CN103654687A - Endoscope system, light source device for endoscope and manufacturing method of endoscope images - Google Patents
Endoscope system, light source device for endoscope and manufacturing method of endoscope images Download PDFInfo
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Abstract
The invention provides an endoscope system, a light source device for an endoscope and a manufacturing method of endoscope images. According to the invention, high-definition general images, blood vessel emphasizing images and oxygen saturation images can be obtained with fewer frames. A rotary filter comprises an open part transmitting broad-band light as original, a measurement filter part transmitting oxygen saturation measuring light of 450-500nm in the broad-band light, and a blood vessel emphasizing filter part transmitting blood vessel emphasizing illuminating light of 405-425nm and 530-550nm in the broad-band light. The area of the measurement filter part and the area of the blood vessel emphasizing filter part are greater than that of the open part. Thus, the illuminating time of the oxygen saturation measuring light and the illuminating time of the blood vessel emphasizing illuminating light become longer than illumination time of the broad-band light.
Description
Technical field
The present invention relates to obtain the method for making that common image, oxygen saturation image and blood vessel are emphasized endoscopic system, light source device for endoscope and the endoscopic images of image simultaneously.
Background technology
In medical field in recent years, the endoscopic system that possesses light supply apparatus, endoscope apparatus and processor device is widely used.In having utilized the diagnosis of this endoscopic system, the insertion section of endoscope is inserted in a corpse or other object for laboratory examination and chemical testing, utilize the illumination light of provision wavelengths to throw light on to a corpse or other object for laboratory examination and chemical testing from its leading section, utilize the imaging apparatus of leading section to make a video recording to the viewing area in a corpse or other object for laboratory examination and chemical testing simultaneously, obtain thus the endoscopic images that reflects the various biological informations that present on viewing area.
As endoscopic images, the common image obtaining except taking the visible ray picture of the viewing area after utilizing white light illuminated, also use narrow band light by the high wave band of from the specific absorbance to viewing area illumination hemoglobin make blood vessel that the contrast of superficial blood vessel, mid-deep strata blood vessel has improved emphasize image and by utilize a narrow band light illumination corpse or other object for laboratory examination and chemical testing for the specific absorbance of the HbO2 Oxyhemoglobin different absorption bandses different with the specific absorbance of reduced hemoglobin make the oxygen condition of blood vessel visual oxygen saturation image.Because these 3 endoscopic images respectively have length, therefore by show that at monitor 3 endoscopic images are not only to show 1 image simultaneously, thereby can realize the diagnosis from various viewpoints.
In the situation that emphasize image and these 3 endoscopic images of oxygen saturation image with common image, blood vessel that the imaging apparatus of black and white obtains these successively, about common image, need the illumination of amount of 3 frames of rgb light, about blood vessel, emphasize image, needing centre wavelength is the illumination light of the amount of the blue narrow band light of 415nm and 2 frames of the green narrow band light that centre wavelength is 540nm, about oxygen saturation image, need to comprise the illumination of amount of 1～3 frame of the illumination of the illumination light based on different absorption bandses.That is, in order almost to obtain common image, the blood vessel of 1 frame simultaneously, emphasize that image and oxygen saturation image are (because regard as simultaneously, so be simply called below simultaneously.), total need to be thrown light on accordingly with 6～8 frames.Therefore, if obtain this 3 images simultaneously, 1 cycle became 6～8 frames, so the frame rate of image (temporal resolution) can step-down.
With respect to this, in Japanese Patent Publication 6-6104 communique, recorded following method, that is: by the imaging apparatus with colored, carry out illumination and the shooting in a corpse or other object for laboratory examination and chemical testing, can not reduce frame rate thus, can obtain these 2 images of common image and oxygen saturation image simultaneously.As this Japanese Patent Publication 6-6104 communique, in the situation that with colored imaging apparatus obtain common image, blood vessel is emphasized image and these 3 images of oxygen saturation image, about common image, only utilize the white light of the amount of 1 frame just can obtain, about blood vessel, emphasize image, only irradiate the narrow band light of the amount of 1 frame after the light colour mixture of 415nm, 540nm just can be obtained.Therefore,, than the situation of having used the imaging apparatus of black and white, can be reduced by least illumination and the shooting of the amount of 3 frames.
As above-mentioned, in the situation that use colored imaging apparatus, although can reduce the frame number in 1 cycle, than the situation of having used the imaging apparatus of black and white, likely can reduce the image quality such as lightness of integral image.Therefore,, when obtaining common image, blood vessel and emphasizing image and these 3 images of oxygen saturation image, be required the few and high image quality of the frame number in every 1 cycle and obtain each image.
Summary of the invention
The object of the present invention is to provide a kind of common image, blood vessel that obtains high image quality with less frame number to emphasize the method for making of endoscopic system, light source device for endoscope and the endoscopic images of image and oxygen saturation image.
In order to reach above-mentioned purpose, endoscopic system of the present invention is characterised in that to possess: wideband light source, produces broadband light; Convolutional filter, have the 1st and see through region and the 3rd through region through region, the 2nd, the described the 1st sees through the light transmission that region makes the 1st wave band among broadband light, the described the 2nd sees through the light transmission that region makes 2nd wave band different with the specific absorbance of reduced hemoglobin of the specific absorbance of HbO2 Oxyhemoglobin among broadband light, the described the 3rd sees through the light transmission that region makes the 3rd wave band that the specific absorbance of hemoglobin is high among broadband light, and the 1st to the 3rd area that sees through region decides according to the 1st bandwidth to the 3rd wave band; Endoscope apparatus, irradiates the 1st light to the 3rd wave band that has seen through convolutional filter successively to a corpse or other object for laboratory examination and chemical testing, and obtains the 1st to the 3rd image information by the colored imaging apparatus corpse or other object for laboratory examination and chemical testing of making a video recording successively; Conventionally image is made parts, according to the 1st image information, makes common image; Oxygen saturation image is made parts, according to the 2nd image information, makes the oxygen saturation image after the oxygen saturation image conversion of blood hemoglobin; Make parts with arrowband image, according to the 3rd image information, make arrowband image.
Preferably the 1st wave band has than the 2nd and the 3rd wave band wide bandwidth also, and the 2nd and the 3rd area that sees through region is greater than the 1st area that sees through region.Preferably the 1st is the open area that broadband light former state is seen through through region.Preferred oxygen saturation image is made parts and is carried out the standardized images information after standardization based on specific image information image information in addition among the specific image information among the 2nd image information with the information of oxygen saturation being utilized to the 1st to the 3rd image information, makes oxygen saturation image.
Preferably wideband light source can be the 1st light value by light quantity setting, with than the 1st light value large the 2nd light value also, convolutional filter sees through region except the 1st to the 3rd through also having the 4th region, the described the 4th see through region make broadband light among bandwidth light quantity constant and that only reduce after light quantity reduce light transmission, when the light quantity setting of broadband light is the 2nd light value, endoscope apparatus replaces the 1st image information and obtains the 4th image information, a described corpse or other object for laboratory examination and chemical testing after described the 4th image information shooting utilizes light quantity reduction light illuminated obtains, when the light quantity setting of broadband light is described the 2nd light value, conventionally image is made parts replacement the 1st image information and is made common image based on the 4th image information.Preferably the 4th wave band has than the 2nd and the 3rd wave band wide bandwidth also, and the 2nd and the 3rd area that sees through region is greater than the 4th area that sees through region.Preferred oxygen saturation image is made parts and is carried out the standardized images information after standardization based on specific image information image information in addition among the specific image information among the 2nd image information with the information of oxygen saturation being utilized to the 2nd to the 4th image information, makes oxygen saturation image.
Preferably the 2nd wave band is 450～500nm, and the 3rd wave band is 405～425nm and 530～550nm.
Light source device for endoscope of the present invention is characterised in that to possess: wideband light source, produces broadband light, and convolutional filter, have the 1st and see through region, the 2nd sees through region and the 3rd sees through region, the described the 1st sees through the light transmission that region makes the 1st wave band among broadband light, the described the 2nd sees through the light transmission that region makes 2nd wave band different with the specific absorbance of reduced hemoglobin of the specific absorbance of HbO2 Oxyhemoglobin among broadband light, the described the 3rd sees through the light transmission that region makes the 3rd wave band that the specific absorbance of hemoglobin is high among broadband light, the the 1st to the 3rd area that sees through region decides according to the 1st bandwidth to the 3rd wave band, the 1st light to the 3rd wave band that has seen through convolutional filter is supplied to endoscope apparatus.
Preferably the 1st wave band has the bandwidth in broadband, and the 2nd and the 3rd wave band has the bandwidth of arrowband, and the 2nd and the 3rd area that sees through region is greater than the 1st area through region.Preferably convolutional filter sees through and region, also has the 4th and see through region except the 1st to the 3rd, the described the 4th see through region make broadband light among bandwidth light quantity constant and that only reduce after light quantity reduce light transmission.
The method for making of endoscopic images of the present invention is characterised in that, by wideband light source, produces broadband light; Make broadband light be incident to convolutional filter, described convolutional filter has the 1st and sees through region and the 3rd through region through region, the 2nd, the described the 1st sees through the light transmission that region makes the 1st wave band among broadband light, the described the 2nd sees through the light transmission that region makes 2nd wave band different with the specific absorbance of reduced hemoglobin of the specific absorbance of HbO2 Oxyhemoglobin among broadband light, the described the 3rd sees through the light transmission that region makes the 3rd wave band that the specific absorbance of hemoglobin is high among broadband light, and the 1st to the 3rd area that sees through region decides according to the 1st bandwidth to the 3rd wave band; To a corpse or other object for laboratory examination and chemical testing, irradiate successively the 1st light to the 3rd wave band that has seen through convolutional filter, and obtain the 1st to the 3rd image information by the colored imaging apparatus corpse or other object for laboratory examination and chemical testing of making a video recording successively; According to the 1st image information, make common image; According to the 2nd image information, make the oxygen saturation image after the oxygen saturation image conversion of blood hemoglobin; According to described the 3rd image information, make arrowband image.
Invention effect
According to the present invention, the 1st to the 3rd area that sees through region of convolutional filter decides according to the 1st bandwidth to the 3rd wave band.Therefore,, about making the region that sees through of arrowband that narrow band light sees through, by area being set to such an extent that be greater than the region that sees through in other broadbands, thereby can extend the irradiation time of this narrow band light.Thus, even if also can not cause deficiency in light quantity to a corpse or other object for laboratory examination and chemical testing internal radiation narrow band light in the situation that, therefore the lightness based on the made oxygen saturation image of narrow band light, arrowband image can fully be maintained.In addition,, owing to having used color image sensor, therefore can under the state few at the frame number in 1 cycle, obtain common image, arrowband image and oxygen saturation image.Thus, the present invention can not reduce frame rate and just can obtain the image of high image quality.
Accompanying drawing explanation
Fig. 1 means the schematic drawing of the outward appearance of endoscopic system.
Fig. 2 means the block diagram that the inside of endoscopic system forms.
Fig. 3 means the top view of the convolutional filter of the 1st embodiment.
Fig. 4 A means the curve chart of measuring with the spectrophotometric transmittance of wave filter portion.
Fig. 4 B means that blood vessel emphasizes the curve chart with the spectrophotometric transmittance of wave filter portion.
Fig. 5 means the curve chart of the specific absorbance of HbO2 Oxyhemoglobin and reduced hemoglobin.
Fig. 6 means the curve chart of the specific absorbance of hemoglobin.
Fig. 7 A means the key diagram of the B pixel, G pixel and the R pixel that are arranged on the color image sensor of former colour system.
Fig. 7 B means the curve chart of spectrophotometric transmittance of the color filter of B color, G color and R color.
Fig. 8 A is the key diagram of the action of the imaging apparatus in the common display mode of performance.
Fig. 8 B is the key diagram of action of the imaging apparatus in the special display mode of performance the 1st embodiment.
Fig. 9 means the block diagram of the function of image processing part.
Figure 10 means the curve chart of the dependency relation of strength ratio B/G, R/G and oxygen saturation.
Figure 11 means the key diagram of computational methods of the oxygen saturation of the dependency relation that adopts Figure 10.
Figure 12 means the curve chart of the relation between oxygen saturation and gain.
Figure 13 means the flow chart of a succession of flow process of special display mode.
Figure 14 means the image graph of the common image, arrowband image and the oxygen saturation image that are simultaneously displayed in display device.
Figure 15 means the top view of the convolutional filter of the 2nd embodiment.
Figure 16 means the key diagram of the action of the imaging apparatus in the special display mode of the 2nd embodiment.
Figure 17 means the curve chart of spectrophotometric transmittance of the color filter of C color, M color, Y color and G color.
The specific embodiment
As shown in Figure 1, the endoscopic system 10 of the 1st embodiment possesses: light supply apparatus 11, produces the light that the viewing area in a corpse or other object for laboratory examination and chemical testing is thrown light on; Endoscope apparatus 12, utilizes from the light of light supply apparatus 11 viewing area in illumination is made a video recording; Processor device 13, the view data that the shooting by endoscope apparatus 12 is obtained is carried out image processing; Display device 14, shows process endoscopic images of obtaining etc. by image; With input equipment 15, by keyboard etc., formed.
In endoscope apparatus 12, white operating portion 16 sides rise and are provided with successively bending section 17, bending section 18 and observer (scope) leading section 19.Due to bending section 17 have flexible, therefore can be crooked freely.Bending section 18 is constituted as by being configured in the rotating operation of angulation knob 16a of operating portion 16 crooked freely.Because this bending section 18 can bend to arbitrarily direction, angle arbitrarily according to the position of a corpse or other object for laboratory examination and chemical testing etc., therefore can make observer leading section 19 towards desired look-out station.
As shown in Figure 2, light supply apparatus 11 possesses: white light source 30; Convolutional filter 31, its light that is provision wavelengths by the broadband light BB wavelength separated from this white light source 30; Motor 32, the rotating shaft 27 of itself and convolutional filter 31, and make convolutional filter 31 rotations with certain rotary speed; Spin Control portion 34, its action to convolutional filter 31 is controlled; Collecting lens 35, it carries out optically focused to having seen through the light of convolutional filter 31; Optical fiber 36, its incident is from the light of collecting lens 35; With branching portion 37, its optical branch that makes to be incident to optical fiber 36 becomes the light of 2 systems.
In the inboard of observation window 42, be provided with for being taken into the object lens 45 from the light of the viewing area of a corpse or other object for laboratory examination and chemical testing, and then in the inboard of this object lens 45, be provided with the imaging apparatuss 60 such as CCD (Charge Coupled Device) of taking viewing area.This imaging apparatus 60 is colored imaging apparatus, at sensitive surface (shooting face), accepts the light from object lens 45, and the light receiving is carried out to light-to-current inversion and exports image pickup signal (analogue signal).In addition, as imaging apparatus 60, although use the CCD of IT (interline transfer) type, in addition can also use the CMOS (Complementary Metal-Oxide Semiconductor) with global shutter.
From the image pickup signal of imaging apparatus 60 outputs, by observer cable 67, be input to A/D changer 68.A/D changer 68 is transformed into the view data corresponding with its voltage level (digital signal) by image pickup signal.View data after conversion is input to processor device 13 via adapter portion 42.Imaging control part 70 is carried out the shooting of imaging apparatus 60 and is controlled.This shooting is controlled because of each pattern difference.
As shown in Figure 3, in being located at the convolutional filter 31 of light supply apparatus 11, along circumferencial direction, be provided with: peristome 31a, it makes to see through from the broadband light BB former state of white light source 30; Measure with the 31b of wave filter portion (being labeled as " measure and use " in Fig. 3), it makes for measuring the oxygen saturation mensuration light (oxygen saturation mensuration illumination light) of oxygen saturation, to see through among broadband light BB; Emphasize with the 31c of wave filter portion (being labeled as " blood vessel emphasize with " in Fig. 3) with blood vessel, it makes among broadband light BB the blood vessel for the superficial blood vessel of a corpse or other object for laboratory examination and chemical testing and mid-deep strata blood vessel are emphasized emphasize to see through by illumination light.In this convolutional filter 31, the area S1 of peristome 31a is minimum, measure with the area S2 of the 31b of wave filter portion and be greater than the area S1 of peristome 31a and be less than the area S3 that blood vessel emphasizes to use the 31c of wave filter portion, blood vessel is emphasized the area S3 maximum (S1 < S2 < S3) with the 31c of wave filter portion.
As shown in Figure 4 A, measure the oxygen saturation mensuration light transmission that makes the wave-length coverage 450～500nm different with the specific absorbance (with reference to Fig. 5) of reduced hemoglobin Hb of the specific absorbance of HbO2 Oxyhemoglobin Hb02 among broadband light BB with the 31b of wave filter portion.Extinction characteristic when extinction characteristic when this oxygen saturation is measured to rayed to the blood vessel of hypoxia is different from the blood vessel that exposes to high oxygen condition.The extinction characteristic causing by the difference of utilizing because of the oxygen condition of this blood vessel poor, can measure the oxygen saturation of blood hemoglobin.In addition, preferably oxygen saturation is measured light centre wavelength is made as to 473nm.
As shown in Figure 4 B, blood vessel emphasizes that with the 31c of wave filter portion, making among broadband light BB having centre wavelength is 415nm and the wave-length coverage blue narrow band light that is 405～425nm and to have centre wavelength be that the blood vessel that green narrow band light that 540nm and wave-length coverage are 530～550nm is carried out after colour mixture is emphasized to see through by illumination light.As shown in Figure 6, this blood vessel emphasizes by the blue narrow band light of illumination light and the wave-length coverage of green narrow band light it is the high wave band of specific absorbance of blood hemoglobin in blue wave band and green wave band.Therefore, by irradiate this blood vessel to a corpse or other object for laboratory examination and chemical testing, emphasize by illumination light, thereby absorb the superficial blood vessel of blue narrow band light, uprise with the contrast not absorbing between the mucosa of blue narrow band light, so superficial blood vessel can be emphasized demonstration.In addition, because the mid-deep strata blood vessel that absorbs green narrow band light and the contrast not absorbing between the mucosa of green narrow band light uprise, so mid-deep strata blood vessel also can be emphasized demonstration.
The action of convolutional filter 31 is because of each pattern difference.When being set to common display mode, the peristome 31a of convolutional filter 31 is placed in to the position in the light path of broadband light BB.Under this state, convolutional filter 31 stops.Therefore,, when common display mode, broadband light BB is exposed in a corpse or other object for laboratory examination and chemical testing by former state.
On the other hand, when being set to special display mode, convolutional filter 31 is with certain rotary speed rotation.Thus, broadband light BB emphasizes with wave filter portion 31c incident to peristome 31a, the mensuration of convolutional filter 31 with the 31b of wave filter portion and blood vessel in the different moment.Therefore,, when special display mode, broadband light, oxygen saturation measure light and blood vessel is emphasized to be exposed in a corpse or other object for laboratory examination and chemical testing successively by illumination light.At this, because peristome 31a, the mensuration of convolutional filter 31 emphasize to exist with area S1, S2, the S3 of the 31c of wave filter portion the relation of S1 < S2 < S3 with the 31b of wave filter portion and blood vessel, therefore the irradiation time T1 of broadband light BB is the shortest, second long be the irradiation time T2 that oxygen saturation is measured light, blood vessel is emphasized the irradiation time T3 the longest (T1 < T2 < T3) by illumination light.
As more than, by blood vessel emphasize irradiation time T3 by illumination light establish than the irradiation time T1 of broadband light BB long the reasons are as follows described in.Because blood vessel emphasizes that by illumination light be the light that the wavelength arrowband of broadband light BB is obtained, therefore to compare with broadband light BB, light quantity is little.Thereby, in the situation that the irradiation time T1 of supposition broadband light BB and blood vessel emphasize to use the irradiation time T3 of illumination light roughly the same, based on blood vessel, emphasize that the arrowband image of making by illumination light can become darker than the common image of making based on broadband light BB.So, by irradiation time T3 being established long according to penetrating time T 1, extending the electric charge savings time of imaging apparatus 60, the lightness that can make thus common image and arrowband image is homogenization roughly.
In addition the irradiation time T2 that, oxygen saturation is measured to light establish than the irradiation time T1 of broadband light BB long the reasons are as follows described in.Because oxygen saturation is measured light and blood vessel and emphasized that by illumination light be the light that the wavelength arrowband of broadband light BB is obtained equally, so compare with broadband light BB, light quantity is little.Like this, in oxygen saturation, measure under the situation that the light quantity of light reduces, cannot obtain sufficient S/N, therefore sometimes cannot correctly calculate oxygen saturation.So, by oxygen saturation being measured to the irradiation time T2 of light, establish longlyer than the irradiation time T1 of broadband light BB, extend the electric charge savings time of imaging apparatus 60, can obtain sufficient S/N thus.
As shown in Figure 7 A, acceptance is measured light and blood vessel from the broadband light of a corpse or other object for laboratory examination and chemical testing, oxygen saturation and is emphasized that catoptrical imaging apparatus 60 by illumination light possesses a plurality of pixel group, and pixel group is made as 1 group by the B pixel 60b that is provided with the color filter of B color, the G pixel 60g of color filter that is provided with G color and the R pixel 60r that is provided with the color filter of R color.Because the color filter of B color, G color, R color has respectively the transmitance shown in the curve 63,64,65 of Fig. 7 B, therefore the color filter of B color makes the light transmission of blue wave band, the color filter of G color makes the light transmission of green wave band, and the color filter of R color makes the light transmission of red wave band.
Shooting in the corpse or other object for laboratory examination and chemical testing that imaging apparatus 60 carries out is because of each pattern difference.As shown in Figure 8 A, in common display mode, that utilizes 60 couples of broadband light BB of imaging apparatus carries out light-to-current inversion as light, and from B pixel 60b, G pixel 60g, R image 60r successively output blue signal Bc, green Gc, danger signal Rc.Like this, imaging apparatus 60 carries out electric charge savings in 1 frame interval and electric charge is read, and generates 1 common image.In asking in the phase that is set to common display mode, repeatedly carry out a succession of action.And, by these blue signals Bc, green Gc, danger signal Rc being carried out to A/D conversion, obtain blue image data Bc, green image data Gc, red image data Rc.
As shown in Figure 8 B, in special display mode, in during irradiating with irradiation time T1 at broadband light BB, utilize 60 couples of broadband light BB of imaging apparatus to carry out light-to-current inversion, and from B pixel 60b, G pixel 60g, R image 60r successively output blue signal Bc, green Gc, danger signal Rc.Irradiation at broadband light BB finishes, when the irradiation of oxygen saturation mensuration light starts, in during irradiating with irradiation time T2 at oxygen saturation mensuration light, utilize 60 pairs of oxygen saturations of imaging apparatus to measure light and carry out light-to-current inversion, and from B pixel 60b, G pixel 60g, R image 60r successively output blue signal Bm, green Gm, danger signal Rm.The irradiation of measuring light in oxygen saturation finishes, when blood vessel emphasizes that the irradiation by illumination light starts, in during emphasizing to irradiate with irradiation time T3 by illumination light at blood vessel, utilize 60 pairs of blood vessels of imaging apparatus to emphasize to carry out light-to-current inversion by illumination light, and from B pixel 60b, G pixel 60g, R image 60r successively output blue signal Bv, green Gv, danger signal Rv.
Like this, in 3 frame intervals, form 1 cycle, generate the image of 3 kinds.Be set to special display mode during in repeat this 1 cycle.In addition, blue signal Bc, the green Gc, the danger signal Rc that when irradiating broadband light BB, obtain are converted and are transformed into blue image data Bc, green image data Gc, red image data Rc by A/D.In addition, at blue signal Bm, the green Gm, the danger signal Rm that irradiate the light time acquisition of oxygen saturation mensuration, by A/D, convert and be transformed into blue image data Bm, green image data Gm, red image data Rm.In addition blue signal Bv, the green Gv, the danger signal Rv that when irradiation blood vessel is emphasized by illumination light, obtain, are converted and are transformed into blue image data Bv, green image data Gv, red image data Rv by A/D.
As above-mentioned, owing to obtaining because of the different view data of each pattern, so its image is processed also different respectively.As shown in Figure 9, image processing part 72 possesses: common image processing part 80 display mode for, and its view data based on getting when the common display mode is carried out image processing; With special image processing part 81 for display mode, its view data based on getting when the special display mode is carried out image processing.
Conventionally display mode with image processing part 80 the blue image data Bc based on obtaining when the common display mode, the common image that green image data Gc, red image data Rc make the full color consisting of blue image, green image, red image.Among the common image being made into, blue image is assigned to the B passage of display device 14, and green image is assigned to the G passage of display device 14, and red image is assigned to the R passage of display device 14.
Special display mode possesses with image processing part 81 that common image is made portion 84, oxygen saturation image makes portion 86 and arrowband image is made portion 87.Conventionally image is made the blue image data Bc of portion 84 based on obtaining when the special display mode, the common image that green image data Gc, red image data Rc make the full color consisting of blue image, green image, red image.The blue image of the common image being made into, green image, red image are assigned to respectively B, G, the R passage of display device.
Oxygen saturation image processing part 86 possesses strength ratio calculating part 86a, dependency relation storage part 86b, the 86c of oxygen saturation calculation portion and image production part 86d, the blue image data Bc obtaining when irradiating broadband light BB among the view data based on obtaining when the special display mode, green image data Gc, red image data Rc and measure the blue image data Bm that the light time obtains and make oxygen saturation image irradiating oxygen saturation.
Strength ratio calculating part 86a obtains strength ratio B/G between blue image data Bm and green image data Gc and the strength ratio R/G between red image data Rc and green image data Gc.In strength ratio calculating part 86a, calculate the strength ratio of asking in the pixel of same position between view data, and carry out calculating strength ratio for whole pixels of view data.These strength ratios B/G, R/G are used to not rely in the calculating of oxygen saturation of blood flow volume.In addition, also can only utilize the pixel of vasculature part among view data to obtain strength ratio.In this case, to be view data based on vasculature part definite with the difference of the view data of part in addition for vasculature part.
As more than, use green image data Gc and by blue image data Bm and red image data Rc is standardized the reasons are as follows described in.The light quantity that the pixel value of blue image data Bm is measured reflection of light light according to oxygen saturation changes, but this oxygen saturation is measured the impact of difference that the light quantity of reflection of light light is not only subject to the oxygen condition of blood vessel, be also subject to representing the impact of variation etc. of the viewing distance of the distance between observer leading section 19 and subject tissue.Therefore, be difficult to utilize separately blue image data Bm correctly to calculate oxygen saturation.
Therefore, when calculating oxygen saturation, the view data of also using the variation of the endoceliac lightness that green image data Gc causes as the variation for to because of viewing distance etc. to carry out reference except blue image data Bm.About these 2 blue image data Bm and green image data Gc, when dimmed in body cavity, pixel value all reduces, and while brightening in body cavity on the contrary, pixel value all increases.Therefore, even if carrying out the ratio of the strength ratio B/G after standardization divided by green image data Gc, blue image data Bm can not change in the situation that endoceliac lightness has occurred to change yet.That is, can correctly calculate oxygen saturation according to strength ratio B/G.
In addition, because strength ratio B/G can not be subject to the impact of endoceliac lightness, even if the light quantity that therefore oxygen saturation is measured light when distant view is observed etc. deficiency slightly also can correctly be calculated oxygen saturation.Therefore, as above-mentioned, the irradiation time T2 that measures light due to oxygen saturation emphasizes the irradiation time T3 short (with reference to Fig. 3, Fig. 8 B) by illumination light than blood vessel, although thereby oxygen saturation to measure the light quantity of light easily not enough, by calculate oxygen saturation based on strength ratio B/G, computational accuracy can be guaranteed for necessarily.
In addition, red image data Rc has the information of blood flow volume, by combining to calculate with blue image data Bm the oxygen saturation that does not rely on blood flow volume.This red image data Rc is also not only subject to the impact of blood flow volume, also be subject to the impact of the variation of the endoceliac lightness that variation because of viewing distance etc. causes, therefore with blue image data Bm similarly, in order to remove the impact of endoceliac lightness, utilize green image data Gc to carry out standardization.
Dependency relation storage part 86b has stored the dependency relation between strength ratio B/G and R/G and oxygen saturation.This dependency relation is stored to have defined the isocontour bivariate table of oxygen saturation on two-dimensional space as shown in Figure 10.This isocontour position, shape are defined by obtaining according to the simulation physically of light scattering, according to blood flow volume, change.In addition, strength ratio B/G, R/G utilize log scale to represent.
Above-mentioned dependency relation is associated nearly with HbO2 Oxyhemoglobin Hb02, the extinction characteristic of reduced hemoglobin Hb, light scattering characteristic as shown in Figure 5.For example, in the larger wavelength of the difference of specific absorbance as 473nm, be easy to obtain the information of oxygen saturation.Yet, comprising that the blue image data Bm of the signal corresponding with the light of 473nm not only depends on oxygen saturation, the degree that depends on blood flow volume is also high.Therefore, except blue image data Bm, also by using strength ratio B/G and the R/G obtaining according to the green image data Gc that mainly depends on red image data Rc that blood flow volume changes, becomes the reference picture (standardization view data) of blue image data Bm and red image data Rc, thereby do not rely on blood flow volume, can correctly obtain oxygen saturation.
In addition, the light of the wave-length coverage of 470～700nm has the character that scattering coefficient is little and wavelength dependency is little in mucosal tissue.Thereby, by by the light of this wave-length coverage as illumination light, thereby the impact that can obtain the degree of depth that has reduced blood vessel comprises the blood information of the information of blood flow volume and oxygen saturation simultaneously.
In addition, also can in dependency relation storage part 86b, also store the dependency relation between strength ratio R/G and blood flow volume.This dependency relation is stored as being defined by the one dimension table that the larger blood flow volume of strength ratio R/G also becomes larger.When the dependency relation between this strength ratio R/G and blood flow volume is used to the calculating of blood flow volume.
The 86c of oxygen saturation calculation portion is used the dependency relation of storing in dependency relation storage part 86b and strength ratio B/G, the R/G being obtained by strength ratio calculating part 86a, obtains the oxygen saturation in each pixel.In addition, in the following description, the brightness value of the determined pixel of the blue image data Bm using, green image data Gc, red image data Rc is made as respectively to B*, G*, R* in the calculating of oxygen saturation.Follow in this, the strength ratio in each pixel becomes B*/G*, R*/G*.
As shown in figure 11, the 86c of oxygen saturation calculation portion determines the corresponding point P corresponding with strength ratio B*/G*, R*/G* according to the dependency relation of storing in dependency relation storage part 86b.And, in the situation that between the equal pitch contour 88 and the equal pitch contour 89 of oxygen saturation=100% boundary of corresponding point P in oxygen saturation=0% boundary, the represented percent value of these corresponding point P is made as to oxygen saturation.For example, if the situation of Figure 11, because corresponding point P is positioned on 60% equal pitch contour, so oxygen saturation becomes 60%.
On the other hand, in the situation that corresponding point depart between equal pitch contour 88 and equal pitch contour 89, when corresponding point are positioned at top than equal pitch contour 88, oxygen saturation is made as to 0%, when corresponding point are positioned at below than equal pitch contour 89, oxygen saturation is made as to 100%.In addition, also can be in the situation that corresponding point depart from asking of equal pitch contour 88 and equal pitch contour 89, reduce the reliability of the oxygen saturation in this pixel and be not presented in display device 14.
As shown in figure 12, in the situation that oxygen saturation is more than 60% high oxygen condition, pixel value b, g, r are all applied to identical gain " 1 ".With respect to this, in the situation that oxygen saturation, lower than 60% hypoxia, applies the gain lower than " 1 " to pixel value r, and pixel value b, g are applied to the gain that surpasses " 1 ".The image that this common image is applied after gaining with oxygen saturation is corresponding becomes oxygen saturation image.Pixel value b among this oxygen saturation image is distributed to the B passage of display device 14, pixel value g is distributed to the G passage of display device 14, pixel value r is distributed to the R passage of display device 14.Thus, about oxygen saturation image, when high oxygen condition, with the color identical with common image, show and comprise that a corpse or other object for laboratory examination and chemical testing for blood vessel is whole, and the pseudo-colours with aeruginous tone shows vasculature part when hypoxia.
Arrowband image is made portion 87 by the blue image data Bv and the green image data Gv that obtain when irradiation blood vessel is emphasized by illumination light are synthesized to processing, makes superficial blood vessel and mid-deep strata blood vessel by the arrowband image after being emphasized to show.Blue image data Bv among this arrowband image is distributed to B, the G passage of display device 14, green image data Gv is distributed to the R passage of display device 14.Thus, in arrowband image, superficial blood vessel shows with " dark brown " tone, and mid-deep strata blood vessel shows with " aeruginous " tone.
Secondly, along the flow chart of Figure 13, a succession of flow process in present embodiment is described, especially about a succession of flow process of special display mode.Be placed under the state of common display mode, by endoscope apparatus 12 insertosomes, in for example digestive tract.Operation by angulation knob 16a makes observer leading section 19 and desired viewing area carry out matchingly the observation in body.In observation when this common display mode, convolutional filter 31 is placed at peristome 31a under the state in the light path of broadband light BB and stops.Thereby broadband light BB is exposed in a corpse or other object for laboratory examination and chemical testing by former state.Afterwards, utilize in 60 pairs of corpse or other object for laboratory examination and chemical testing of colored imaging apparatus and make a video recording, the common image of the full color obtaining by this shooting is shown in to display device 14.
And in the situation that viewing area is presumed to pathological changes portion, the change-over switch 21 by endoscope apparatus 12 switches to special display mode.By this pattern, switch the rotation that starts convolutional filter 31.Rotation by this convolutional filter 31 makes broadband light BB emphasize to see through successively by the order of the 31c of wave filter portion with the 31b of wave filter portion, blood vessel by the peristome 31a of convolutional filter 31, mensuration.Thus, at different moment ejaculation broadband light BB, oxygen saturation mensuration light, blood vessel, emphasize to use illumination light.During the irradiation of broadband light BB, ask that T1 is the shortest, second long be the irradiation time T2 that oxygen saturation is measured light, the longest is asks T3 (T1 < T2 < T3) when blood vessel emphasizes with the irradiation of illumination light.Emitted light is exposed to a corpse or other object for laboratory examination and chemical testing successively, by colored imaging apparatus 60, successively this corpse or other object for laboratory examination and chemical testing is made a video recording.
Then, among the view data based on obtaining by making a video recording, blue image data Bc, green image data Gc, red image data Rc make common image.In addition, calculate and utilize green image data Gc to carry out the strength ratio B/G after standardization blue image data Bm, and calculate and utilize green image data Gc to carry out the strength ratio R/G after standardization red image data Rc.Because utilizing green image data Gc to carry out standardization, strength ratio B/G, R/G obtain the impact of the variation of the lightness in the corpse or other object for laboratory examination and chemical testing that therefore can not be subject to causing because of the variation of viewing distance etc.And the dependency relation based on strength ratio B/G, R/G and Figure 10 is made the oxygen saturation image after the oxygen condition image conversion that makes blood vessel.In addition, based on blue image data Bv and green image data Gv, make the arrowband image after superficial blood vessel and mid-deep strata blood vessel are emphasized.3 images of these common images, oxygen saturation image, arrowband image are shown by transversely arranged as shown in Figure 14 simultaneously.As long as continue the 1st special display mode, just repeatedly carry out above a succession of action.In addition, except common image, arrowband image, oxygen saturation image show as shown in Figure 14 simultaneously, can also respectively show at regular intervals 1 image.
In above-mentioned the 1st embodiment, by emphasizing the area S2 with the 31c of wave filter portion by measuring with the 31b of wave filter portion and blood vessel, S3 establishes to such an extent that be greater than the area S1 of peristome 31a, and utilize green image data Gc to carry out standardization the blue image data Bm that comprises the information of oxygen saturation, obtained to high image quality thus common image, oxygen saturation image, arrowband image, but in the 2nd embodiment, except above-mentioned situation, also when the opening degree of aperture 30b being established to such an extent that be greater than common display mode when the special display mode so that expose to the light quantity of the light in a corpse or other object for laboratory examination and chemical testing and increase, obtain thus the image of brighter and high image quality.
In the 2nd embodiment, with the convolutional filter 100 shown in Figure 15, replace convolutional filter 31.In convolutional filter 100, along circumferencial direction, be provided with the mensuration same with convolutional filter 31 and emphasize with the 31c of wave filter portion with the 31b of wave filter portion and blood vessel, in part in addition, be provided with peristome 100a and the ND wave filter 100b of portion (being labeled as " ND " in Figure 15).Peristome 100a sees through broadband light BB former state, and the ND wave filter 100b of portion reduces the light quantity of broadband light BB.In addition, since in addition identical with the 1st embodiment, so the part different from the 1st embodiment carried out to following explanation.
When common display mode, under the state in the light path that peristome 100a is placed in to broadband light BB, convolutional filter 100 is stopped.Shooting in viewing area during this common display mode and the 1st embodiment same (with reference to figure SA).On the other hand, when special display mode, when the opening degree of aperture 30b is established to such an extent that be greater than common display mode.The broadband light BB of the high light quantity that thus, light quantity has increased is incident to convolutional filter 100.Afterwards, by making convolutional filter 100 rotations, from peristome 100a, penetrate thus the broadband light BB of high light quantity, the broadband light BB of the common light quantity the light quantity that penetrates the broadband light BB of high light quantity from the ND wave filter 100b of portion reduces (light quantity identical broadband light BB) during with common display mode, from measuring with the 31b of wave filter portion, penetrate oxygen saturation mensuration light, from blood vessel, emphasize that with the 31c of wave filter portion, penetrating blood vessel emphasizes to use illumination light.Thus, the light of 4 kinds is exposed to viewing area successively.
At this, the area S11 minimum (S10 and S11 are roughly the same) of the area S10 of peristome 100a and the ND wave filter 100b of portion, that second largest is the area S2 measuring with the 31b of wave filter portion, maximum is that blood vessel is emphasized the area S3 (S10 ≈ S11 < S2 < S3) with the 31c of wave filter portion, therefore the irradiation time T11 of the broadband light BB of the irradiation time T10 of the broadband light of high light quantity and common light quantity is the shortest, second long be the irradiation time T2 that oxygen saturation is measured light, the longest is that blood vessel is emphasized the irradiation time T3 (T10 ≈ T11 < T2 < T3) by illumination light.
And, according to the order shown in Figure 16, carry out endoceliac shooting.In the process of broadband light BB of irradiating high light quantity, do not carry out the light-to-current inversion of the broadband light BB of high light quantity.Afterwards, irradiation at the broadband light BB of high light quantity finishes, when the irradiation of the broadband light BB of light quantity starts conventionally, in the irradiation time T11 of the common broadband light BB of light quantity, the broadband light BB of common light quantity is carried out to light-to-current inversion, from B pixel 60b, G pixel 60g, R pixel 60r output blue signal Bc, green Gc, danger signal Rc.Based on these blue signals Bc, green Gc, danger signal Rc, make common image.Afterwards, when the irradiation of the broadband light BB of light quantity finishes conventionally, start the irradiation that oxygen saturation is measured light.Oxygen saturation is measured irradiation time T2 and subsequent the blood vessel of light and is emphasized shooting and the 1st embodiment same (with reference to Fig. 8 B) with the corpse or other object for laboratory examination and chemical testing in the irradiation time T3 of illumination light, in addition, oxygen saturation image and arrowband image make also same with the 1st embodiment.
As more than, owing to not being that broadband light BB based on high light quantity makes common image, but the broadband light BB of common light quantity based on by after ND wave filter 100b dim light makes common image, the generation of the halation (phenomenon that pixel value becomes high) therefore occurring when receiving the reflected light of high light quantity can be suppressed.On the other hand, because the broadband light BB of high light quantity is incident to, measure with the 31b of wave filter portion, so the light quantity that oxygen saturation is measured light becomes large.Like this, by using the oxygen saturation after light quantity becomes greatly to measure light, S/N further improves thus, so the computational accuracy of oxygen saturation is promoted.In addition because the broadband light BB of high light quantity is also incident to blood vessel, emphasize with the 31c of wave filter portion, so blood vessel is emphasized also to become large by the light quantity of illumination light.Like this, the blood vessel after becoming greatly based on light quantity emphasizes that the arrowband image of making by illumination light becomes bright on the whole.
In addition, in the above-described embodiment, color filter as color image sensor, although use the wave filter of the former colour system of B, G, R, but except thering is the color filter of the complementary color spectrophotometric transmittance shown in Figure 17, Y (yellow), M (magenta), C (aeruginous) system, can also use the colored imaging apparatus (color image sensor of CMYG) of the color filter that is provided with G (green).In the situation that utilize the color image sensor of this CMYG to make a video recording, from be provided with Y color color filter the output of Y pixel Y-signal, from be provided with M color color filter the output of M pixel M signal, from being provided with the C signal of C pixel output of the color filter of C color, by RGB, convert R signal, G signal, the B signal that is transformed into primary colors.Afterwards, R signal and B signal and from being provided with the G signal of G pixel output of the color filter of G color among the signal based on after RGB conversion, carry out making of common image, oxygen saturation image, arrowband image.
In addition, in the above-described embodiment, by blue image data Bm divided by green image data Gc carry out standardization (or red image data Rc is carried out to standardization divided by green image data Gc), for standardized view data, can be also the data beyond green image data Gc.For example, except the blue image data Bc, the red image data Rc that obtain when to corpse or other object for laboratory examination and chemical testing internal radiation broadband light BB, can also be by the blue image data Bv obtaining when irradiation blood vessel is emphasized by illumination light, green image data Gv, red image data Rv for standardization.
In addition, in the above-described embodiment, although blood vessel is emphasized to be greater than with the area S3 of the 31c of wave filter portion the area S2 measuring with the 31b of wave filter portion, these 2 area S3, S2 also can be roughly the same.In addition, also can be by establishing to such an extent that be greater than the area S1 (or area S11 of ND wave filter 100b) of peristome by measuring area S2 with the 31b of wave filter portion, in the situation that the light quantity of oxygen saturation mensuration light reaches in order to measure the required sufficient light quantity of oxygen condition of blood vessel, do not utilize green image data Gc to carry out standardization and just can carry out making of oxygen saturation image thus.In this case, do not carry out the calculating of oxygen saturation and carry out image and make.For example, by blue image data Bm being distributed to B, the G passage of display device 14, green image data Gc is distributed to the R passage of display device 14, thereby follow the reduction of oxygen saturation and oxygen saturation image that the color of superficial blood vessel gradually changes from " dark brown " tone is shown in display device 14.
In addition, in the above-described embodiment, among oxygen saturation image, only the blood vessel of hypoxia is carried out to pseudo-colours demonstration, but also can be to comprising that the corpse or other object for laboratory examination and chemical testing integral body of the blood vessel of hypoxia carries out pseudo-colours demonstration.In this case, the color that preferably predetermines pseudo-colours according to the oxygen condition of blood vessel (for example, the blood vessel that shows hyperoxia with " redness ", correspondingly the color of blood vessel is partial to " light blue " gradually with the reduction of oxygen saturation, with " blueness ", shows that oxygen saturation is lower than the blood vessel of 60% such hypoxia).
In addition, in the above-described embodiment, although based on according to carrying out the calculating of oxygen saturation with the corresponding view data of 3 wavelength (blue image data Bm, green image data Gc, red image data Rc) strength ratio B/G, the R/G obtaining, replace and also can only utilize according to carrying out the calculating of oxygen saturation with the corresponding view data of 2 wavelength (blue image data Bm, green image data Gc) the strength ratio B/G obtaining.
In addition, in the above-described embodiment, although according to convolutional filter respectively see through the area that the bandwidth that sees through wave band in region decides wave filter (area of the widest peristome of bandwidth, ND wave filter portion is established to such an extent that be less than its narrow mensuration of bandwidth ratio and emphasize the area with wave filter portion with wave filter portion and blood vessel), replace and also can carry out and respectively through the corresponding AE of bandwidth (auto-exposure control) through wave band in region.
For example, in the time of on broadband light BB is incident to through the peristome of the broader bandwidth of wave band or ND wave filter, reduces the opening degree of aperture, and shorten the electric charge savings time of imaging apparatus.On the other hand, at broadband light BB, be incident to through the mensuration of the narrow bandwidth of wave band and with wave filter portion and blood vessel, emphasize with in wave filter portion time, to increase the opening degree of aperture, and extend the electric charge savings time of imaging apparatus.As more than, by carrying out and see through the corresponding AE of bandwidth of wave band, thereby the broadband light that imaging apparatus can be accepted, oxygen saturation are measured light, blood vessel is emphasized to be adjusted into roughly even with the light income of illumination light.Thus, the lightness of image, oxygen saturation image, arrowband image becomes roughly the same conventionally.
In addition, in the above-described embodiment, although the shared ratio of HbO2 Oxyhemoglobin is that oxygen saturation generates oxygen saturation image among use blood flow volume (HbO2 Oxyhemoglobin and reduced hemoglobin sum), also can replaces or use on this basis the HbO2 Oxyhemoglobin index of obtaining according to " blood flow volume * oxygen saturation (%) ", the reduced hemoglobin index that basis " blood flow volume * (100-oxygen saturation) (%) " is obtained.
Claims (12)
1. an endoscopic system, is characterized in that, possesses:
Wideband light source, produces broadband light;
Convolutional filter, have the 1st and see through region and the 3rd through region through region, the 2nd, the described the 1st sees through the light transmission that region makes the 1st wave band among described broadband light, the described the 2nd sees through the light transmission that region makes 2nd wave band different with the specific absorbance of reduced hemoglobin of the specific absorbance of HbO2 Oxyhemoglobin among described broadband light, the described the 3rd sees through the light transmission that region makes the 3rd wave band that the specific absorbance of hemoglobin is high among described broadband light, and the described the 1st to the 3rd area that sees through region decides according to described the 1st bandwidth to the 3rd wave band;
Endoscope apparatus, irradiates the 1st light to the 3rd wave band that has seen through described convolutional filter successively to a corpse or other object for laboratory examination and chemical testing, thereby and by colored imaging apparatus, a described corpse or other object for laboratory examination and chemical testing is made a video recording successively and obtained the 1st to the 3rd image information;
Conventionally image is made parts, according to described the 1st image information, makes common image;
Oxygen saturation image is made parts, according to described the 2nd image information, makes the oxygen saturation image that the oxygen saturation image conversion of blood hemoglobin is obtained; With
Arrowband image is made parts, according to described the 3rd image information, makes arrowband image.
2. endoscopic system according to claim 1, is characterized in that,
Described the 1st wave band has than the described the 2nd and the bandwidth of the 3rd wide waveband,
The the described the 2nd and the 3rd area that sees through region is greater than the described the 1st area through region.
3. endoscopic system according to claim 2, is characterized in that,
The described the 1st is the open area that described broadband light former state is seen through through region.
4. according to the endoscopic system described in any one in claims 1 to 3, it is characterized in that,
Described oxygen saturation image is made the standardized images information that parts obtain based on the specific image information among described the 2nd image information with the information of described oxygen saturation being utilized the image information beyond described specific image information among described the 1st to the 3rd image information carry out standardization, makes described oxygen saturation image.
5. endoscopic system according to claim 1, is characterized in that,
Described wideband light source can be the 1st light value and 2nd light value larger than the 1st light value by light quantity setting,
Described convolutional filter sees through and region, also to have the 4th and see through region except the described the 1st to the 3rd, and the described the 4th sees through region makes among described broadband light bandwidth constant and only make the light quantity after light quantity reduces reduce light transmission,
Described endoscope apparatus, when the light quantity setting of described broadband light is described the 2nd light value, replace described the 1st image information and obtain the 4th image information, described the 4th image information is made a video recording and is obtained the described corpse or other object for laboratory examination and chemical testing after utilizing described light quantity reduction light illuminated
Described common image is made parts, when the light quantity setting of described broadband light is described the 2nd light value, replaces described the 1st image information and makes described common image based on described the 4th image information.
6. endoscopic system according to claim 5, is characterized in that,
Described the 4th wave band has than the described the 2nd and the bandwidth of the 3rd wide waveband,
The the described the 2nd and the 3rd area that sees through region is greater than the described the 4th area through region.
7. according to the endoscopic system described in claim 5 or 6, it is characterized in that,
Described oxygen saturation image is made the standardized images information that parts obtain based on the specific image information among described the 2nd image information with the information of described oxygen saturation being utilized the image information beyond described specific image information among described the 2nd to the 4th image information carry out standardization, makes described oxygen saturation image.
8. according to the endoscopic system described in any one in claim 1 to 7, it is characterized in that,
Described the 2nd wave band is 450～500nm, and described the 3rd wave band is 405～425nm and 530～550nm.
9. a light source device for endoscope, is characterized in that, possesses:
Wideband light source, produces broadband light; With
Convolutional filter, have the 1st and see through region and the 3rd through region through region, the 2nd, the described the 1st sees through the light transmission that region makes the 1st wave band among described broadband light, the described the 2nd sees through the light transmission that region makes 2nd wave band different with the specific absorbance of reduced hemoglobin of the specific absorbance of HbO2 Oxyhemoglobin among described broadband light, the described the 3rd sees through the light transmission that region makes the 3rd wave band that the specific absorbance of hemoglobin is high among described broadband light, the described the 1st to the 3rd area that sees through region decides according to described the 1st bandwidth to the 3rd wave band
The 1st light to the 3rd wave band that has seen through described convolutional filter is supplied to endoscope apparatus.
10. light source device for endoscope according to claim 9, is characterized in that,
Described the 1st wave band has the bandwidth in broadband, and the described the 2nd and the 3rd wave band has the bandwidth of arrowband,
The the described the 2nd and the 3rd area that sees through region is greater than the described the 1st area through region.
11. light source device for endoscopes according to claim 9, is characterized in that,
Described convolutional filter sees through and region, also to have the 4th and see through region except the described the 1st to the 3rd, and the described the 4th sees through region makes among described broadband light bandwidth constant and only make the light quantity after light quantity reduces reduce light transmission.
The method for making of 12. 1 kinds of endoscopic images, is characterized in that,
By wideband light source, produce broadband light;
Make described broadband light be incident to convolutional filter, described convolutional filter has the 1st and sees through region, the 2nd sees through region and the 3rd sees through region, the described the 1st sees through the light transmission that region makes the 1st wave band among described broadband light, the described the 2nd sees through the light transmission that region makes 2nd wave band different with the specific absorbance of reduced hemoglobin of the specific absorbance of HbO2 Oxyhemoglobin among described broadband light, the described the 3rd sees through the light transmission that region makes the 3rd wave band that the specific absorbance of hemoglobin is high among described broadband light, the described the 1st to the 3rd area that sees through region decides according to described the 1st bandwidth to the 3rd wave band,
To a corpse or other object for laboratory examination and chemical testing, irradiate successively the 1st light to the 3rd wave band that has seen through described convolutional filter, thereby and by colored imaging apparatus, a described corpse or other object for laboratory examination and chemical testing is made a video recording successively and obtained the 1st to the 3rd image information;
According to described the 1st image information, make common image;
According to described the 2nd image information, make the oxygen saturation image that the oxygen saturation image conversion of blood hemoglobin is obtained;
According to described the 3rd image information, make arrowband image.
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