CN109549614B

CN109549614B - Endoscope system

Info

Publication number: CN109549614B
Application number: CN201710891131.7A
Authority: CN
Inventors: 郭祖强; 杨炳柯; 李屹
Original assignee: YLX Inc
Current assignee: YLX Inc
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2022-09-20
Anticipated expiration: 2037-09-27
Also published as: WO2019061819A1; CN109549614A

Abstract

The invention provides an endoscope system, which comprises an endoscope insertion part, a light source device and a processor. The endoscope insertion portion is used for being inserted into an organ or tissue to be detected. The light source device comprises a light source emitting exciting light and a wavelength conversion device which generates stimulated light through excitation of the exciting light. The excitation light and the excited light are guided to the organ or tissue to be detected through the endoscope insertion part, and the proportion of the excitation light and the excited light is adjustable according to the organ or tissue to be detected. The processor comprises a shooting element which is a light field camera, the light field camera shoots an observation part of the organ or tissue to be detected illuminated by the light emitted from the light source device and receives different light signals according to time sequence. The invention also provides a light source device which can be used for matching light sources with different primary color light components according to different light absorption rates of the organ or tissue to be detected and can be used for clearly imaging observation parts of the organ or tissue to be detected at different depths.

Description

Endoscope system

Technical Field

The invention relates to the technical field of medical optics, in particular to an endoscope system and a light source device.

Background

In diagnosis of the inside of a specimen, an endoscope system including an endoscope, a light source device, a processor, a display, and the like is generally used to observe surface and intermediate-depth tissues of a living tissue. When an endoscope system observes the inside of a specimen and observes tissues at different depths, it is necessary to illuminate the tissue at the observation depth with light of a specific wavelength band and to clearly image the observed tissue after an imaging unit is accurately focused.

In the conventional Light source device, a xenon lamp, a Light Emitting Diode (LED), a Laser Disc (LD) and Laser powder are usually used as a Light source to generate white Light for illumination. Because the organ or tissue to be detected has different light absorption rates for different wavelengths, the spectral components of the light reflected by the tissue have larger difference with the irradiated light. If white light is used for illumination, the hue of an image obtained when an image signal generated by a Charge Coupled Device (CCD) is used for display by reflected light may be shifted, which is not favorable for a user to observe and judge. In order to solve the above problem, the endoscopic system employs an image processing method to enlarge/reduce the intensity of the optical signal collected by the CCD, thereby obtaining an image suitable for observation. Although this processing method is simple, its accuracy is low due to the influence of noise in the acquired signal. When the intensity of the optical signal is amplified by image processing, the intensity of the noise is also amplified, and when the intensity of the signal is reduced, the optical energy is lost.

When observing tissues at different depths, not only illumination light capable of enhancing imaging but also a photographing section for clearly imaging the observed tissues are required. The image pickup device of the endoscope system generally uses a color or black-and-white CCD, and can record the light intensity and distribution on the image plane. However, the depth of field and the aperture of the camera element have the contradiction of difficult tuning, the aperture needs to be reduced when the large depth of field is obtained, and noise can be generated when the signal to noise ratio is reduced; the large aperture makes the depth of field small, so that the imaging surface needs to be focused accurately during shooting, and the background is blurred. When observing the tissue of different degree of depth, blood vessel, accurate focusing is more difficult, causes erroneous judgement or erroneous judgement easily.

Disclosure of Invention

In view of the above, there is a need for an endoscopic system that clearly images viewing sites at different depths of the organ or tissue to be examined.

The present invention also provides a light source device for improving the utilization rate of a light source, which can match light sources with different primary color light components according to different light absorption rates of organs or tissues to be detected.

The present invention provides an endoscope system including:

an endoscope insertion section for insertion into an organ or tissue to be examined;

a light source device including a light source that emits excitation light, a wavelength conversion device that generates stimulated light by excitation of the excitation light, the excitation light and the stimulated light forming illumination light and being guided to the organ or tissue to be examined through the endoscope insertion portion, the ratio of light of different colors in the illumination light being adjustable according to the organ or tissue to be examined;

the processor comprises a shooting element, the shooting element is a light field camera, the light field camera shoots an observation part of the organ or tissue to be detected illuminated by the illumination light from the light source device, receives different light signals according to time sequence and converts the different light signals into video signals; and

and the display part is used for receiving the video signal transmitted by the processor and displaying the image of the observation part.

In an embodiment, the endoscope system further includes a filtering device for filtering the stimulated light generated by the wavelength conversion device, and the ratio of the different colors of light in the illumination light is realized by adjusting the light intensity of the light source and/or adjusting the wavelength conversion device and/or adjusting the filtering device.

In an embodiment, the light source device further includes a light source control unit, and the light source control unit adjusts the current of the light source at different time intervals within the same pulse interval so as to adjust the light intensity of the light source.

In an embodiment, the wavelength conversion device comprises a plurality of regions carrying or not carrying wavelength converting material or carrying different wavelength converting materials, the wavelength conversion device further comprising an adjusting mechanism adjusting the area fraction of the plurality of regions to adjust the different color light fraction in the illumination light.

In one embodiment, the filtering device includes a plurality of filter regions and an adjusting mechanism, and the adjusting mechanism adjusts the area ratio of the filter regions to adjust the light ratio of different colors in the illumination light.

In an embodiment, the light field camera includes a black-and-white ccd chip, and the black-and-white ccd chip is used for recording the optical signals of the organ or tissue to be examined with different depths of field.

In one embodiment, the processor includes a red image conversion portion, a green image conversion portion and a blue image conversion portion, wherein the red image conversion portion is configured to process a red light signal of each frame of image and convert the corresponding red light signal into a first surface layer, a first middle layer and a first deep layer signal of the organ or tissue to be examined, the green image conversion portion is configured to process a green light signal of each frame of image and convert the corresponding green light signal into a second surface layer, a second middle layer and a second deep layer signal of the organ or tissue to be examined, and the blue image conversion portion is configured to process a blue light signal of each frame of image and convert the corresponding blue light signal into a third surface layer, a third middle layer and a third deep layer signal of the organ or tissue to be examined.

In an embodiment, the processor further comprises an image combining section for combining the first surface signal, the second surface signal and the third surface signal to obtain a surface image signal of the organ or tissue to be examined; combining the first middle layer signal, the second middle layer signal and the third middle layer signal to obtain a middle layer image signal of the organ or tissue to be detected; and combining the first deep signal, the second deep signal and the third deep signal to obtain a deep image signal of the organ or tissue to be detected.

In one embodiment, the display part includes a first display area for displaying a surface image of the organ or tissue to be examined, a second display area for displaying a middle layer image of the organ or tissue to be examined, and a third display area for displaying a deep layer image of the organ or tissue to be examined.

The invention also provides a light source device, which comprises a light source for emitting exciting light and a wavelength conversion device for generating stimulated light through excitation of the exciting light, wherein the exciting light and the stimulated light form illuminating light for emission, and the ratio of light with different colors in the illuminating light can be adjusted.

Compared with the prior art, the endoscope system of the invention is provided with the light source device capable of adjusting the illumination light ratio and the shooting element capable of shooting the observation part of the organ or tissue to be examined illuminated by the light emitted from the light source device. In addition, the endoscope system of the invention adopts the light field camera as the shooting element, which not only can clearly image the observed part of the organ or tissue to be detected, but also can display real color, thereby facilitating the observation and diagnosis of the internal tissue of the detected body by the user. The endoscope system can clearly image tissues at different depths. The invention also provides a light source device which can match light sources with different primary color light components according to different light absorptivity of organs or tissues to be detected so that an imaging part of the endoscope system can clearly image observed tissues.

Drawings

Fig. 1 is a frame diagram of an endoscope system according to a first embodiment of the present invention.

Fig. 2 is a schematic diagram of the angular ratio of the light segments of the colors in the filter.

FIG. 3 is a graph showing absorption coefficients of different wavelengths of illumination light for an organ or tissue to be examined.

FIG. 4 is a schematic diagram showing the spectra of the absorbed light, the illuminating light and the reflected light of different wavelengths in the organ or tissue to be examined.

Fig. 5 is a schematic diagram of a photographing operation of the light field camera.

Fig. 6 is a frame diagram of an endoscope system according to a first embodiment of the present invention.

Fig. 7 is a schematic view of the display portion.

Description of the main elements

The following specific embodiments will further illustrate the invention in conjunction with the above-described figures.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

For purposes of simplicity and clarity, the same reference numbers will be used in different drawings to identify corresponding or similar elements repeatedly, where appropriate. Furthermore, in the description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those skilled in the art that the embodiments described herein may be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the technical features that are being described. The drawings do not necessarily need to be identical in size to the actual objects. The proportions shown in the figures are exaggerated for the sake of better illustrating the details and technical features. The descriptions in this specification should not be considered as limiting the scope of the embodiments described herein.

Referring to FIG. 1, an endoscope system 100 according to a first embodiment of the present invention is shown. The endoscope system 100 includes a light source device 10, an endoscope insertion portion 20, a processor 30, a first control portion 40, and a display portion 50. The light source device 10 is used for generating illumination light and transmitting the illumination light to the endoscope insertion portion 20 to illuminate an organ or tissue to be examined, the photographing device 30 is used for photographing the organ or tissue to be examined and processing the photographed image, the first control portion 40 is used for setting or adjusting different modes of the light source device 10 to illuminate different organs or tissues, and the display portion 50 is used for displaying image information transmitted by the processor 30.

In one embodiment, the light source device 10 is disposed at the distal end of the endoscope insertion portion 20, and the processor 30 is disposed at the rear end of the endoscope insertion portion 20. It is understood that in other embodiments, the light source device 10 and the processor 30 may be disposed on the same side of the endoscope insertion portion 20. The first control unit 40 and the display unit 50 are electrically connected to the processor 30.

The light source device 10 is used to supply illumination light for illuminating the observation site of the organ or tissue to be examined. The light source device 10 includes a light source control unit 11, a light source 12, a wavelength conversion device 13, and a filter device 14. The light source control unit 11 can drive and control the light source 12. The light source 12 can emit excitation light, the wavelength conversion device 13 emits stimulated light by the excitation of the excitation light, and the excitation light and the stimulated light jointly form illumination light for illuminating the organ or tissue to be detected.

Specifically, a plurality of regions may be disposed on the wavelength conversion device 13, and the plurality of regions may or may not carry a wavelength conversion material or carry different wavelength conversion materials, respectively, so that the excitation light emitted from the light source 12 irradiates on the wavelength conversion device 13 to generate the excited light with a specific spectrum. Such as, but not limited to, a phosphor, quantum dots, or dye. The stimulated light may be blue, green, or yellow stimulated light, etc., depending on the material properties of the wavelength conversion material.

Examples of the organ or tissue to be examined include, but are not limited to, ear, nose, throat, rectum, bladder tissue, joint, mucosal tissue, blood vessel, venous blood vessel, arterial blood vessel, etc.

It is understood that the light source control unit 11 can control the start and end of driving, the driving time, the synchronization timing, and the like of each unit of the light source device 10.

The light source 12 is a laser light source, specifically, a blue laser diode. The light source 12 is capable of emitting blue excitation light. In this embodiment, the excitation light is a blue laser having a center wavelength of 445 nanometers (nm). The blue laser light emitted by the light source 12 can be conducted to the wavelength conversion device 13 through an optical fiber. In this embodiment, the wavelength conversion device 13 has yellow phosphor thereon, so that the blue laser emitted from the light source 12 excites the wavelength conversion device 13 to generate yellow excited light, and the blue excited light and the yellow excited light are mixed to generate white light for illumination, and the illumination light is guided to the organ or tissue to be examined through the endoscope insertion portion 20, so that the observer can observe the organ or tissue to be examined.

Referring to fig. 1 and fig. 2, the filter 14 is disposed behind the wavelength conversion device 13 for filtering the illumination light, so that the color of the illumination light is purer. The filtering device 14 includes a filter 140. The filter 140 has a disk shape, and is divided into several parts in a circumferential direction, and each part of the filter 140 can transmit light in a specific wavelength range.

In the present embodiment, the filter 140 includes a plurality of filter regions for allowing light of a specific wavelength range to pass through. It is understood that the filter regions can be a red filter region, a blue filter region, a green filter region, a yellow filter region, etc., which can be set as required. Therefore, since the filter device 14 rotates continuously, the white light can be time-sequenced to generate time-sequenced light of a specific color after passing through the filter 140 of the filter device 14.

The graph 3 shows the absorption coefficient curves of the organ or tissue to be examined for different wavelengths of illumination light. As shown in fig. 3, the absorption rates of the organ or tissue to be examined for light of respective colors (or wavelengths) are different.

Further, as can be seen from fig. 4, the absorption coefficient of the organ or tissue to be detected to blue light is high, and the light intensity of the blue light reflected by the organ or tissue to be detected is lower than that of the irradiated blue light, which indicates that the blue light is lost much in the irradiation and reflection processes; the organ or tissue to be examined has a low absorption coefficient for red light, and the red light reflected by the organ or tissue to be examined has a high light intensity relative to the red light, so that the loss of the red light in the irradiation and reflection processes is low, and therefore, in order to enable the illumination light to be irradiated on the organ or tissue to be examined to display a real image, the ratio of different colors of light in the illumination light needs to be adjusted according to the light absorption coefficient of the organ or tissue to be examined.

It can be understood that for the normal tissue or the pathological tissue to be detected, the absorption rates of the light with different wavelengths can be different from that of the normal tissue. In order to make the user distinguish different tissues, pathological tissues and normal tissues obviously, the organ or tissue to be detected can be illuminated by the illuminating light with different spectral components according to the difference of the light absorption coefficients of the different tissues.

It can be understood that, the absorption coefficients of different organs or tissues for the illumination lights with different wavelengths are different, so when determining the primary light component of the emergent light, the spectral curves of different organs or tissues for the absorption (or reflection) of different wavelengths are tested, and then the ratios of different colors of light in the emergent light are adjusted according to the absorption (or reflection) conditions of the organs or tissues.

In this embodiment, the ratio of light of different colors in the illumination light can be adjusted by adjusting the light intensity of the excitation light and/or adjusting the wavelength conversion device and/or adjusting the filter device. The above-described embodiments will be further explained below.

In the present embodiment, the light source device 10 can adjust the light ratio of different colors in the illumination light by the light source control unit 11 adjusting the intensity of the excitation light of the light source 12 in different periods of the same pulse cycle.

Specifically, the excitation light emitted from the light source 12 at different periods within the same pulse cycle illuminates different areas of the wavelength conversion device 13. For example, the wavelength conversion material has a blue phosphor region and a green phosphor region, and the light source 12 has an excitation light period corresponding to the yellow phosphor region and an excitation light period corresponding to the green region in the same pulse cycle. Therefore, when the proportion of the blue light in the illumination light needs to be increased, the intensity of the excitation light in the excitation light period corresponding to the blue phosphor region of the light source can be increased, and the intensity of the excitation light in the excitation light period corresponding to the green phosphor region is unchanged, so that the blue excited light generated after the excitation light irradiates the blue phosphor region of the wavelength conversion device 13 is increased, and meanwhile, the green excited light is kept unchanged, thereby increasing the proportion of the blue light in the excited light, and further achieving the purpose of increasing the proportion of the blue light in the illumination light.

It can be understood that the blue light proportion of the illumination light can also be improved by keeping the intensity of the excitation light in the excitation light period of the light source 12 corresponding to the blue light region constant, and reducing the intensity of the excitation light in the excitation light period of the light source 12 corresponding to the green region; or increasing the intensity of the excitation light in the excitation light period corresponding to the blue region of the light source 12, and decreasing the intensity of the excitation light in the excitation light period corresponding to the green region of the light source 12 to increase the blue light ratio of the illumination light.

In the present embodiment, the adjustment of the light intensity of the laser in different periods is realized by adjusting the current of the light source 12. When the current of the light source 12 is increased, the intensity of the laser emitted by the light source 12 is increased; when the current of the light source 12 is reduced, the intensity of the laser light emitted from the light source 12 is reduced.

Further, in the present embodiment, the light ratios of different colors in the illumination light can be adjusted by adjusting the area ratios of different regions on the wavelength conversion device 13.

Specifically, the areas of the plurality of regions of the wavelength conversion device 13 may be adjusted as needed. When the area of the specific region of the wavelength conversion device 13 irradiated by the light source 12 increases or decreases, the intensity of the excited light passing through the specific region of the wavelength conversion device 13 correspondingly increases or decreases, and the ratio of the specific color light in the illumination light is adjusted.

For example, the wavelength conversion device 13 includes a blue phosphor region and a green phosphor region, and when the blue light proportion in the illumination light needs to be increased, the blue stimulated light passing through the blue phosphor region can be increased by increasing the area of the blue phosphor region and simultaneously decreasing the area of the green phosphor, and the green phosphor passing through the green phosphor region is decreased, so that the blue light proportion in the stimulated light is increased, and the purpose of increasing the blue light proportion in the illumination light is achieved.

It can be understood that when the area ratio of different phosphors on the wavelength conversion device 13 changes, the pulse period of the light source 12 needs to be adjusted to match the wavelength conversion device 13. Further, in the present embodiment, the wavelength conversion device 13 is provided with an adjustment mechanism capable of adjusting the area ratio of different regions on the wavelength conversion device 13. In particular, the adjusting mechanism can achieve the purpose of adjusting the area ratio of different areas by shielding partial areas.

Further, in the present embodiment, a blue phosphor layer is included on the wavelength conversion device 13. It can be understood that, since the spectral component of the blue laser is narrow, a wide-band blue laser can be formed when the narrow-band blue excitation light excites the blue phosphor layer, thereby facilitating a user to distinguish images of different organs or tissues of the test object.

Further, in the present embodiment, the light ratio of different colors in the illumination light can be adjusted by adjusting the area ratio of different filter regions on the filter device 14.

Specifically, different filter regions on the filter device 14 can be adjusted as needed, so that the light intensity of the received laser light passing through the wavelength conversion device 13 after being filtered by the filter device 14 changes, and the ratio of the received laser light of different colors is adjusted, thereby achieving the purpose of adjusting the ratio of the light of different colors in the illumination light.

For example, the filter device includes a blue filter area and a green filter area, and when the blue light proportion in the illumination light needs to be increased, the area of the blue filter area can be increased, and the area of the green filter area can be decreased, so that the blue light filtered by the blue filter area is increased, and the green light filtered by the green filter area is decreased, thereby achieving the purpose of increasing the blue light proportion in the illumination light.

Further, in the present embodiment, an adjusting mechanism is provided on the filtering device 14, and the adjusting mechanism can adjust the area ratio of different filtering regions on the filtering device 14. Specifically, the adjusting mechanism can achieve the purpose of adjusting the area occupation ratio of different filter regions by shielding part of the filter regions.

It can be understood that the above three ways can be used individually or in combination when the proportion of light with different colors in the illumination light needs to be adjusted.

The endoscope insertion portion 20 includes a diffuser 21 and a lens group 22. The diffuser 21 and the lens group 22 are disposed on a propagation path of the light emitted from the light source device 10. The diffuser 21 is used for homogenizing the laser light of multiple colors generated by the filter 14 in time sequence and then illuminating the organ or tissue to be detected. The lens assembly 22 is configured to adjust a light distribution angle of the reflected light, so as to focus the light reflected by the organ or tissue to be examined, and further enable the reflected light to be transmitted to the processor 30 more intensively, and to form an image on a corresponding shooting surface.

The processor 30 includes an imaging element 31, an imaging control section 32, an image processor 33, a second control section 34, and a storage section 35. The image pickup device 31, the image pickup control unit 32, the image processor 33, the second control unit 34, and the storage unit 35 are electrically connected together.

In the present embodiment, the imaging element 31 is preferably a light field camera which images an observation site of an organ or tissue to be examined illuminated with illumination light from the light source device 10, receives different light signals in time series, and converts the light signals into video signals. In other embodiments, the camera may be other cameras, such as a color CCD. The light field camera comprises a black-and-white CCD chip, the black-and-white CCD chip can record optical signals with different depths of field (levels and depths), and can also convert the optical signals of various colors generated by the light filtering device into electric signals. The imaging element 31 has an imaging surface (not shown), so that light reflected by the organ or tissue to be examined can be imaged on the imaging surface of the imaging element 31.

The imaging control unit 32 is connected to a second control unit 34 in the processor 30, and inputs a drive signal to the imaging element 31 in synchronization with a base clock signal input from the second control unit 34. The image pickup device 31 outputs a pickup signal to the image processor 33 at a predetermined frame rate in accordance with a drive signal from the pickup control unit 32. The image processor 33 performs image signal processing on the photographing signal output from the photographing element 31, that is, converts image data into a video signal such as a composite signal or a component signal to generate image data. The storage unit 35 is used for storing, but not limited to, image data generated by the image processor 33 and ratio data of each adjustable primary color light of the light source device 10, and thus is selectable by a user when used.

It is understood that the imaging control section 32 can control the start and end of driving, the driving time, the synchronization timing, and the like of each section of the imaging element 31.

Fig. 5 shows a shooting mode in which the shooting control section 32 controls the shooting element 31. As shown in fig. 5, the imaging element 31 performs an operation of accumulating the signal charges and an operation of reading the accumulated signal charges in one frame period by the control of the imaging control unit 32. The image pickup device sequentially picks up image light of three colors of blue, green, and red for each frame, accumulates signal charges, and sequentially outputs pickup signals of blue, green, and red based on the accumulated signal charges. The above-described operation is repeated during the observation mode of the organ or tissue to be examined.

It is understood that the image processor 33 is provided with a plurality of processing sections in order to increase the number of pixels of the imaging device 31, reduce the memory of image data, and increase the processing speed of image data. As shown in fig. 6, the image processor 33 includes a blue image conversion part 331, a green image conversion part 332, and a red image conversion part 333. The blue light image conversion part 331 is configured to process the blue light signal of each frame of image, and convert the corresponding blue light signal into the surface layer, middle layer, and deep layer signals of the organ or tissue to be examined. The green light image conversion part 332 is configured to process the green light signal of each frame of image, and convert the corresponding green light signal into the surface layer, middle layer, and deep layer signals of the organ or tissue to be examined. The red light image conversion part 333 is used to process the red light signal of each frame of image and convert the corresponding red light signal into the surface layer, middle layer and deep layer signals of the organ or tissue to be detected.

Further, the image processor 33 further includes an image combining unit 334, where the image combining unit 334 is configured to combine the first surface signal, the second surface signal, and the third surface signal to obtain a surface image signal of the organ or tissue to be examined. The image combining unit 334 is further configured to combine the first middle layer signal, the second middle layer signal and the third middle layer signal to obtain a middle layer image signal of the organ or tissue to be detected. The image combining unit 334 is further configured to combine the first deep signal, the second deep signal and the third deep signal to obtain a deep image signal of the organ or tissue to be examined.

It can be understood that the surface, middle and deep images of the organ or tissue to be detected are composed of three signals of blue light, green light and red light, so that the image processor 33 distinguishes the blue light, green light and red light signals obtained by the shooting element 31 at different depths to separate the blue light, green light and red light signals at each depth, and then combines the blue light, green light and red light signals to obtain the surface, middle and deep image signals of the organ or tissue to be detected.

It can be understood that the blue light, green light and red light signals obtained by the shooting element 31 can be distinguished by different depths of the blue light, the green light and the red light through an algorithm in software.

The first control part 40 is used for storing parameter information of different organs or tissues and facilitating a user to input parameters or adjust an operation mode of the light source device 10. Specifically, the first control part 40 stores light absorption parameters of different tissues or organs, which can input signals to the light source device 10 according to different organs to be photographed so as to control different components in the output light of the light source device. For example, when taking images of the stomach and taking images of the intestine, the user may input different signals to adjust different operating modes of the light source apparatus 10 according to the control 40.

The processor 30 can control the display unit 50 to convert the image data generated by the image processor 33 into a video signal such as a composite signal or a component signal, thereby displaying a clear image. As shown in fig. 7, the display portion 50 includes a first display area 51, a second display area 52, and a third display area 53. The first display area 51 is used for displaying the surface image of the organ or tissue to be examined, the second display area 52 is used for displaying the middle layer image of the organ or tissue to be examined, and the third display area 53 is used for displaying the deep layer image of the organ or tissue to be examined.

It is understood that the endoscope system 100 further includes an endoscope operation portion (not shown) disposed between the light source device 10 and the processor 30, a power-on cable (not shown) for establishing a communication connection between the light source device 10 and the endoscope insertion portion 20 and the processor 30, and an optical fiber (not shown) for transmitting the light emitted from the light source device 10 to the organ or tissue to be examined and transmitting the light reflected from the organ or tissue to the processor 30.

According to the endoscope system, the light source device with adjustable ratios of the blue light, the green light and the red light in the primary colors is arranged, namely the light source device can match light sources with different primary color light components according to different light absorption rates of organs or tissues to be detected, so that a shooting element of the endoscope system can directly collect light signals. In addition, the endoscope system of the invention adopts the light field camera as the shooting element, not only can clearly image the observation part of the organ or tissue to be detected, but also can display real color, thereby facilitating the observation and diagnosis of the internal tissue of the detected body by the user.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and the above embodiments are only used for explaining the claims. The scope of the invention is not limited by the description. Any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present disclosure are included in the scope of the present invention.

Claims

1. An endoscopic system comprising:

a light source device including a light source that emits excitation light and a wavelength conversion device that generates stimulated light by excitation of the excitation light, the excitation light and the stimulated light forming illumination light and being guided to the organ or tissue to be examined through the endoscope insertion portion, a ratio of each of primary color light of blue light, green light, and red light in the illumination light being adjustable according to a difference in light absorption rate of the organ or tissue to be examined with respect to different wavelengths;

the processor comprises a shooting element which is a light field camera, the light field camera shoots an observation part of an organ or tissue to be detected illuminated by illumination light from the light source device, receives different light signals according to time sequence and converts the light signals into video signals, the light field camera sequentially shoots image light of each primary color light of blue light, green light and red light for each frame of image and sequentially outputs the blue light signal, the green light signal and the red light signal of each frame of image, the processor comprises a red image conversion part, a green image conversion part and a blue image conversion part, the red image conversion part is used for processing the red light signal of each frame of image and converting the corresponding red light signal into a first surface signal, a first middle layer signal and a first deep layer signal of the organ or tissue to be detected, the green image conversion part is used for processing the green light signal of each frame of image, the blue image conversion part is used for processing the blue light signal of each frame image and converting the corresponding blue light signal into a third surface layer signal, a third middle layer signal and a third deep layer signal of the organ or tissue to be detected; and

2. An endoscope system according to claim 1 and also comprising filter means for filtering said stimulated light generated by said wavelength conversion means, wherein the ratio of each of the primary colors of blue, green and red in said illumination light is achieved by adjusting the intensity of said light source and/or adjusting said wavelength conversion means and/or adjusting said filter means.

3. The endoscope system of claim 1 wherein said light source means further comprises a light source control section, said light source control section adjusting the magnitude of current of said light source at different time intervals within the same pulse interval to thereby adjust the light intensity of said light source.

4. An endoscope system according to claim 1 and wherein said wavelength conversion device comprises a plurality of regions each carrying either the same wavelength conversion material or no wavelength conversion material or a different wavelength conversion material, said wavelength conversion device further comprising an adjustment mechanism which adjusts the area fraction of a plurality of said regions to adjust the blue, green and red primary light fractions in said illumination light.

5. The endoscope system of claim 2 wherein said filter means comprises a plurality of filter zones and an adjustment mechanism that adjusts the area fraction of said filter zones to adjust the blue, green, and red primary light fractions of said illumination light.

6. The endoscopic system of claim 1 wherein said light field camera comprises a black and white ccd chip for recording light signals of different depths of said organ or tissue to be examined.

7. The endoscope system of claim 1, wherein said processor further comprises an image combining section for combining said first surface signal, said second surface signal and said third surface signal to obtain a surface image signal of said organ or tissue to be examined; combining the first middle layer signal, the second middle layer signal and the third middle layer signal to obtain a middle layer image signal of the organ or tissue to be detected; and combining the first deep signal, the second deep signal and the third deep signal to obtain a deep image signal of the organ or tissue to be detected.

8. The endoscope system according to claim 7, wherein said display section comprises a first display area for displaying a superficial layer image of said organ or tissue to be examined, a second display area for displaying a middle layer image of said organ or tissue to be examined, and a third display area for displaying a deep layer image of said organ or tissue to be examined.