WO2016136859A1 - 眼底撮影システム - Google Patents
眼底撮影システム Download PDFInfo
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- WO2016136859A1 WO2016136859A1 PCT/JP2016/055562 JP2016055562W WO2016136859A1 WO 2016136859 A1 WO2016136859 A1 WO 2016136859A1 JP 2016055562 W JP2016055562 W JP 2016055562W WO 2016136859 A1 WO2016136859 A1 WO 2016136859A1
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- optical path
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
- A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
- A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
- A61B3/152—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for aligning
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0016—Operational features thereof
- A61B3/0041—Operational features thereof characterised by display arrangements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/0091—Fixation targets for viewing direction
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/14—Arrangements specially adapted for eye photography
- A61B3/15—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing
- A61B3/156—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for blocking
- A61B3/158—Arrangements specially adapted for eye photography with means for aligning, spacing or blocking spurious reflection ; with means for relaxing for blocking of corneal reflection
Definitions
- the present invention relates to a fundus photographing system configured to photograph a fundus of a subject's eye with a plurality of cameras.
- FIG. 4A is a block diagram illustrating an example of the configuration of a conventional fundus imaging system, in which reference numeral C1 indicates a first camera for performing color imaging, and reference numeral C2 indicates alignment and spontaneous emission during color imaging.
- Reference numeral 30 denotes a second camera for performing fluorescence imaging.
- Reference numeral 30 denotes a dichroic mirror for dividing and guiding light LB from the fundus (not shown) of the eye to be examined to the first camera C1 and the second camera C2. Show. Then, when performing spontaneous fluorescence imaging with the second camera C2, the dichroic mirror 30 is moved out of the optical path (see arrow Q in FIG. 5B), and the light LB is not divided and the second camera is divided. The light was received by C2.
- An object of the present invention is to provide a fundus imaging system that can solve the above-described problems.
- FIG. 1 The invention according to claim 1 is illustrated in FIG. 1, and illumination means (2) for irradiating the fundus of the eye to be examined (E), When arranged in the optical path of the reflected light (LB) irradiated by the illumination means (2) and reflected by the fundus (see reference PB; hereinafter referred to as “reflected optical path”).
- illumination means (2) for irradiating the fundus of the eye to be examined E
- LB reflected light
- Optical path splitting means (30) for splitting the reflected light (LB) into two optical paths (PB1, PB2) (hereinafter referred to as "first optical path” and “second optical path”);
- An optical path correcting means (31) configured to be movable and guiding the reflected light (LB) to the second optical path (PB2) when arranged in the reflected optical path (PB);
- a first camera mounting portion (4) for mounting the first camera (C1) at a position where the reflected light (LB) traveling along the first optical path (PB1) can be received;
- the optical path splitting means (30) and the optical path correcting means (31) are movably supported, and one of the optical path splitting means (30) and the optical path correcting means (31) is selectively placed in the reflected optical path (PB).
- a reflected light path switching means (32) for switching the light path by arranging the other of the light path dividing means (30) and the light path correcting means (31) outside the reflected light path,
- a first filter (F1) that transmits light in a first wavelength range A position (hereinafter referred to as a “first filter insertion position”) in an optical path (see PA, hereinafter referred to as “illumination optical path”) between the illumination means (2) and the fundus oculi and a position outside the illumination optical path
- First filter moving means (G1) for movably supporting the first filter (F1) at a position (hereinafter referred to as "first filter removal position”);
- a position upstream of the position in the reflected light path (PB) where the optical path correcting means (31) is disposed hereinafter referred to as “second filter insertion position”
- Second filter moving means (G2) for movably supporting the second
- the reflected light path switching means (32) is driven to place the light path dividing means (30) in the reflected light path (PB) and the light path correcting means (31). Is arranged outside the reflected light path (hereinafter referred to as “first imaging mode”), and the first filter moving means (G1) is driven to move the first filter (F1) to the first filter.
- Second imaging mode a mode in which the stage (30) is disposed outside the reflected light path and the optical path correction means (31) is disposed in the reflected light path (PB).
- second imaging mode a mode in which the stage (30) is disposed outside the reflected light path and the optical path correction means (31) is disposed in the reflected light path (PB).
- PB reflected light path
- the second camera (C2) is configured to be able to shoot a still image and a moving image.
- moving images can be taken.
- the invention according to claim 3 is the invention according to claim 2, wherein an amplification means (90) for amplifying an image signal output from the image sensor (C2a) in the second camera (C2); When observing the fundus with the second camera (C2) in the first imaging mode, observing the fundus with the second camera (C2) in the second imaging mode, and in the second imaging mode A gain adjusting means (91) for adjusting the gain of the amplifying means (90) when the fundus is photographed by the second camera (C2).
- the invention according to claim 4 is the invention according to claim 1, wherein the first filter (F1) is an exciter filter capable of transmitting light in a wavelength range of 500 nm to 600 nm, and the second filter ( F2) is a barrier filter capable of transmitting light in the wavelength range of 640 nm to 740 nm.
- the invention according to claim 5 is the invention according to claim 4, wherein the optical path dividing means (30) has a light reflectance in a wavelength range of 50 nm to 650 nm of 98% or more and a wavelength range of 800 nm to 950 nm. Is a dichroic mirror with 90% light transmittance,
- the optical path correcting means (31) is a glass having a transmittance of about 98% in a wavelength range of 630 nm to 950 nm.
- the reflected light is divided by the optical path dividing means and received by both the first camera and the second camera.
- the second imaging mode since the reflected light is received by the first camera, autofluorescence imaging can be performed by using appropriate filters as the first filter and the second filter.
- the optical path correcting means is arranged so as to guide the reflected light toward the second camera, so that the optical axis of the second camera and the An appropriate fundus image can be taken without any deviation from the reflected light.
- an image with uniform and appropriate brightness can be obtained in any shooting.
- FIG. 1 is a block diagram showing an example of the configuration of a fundus imaging system according to the present invention.
- FIG. 2 is an optical characteristic diagram showing an example of optical characteristics of the optical path dividing means, the first filter, the second filter, etc., where H1 is the reflectance of the optical path dividing means, H2 is the transmittance of the first filter, and H2 is the first characteristic. The transmittance of two filters is shown.
- FIG. 3A is a front view showing an example of the shape of the perforated mirror
- FIG. 3B is a side view thereof
- FIG. 3C is a front view showing an example of the shape of the ring slit.
- FIG. 4A and 4B are schematic diagrams for explaining the conventional problems
- FIG. 4C is a schematic diagram for explaining the effect of the present invention.
- the fundus imaging system is illustrated by reference numeral 1 in FIG. 1 and includes at least the following. That is, Illumination means 2 that irradiates the fundus of the eye E with illumination light LA When configured in an optical path of reflected light LB (hereinafter referred to as “reflected light path”) PB that is configured to be movable and is irradiated by the illumination means 2 and reflected by the fundus, the reflected light LB is Optical path dividing means 30 for dividing into two optical paths (hereinafter referred to as “first optical path” and “second optical path”) PB1, PB2.
- An optical path correction unit 31 configured to be movable and to guide the reflected light LB to the second optical path PB2 when arranged in the reflected optical path PB.
- a first camera mounting portion 4 for mounting the first camera C1 at a position where the reflected light LB that has traveled along the first optical path PB1 can be received.
- a second camera C2 disposed at a position where the reflected light LB that has traveled along the second optical path PB2 can be received.
- the optical path splitting unit 30 and the optical path correcting unit 31 are movably supported, and one of the optical path splitting unit 30 and the optical path correcting unit 31 is selectively disposed in the reflected optical path PB and the optical path splitting unit 30 And the other of the optical path correcting means 31 is disposed outside the reflected optical path to switch the optical path.
- a first filter F1 that transmits light in the first wavelength range A position in the optical path (hereinafter referred to as “illumination optical path”) PA between the illumination means 2 and the fundus (hereinafter referred to as “first filter insertion position”) and a position outside the illumination optical path (hereinafter referred to as “lighting optical path”).
- First filter moving means G1 for movably supporting the first filter F1 at “first filter removal position” A second filter F2 that transmits light in the second wavelength range A position on the upstream side of the position in the reflected light path PB where the optical path correcting means 31 is disposed (that is, the position in the reflected light path PB between the fundus and the optical path correcting means 31; Second filter moving means G2 for movably supporting the second filter F2 between a "second filter insertion position" and a position outside the reflected light path (hereinafter referred to as a "second filter removal position").
- the first filter moving means G1 is driven to move the first filter F1 to the first filter removal position
- the second filter moving means G2 is driven to remove the second filter F2 from the second filter.
- a mode in which the reflected light path switching means 32 is driven to place the light path dividing means 30 in the reflected light path PB, and the light path correcting means 31 is placed outside the reflected light path (hereinafter, “ First imaging mode ”), the first filter moving means G1 is driven to move the first filter F1 to the first filter insertion position, and the second filter moving means G2 is driven to The second filter F2 is moved to the second filter insertion position, the reflected light path switching means 32 is driven, the light path dividing means 30 is arranged outside the reflected light path, and the light path compensation is performed.
- Shooting mode switching means 5 capable of switching to a mode (hereinafter referred to as “second shooting mode”) in which the positive means 31 is arranged in the reflected light path PB.
- the portion indicated by the symbol D in FIG. 1 (that is, the illumination means 2, the filters F1, F2, the filter moving means G1, G2, the optical path dividing means 30, the optical path correcting means 31, and the The portion including the reflected light path switching means 32 and the like) will be appropriately referred to as “fundus imaging device”.
- the fundus imaging system 1 includes: The fundus photographing apparatus D; A first camera C1 attached to the first camera attachment portion 4 of the fundus imaging apparatus D; It is good to comprise.
- a data storage unit (not shown) composed of an HDD, an SSD, or a recording medium (for example, an SD card, a USB memory, or a compact flash (registered trademark) card) is disposed in the fundus photographing apparatus D
- Images taken by the first camera C1 and the second camera C2 may be stored in the data storage unit.
- a computer PC (specifically, a desktop personal computer, a notebook personal computer, a tablet PC, a smartphone, or the like) can be connected to the fundus photographing apparatus D via the image transfer unit 8 in a wired or wireless manner. Images taken by the first camera C1 and the second camera C2 may be taken into the personal computer PC via the image transfer unit 8.
- a monitor M may be connected to the personal computer PC so that images taken by the cameras C1 and C2 can be displayed on the monitor M.
- a light source 20 for observation composed of a halogen lamp or LED
- a light source 21 for photographing composed of a xenon flash lamp or a high brightness LED, Can be mentioned.
- the diffusion plate 22 On the side irradiated with light from the light sources 20 and 21 (that is, downstream of the illumination light path PA), the diffusion plate 22, the ring slit 60, the first filter F1, the illumination optical systems 61 and 63, and the ring.
- the slit 62 and the perforated mirror 64 are disposed, and the objective lens 65 is preferably disposed at a position facing the eye E to be examined.
- a photographing aperture 66 is disposed in the hole portion of the perforated mirror 64, and a focus lens 70 and a half for adjusting the focus by moving the position on the reflected light path PB on the downstream side of the photographing aperture 66.
- a mirror 71 and an internal fixation lamp 72 may be disposed.
- the optical path dividing means 30 has a dichroic mirror (preferably having a light reflectance in a wavelength range of 450 nm to 650 nm, which is a wavelength range used for color photography, as exemplified by reference numeral H1 in FIG. 98% or more, and having a light transmittance of 90% in the wavelength range of 800 nm to 950 nm, which is the wavelength range used when observing with infrared light before photographing).
- 31 can reduce the amount of reflected light traveling to the first optical path PB1 and increase the amount of reflected light traveling to the second optical path PB2 with respect to a predetermined wavelength range (for example, used for spontaneous fluorescence photography).
- the optical path through which the reflected light LB is guided by the optical path correcting unit 31 is substantially coincident with one of the two optical paths PB1 and PB2 divided by the optical path dividing unit 30.
- various methods are conceivable as a method for achieving such a configuration. That is, The shape (thickness) and refractive index of the optical path splitting means 30 and the optical path correcting means 31 are made substantially equal, and the positions (positions in the reflected light path) and the angles (attitudes) at which the means 30 and 31 are arranged are substantially the same.
- examples of the reflected light path switching means 32 include a drive motor and various actuators.
- examples of the first camera C1 described above include a commercially available camera for color photography (preferably a digital camera capable of color photography), and examples of the second camera C2 include spontaneous fluorescence photography and red photography.
- a black-and-white camera that can be observed and photographed by external light can be given, and it is preferable that the camera be configured to photograph not only still images but also moving images.
- the second camera C2 may be detachably attached to the fundus photographing apparatus D in the same manner as the first camera C1.
- examples of the first filter F1 include an exciter filter in which the first wavelength range is a wavelength range of 500 nm to 600 nm (that is, an exciter filter capable of transmitting light having a wavelength range of 500 nm to 600 nm).
- the second filter F2 transmits a barrier filter whose second wavelength range is a wavelength range of 640 nm to 740 nm (that is, transmits light having a wavelength range of 640 nm to 740 nm). Barrier barrier that can be used) (see symbol H3 in FIG. 2).
- examples of the first filter moving means G1 and the second filter moving means G2 include a drive motor and various actuators.
- the first filter F1 and the second filter F2 are retracted to positions outside the optical path (that is, the first filter removal position and the second filter removal position), and the reflected light LB.
- the reflected light LB enters the second optical path PB2. Therefore, alignment and photographing are performed by the second camera C2.
- the first filter F1 and the second filter F2 are inserted into the optical path at the same time as photographing, that is, when the shutter button is pressed, the filters F1 and F2 are inserted, and then a flash lamp (that is, a light source for photographing). 21) emits light, and an image may be captured by the second camera C2.
- a barrier filter having a second wavelength range of 640 nm to 740 nm is used as the second filter F2
- a transparent glass having a transmittance of about 98% in the wavelength range of 630 nm to 950 nm is used as the optical path correction means 31. Is used, most of the reflected light LB is guided to the second camera C2, and a bright image can be acquired.
- the photographing mode switching means 5 described above is An operation unit 51 operated by an operator; A drive control unit 52 that sends signals from the operation unit 51 to the filter moving units G1, G2 and the optical path switching unit 32 to control their drive; It is good to comprise by.
- a switch, a button, a touch panel, or the like is arranged on the fundus photographing apparatus D side as the operation unit 51 of the photographing mode switching means 5, and a dedicated circuit board is provided on the fundus photographing apparatus D side.
- the drive control unit 52 of the photographing mode switching means 5 is installed in the personal computer PC so that the personal computer PC functions as the drive control unit 52 and is connected to the personal computer PC.
- a keyboard, mouse, or the like may function as the operation unit 51.
- the same applies to other operations that is, various operations necessary for photographing a fundus image
- an operation unit and a control unit necessary for the operation may be provided on the personal computer PC side, or Either may be provided on the fundus photographing apparatus D side.
- the reflected light LB is divided by the optical path dividing means 30 and received by both the first camera C1 and the second camera C2. (Refer to FIG. 4A.) While observing the fundus with the second camera C2, the fundus can be appropriately photographed (preferably color photographing) with the first camera C1. Further, in the second imaging mode, the reflected light LB is received by the first camera C1, so that spontaneous fluorescence imaging can be performed by using appropriate filters as the first filter F1 and the second filter F2. It can be carried out.
- the optical path dividing means 30 is simply moved out of the optical path. As shown in FIG. 4, the optical path of the reflected light LB is deviated from the optical axis R of the second camera C2. However, according to the present invention, the optical path correcting means 31 is arranged so that the reflected light LB is Since it is configured to guide toward the second camera C2, an appropriate fundus image can be taken without causing such a shift.
- the switching of the optical path dividing unit 30 and the optical path correcting unit 31 may be performed simultaneously with the switching of the photographing mode, not simultaneously with the shutter operation.
- the fundus is observed by the second camera C2 in the first shooting mode and the second shooting mode.
- the movie shooting in the second shooting mode Still image shooting by the second camera C2 becomes possible.
- the optical path dividing unit 30 is used in the first imaging mode
- the optical path correcting unit 31 is used in the second imaging mode
- the filter F1 is further used during imaging in the second imaging mode.
- F2 will be used, and the amount of light received by the second camera C2 will be different.
- Amplifying means 90 for amplifying an image signal output from the second camera C2 (more precisely, the image sensor C2a); When observing the fundus with the second camera C2 in the first imaging mode, observing the fundus with the second camera C2 in the second imaging mode, and the second in the second imaging mode.
- the gain adjusting means 91 is As shown in FIG. 1, it may be provided in the main body (that is, inside the fundus photographing apparatus D), -It may be provided so as to be connected to the outside of the main body (that is, outside the fundus photographing apparatus D), A dedicated application software may be installed in the personal computer PC so that the personal computer PC functions as the amplification unit 90 and the gain adjustment unit 91.
- edge part is not a perfect circle but a zigzag line and lacks appearance. Therefore, an electronic mask is automatically applied to the still image captured by the second camera C2, so that the range of the captured image is narrower than the observation range and the flare is removed.
- a diaphragm is integrated with the second filter F2.
- the light amount adjustment (aperture diameter change) of photographing light (reflected light) can be simultaneously performed in the second photographing mode (autofluorescence photographing).
- This size of the ring slit 62 takes into consideration the inclination angle of the perforated mirror 64, and is an optimal size that does not include extra flare.
- it is often designed to be slightly larger than this size in consideration of the balance of various elements.
- First camera mounting portion 5
- Shooting mode switching means 30
- Optical path dividing means 31
- Optical path correcting means 32
- Amplifying means 91
- Gain adjusting means C1 First camera C2 Second camera
- First filter F2 Second filter G1 First Filter moving means
- G2 Second filter moving means LB Reflected light PA Illumination optical path PB Reflected optical path PB1 First optical path PB2 Second optical path
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Abstract
Description
移動可能に構成されると共に前記照明手段(2)により照射されて前記眼底により反射される反射光(LB)の光路(符号PB参照。以下、“反射光路”とする)中に配置された場合に前記反射光(LB)を2つの光路(PB1,PB2)(以下、“第1光路”及び“第2光路”とする)に分割する光路分割手段(30)と、
移動可能に構成されると共に前記反射光路(PB)中に配置された場合に前記反射光(LB)を前記第2光路(PB2)に導く光路補正手段(31)と、
前記第1光路(PB1)を進んできた反射光(LB)を受光できる位置に第1カメラ(C1)を取り付ける第1カメラ取付部(4)と、
前記第2光路(PB2)を進んできた反射光(LB)を受光できる位置に配置される第2カメラ(C2)と、
前記光路分割手段(30)及び前記光路補正手段(31)を移動可能に支持して該光路分割手段(30)及び該光路補正手段(31)の一方を選択的に前記反射光路(PB)中に配置すると共に該光路分割手段(30)及び該光路補正手段(31)の他方を前記反射光路外に配置して光路の切り換えを行う反射光路切換手段(32)と、
第1の波長範囲の光を透過する第1フィルタ(F1)と、
前記照明手段(2)と前記眼底との間の光路(符号PA参照。以下、“照明光路”とする)中の位置(以下、“第1フィルタ挿入位置”とする)と該照明光路外の位置(以下、“第1フィルタ抜去位置”とする)とに前記第1フィルタ(F1)を移動可能に支持する第1フィルタ移動手段(G1)と、
第2の波長範囲の光を透過する第2フィルタ(F2)と、
前記光路補正手段(31)が配置される前記反射光路(PB)中の位置よりも上流側の位置(以下、“第2フィルタ挿入位置”とする)と該反射光路外の位置(以下、“第2フィルタ抜去位置”とする)とに前記第2フィルタ(F2)を移動可能に支持する第2フィルタ移動手段(G2)と、
前記第1フィルタ移動手段(G1)を駆動して前記第1フィルタ(F1)を前記第1フィルタ抜去位置に移動させ、前記第2フィルタ移動手段(G2)を駆動して前記第2フィルタ(F2)を前記第2フィルタ抜去位置に移動させ、前記反射光路切換手段(32)を駆動して前記光路分割手段(30)を前記反射光路(PB)中に配置すると共に前記光路補正手段(31)を前記反射光路外に配置してなるモード(以下、“第1撮影モード”とする)と、前記第1フィルタ移動手段(G1)を駆動して前記第1フィルタ(F1)を前記第1フィルタ挿入位置に移動させ、前記第2フィルタ移動手段(G2)を駆動して前記第2フィルタ(F2)を前記第2フィルタ挿入位置に移動させ、前記反射光路切換手段(32)を駆動して前記光路分割手段(30)を前記反射光路外に配置すると共に前記光路補正手段(31)を前記反射光路(PB)中に配置してなるモード(以下、“第2撮影モード”とする)とに切り換え可能な撮影モード切換手段(5)と、を備えたことを特徴とする眼底撮影システム(1)に関する。
前記第1撮像モードにおいて前記第2カメラ(C2)により前記眼底を観察する場合と、前記第2撮像モードにおいて前記第2カメラ(C2)により前記眼底を観察する場合と、前記第2撮像モードにおいて前記第2カメラ(C2)により前記眼底を撮影する場合とで、前記増幅手段(90)のゲインを調整するゲイン調整手段(91)と、を備えたことを特徴とする。
前記光路補正手段(31)は、630nm~950nmの波長範囲での透過率が98%程度のガラスであることを特徴とする。
・ 被検眼Eの眼底に照明光LAを照射する照明手段2
・ 移動可能に構成されると共に前記照明手段2により照射されて前記眼底により反射される反射光LBの光路(以下、“反射光路”とする)PB中に配置された場合に前記反射光LBを2つの光路(以下、“第1光路”及び“第2光路”とする)PB1,PB2に分割する光路分割手段30
・ 移動可能に構成されると共に前記反射光路PB中に配置された場合に前記反射光LBを前記第2光路PB2に導く光路補正手段31
・ 前記第1光路PB1を進んできた反射光LBを受光できる位置に第1カメラC1を取り付ける第1カメラ取付部4
・ 前記第2光路PB2を進んできた反射光LBを受光できる位置に配置される第2カメラC2
・ 前記光路分割手段30及び前記光路補正手段31を移動可能に支持して該光路分割手段30及び該光路補正手段31の一方を選択的に前記反射光路PB中に配置すると共に該光路分割手段30及び該光路補正手段31の他方を前記反射光路外に配置して光路の切り換えを行う反射光路切換手段32
・ 第1の波長範囲の光を透過する第1フィルタF1
・ 前記照明手段2と前記眼底との間の光路(以下、“照明光路”とする)PA中の位置(以下、“第1フィルタ挿入位置”とする)と該照明光路外の位置(以下、“第1フィルタ抜去位置”とする)とに前記第1フィルタF1を移動可能に支持する第1フィルタ移動手段G1
・ 第2の波長範囲の光を透過する第2フィルタF2
・ 前記光路補正手段31が配置される前記反射光路PB中の位置よりも上流側の位置(つまり、前記眼底と前記光路補正手段31との間の反射光路PB中の位置であって、以下、“第2フィルタ挿入位置”とする)と該反射光路外の位置(以下、“第2フィルタ抜去位置”とする)とに前記第2フィルタF2を移動可能に支持する第2フィルタ移動手段G2
・ 前記第1フィルタ移動手段G1を駆動して前記第1フィルタF1を前記第1フィルタ抜去位置に移動させ、前記第2フィルタ移動手段G2を駆動して前記第2フィルタF2を前記第2フィルタ抜去位置に移動させ、前記反射光路切換手段32を駆動して前記光路分割手段30を前記反射光路PB中に配置すると共に前記光路補正手段31を前記反射光路外に配置してなるモード(以下、“第1撮影モード”とする)と、前記第1フィルタ移動手段G1を駆動して前記第1フィルタF1を前記第1フィルタ挿入位置に移動させ、前記第2フィルタ移動手段G2を駆動して前記第2フィルタF2を前記第2フィルタ挿入位置に移動させ、前記反射光路切換手段32を駆動して前記光路分割手段30を前記反射光路外に配置すると共に前記光路補正手段31を前記反射光路PB中に配置してなるモード(以下、“第2撮影モード”とする)とに切り換え可能な撮影モード切換手段5
・ 該眼底撮影装置Dと、
・ 該眼底撮影装置Dの前記第1カメラ取付部4に取り付けられる第1カメラC1と、
により構成すると良い。ここで、HDDやSSDや記録メディア(例えば、SDカードやUSBメモリーやコンパクトフラッシュ(登録商標)カードなど)からなるデータ保存部(不図示)を前記眼底撮影装置Dに配置しておいて、前記第1カメラC1や前記第2カメラC2が撮影した画像は該データ保存部に保存するようにしても良い。また、該眼底撮影装置Dには、画像転送部8を介してパソコンPC(具体的には、デスクトップパソコンやノートパソコンやタブレットPCやスマートフォンなど)を有線又は無線で接続できるようにしておいて、該第1カメラC1や前記第2カメラC2が撮影した画像は該画像転送部8を介して該パソコンPCに取り込めるようにしても良い。さらに、該パソコンPCにはモニターMを接続しておいて、各カメラC1,C2が撮影した画像を該モニターMに表示できるようにしても良い。
・ ハロゲンランプ、またはLED等からなる観察用の光源20や、
・ キセノンフラッシュランプまたは高輝度LED等からなる撮影用の光源21、
を挙げることができる。そして、それらの光源20,21からの光が照射される側(つまり、照明光路PAの下流側)には、拡散板22やリングスリット60や第1フィルタF1や照明光学系61,63やリングスリット62や穴あきミラー64を配置し、被検眼Eに対峙する位置には対物レンズ65を配置すると良い。また、該穴あきミラー64の孔部には撮影絞り66を配置し、該撮影絞り66の下流側には、前記反射光路PB上の位置を移動することによりピントを調整するフォーカスレンズ70やハーフミラー71や内部固視灯72などを配置すると良い。
・ 前記光路分割手段30及び前記光路補正手段31の形状(厚み)や屈折率などを略等しくし、それらの手段30,31を配置する位置(反射光路中の位置)や角度(姿勢)を略等しくして該光路分割手段30を透過した後の光の光路と該光路補正手段31を透過した後の光の光路とが略等しくなるようにする方法
・ 前記光路分割手段30及び前記光路補正手段31の形状及び/又は屈折率は略等しくないが、それらの手段30,31を配置する位置(反射光路中の位置)や角度(姿勢)を適正なものにして該光路分割手段30を透過した後の光の光路と該光路補正手段31を透過した後の光の光路とが略等しくなるようにする方法
・ オペレータが操作する操作部51と、
・ 該操作部51からの信号を前記フィルタ移動手段G1,G2や前記光路切換手段32に送ってそれらの駆動を制御する駆動制御部52と、
によって構成すると良い。なお、図1では、前記眼底撮影装置Dの側にスイッチやボタンやタッチパネル等を配置して前記撮影モード切換手段5の操作部51とし、該眼底撮影装置Dの側に専用の回路基板を設けて該撮影モード切換手段5の駆動制御部52としているが、前記パソコンPCに専用のアプリケーションソフトをインストールしておいて該パソコンPCを前記駆動制御部52として機能させると共に、パソコンPCに接続されたキーボードやマウスなどを前記操作部51として機能させるようにしても良い。その他の操作(つまり、眼底画像を撮影するときに必要な種々の操作)についても同様であって、該操作に必要な操作部や制御部はパソコンPCの側に設けるようにしても、或いは、前記眼底撮影装置Dの側に設けるようにしても、どちらでも良い。
(1) 前記第1撮影モードの観察時における前記第2カメラC2による動画撮影
(2) 前記第2撮影モードの観察時における該第2カメラC2による動画撮影
(3) 該第2撮影モードにおける該第2カメラC2による静止画撮影
が可能となる。しかしながら、前記第1撮影モードでは前記光路分割手段30が使用されているのに対して前記第2撮影モードでは前記光路補正手段31が使用されており、該第2撮影モードの撮影時にはさらにフィルタF1,F2が使用されることとなり、前記第2カメラC2の受光量が異なってしまうこととなる。そこで、
・ 前記第2カメラC2(正確には、その撮像素子C2a)にて出力される画像信号を増幅する増幅手段90と、
・ 前記第1撮像モードにおいて前記第2カメラC2により前記眼底を観察する場合と、前記第2撮像モードにおいて前記第2カメラC2により前記眼底を観察する場合と、前記第2撮像モードにおいて前記第2カメラC2により前記眼底を撮影する場合とで、眼底画像の明るさが略一定となるように前記増幅手段90のゲインを調整するゲイン調整手段91と、
を設けておくと良い。そのようにした場合には、前記(1)~(3)のいずれの撮影をする場合においても、均一かつ適正な明るさの画像を得ることができる。なお、前記第2カメラC2についてのゲインだけではなく、前記第1撮影モードにおける前記第1カメラC1(撮像素子C1a)についてのゲインも調整するようにすると良い。なお、前記ゲイン調整手段91は、
・ 図1に例示するように本体内(つまり、前記眼底撮影装置Dの内部)に設けてもよいし、
・ 本体外部(つまり、前記眼底撮影装置Dの外部)に接続するように設けてもよいし、
・ 前記パソコンPCに専用のアプリケーションソフトをインストールしておいて該パソコンPCを前記増幅手段90や前記ゲイン調整手段91として機能させるようにしても良い。
5 撮影モード切換手段
30 光路分割手段
31 光路補正手段
32 反射光路切換手段
90 増幅手段
91 ゲイン調整手段
C1 第1カメラ
C2 第2カメラ
F1 第1フィルタ
F2 第2フィルタ
G1 第1フィルタ移動手段
G2 第2フィルタ移動手段
LB 反射光
PA 照明光路
PB 反射光路
PB1 第1光路
PB2 第2光路
Claims (5)
- 被検眼の眼底に光を照射する照明手段と、
移動可能に構成されると共に前記照明手段により照射されて前記眼底により反射される反射光の光路(以下、“反射光路”とする)中に配置された場合に前記反射光を2つの光路(以下、“第1光路”及び“第2光路”とする)に分割する光路分割手段と、
移動可能に構成されると共に前記反射光路中に配置された場合に前記反射光を前記第2光路に導く光路補正手段と、
前記第1光路を進んできた反射光を受光できる位置に第1カメラを取り付ける第1カメラ取付部と、
前記第2光路を進んできた反射光を受光できる位置に配置される第2カメラと、
前記光路分割手段及び前記光路補正手段を移動可能に支持して該光路分割手段及び該光路補正手段の一方を選択的に前記反射光路中に配置すると共に該光路分割手段及び該光路補正手段の他方を前記反射光路外に配置して光路の切り換えを行う反射光路切換手段と、
第1の波長範囲の光を透過する第1フィルタと、
前記照明手段と前記眼底との間の光路(以下、“照明光路”とする)中の位置(以下、“第1フィルタ挿入位置”とする)と該照明光路外の位置(以下、“第1フィルタ抜去位置”とする)とに前記第1フィルタを移動可能に支持する第1フィルタ移動手段と、
第2の波長範囲の光を透過する第2フィルタと、
前記光路補正手段が配置される前記反射光路中の位置よりも上流側の位置(以下、“第2フィルタ挿入位置”とする)と該反射光路外の位置(以下、“第2フィルタ抜去位置”とする)とに前記第2フィルタを移動可能に支持する第2フィルタ移動手段と、
前記第1フィルタ移動手段を駆動して前記第1フィルタを前記第1フィルタ抜去位置に移動させ、前記第2フィルタ移動手段を駆動して前記第2フィルタを前記第2フィルタ抜去位置に移動させ、前記反射光路切換手段を駆動して前記光路分割手段を前記反射光路中に配置すると共に前記光路補正手段を前記反射光路外に配置してなるモード(以下、“第1撮影モード”とする)と、前記第1フィルタ移動手段を駆動して前記第1フィルタを前記第1フィルタ挿入位置に移動させ、前記第2フィルタ移動手段を駆動して前記第2フィルタを前記第2フィルタ挿入位置に移動させ、前記反射光路切換手段を駆動して前記光路分割手段を前記反射光路外に配置すると共に前記光路補正手段を前記反射光路中に配置してなるモード(以下、“第2撮影モード”とする)とに切り換え可能な撮影モード切換手段と、
を備えたことを特徴とする眼底撮影システム。 - 前記第2カメラは静止画及び動画を撮影できるように構成され、前記第1撮影モード及び前記第2撮影モードにおいて該第2カメラによって前記眼底を観察する際に動画撮影できる、
ことを特徴とする請求項1に記載の眼底撮影システム。 - 前記第2カメラ中の撮像素子にて出力される画像信号を増幅する増幅手段と、
前記第1撮像モードにおいて前記第2カメラにより前記眼底を観察する場合と、前記第2撮像モードにおいて前記第2カメラにより前記眼底を観察する場合と、前記第2撮像モードにおいて前記第2カメラにより前記眼底を撮影する場合とで、前記増幅手段のゲインを調整するゲイン調整手段と、
を備えたことを特徴とする請求項2に記載の眼底撮影システム。 - 前記第1フィルタは、500nm~600nmの波長範囲の光を透過させることができるエキサイタフィルタであり、前記第2フィルタは、640nm~740nmの波長範囲の光を透過させることができるバリアフィルタである、
ことを特徴とする請求項1に記載の眼底撮影システム。 - 前記光路分割手段は、50nm~650nmの波長範囲での光の反射率が98%以上で、800nm~950nmの波長範囲での光の透過率が90%のダイクロイックミラーであり、
前記光路補正手段は、630nm~950nmの波長範囲での透過率が98%程度のガラスである、
ことを特徴とする請求項4に記載の眼底撮影システム。
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US10285587B2 (en) | 2019-05-14 |
AU2016224513A1 (en) | 2017-09-07 |
JP6573965B2 (ja) | 2019-09-11 |
HK1247068B (zh) | 2020-06-26 |
EP3263017A4 (en) | 2018-10-24 |
EP3263017A1 (en) | 2018-01-03 |
JPWO2016136859A1 (ja) | 2017-12-07 |
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