JP2009219644A - Scanning fundus imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a color ocular fundus image efficiently. <P>SOLUTION: The apparatus has three color light sources of red, green, and blue, a light source unit having an infrared light source, a scanning optical system for scanning the measuring light on a fundus of a test eye, a light receiving optical system for receiving the reflective light of the measuring light with a light receiving element, an image acquisition part obtaining fundus images at every frame based on the received signal, a display monitor of the fundus images, a memory memorizing the fundus images at every frame, a trigger input means for starting the acquisition of the fundus image of each color from the three light sources, and a control means for outgoing each color light toward the fundus from the three light sources based on the trigger signal by the trigger input means under the condition where the infrared fundus images are obtained by the light from the infrared light source continuously and displayed on the monitor as moving images, and releasing the control of incoming of the infrared light toward the light receiving element and displaying the moving images of the infrared images after the fundus image of one frame of each color is obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a scanning fundus imaging apparatus that scans a light beam on a fundus of a subject to photograph the fundus of the subject's eye.

  A red (R) laser that emits monochromatic laser light in a scanning fundus photographing apparatus that scans laser light on the fundus of the subject's eye and acquires the fundus image of the eye to be examined by receiving the fundus reflection light by the light receiving element. A light source, a green (G) laser light source, a blue (B) laser light source, and the like are provided, and the laser light source that emits light can be switched according to the purpose of photographing. Since the acquired fundus image is taken with monochromatic light, fundus observation is performed with a monochrome image.

Further, in the scanning fundus photographing apparatus as described above, all the RGB laser light sources described above are turned on, and the fundus reflection light is divided into red, green, and blue wavelengths, and the divided light beams are dedicated light receiving elements. A scanning-type fundus imaging apparatus is disclosed in which a pseudo-color fundus image is displayed as a moving image by causing the color television monitor to output a received light signal from each light receiving element as a video signal.
JP 7-136127 A

  However, in the case of the apparatus of Patent Document 1, fundus observation using a color moving image by an RGB laser light source and fundus observation using a monochrome moving image by monochromatic light (for example, infrared light) are separately performed. Therefore, it takes time for the examiner. In addition, when a color fundus image is obtained as a moving image, the eye fundus is continuously irradiated with visible laser light. As a result, the eye undergoes pupil miosis due to the glare, and measurement light in the iris There is a possibility that unevenness in the amount of light will occur in the fundus image due to the displacement.

  In view of the above problems, it is an object of the present invention to provide a scanning fundus imaging apparatus that can efficiently acquire a color fundus image.

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

(1) A light source unit having three colors of light sources, a red light source, a green light source, and a blue light source, which emits light with high directivity and high luminance, a light source unit having an infrared light source, and measurement light emitted from each light source of the light source unit A scanning optical system that scans the fundus of the eye to be examined; a light receiving optical system that receives the reflected light of the measurement light emitted to the fundus of the eye to be examined by a light receiving element;
An image acquisition unit for acquiring a fundus image for each frame based on a light reception signal output from the light receiving element;
A display monitor for displaying a fundus image acquired by the image acquisition unit;
A memory for storing the fundus image acquired by the image acquisition unit for each frame;
Trigger input means for inputting a trigger signal for starting acquisition of a fundus image of each color by the three color light sources;
In a state where an infrared fundus image continuously obtained by infrared light emitted from the infrared light source is displayed as a moving image on the display monitor, the memory is based on a trigger signal from the trigger input means. The light of each color is emitted from the three color light sources toward the fundus so that at least one fundus image of each color can be individually stored, and the light reception is performed until the fundus image of at least one frame of each color is obtained. After the incidence of infrared light to the element is regulated and the fundus image for at least one frame of each color is obtained, emission from the light source of the three colors is stopped and the infrared light to the light receiving element is stopped. And a control means for performing control for canceling the incidence restriction and displaying the infrared fundus image on the monitor as a moving image.
(2) The control means of (1) continuously emits light of each color from the three color light sources toward the fundus so that the fundus image of each color can be continuously stored in the memory one frame at a time. It is characterized by that.
(3) The control means of (2) further inputs a trigger signal for starting acquisition of fundus images of four colors including the fundus image of each color by the infrared fundus image and the three color light sources. Trigger input means,
In a state where an infrared fundus image continuously obtained by infrared light emitted from the infrared light source is displayed on the display monitor as a moving image, based on a trigger signal from the second trigger input means, The light of each color is emitted from the light source of three colors and the infrared light source toward the fundus so that at least one fundus image of each color can be individually stored in the memory for one frame.
(4) The control means of (3) emits light of each color from the three color light sources toward the fundus by sequentially pulsing the red light source, the green light source, and the blue light source. And

  According to the present invention, a color fundus image can be acquired efficiently.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an optical system of a scanning fundus photographing apparatus according to the present embodiment.

  A light source unit (laser emitting unit) 1 that emits laser light having red, green, blue, and infrared wavelengths includes a first laser light source 1a that emits laser light having a wavelength in the infrared region (wavelength of about 790 nm), and red There are three colors: a red laser light source 20a that emits laser light (with a wavelength of about 660 nm), a green laser light source 20b that emits green (with a wavelength of about 530 nm) laser light, and a blue laser light source 20c that emits blue (with a wavelength of about 490 nm) laser light. Each light source is driven and controlled by the control unit 30 (see FIG. 2).

  Further, the light source unit 1 has a characteristic of transmitting infrared light and reflecting visible light as an optical path combining member for coaxially (combining) light emitted from each light source on the optical axis L1. A dichroic mirror 23 having a characteristic of reflecting red light and transmitting blue light and green light, and a dichroic mirror 21b having a characteristic of reflecting green light and transmitting blue light are disposed. These dichroic mirrors may be half mirrors.

  In the present embodiment, laser light sources (for example, semiconductor laser light sources) are used for the light source 1a and the light sources 20a to 20c. However, any light source that emits light with high directivity and high brightness may be used. A super luminescence diode (SLD) light source may be used.

  2 is a perforated mirror having an opening in the center, and 3 is a lens. Reference numerals 4 and 5 denote mirrors which are movable in the direction of the arrow shown in FIG. 1 and can perform focusing (diopter correction) by changing the optical path length. 6, 8 and 10 are concave mirrors. 7 is a polygon mirror serving as a scanning means for deflecting and scanning the laser beam in the horizontal direction on the fundus of the eye to be examined, and 9 is a scan for deflecting and scanning the laser beam in a direction perpendicular to the scanning direction by the polygon mirror 7. It is a galvanometer mirror as a means. Here, the polygon mirror 7 and the galvanometer mirror 9 are used as a scanning optical system (optical scanner) that scans the measurement light emitted from each light source of the light source unit 1 on the eye fundus. Note that the scanning optical system for scanning the measurement light on the fundus of the eye to be examined is not limited to this, and an acousto-optic light deflection element (AOD), an electro-optic light deflection element (EOD), a Niipou disk scanner, etc. It is possible to use it.

  The laser light emitted from the light source 1a passes through the dichroic mirror 23, passes through the opening of the perforated mirror 2, passes through the lens 3, and then is reflected by the mirror 4, the mirror 5, and the concave mirror 6 to be a polygon mirror. Head to 7. The light beam reflected by the polygon mirror 7 is reflected by the concave mirror 8, the galvano mirror 9, and the concave mirror 10, and then condensed on the fundus of the eye to be examined, and the fundus is two-dimensionally (in the XY axis direction shown in the figure). ) Scan. An infrared light irradiation optical system for irradiating measurement light in the infrared region to the fundus of the eye to be examined is formed by these optical members.

  Further, the light beam (red light) emitted from the light source 20a is reflected by the dichroic mirror 21a, is further reflected by the dichroic mirror 23, and is guided to the optical path of the irradiation optical system. The light beam guided to the optical path of the irradiation optical system is irradiated on the fundus of the eye to be examined through the same path as the infrared laser beam described above. The light beam (green light) emitted from the light source 20b is reflected by the dichroic mirror 21b, then passes through the dichroic mirror 21a, and is guided to the optical path of the irradiation optical system by the dichroic mirror 23. The light beam (blue light) emitted from the light source 20c is transmitted through the dichroic mirror 21b and the dichroic mirror 21a, and is guided to the optical path of the irradiation optical system by the dichroic mirror 23. With such an optical member, a visible light irradiation optical system that irradiates the fundus of the eye to be examined with three colors of measurement light having different wavelengths in the visible range is formed.

  Reference numeral 12 denotes a lens, and reference numeral 13 denotes a pinhole plate having a pinhole on the optical axis. The lens 12 places the observation point (photographing point) of the fundus of the eye to be examined and the pinhole plate 13 at a conjugate position. 14 is a condensing lens, and 15 is a light receiving element having sensitivity in the infrared region and visible region. Note that an APD (avalanche photodiode) is used for the light receiving element 15 of the present embodiment.

  The reflected light of the laser beam scanned on the fundus of the eye to be examined follows the irradiation optical system in the reverse direction, is reflected by the perforated mirror 2, and is bent downward. The pupil position of the eye to be examined and the opening of the perforated mirror 2 are conjugated by the lens 3 and the concave mirrors 6, 8, and 10. The reflected light reflected by the perforated mirror 2 is focused on the pinhole of the pinhole plate 13 through the lens 12. The reflected light focused at the pinhole is received by the light receiving element 15 through the condenser lens 14. A light receiving optical system for receiving the reflected light of the measurement light irradiated on the fundus of the eye to be examined by these optical members is formed.

  FIG. 2 is a block diagram showing a control system of the scanning fundus photographing apparatus according to this embodiment. Reference numeral 30 denotes a control unit that controls the entire apparatus. The control unit 30 includes a light source unit 1 (light source 1a, light sources 20a to 20c), a polygon mirror 7, a galvano mirror 9, a light receiving element 15, driving means 31 for driving the mirrors 4 and 5, a control unit 32, and a light receiving element. 15 is connected to an image acquisition unit (image forming circuit) 33 that acquires a fundus image for each frame based on a light reception signal output from 15, a monitor 34, a memory 35, a photographing switch 36 provided at the top of a joystick not shown. The The image acquisition unit 33 is provided with a frame memory 33a that temporarily stores a fundus image for at least one frame. Here, the control unit 30 has a display control function for displaying the fundus image acquired by the image acquisition unit 33 on the monitor 34. The memory 35 is used as a storage unit for storing various information, and can store, for example, a fundus image acquired by the image acquisition unit 33 for each frame. The control unit 32 includes an input unit 32a for inputting the refractive power of the eye to be corrected for diopter correction, a laser light selection switch 32b for selecting laser light emitted to the fundus of the eye to be examined, and three colors. A selection switch 32c for selecting a color fundus image capturing mode for acquiring fundus images of each color by a light source or a normal image capturing mode for acquiring an infrared fundus image as a still image is provided.

  The operation of the scanning fundus imaging apparatus having the above configuration will be described.

  The examiner measures the refractive power of the eye to be examined in advance with an eye refractive power measuring device or the like, and inputs the obtained refractive power value of the eye to be examined using the refractive power input unit 32 a of the control unit 32. The control unit 30 stores the input refractive power data in the storage unit 35 and drives the mirrors 4 and 5 using the driving unit 31 to perform diopter correction.

  Further, the examiner selects infrared laser light using a laser light selection switch 32b provided in the control unit 32. Here, the control unit 30 turns on the infrared laser light source 1a based on the selection signal, and causes the light source unit 1 to emit infrared laser light to the eye fundus to be examined. In this case, the control unit 30 is set to a continuous oscillation mode in which the infrared light source 1a is continuously oscillated, and an image captured by the infrared laser light source 1 is displayed on the display monitor 34 as a moving image.

  Further, the examiner uses the selection switch 32c provided in the control unit 32 to select the color fundus image shooting mode or the normal shooting mode. In the following description, a case where the color fundus image capturing mode is set will be described. In this case, the normal shooting mode may be set in the initial state by parameter setting, and the mode may be shifted to the color fundus image shooting mode when the selection switch 32c is pressed.

  Next, the examiner moves the apparatus body by operating a joystick (not shown), performs alignment so that the fundus of the eye to be examined is irradiated with laser light and a desired image is displayed on the monitor 34, and then the control is performed. The focus dial provided in the unit 32 is turned to adjust the focus of the fundus image.

  Here, the control unit 30 continuously oscillates the light source 1 a, emits infrared laser light from the light source unit 1, and drives and controls the polygon mirror 7 and the galvanometer mirror 9, thereby performing infrared laser on the fundus of the eye to be examined. The light is scanned two-dimensionally. Then, the image acquisition unit 33 sequentially arranges the received light signals from the light receiving element 15 obtained by the reflected light from the fundus in the scanning range by the polygon mirror 7 and the galvanometer mirror 9 as image data in the frame memory 33a. In this case, an image for one horizontal row is obtained by the rotational movement of one reflecting surface of the polygon mirror 7.

  When the polygon mirror 7 further rotates and the laser beam is reflected by the next reflecting surface, the received light signal of the reflected light of the laser beam within the scanning range on the next reflecting surface is acquired as a signal for a new row of image data. The data is written in the frame memory 33a of the unit 33. By sequentially performing such processing, the image acquisition unit 33 acquires the imaging range of the fundus oculi that has been two-dimensionally scanned as one image (one frame image), and the control unit 30 The fundus image for one frame stored in the memory 33a is displayed on the monitor. Further, when the fundus image for one frame is obtained, the control unit 30 returns the galvanometer mirror 9 to the reflection angle at the start of scanning, and similarly performs drive control so that the laser beam is scanned again from above to below. To do.

  In this way, the image acquisition unit 33 acquires a fundus image at a predetermined frame rate based on the light reception signal output from the light receiving element 15 in a state where the infrared laser light source 1 is continuously oscillating, and 1 frame Every time the fundus image of the minute is acquired, the fundus image stored in the frame memory 33a is updated as needed. Further, the control unit 30 updates the fundus image to be displayed on the display monitor 34 as needed every time one frame of the fundus image is acquired by the image acquisition unit 33. Thereby, on the display monitor 34, the infrared fundus image continuously obtained by the infrared light emitted from the infrared laser light source 1a is displayed on the display monitor 34 as a moving image.

  When the fundus image desired by the examiner is displayed on the display monitor 34 in this way, the examiner observes the moving image of the infrared fundus image displayed on the display monitor 34 and makes a diagnosis on the subject. It becomes possible.

  FIG. 3 is a timing chart illustrating an operation when a color fundus image is captured. When it is desired to capture a color fundus image while the moving image of the infrared fundus image is displayed on the display monitor 34, the examiner adjusts the imaging conditions so that the infrared fundus image on the monitor 34 becomes a desired image. After that, the shooting switch 36 is pressed. Here, when the trigger signal is input from the photographing switch 36 during the continuous oscillation mode, the control unit 30 ends the continuous oscillation of the infrared laser light source 1 based on the trigger signal, and the red laser light source. 20a, the green laser light source 20b, and the blue laser light source 20c are sequentially selected for each frame, and pulse oscillation is performed. Then, the control unit 30 receives the reflected light from the fundus to be examined by the selected laser light source by the light receiving element 15, acquires the fundus image by the image acquisition unit 33 based on the light reception signal from the light receiving element 15, and acquires the image The fundus image for each frame formed by the unit 33 and having a different use wavelength is stored in the storage unit 35. The order in which the red laser light source 20a, the green laser light source 20b, and the blue laser light source 20c are sequentially pulse-oscillated is not particularly limited (for example, the order may be red, blue, and green).

  More specifically, when the photographing switch 36 is pushed by the examiner, the trigger signal Tr is input to the control unit 30. Based on the trigger signal Tr, the control unit 30 turns off the infrared laser light source 1 that has been continuously oscillated in synchronization with the frame rate of the image acquisition unit 33 and turns on the red laser light source 20a. As a result, the red laser light is applied to the fundus of the eye to be examined by the red laser light source 20a, and the fundus reflection light from the red laser light is received on the light receiving element 15. Here, when a laser beam is scanned over the imaging range of the fundus oculi to be examined by laser scanning with the galvanometer mirror 9 and the polygon mirror 7, one frame of red fundus image is stored as a still image in the frame memory 33a of the image acquisition unit 33. Is done. Then, the control unit 30 transfers the red fundus image for one frame stored in the frame memory 33a to the storage unit 35, and sets and stores a flag for identifying the color of the used laser beam.

  When the red fundus image is acquired in this way, the control unit 30 next turns off the red laser light source 20a and turns on the green laser light source 20b in synchronization with the frame rate. Accordingly, the green laser light is irradiated on the fundus of the eye to be examined by the green laser light source 20b, and the fundus reflected light by the green laser light is received on the light receiving element 15. When the green laser light is scanned over the imaging range of the fundus oculi to be examined, one frame of the green fundus image is stored in the frame memory 33a of the image acquisition unit 33 as a still image. Then, the control unit 30 transfers the one-frame green fundus image stored in the frame memory 33a to the storage unit 35, and sets and stores a flag for identifying the color of the used laser beam.

  Further, when the green fundus image is acquired, the control unit 30 next turns off the green laser light source 20b and turns on the blue laser light source 20c in synchronization with the frame rate. Thereby, the blue laser light is irradiated to the fundus of the eye to be examined by the blue laser light source 20c, and the fundus reflection light by the blue laser light is received on the light receiving element 15. Then, when blue laser light is scanned over the imaging range of the fundus oculi to be examined, one frame of the blue fundus image is stored as a still image in the frame memory 33a of the image acquisition unit 33, and the control unit 80 stores in the frame memory 33a. The stored blue fundus image for one frame is transferred to the storage unit 35, and a flag for identifying the color of the used laser light is set and stored.

  As described above, when the wavelength of the laser light applied to the fundus of the eye to be examined is sequentially switched for each frame, the red fundus image and the green laser by the red laser light source 20a are obtained while the fundus image for three frames is obtained. The green fundus image from the light source 20b and the blue fundus image from the blue laser light source 20c are sequentially stored in the storage unit 35.

  As described above, when a still image of the RGB fundus image is acquired, the control unit 30 turns off the blue laser light source 20c, turns on the infrared laser light source 1, resumes continuous oscillation control, and acquires an image. The infrared fundus image is continuously acquired for each frame by the unit 33 to obtain a moving image of the infrared fundus image.

  The RGB fundus images stored in the storage unit 35 as described above are combined (superimposed) by the control unit 30 and image processed into three-color pseudo-color fundus images. Then, the control unit 30 displays the acquired color fundus image on the monitor 34. Note that the present invention is not limited to the above method, and the RGB fundus image stored in the storage unit 35 is transferred to a personal computer, and the RGB processing is performed by an arithmetic processing unit provided in the personal computer using image processing software. By performing image processing on the fundus image, three pseudo-color fundus images may be displayed on the display of a personal computer. Further, when combining RGB fundus images, feature points (for example, fundus blood vessels, nipples, etc.) of each image are extracted by image processing, and correction processing is performed so that the positions of the feature points coincide with each other. The positional deviation between the fundus images may be corrected.

  In this way, a color fundus image can be acquired smoothly during fundus observation with a moving image using infrared laser light. In addition, since visible laser light is temporarily irradiated between fundus observations using infrared laser light, miosis of the eye to be examined can be avoided, and a clear fundus image with little light amount unevenness can be obtained. In this embodiment, the fundus image of each color is stored as a still image, so that a color fundus image with little flicker can be obtained.

  In the above configuration, depending on the timing at which the shooting start signal is input from the shooting switch 36 (timing at which the trigger signal Tr is generated), the three color light sources at the next frame rate (first) at which the trigger signal is input. In some cases, the laser beam may not be emitted from the eye to the fundus. Therefore, in accordance with the timing when the trigger signal is input from the photographing switch 36, the acquisition of the fundus image of each color by the three color light sources is started at the next frame rate (first) when the trigger signal is input, A case may be provided in which acquisition of fundus images of the respective colors by the three color light sources is started at the frame rate (second and subsequent times) after the trigger signal is input.

  More specifically, a time LS (for example, 10 ms) required from when the trigger signal is input from the photographing switch 36 to when the laser light is emitted from the light source 20a is obtained in advance, and the trigger signal from the photographing switch 36 is obtained. When the time from the input to the next frame rate is shorter than the time LS, the light source 20a is turned on in synchronization with the next frame rate at which the trigger signal is input, and the acquisition of the red fundus image is started. Also good. In this case, the red fundus image may be acquired at the next frame rate when the trigger signal is input, and the lighting timing of the light source 20a itself does not necessarily have to be synchronized with the frame rate. Further, the present invention is not limited to the above method, and considering the time Ls, each color by the three color light sources at the frame rate (second or later) after the trigger signal is input, regardless of the trigger signal input timing. The acquisition of the fundus image may be started.

  In the above description, the color fundus image photographing mode has been described. However, when the normal photographing mode is set, when the photographing switch 36 is pressed, the control unit 30 causes the infrared laser light source 1 to continue. The oscillated state is maintained, and the infrared fundus image for one frame stored in the frame memory 33a of the image acquisition unit 33 is transferred to the storage unit 35 and stored therein.

  In the above description, red, green, and blue three-color fundus images are sequentially acquired. However, four-color fundus images having different wavelengths including infrared fundus images may be sequentially acquired. In this case, when the trigger signal (second trigger signal) is input from the photographing switch 36 while the continuous oscillation mode is operating, the mode is switched to the pulse oscillation control, and the red light source 20a, the green light source 20b, and the blue light source 20c are sequentially switched. The RGB fundus images are stored in the memory 35, and infrared fundus images are acquired during the continuous oscillation mode before and after the pulse oscillation control, and stored in the memory 35. In this case, the red light source 20a, the green light source 20b, the blue light source 20c, and the infrared light source 1a may be sequentially pulse-oscillated.

  In the above description, the light to be applied to the fundus of the eye to be examined is selected by switching between continuous oscillation and pulse oscillation of each light source provided in the light source unit 1, but the present invention is not limited to this. That is, based on the input of the trigger signal described above, light of each color is emitted from the three color light sources toward the fundus so that at least one fundus image of each color can be individually acquired, and at least one frame of each color. Any structure that restricts the incidence of infrared light on the light receiving element 15 until a fundus image of a minute is obtained may be used. After the fundus image for at least one frame of each color is obtained, the emission from the three color light sources to the fundus is stopped, the restriction of the incidence of infrared light on the light receiving element 15 is released, and the monitor 34 The infrared fundus image may be displayed as a moving image.

  For example, you may make it select the light irradiated to a to-be-tested eye fundus by control of increase / decrease in the light quantity level emitted from each light source provided in the light source unit 1. FIG. In addition, in a state where laser light is continuously emitted from the laser light source 1a and the laser light sources 20a to 20c, a shutter is installed in front of each light source, and light to be irradiated on the fundus of the eye to be examined is selected by opening and closing the shutter. It may be. As another method, laser light is continuously emitted from the laser light source 1a and the laser light sources 20a to 20c in the optical path of the irradiation optical system (for example, between the dichroic mirror 23 and the perforated mirror 2). ) Or a rotating plate having four filters that selectively transmit red light, green light, blue light, and infrared light in the optical path of the light receiving optical system (for example, between the perforated mirror 2 and the lens 12) (see FIG. 4), and a filter disposed in the irradiation light path or the light receiving light path may be selectively switched by rotating the rotating plate by a predetermined driving mechanism. In FIG. 4, R is a red transmission filter, G is a green transmission filter, B is a blue transmission filter, and IR is an infrared transmission filter.

  In the above description, since the wavelength of the laser light applied to the fundus of the eye to be examined is sequentially switched for each frame, the positional shift between the images due to the fixation eye movement of the eye to be examined and the burden on the eye to be examined are eliminated. Although it can be minimized, the present invention is not limited to this, and it is only necessary to store at least one frame of the fundus image by the light source of each RGB color in the memory 35. For example, it is conceivable to sequentially switch the wavelength of the laser light applied to the fundus of the eye to be examined every two frames. However, it is preferable to suppress the eye load so that the burden on the eye to be examined due to the irradiation of visible light on the eye fundus is not large. Further, if a fundus image of each color can be acquired for each frame, a color image can be constructed. Therefore, the necessity for acquiring a large number of fundus images of each color is not so high.

  In the above description, the operation signal from the imaging switch 36 operated by the examiner is used as a trigger signal for starting acquisition of the fundus image of each color by the three color light sources. Instead of this, a trigger signal may be automatically input. For example, an alignment detection optical system that detects the relative position between the apparatus main body provided with the irradiation optical system and the light receiving optical system as described above and the eye to be examined is provided, and automatically when the alignment detection result is determined to be appropriate. The alignment completion signal input to the trigger signal may be used as a trigger signal.

It is the figure which showed the optical system of the scanning type fundus imaging apparatus of this Embodiment. It is the block diagram which showed the control system of the scanning type fundus imaging apparatus in this embodiment. It is a timing chart explaining operation | movement at the time of imaging | photography of a color fundus image. It is a schematic block diagram explaining the rotating plate which has four filters which selectively permeate | transmit red light, green light, blue light, and infrared light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source unit 1a Infrared laser light source 7 Polygon mirror 9 Galvanometer mirror 15 Light receiving element 20a Red laser light source 20b Green laser light source 20c Blue laser light source 30 Control part 33 Image acquisition part 34 Display monitor 35 Memory 36 Shooting switch

Claims (4)

A light source unit having three directional light sources, a red light source, a green light source, and a blue light source, which emits light with high directivity and high luminance, a light source unit having an infrared light source, and measurement light emitted from each light source of the light source unit A scanning optical system that scans above, and a light receiving optical system that receives reflected light of the measurement light irradiated to the fundus of the eye to be examined by a light receiving element;
An image acquisition unit for acquiring a fundus image for each frame based on a light reception signal output from the light receiving element;
A display monitor for displaying a fundus image acquired by the image acquisition unit;
A memory for storing the fundus image acquired by the image acquisition unit for each frame;
Trigger input means for inputting a trigger signal for starting acquisition of a fundus image of each color by the three color light sources;
In a state where an infrared fundus image continuously obtained by infrared light emitted from the infrared light source is displayed as a moving image on the display monitor, the memory is based on a trigger signal from the trigger input means. The light of each color is emitted from the three color light sources toward the fundus so that at least one fundus image of each color can be individually stored, and the light reception is performed until the fundus image of at least one frame of each color is obtained. After the incidence of infrared light to the element is regulated and the fundus image for at least one frame of each color is obtained, emission from the light source of the three colors is stopped and the infrared light to the light receiving element is stopped. A scanning-type fundus imaging apparatus, comprising: control means for canceling the restriction of incidence of the image and performing control to display an infrared fundus image on the monitor as a moving image. The control means according to claim 1, wherein the light of each color is continuously emitted from the three color light sources toward the fundus so that the fundus image of each color can be continuously stored in the memory one frame at a time. Scanning fundus photographing apparatus. The control means of claim 2 further includes a second trigger input for inputting a trigger signal for starting acquisition of a fundus image of four colors including an infrared fundus image and a fundus image of each color by the three color light sources. With means,
In a state where an infrared fundus image continuously obtained by infrared light emitted from the infrared light source is displayed on the display monitor as a moving image, based on a trigger signal from the second trigger input means, A scanning type fundus photographing apparatus, wherein light of each color is emitted from the light source of three colors and an infrared light source toward the fundus so that at least one fundus image of each color can be individually stored in the memory. The control means according to claim 3, wherein the red light source, the green light source, and the blue light source are sequentially pulsed to emit light of each color from the three color light sources toward the fundus. Type fundus imaging device.

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