cross scans) that are symmetrical with respect to the left and right and up and down about the intersection Cr.
<Change of scanning pattern shape according to scanning position>
FIG. 2 is a diagram showing a display screen before adjusting the scanning position. For example, the scanning position is set to the center position of the front image as an initial setting. The control unit 70 may change the rotation angle of the scanning pattern and the scanning width (scanning length) based on a predetermined operation signal from the operation unit 74.

  The control unit 70 deforms the scanning pattern according to the position of the scanning pattern on the front image. FIG. 3 is a flowchart showing an example of changing the scanning pattern. For example, the control unit 70 calculates the coordinates of each scanning line after the scanning pattern 25 is moved. Here, the control unit 70 uses the center position of the movement destination, the rotation angle, and the scan width. The offset amount from the intersection center is set to zero.

  Next, the control unit 70 determines whether or not the scanning line protrudes from the front image display screen. When it determines with Yes, the offset amount from the intersection center (intersection K) is calculated. In other words, the control unit 70 calculates from the amount of protrusion and the rotation angle so that the protruding scanning line fits within the display screen of the front image.

  Next, the control unit 70 recalculates the coordinates of each scanning line after movement. That is, the control unit 70 uses the position of the intersection center after movement, the offset amount from the initial intersection center, the rotation angle, and the scan width. Thereafter, after updating the center position and the coordinates of the scanning line, the control unit 70 performs scanning control of measurement light using the optical scanner 108 and drawing operation of a tomographic image.

  If it is determined No, the scanning center position and the scanning line coordinates are updated using the determined scanning line coordinates, and then the measurement light scanning control using the optical scanner 108 and the tomographic image drawing are performed. Operation.

  4 and 5 are diagrams for explaining an example of scanning pattern deformation control. FIG. 4 shows the state before the scanning pattern is deformed, and FIG. 5 shows the state after the scanning pattern is deformed. A reference area A is set on the front image. With respect to the reference area A, this embodiment corresponds to the shootable range (shooting angle of view) of the observation optical system 200. That is, on the display unit 75, it corresponds to the display area of the front image. The reference area A is set, for example, in the up / down / left / right directions. However, the present invention is not limited to this, and it may be set in at least one direction.

  The control unit 70 may deform the scanning pattern based on the positional relationship between the scanning pattern and the reference area A. The control unit 70 may set the reference area A as a boundary as to whether or not to change the scanning pattern. In this case, the reference area A is not limited to a rectangular shape, and may be an area that defines whether or not to deform the scanning pattern. For example, it may be a circle or an ellipse. In addition, the control unit 70 may change the shape of the reference area A according to the set scanning pattern.

  More specifically, the control unit 70 determines whether or not the scanning pattern has reached the reference area A. As shown in FIG. 4, when the end point of the scanning pattern 25 does not reach the reference area A, that is, when the entire scanning pattern 25 is located inside the reference area A, the control unit 70 displays the scanning pattern 25. The shape is not changed (see FIG. 2).

  The control unit 70 can move the intersection K of the scanning pattern 25 on the front image in the initial shape within the center area B (dotted line area) narrower than the reference area A. For example, the center area B is narrower than the reference area A in each direction by the distance from the intersection K to the end point of the scanning pattern 25. That is, the intersection K of the scanning pattern 25 set to the initial shape can move in the central region B. The control unit 70 can acquire a plurality of tomographic images centered on a target site on the fundus in the central region B.

  For example, when the target site for which a tomographic image is desired to be acquired is in the central region of the front image, the examiner moves the scanning pattern 25 toward the target site by operating the operation unit 74. When the intersection K between the vertical line 25a and the horizontal line 25b in the scanning pattern 25 reaches the target site, the control unit 70 can acquire a plurality of tomographic images centered on the target site with the preset scanning pattern 25. Become.

  On the other hand, when the scanning pattern 25 is further moved in the arrival direction after the end point of the scanning pattern 25 reaches the reference area A, the control unit 70 changes the shape of the scanning pattern 25 (see FIGS. 5 and 6). . FIG. 6A to FIG. 6C are diagrams illustrating an example of the display screen after the scanning pattern is deformed.

  The control unit 70 can move the scanning pattern 25 whose shape has been changed in the peripheral region C from the central region B to the reference region A on the front image. That is, the intersection K of the deformed scanning pattern 25 can move in the peripheral area C from the central area B to the reference area A. The control unit 70 can acquire a plurality of tomographic images centered on a target site on the fundus in the peripheral region. Thereby, the movement range of the scanning center of the scanning pattern is expanded with respect to the scanning pattern composed of a plurality of scanning lines in different directions. Thereby, a plurality of tomographic images related to the target site can be easily acquired.

  Hereinafter, control when changing the shape of the scanning pattern 25 will be described in more detail. For example, when there is a target part in the peripheral region C, the examiner moves the scanning pattern 25 toward the target part on the front image by operating the operation unit 74.

  For example, when the upper end point of the vertical line 25a reaches the reference area A and the scanning pattern 25 is further moved upward, the control unit 70 prohibits the movement of the vertical line 25a and sets the horizontal line 25b. Move upward (FIG. 6A). That is, the control unit 70 moves the horizontal line 25b with respect to the vertical line 25a in a state where the movement is fixed. In this case, the movement of the horizontal line 25 b in the vertical direction may be performed by moving the horizontal line 25 b based on the operation signal from the operation unit 74 regardless of whether the horizontal line 25 b has reached the reference area A or not.

  As a result, the position of the intersection K in the scanning pattern 25 moves upward, so that the shape of the scanning pattern is deformed with respect to the initial shape. As a result, the intersection point K can be arranged in the upper area of the peripheral area C, so that a tomographic image related to the target region of the fundus displayed in the upper area can be easily acquired. Furthermore, since the scanning width of the vertical line 25a is maintained even if the shape of the scanning pattern is changed, a vertical tomographic image relating to the target region can be acquired in the initial imaging range.

  In the case of an operation after the vertical line 25a of the scanning pattern 25 has reached the reference area A, the control unit 70 prohibits the movement of the vertical line 25a and moves the horizontal line 25b downward. Good.

  When the scanning pattern 25 is further moved leftward after the left end point of the horizontal line 25b reaches the reference area A, the control unit 70 prohibits the movement of the horizontal line 25b and sets the vertical line 25a. Move to the left (FIG. 6B). That is, the control unit 70 moves the vertical line 25a with respect to the horizontal line 25b in a state where the movement is fixed. In this case, the movement of the vertical line 25a in the horizontal direction may be performed by moving the vertical line 25b based on the operation signal from the operation unit 74 regardless of whether the vertical line 25a has reached the reference area A or not.

  As a result, the position of the intersection K in the scanning pattern 25 moves in the horizontal direction, so that the shape of the scanning pattern is deformed with respect to the initial shape. Thereby, since the intersection K can be arranged in the left area of the peripheral area C, a tomographic image related to the target region of the fundus displayed in the left area can be easily acquired. Furthermore, since the scanning width of the horizontal line 25b is maintained even if the shape of the scanning pattern is changed, a horizontal tomographic image relating to the target region can be acquired in the initial imaging range.

  In the case of the operation after the horizontal line 25b of the scanning pattern 25 has reached the reference area A, the control unit 70, conversely, prohibits the movement of the horizontal line 25b and moves the horizontal line 25b to the right. That's fine.

  For example, when the target site is in the upper left part in the peripheral area C, the examiner moves the scanning pattern 25 toward the upper left area of the front image by operating the operation unit 74. Using the above control method, the control unit 70 further moves the scanning pattern 25 in the arrival direction after at least one of the upper end point of the vertical line 25a and the left end point of the horizontal line 25b reaches the reference region A. In this case, the control unit 70 may deform the scanning pattern 25 (FIG. 6C). As a result, the intersection point K can be arranged in the upper left area of the peripheral region C, so that a tomographic image related to the target region of the fundus displayed in the upper left area can be easily acquired. Furthermore, since the scanning width of the vertical line 25a and the horizontal line 25b is maintained even if the shape of the scanning pattern is changed, a tomographic image in each direction related to the target region can be acquired in the initial imaging range. In addition, description is abbreviate | omitted about the control method in case the target site | part exists in the other area of the peripheral region C.

  The setting of the scanning position on the front image may be set on the moving image of the front image, or may be set on the still image of the front image (for details, see Japanese Patent Application No. 2012-047176).

  The reference area A is not limited to the above. For example, the imageable range (imaging field angle) of the OCT optical system 100 may be used. Alternatively, a predetermined range smaller than the imageable range of the OCT optical system 100 or the observation optical system 200 may be set as the reference region A.

  In addition, when setting a scanning position on a front image, it is not limited to the continuous movement of the scanning pattern 25. FIG. For example, the control unit 70 may jump the scanning center (intersection K) of the scanning pattern 25 to a position designated on the front image by a click operation. Here, when the end point of the scanning pattern in the preset shape exceeds the reference region A, the control unit 70 extends the excess scanning range with respect to the opposite end point side for the scanning line exceeding the reference region A. You may make it make it. Thereby, the same effect as the deformation of the operation pattern in the drag movement of the scanning pattern 25 is obtained.

  The first mode in which the scanning pattern is deformed based on the scanning position and the second mode in which the scanning pattern is not deformed based on the scanning position may be switched. The control unit 70 switches control according to switching between the first mode and the second mode.

<Acquisition of tomographic images>
As described above, after the scanning position is set for the target region on the front image, the control unit 70 obtains a tomographic image corresponding to the scanning position set on the front image 20. Based on the display position of the scanning pattern 25, the control unit 70 scans the measurement light on the fundus so that a tomographic image of the fundus corresponding to the position of the scanning pattern 25 is obtained.

  Since the relationship between the display position of the scan pattern 25 (coordinate position on the monitor) and the scan position of the measurement light by the optical scanner 108 is determined in advance, the control unit 70 sets the display position of the scan pattern 25 to the set position. The driving of the optical scanner 108 is controlled so that the measurement light is scanned with respect to the corresponding scanning range.

  When the scanning pattern 25 is deformed as described above, the control unit 70 obtains a tomographic image using the deformed scanning pattern 25. On the other hand, when the scanning pattern 25 is not deformed, the control unit 70 obtains a tomographic image with the scanning pattern 25 set in advance.

  The control unit 70 acquires a first tomographic image corresponding to the vertical line 25a and a second tomographic image corresponding to the horizontal line 25b with respect to the target region on the fundus. The control unit 70 displays the first tomographic image and the second tomographic image on the display unit 75. Accordingly, tomographic images in different directions with respect to the target region are displayed on the display unit 75, respectively. That is, when the scanning pattern 25 has a plurality of scanning lines, the control unit 70 may simultaneously display the tomographic images related to the scanning lines.

<Tracking control>
When continuously acquiring tomographic images after setting the scanning position, the control unit 70 corrects the scanning position every time the front image of the moving 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 still image of the front image stored in the memory 72 and the scanning position information. In addition, as a still image of the front image, for example, the front image when the setting of the scanning position is completed is used. Of course, the present invention is not limited to this, and a still image used for setting the scanning position may be used.

  For example, the control unit 70 compares the still image of the front image with the current front image, and detects (calculates) the direction and amount of positional deviation of the current front image with respect to the still image of the front image by image processing. To do. For example, the control unit 70 uses the still image data of the front image stored in the memory 72 as a reference image, and calculates the direction and amount of positional deviation 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. Further, when the scanning position is corrected, the control unit 70 displays the corrected scanning position (scanning pattern 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. Further, the still image of the acquired tomographic image is displayed on the display unit 75. Further, the control unit 70 may capture (capture) a still image of the front image and store it in the memory 72.

  Note that the control unit 70 may store the first tomographic image and front image corresponding to the vertical line 25a separately from the second tomographic image and front image corresponding to the horizontal line 25b.

  During the tracking control operation as described above, the control unit 70 maintains the shape of the scanning pattern 25 before the tracking operation regardless of the positional relationship between the scanning position of the scanning pattern 25 and the reference region A. That is, by tracking the eye, after the end point of the scanning pattern 25 reaches the reference area A, the control unit 70 deforms the scanning pattern 25 even when the scanning pattern 25 is further moved in the arrival direction. do not do. Of course, when the scanning pattern is deformed before the tracking operation, the control unit 70 operates the tracking with the deformed scanning pattern before the tracking operation. However, there can be control for rotating the scanning pattern in accordance with eye rotation. Then, the control unit 70 rotates the scanning pattern while maintaining the shape.

<Transformation example>
In the above control, the control unit 70 may shift the position of the intersection center (for example, the intersection point K) of the scan pattern based on the operation signal from the operation unit 74. That is, conventionally, the cross scan is only a pattern that is symmetrical in the vertical and horizontal directions with respect to the intersection K. That is, the control unit 70 makes the intersection position of each scanning line in the cross-shaped scan decenterable (can be changed) from the intermediate position between the start point and the end point, so that the tomographic image of the target region (particularly, the peripheral region on the front image) ) Can be obtained easily.

  In the above description, regarding the deformation of the scan pattern, the control is performed to shift the position of the intersection center (for example, the intersection point K) of the scan pattern according to the scanning position, but the present invention is not limited to this. For example, the control unit 70 may not scan the portion exceeding the reference region A in the scanning pattern 25 by the optical scanner 108 (see FIG. 7). That is, the control unit 70 may limit the scanning area by the optical scanner 108 to a portion corresponding to the inside of the reference area A in the scanning pattern 25. In this case, when displaying a tomographic image on the display part 75, it becomes smaller than the preset scanning width. Therefore, the control unit 70 may display only the portion where the tomographic image has been acquired on the display unit 75 (see FIG. 8), or display the portion where the tomographic image is not acquired as a blank portion. You may make it (refer FIG. 9). That is, the control unit 70 may perform image processing for applying a mask for removing unnecessary portions.

  Further, regarding the deformation of the scan pattern, the control unit 70 reduces the scan width of the scan pattern 25 when the scan pattern 25 is further moved in the arrival direction after the end point of the scan pattern 25 reaches the reference region A. Alternatively, see FIG. According to this, the center of the imaging region can be moved to the center of the acquired OCT image. In this case, the control unit 70 may reduce only one direction, or may reduce both vertical and horizontal directions.

  In the radial scan, when the end point of the scanning pattern 25 reaches the reference area A, the scanning width from the intersection is shortened for the scanning line reaching the reference area A, and the scanning width from the intersection is set for the other scanning lines. You may make it maintain. Thereby, the center ratio is maintained.

  The scan pattern may be modified by performing any one of the above modifications. In addition, according to the configuration in which one deformation method can be selected from a plurality of deformation methods, the deformation method can be selected according to the imaging purpose, so that options for obtaining a tomographic image are widened.

  In the above-described configuration, the control unit 70 may use both the above-described cross-scan shooting and map shooting (for example, raster scan) in combination. For example, the control unit 70 may execute a raster scan on a rectangle so as to include a vertical and horizontal scanning range by cross-shaped scanning (see hatching in FIG. 11). The control unit 70 may continuously perform the shooting by the cross scan and the map shooting based on one shooting trigger.

  When an X-shaped scan is used as the scanning pattern, the control unit 70 may change the intersection angle of each line without moving the intersection center of each scanning line (see FIG. 12). Thereby, a vertically or horizontally symmetrical image can be taken.

  When a scanning pattern having a plurality of scanning lines in the same direction is used as the scanning pattern, the control unit 70 may slide at least one scanning line in the scanning direction with respect to the other scanning lines. Good (see FIG. 13). Such a method is advantageous when the scan line is set in an oblique direction (for example, the scan line can be set at a corner of the screen).

  When obtaining the scanning position information of the scanning pattern, the control unit 70 obtains the scanning position information by detecting the scanning position of the optical scanner 108 in addition to acquiring the coordinate position of the scanning pattern on the front image. Also good. This is because the scanning pattern display position on the front image and the optical scanner 108 are usually set in a pair.

DESCRIPTION OF SYMBOLS 20 Front image 25 Scan pattern 30 Tomographic image 70 Control part 72 Memory 74 Operation part 75 Display part 100 OCT optical system 108 Optical scanner 200 Observation optical system

Claims (4)

An OCT optical system for generating a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source in the transverse direction on the eye to be examined;
An observation optical system for generating a front image of the eye to be examined;
First display control means for displaying the front image on a display means;
Instruction receiving means for receiving input of instructions from the examiner;
Second display control means for displaying a scanning pattern for setting a scanning position by the scanning means at an arbitrary position on the front image in accordance with an instruction received by the instruction receiving means;
Scanning control means for controlling the driving of the scanning means and scanning the measurement light at a scanning position corresponding to the scanning pattern on the front image;
Pattern deformation means for deforming the scan pattern based on position information of the scan pattern, wherein the scan pattern is arranged in a movable region of a preset scan pattern which is a central region on the front image; The preset scanning pattern is maintained, and when the scanning pattern is arranged in a peripheral area on the front image and in a peripheral area outside the movable area, the preset scanning pattern is set. Pattern deformation means for deforming the scanning pattern,
The scanning control unit is an ophthalmologic photographing apparatus capable of controlling the driving of the scanning unit and acquiring the tomographic image with a deformed scanning pattern. The ophthalmic imaging according to claim 1, wherein the pattern deforming unit sets a reference region for determining whether or not to deform the scan pattern, and deforms the scan pattern based on a positional relationship of the scan pattern with respect to the reference region. apparatus. An OCT optical system for generating a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source in the transverse direction on the eye to be examined;
An observation optical system for generating a front image of the eye to be examined;
First display control means for displaying the front image on a display means;
Instruction receiving means for receiving input of instructions from the examiner;
Second display control means for displaying a scanning pattern for setting a scanning position by the scanning means at an arbitrary position on the front image in accordance with an instruction received by the instruction receiving means;
Scanning control means for controlling the driving of the scanning means and scanning the measurement light at a scanning position corresponding to the scanning pattern on the front image;
  Pattern deformation means for deforming the scan pattern according to the position of the scan pattern on the front image,
An ophthalmologic imaging apparatus capable of acquiring the tomographic image with a deformed scan pattern, comprising a control means for storing a scan position corresponding to the deformed scan pattern in a nonvolatile memory,
The ophthalmic imaging apparatus, wherein the scanning control means scans the measurement light at the scanning position stored in the nonvolatile memory. An OCT optical system for generating a tomographic image of the eye to be examined, having scanning means for scanning the measurement light emitted from the light source in the transverse direction on the object;
An observation optical system for generating a front image of the eye to be examined;
An imaging control program for controlling the operation of the ophthalmologic imaging apparatus for acquiring the tomographic image,
By being executed by a processor of a control device that controls the ophthalmic imaging apparatus,
A first display control step for displaying the front image on a display means;
An instruction receiving step for receiving an instruction input from the examiner;
A second display control step of displaying a scanning pattern for setting a scanning position by the scanning unit at an arbitrary position on the front image in accordance with the instruction received by the instruction receiving step;
A scanning control step of controlling the driving of the scanning means and scanning the measuring light at a scanning position corresponding to the scanning pattern on the front image;
Pattern deformation means for deforming the scan pattern based on position information of the scan pattern, wherein the scan pattern is arranged in a movable region of a preset scan pattern which is a central region on the front image; The preset scanning pattern is maintained, and when the scanning pattern is arranged in a peripheral area on the front image and in a peripheral area outside the movable area, the preset scanning pattern is set. A pattern deformation step for deforming the scanning pattern;
An acquisition step of controlling the driving of the scanning means and acquiring the tomographic image in a deformed scanning pattern;
An imaging control program for causing the ophthalmologic imaging apparatus to execute.

Images