CN110151122A - A kind of OCT image device spiral scanning method - Google Patents
A kind of OCT image device spiral scanning method Download PDFInfo
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- CN110151122A CN110151122A CN201910386813.1A CN201910386813A CN110151122A CN 110151122 A CN110151122 A CN 110151122A CN 201910386813 A CN201910386813 A CN 201910386813A CN 110151122 A CN110151122 A CN 110151122A
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- galvanometer
- scanning
- oct image
- image device
- scanning method
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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
- A61B3/0016—Operational features thereof
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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
- A61B3/102—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for optical coherence tomography [OCT]
-
- 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
- A61B3/107—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining the shape or measuring the curvature of the cornea
Abstract
The present invention provides a kind of OCT image device spiral scanning method, the OCT image device includes: light source, light source control module, galvanometer and galvanometer control module；Using pupil as scanning center when the vibration mirror scanning, linear velocity constant, correcting action after the end of scan.The present invention directly can carry out similar circular scan to border circular areas by the way of helical scanning, avoid other modes scanning to extraneous region, improve the sweep time of system；The shortcomings that be easy to causeing center sampling excessively to concentrate in circular scan is avoided simultaneously；The spacing for determining helical scan path by designing simultaneously, avoids over-sampling, improves the efficiency and performance of image capturing system.
Description
Technical field
The invention belongs to ophthalmology checking Instrument technical fields, and in particular to a kind of OCT image device spiral scanning method.
Background technique
Means of optical coherence tomography (OCT) has become the important tool of detection ophthalmology disease.And at present absolutely mostly
Several ophthalmic optical coherence dislocation scanning and imaging systems be all the single focus point of surface scan of sample come obtain B- scanning and
3-D image.
The beam scanning method of the disresonance and resonance mirror scanner that are currently commonly used is by fast axle (X-direction)
With the scan method to plane of the line scanning synthesis of slow axis (Y-direction).It is actually required for the region as cornea
The image wanted is border circular areas, and is rectangle with the figure that linear scanning obtains, therefore to spend more unnecessary acquisition time and exist
Other than interested region, and after the control waveform signal for controlling this scanning mode makes the single pass of scanner completion fast axle
Backhaul is needed, this can also occupy the part-time always acquired.
Therefore it needs to existing OCT image device, as the scanning mode of cornea scanner makes improvement.
Summary of the invention
The object of the present invention is to be directed to the deficiency of existing ophthalmology OCT image device scanning mode, a kind of OCT image is provided
Device spiral scanning method.
It is of the invention to provide a kind of OCT image device spiral scanning method in order to reach above-mentioned technical purpose, it is described
OCT image device includes: to include light source, light source control module, galvanometer and galvanometer control module；The light that the light source issues passes through light
After source control module adjusts spot size, it is incident on galvanometer, galvanometer is default in the real-time control lower edge of the galvanometer control module
Scan path movement, the hot spot is constantly reflected into sample surfaces with the movement of galvanometer, forms scanning light spot, and then sample
Imaging；The scan path is equidistant spiral of Archimedes, and using pupil as scanning center when the vibration mirror scanning, linear velocity is permanent
It is fixed, correcting action after the end of scan.
Further, the light source control module is a collimating mirror；Spot size is controlled to adjust by collimating mirror.
Further, the galvanometer is based on galvanometric galvanometer.
Further, the galvanometer includes X galvanometer and Y galvanometer, and the X galvanometer and Y galvanometer all have a torsional axis, and
The torsional axis antarafacial of two galvanometers is mutually orthogonal.
Further, the galvanometer control module includes galvanometer driving plate, single-chip microcontroller/waveform generator, the galvanometer drive
Movable plate is connect with galvanometer, and the single-chip microcontroller/waveform generator is connect with the galvanometer driving plate, and single-chip microcontroller/waveform generator is defeated
Control waveform is to the galvanometer driving plate out, to control the scan path of galvanometer.
Further, the scanning light spot diameter is 15-20 μm.
Further, the galvanometer is scanned the diameter centered on pupil for the region of 10mm.
Further, the screw pitch between the equidistant spiral of Archimedes of the scan path is 0.5mm.
Further, when scanning, one timing of helix linear velocity, angular speed and the relationship of time are Wherein v is linear velocity, and a is constant, and r is distance of the helix initial position apart from rectangular coordinate system origin,
The angle that θ is turned over when being time x=t, when can obtain linear velocity constant, the relationship of angle and time areIt is false
If counterclockwise rotation when being positive and scanning always along rotary scanning counterclockwise, then x=L (θ) cos θ, y=L (θ) sin θ, wherein
L (θ) is angle when being θ, distance of the scanning element apart from helix center, and L and θ are linear relationship.By changing linear velocity v and a
Value it is adjustable control waveform frequency and amplitude variation.
OCT image device spiral scanning method provided by the invention, has the advantages that
(1) similar circular scan directly can be carried out to border circular areas by the way of helical scanning, avoids other modes
It scans to extraneous region, improves the sweep time of system；Avoiding in circular scan simultaneously be easy to cause center to sample
In concentrate the shortcomings that.
(2) spacing that helical scan path is determined by designing, avoids the over-sampling of other scanning modes, improves image and adopts
The efficiency and performance of collecting system.
Scanning system of the invention can be used for OCT cornea scanner.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 a is existing " rice " zigzag scanning path schematic diagram；
Fig. 1 b is existing circular scan path schematic diagram；
The OCT image apparatus structure schematic diagram of the spiral scanning method of Fig. 2 embodiment of the present invention；
Fig. 3 is the OCT image apparatus structure block diagram of the spiral scanning method of the embodiment of the present invention；
Fig. 4 is single-chip microcontroller/waveform generator output drive waveforms schematic diagram of the embodiment of the present invention；
Fig. 5 is the scan path schematic diagram of the spiral scanning method of the embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Existing scanner mostly uses " rice " font flat scanning or circular scan, as shown in Figure 1.
" rice " the font flat scanning it can be seen from Fig. 1 a will lead to serious due to laterally using there are non-uniform
Scanner distortion and lateral over-sampling, especially in the center of scanning, over-sampling most serious.
Even with circular scan shown in Fig. 1 b, although can be to avoid scanning when uninterested region is swept
It retouches, but easily there is a problem in that over-sampling is easy to appear, because generally requiring 1200 or so points forms a width figure, but such as
It is continuous point when because sweeping one " circle " when fruit " circle " is scanned, has internal lesser bowlder, if being also required to sweep 1200
Point then will also result in central part scanning and excessively concentrate, over-sampling occurs.
For this purpose, the present invention provides a kind of OCT image device spiral scanning method, referring to Fig. 2-5, wherein OCT image dress
Setting as shown in Figure 2 includes: to include light source 1, collimating mirror 5, X galvanometer 3, Y galvanometer 2, galvanometer control module 6, wherein X galvanometer 3 and Y vibration
Mirror 2 all has a torsional axis, and the torsional axis antarafacial of two galvanometers is mutually orthogonal；The light that light source 1 issues is adjusted by collimating mirror 5
After whole spot size, it is incident on X galvanometer 3, Y galvanometer 2, galvanometer control module 6 drives X galvanometer 3, Y galvanometer 2 to move, therefore hot spot
Sample surfaces are constantly reflected into the movement of galvanometer, are scanned on a plane of scanning motion 4, sampling imaging；On the plane of scanning motion 4
Scan path as shown in figure 5, being equidistant spiral of Archimedes, using pupil as scanning center when vibration mirror scanning, linear velocity is permanent
It is fixed, correcting action after the end of scan.It uniform sampling achievable in this way and does not waste time with scanning element uninterested
Position, to improve scan efficiency.
The wave function feature of helical scan path are as follows: linear velocity constant is scanned according to constant linear velocity
The distance of angular speed, angular displacement and certain moment scanning element range sweep center recycles polar coordinates and cartesian coordinate to convert
The location information of certain moment hot spot is obtained, which represents the deflection angle of galvanometer, and the deflection angle of galvanometer is corresponding
Vibration mirror control signal voltage value.
When scanning, one timing of helix linear velocity, angular speed and the relationship of time are
Wherein v is linear velocity, and a is constant, and r is distance of the helix initial position apart from rectangular coordinate system origin, when θ is time x=t
The angle turned over, when can obtain linear velocity constant, the relationship of angle and time areAssuming that rotation counterclockwise
Always along rotary scanning counterclockwise when being positive and scanning, then x=L (θ) cos θ, y=L (θ) sin θ, wherein L (θ) be for angle
When θ, distance of the scanning element apart from helix center, L and θ are linear relationship.It is adjustable by the value for changing linear velocity v and a
Control the frequency and amplitude variation of waveform.
When specific operation, as shown in figure 4, galvanometer control module 6 includes galvanometer driving plate 61, single-chip microcontroller/waveform generator
62, galvanometer driving plate 61 is connect with galvanometer 2/3, and single-chip microcontroller/waveform generator 62 is connect with galvanometer driving plate 3, single-chip microcontroller/waveform
62 output driving waveform of generator is to galvanometer 2/3, to control the scan path of galvanometer 2/3, single-chip microcontroller or waveform generator 4 are defeated
Drive waveforms as shown in Figure 5 out, and then guarantee that galvanometer carries out helical scanning.
In preferred embodiment, X galvanometer 3 and Y galvanometer 2 are based on galvanometric galvanometer.
When being scanned using spiral scanning method of the invention to cornea, it is preferable that scanning light spot diameter is 15-20
μm, to guarantee to obtain enough information, preferably, galvanometer is scanned the diameter centered on pupil for the region of 10mm, compared with
Goodly, the screw pitch that can define spiral sweep is 0.5mm, avoids over-sampling；It is to the diameter centered on pupil in this way
When 10mm border circular areas is scanned, if 12000 hot spot sampled points of proposed adoption, can scan 10 circles, once sweeping in this way
After retouching, 10 OCT images about cornea can be obtained, the reconstruct and analysis of image are then utilized, to obtain the landform of cornea
Figure.Repeated sampling is not present when scanning in this way, also avoids oversampled, improves sampling efficiency and quality, so that
The picture quality finally obtained is also improved.
Spiral scanning method provided by the invention:
(1) similar circular scan directly can be carried out to border circular areas by the way of helical scanning, avoids other modes
It scans to extraneous region, improves the sweep time of system；Avoiding in circular scan simultaneously be easy to cause center to sample
In concentrate the shortcomings that.
(2) spacing that helical scan path is determined by designing, avoids the over-sampling of other scanning modes, improves image and adopts
The efficiency and performance of collecting system.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula is changed and is modified.Therefore, the invention is not limited to the specific embodiments disclosed and described above, to of the invention
Some modifications and changes should also be as falling into the scope of the claims of the present invention.In addition, although being used in this specification
Some specific terms, these terms are merely for convenience of description, does not limit the present invention in any way.
Claims (9)
1. a kind of OCT image device spiral scanning method, which is characterized in that the OCT image device includes: to include light source, light source
Control module, galvanometer and galvanometer control module；The light that the light source issues enters after light source control module adjusts spot size
It is mapped to galvanometer, galvanometer moves in the preset path of real-time control lower edge of the galvanometer control module, and the hot spot is with galvanometer
It moves and is constantly reflected into sample surfaces, form scan path, and then sample imaging；The scan path is equidistant Archimedes
Helix, using pupil as scanning center when the vibration mirror scanning, linear velocity constant, correcting action after the end of scan.
2. OCT image device spiral scanning method according to claim 1, which is characterized in that the light source control module
For a collimating mirror.
3. OCT image device spiral scanning method according to claim 1, which is characterized in that the galvanometer is based on inspection
The galvanometer of flowmeter.
4. OCT image device spiral scanning method according to claim 1, which is characterized in that the galvanometer includes X galvanometer
With Y galvanometer, the X galvanometer and Y galvanometer all have a torsional axis, and the torsional axis antarafacial of two galvanometers is mutually orthogonal.
5. OCT image device spiral scanning method according to claim 1, which is characterized in that the galvanometer control module
Including galvanometer driving plate, waveform generator/single-chip microcontroller, the galvanometer driving plate is connect with galvanometer, and the single-chip microcontroller/waveform occurs
Device is connect with the galvanometer driving plate, and single-chip microcontroller/waveform generator output control waveform is to the galvanometer driving plate, to control
The scan path of galvanometer.
6. OCT image device spiral scanning method according to claim 1, which is characterized in that the scanning light spot diameter
It is 15-20 μm.
7. OCT image device spiral scanning method according to claim 6, which is characterized in that the galvanometer is to pupil
Centered on diameter be 10mm region be scanned.
8. OCT image device spiral scanning method according to claim 7, which is characterized in that the scan path etc.
It is 0.5mm away from the screw pitch between spiral of Archimedes.
9. OCT image device spiral scanning method according to claim 1, which is characterized in that when scanning, helix line
One timing of speed, angular speed and the relationship of time areWherein v is linear velocity, and a is constant, and r is
Distance of the helix initial position apart from rectangular coordinate system origin, the angle that θ is turned over when being time x=t, can obtain linear velocity constant
When, the relationship of angle and time areAssuming that always along counterclockwise when rotation is positive and scans counterclockwise
Rotary scanning, then x=L (θ) cos θ, y=L (θ) sin θ, wherein L (θ) is angle when being θ, and scanning element is apart from helix center
Distance, L and θ are linear relationship, and the frequency and amplitude of the adjustable control waveform of the value by changing linear velocity v and a change.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238388A (en) * | 2020-01-08 | 2020-06-05 | 安徽逻根农业科技有限公司 | High-altitude support form monitoring device and method |
| CN113514004A (en) * | 2021-06-29 | 2021-10-19 | 宁波大学 | Equal-interval sampling method for spiral scanning type surface morphology measurement |
| JP7391169B2 (en) | 2021-11-12 | 2023-12-04 | 株式会社トプコン | Apparatus and method for imaging the eye |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159867A (en) * | 1976-09-11 | 1979-07-03 | Battelle-Institute E. V. | Device and method for measuring the curvature of the cornea |
| CN202096197U (en) * | 2011-05-26 | 2012-01-04 | 浙江大学 | Full range frequency-sweeping OCT imaging system based on phase multiplexing |
| US8231668B2 (en) * | 2005-09-30 | 2012-07-31 | Michael Friebe | Stent for introducing into human body cavities, in particular into blood vessels |
| US20150176977A1 (en) * | 2013-12-20 | 2015-06-25 | Lemoptix Sa | Methods and devices for determining position or distance |
| CN106154192A (en) * | 2009-06-19 | 2016-11-23 | 优瑞技术公司(美国) | Obtain and the system and method for reconstruct for performing faultage image |
| CN106455974A (en) * | 2014-06-20 | 2017-02-22 | 拉姆伯斯公司 | Systems and methods for lensed and lensless optical sensing |
| CN108398779A (en) * | 2018-02-12 | 2018-08-14 | 西安知微传感技术有限公司 | A kind of helical scanning laser projection method and system based on galvanometer |
| CN109965839A (en) * | 2019-04-08 | 2019-07-05 | 广东唯仁医疗科技有限公司 | Anterior ocular segment OCT image device |
-
2019
- 2019-05-10 CN CN201910386813.1A patent/CN110151122A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4159867A (en) * | 1976-09-11 | 1979-07-03 | Battelle-Institute E. V. | Device and method for measuring the curvature of the cornea |
| US8231668B2 (en) * | 2005-09-30 | 2012-07-31 | Michael Friebe | Stent for introducing into human body cavities, in particular into blood vessels |
| CN106154192A (en) * | 2009-06-19 | 2016-11-23 | 优瑞技术公司(美国) | Obtain and the system and method for reconstruct for performing faultage image |
| CN202096197U (en) * | 2011-05-26 | 2012-01-04 | 浙江大学 | Full range frequency-sweeping OCT imaging system based on phase multiplexing |
| US20150176977A1 (en) * | 2013-12-20 | 2015-06-25 | Lemoptix Sa | Methods and devices for determining position or distance |
| CN106455974A (en) * | 2014-06-20 | 2017-02-22 | 拉姆伯斯公司 | Systems and methods for lensed and lensless optical sensing |
| CN108398779A (en) * | 2018-02-12 | 2018-08-14 | 西安知微传感技术有限公司 | A kind of helical scanning laser projection method and system based on galvanometer |
| CN109965839A (en) * | 2019-04-08 | 2019-07-05 | 广东唯仁医疗科技有限公司 | Anterior ocular segment OCT image device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238388A (en) * | 2020-01-08 | 2020-06-05 | 安徽逻根农业科技有限公司 | High-altitude support form monitoring device and method |
| CN111238388B (en) * | 2020-01-08 | 2021-11-16 | 安徽逻根农业科技有限公司 | High-altitude support form monitoring device and method |
| CN113514004A (en) * | 2021-06-29 | 2021-10-19 | 宁波大学 | Equal-interval sampling method for spiral scanning type surface morphology measurement |
| JP7391169B2 (en) | 2021-11-12 | 2023-12-04 | 株式会社トプコン | Apparatus and method for imaging the eye |
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Application publication date: 20190823 |