WO2013051431A1 - 蛍光観察装置 - Google Patents
蛍光観察装置 Download PDFInfo
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- WO2013051431A1 WO2013051431A1 PCT/JP2012/074560 JP2012074560W WO2013051431A1 WO 2013051431 A1 WO2013051431 A1 WO 2013051431A1 JP 2012074560 W JP2012074560 W JP 2012074560W WO 2013051431 A1 WO2013051431 A1 WO 2013051431A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/043—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances for fluorescence imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/02042—Determining blood loss or bleeding, e.g. during a surgical procedure
Definitions
- the present invention relates to a fluorescence observation apparatus.
- Patent Document 1 describes an endoscope apparatus or an endoscope observation system used for such an endoscopic surgical operation.
- the present invention has been made in view of such circumstances, and grasps a region of a desired tissue such as a lesion or blood vessel in an acquired image even when bleeding occurs during an operation.
- An object of the present invention is to provide a fluorescence observation apparatus that can perform the above-described process.
- One aspect of the present invention includes a light source that irradiates a subject with excitation light and reference light, and a fluorescence image generation unit that captures fluorescence generated in the subject by irradiation of the excitation light from the light source and generates a fluorescence image.
- a reference image generation unit that captures the return light that is returned from the subject by irradiation of the reference light from the light source and generates a reference image, and of the reference images, the luminance of the fluorescent image is not less than a first threshold value.
- a corrected image generating unit that generates a corrected image corrected so as to emphasize a pixel corresponding to the pixel, an image display unit that displays the reference image or the corrected image, and a bleeding region of the subject based on the reference image
- a bleeding state determination unit that detects whether or not the bleeding region exceeds a predetermined range, and the reference image when the bleeding state determination unit determines that the bleeding region does not exceed the predetermined range
- the Provided is a fluorescence observation apparatus comprising: a display image switching unit that displays on the image display unit and switches the correction image to be displayed on the image display unit when it is determined that the bleeding region exceeds a predetermined range To do.
- the fluorescence image generation unit when the subject is irradiated with the excitation light emitted from the light source, the fluorescence image generation unit generates a fluorescence image based on the fluorescence generated in the subject, and the reference light emitted from the light source is received by the subject.
- a reference image based on the return light is generated by the reference image generation unit.
- the corrected image generator generates a pixel having a luminance higher than or equal to the first threshold value in the fluorescent image, that is, a pixel having a high luminance due to strong fluorescence emitted from a lesioned part of the subject with respect to the reference image.
- a corrected image in which the pixels of the corresponding reference image are emphasized is generated.
- the bleeding state determination unit determines whether or not the bleeding region of the subject exceeds a predetermined range based on the reference image. As a result, when it is determined that the bleeding region does not exceed the predetermined range, the reference image is displayed on the image display unit, and when it is determined that the bleeding region exceeds the predetermined range, a correction image is displayed. Is done.
- an observer such as a doctor performs treatment while observing the reference image displayed on the image display unit when the bleeding region does not exceed the predetermined range, and bleeding occurs in the course of the treatment.
- the corrected image displayed on the image display unit is observed instead of the reference image.
- a corrected image in which a pixel having a luminance equal to or higher than the first threshold in the fluorescent image, that is, a lesion where the fluorescent substance is specifically accumulated is emphasized is displayed on the image display unit. Even when a tissue such as a lesioned part or a blood vessel is covered with blood, it is possible to grasp the region of the lesioned part or the like.
- the correction image generation unit is a bleeding region detected by the bleeding state determination unit in the reference image, and a pixel having a luminance value equal to or higher than a first threshold in the fluorescent image. It is preferable to generate a corrected image corrected so as to emphasize the corresponding pixel.
- the bleeding detected by the bleeding state determination unit in the reference image By generating a corrected image in which a pixel corresponding to a pixel having a luminance value equal to or higher than the first threshold value in the fluorescent image is emphasized, a lesioned part is reduced while reducing the time and amount of calculation required for processing or calculation. And a desired tissue region such as a blood vessel can be grasped.
- the corrected image generation unit is configured to output a first threshold value in the fluorescent image with respect to a predetermined color signal of a pixel corresponding to a pixel having a luminance equal to or higher than the first threshold value in the fluorescent image. It is preferable to generate a corrected image by adding signal values based on the luminance of the pixels having the above luminance.
- the corrected image generation unit generates a corrected image by performing color conversion processing on a pixel corresponding to a pixel having a luminance value equal to or higher than a first threshold in the fluorescent image in the reference image. It is preferable.
- the corrected image generation unit generates a divided image obtained by dividing the fluorescent image by the R signal of the reference image, and among the reference images, a pixel having a luminance equal to or higher than a second threshold value in the divided image; It is preferable to generate a corrected image corrected so as to emphasize the corresponding pixel.
- a divided image is generated that takes into account that the bleeding region is red and reduces the change in fluorescent intensity depending on the observation distance and the observation angle.
- a corrected image is generated by emphasizing a pixel corresponding to a pixel having a luminance equal to or higher than the second threshold in the divided image with respect to the reference image, so that a region of a desired tissue such as a lesion or blood vessel can be grasped more accurately. can do.
- the correction image generation unit corresponds to a pixel having a luminance value that is a bleeding region detected by the bleeding state determination unit in the reference image and is equal to or higher than a second threshold value in the divided image. It is preferable to generate a corrected image that is corrected so as to emphasize the pixels to be corrected.
- the bleeding detected by the bleeding state determination unit in the reference image By generating a corrected image in which a pixel corresponding to a pixel having a luminance value equal to or greater than the second threshold in the divided image is emphasized, the time and amount of calculation required for processing or calculation can be reduced. And a desired tissue region such as a blood vessel can be grasped.
- the corrected image generation unit performs the second threshold value in the divided image with respect to a predetermined color signal of a pixel corresponding to a pixel having a luminance equal to or higher than the second threshold value in the divided image in the reference image. It is preferable to generate a corrected image by adding signal values based on the luminance of the pixels having the above luminance.
- the corrected image generation unit generates a corrected image by performing color conversion processing on a pixel corresponding to a pixel having a luminance value equal to or higher than a second threshold in the divided image in the reference image. It is preferable.
- the bleeding region determination unit determines that the bleeding region does not exceed the predetermined range It is preferable to irradiate the excitation light.
- the bleeding region is determined to exceed the predetermined range, it is possible to prevent fading of the fluorescent dye by irradiating the excitation light. That is, in order to obtain a fluorescence image, it is necessary to administer a fluorescent agent to a subject in advance. However, if the excitation light is continuously irradiated during a long operation, the fluorescence from the fluorescent agent is faded. Therefore, by irradiating the excitation light as necessary, the fading of the fluorescent dye is prevented, and a high-quality fluorescent image is obtained. Understand the area of the organization.
- the bleeding state determination unit detects a bleeding region in a predetermined region including the vicinity of the center portion of the reference image, and determines whether or not the bleeding region exceeds a predetermined range.
- the surgeon acquires the reference image so that the treatment target site such as a lesioned part becomes the center of the display unit. Even when bleeding occurs, for example, the bleeding region may be irrelevant to the treatment and may be the end of the reference image. Therefore, by detecting a bleeding region in a predetermined region including the vicinity of the center of the reference image and determining whether or not the bleeding region exceeds a predetermined range, it is possible to reduce the time or amount of calculation required for processing or calculation. it can.
- the bleeding state determination unit detects a bleeding region by comparing the signal intensity with respect to the R signal of each pixel of the reference image and at least one of the G signal or the B signal of each pixel. Also good. By doing so, red, which is the color of blood, is effectively detected, so that the bleeding region can be accurately detected.
- a desired tissue region such as a lesion or blood vessel can be grasped in an acquired image even when bleeding occurs during an operation.
- FIG. 1 is a schematic configuration diagram of an endoscope apparatus according to a first embodiment of the present invention. It is explanatory drawing of the white light image and correction
- an endoscope apparatus 100 as a fluorescence observation apparatus includes an elongated scope 2 that is inserted into a body cavity and a light source 10 that emits illumination light emitted from the distal end 2a of the scope 2.
- An illumination unit 20 provided, an imaging unit 30 that acquires image information of a treatment target region X that is a subject disposed in the scope 2, an image processing unit 40 that processes image information acquired by the imaging unit 30, and an image A monitor (image display unit) 50 that displays an image processed by the processing unit 40, image information, and the like is provided.
- the light source 10 includes a xenon lamp (Xe lamp) 11 that emits illumination light, an excitation light filter 13 that extracts white light including excitation light from the illumination light emitted from the xenon lamp 11, and the excitation that is extracted by the excitation light filter 13. And a coupling lens 15 that collects white light including light.
- the excitation light filter 13 cuts out white light including excitation light having a wavelength band of 400 to 740 nm, for example.
- the illumination unit 20 includes a light guide fiber 21 disposed over substantially the entire length of the scope 2 in the longitudinal direction, and a diffusion lens 23 disposed at the distal end 2 a of the scope 2.
- the light guide fiber 21 guides white light including excitation light collected by the coupling lens 15 to the distal end 2 a of the scope 2.
- the diffusion lens 23 diffuses white light including excitation light guided by the light guide fiber 21 to irradiate the treatment target site X.
- the imaging unit 30 collects return light returning from the treatment target site X irradiated with white light including excitation light by the illumination unit 20, and the return light collected by the objective lens 31 for each wavelength.
- the objective lens 31 is disposed in parallel with the diffusion lens 23 at the distal end 2 a of the scope 2.
- the beam splitter 33 reflects light (excitation light and fluorescence) of the return light that is longer than the excitation wavelength, and transmits white light (return light) having a wavelength shorter than the excitation wavelength.
- the imaging unit 30 includes an excitation light cut filter 35 that blocks excitation light and transmits only fluorescence (for example, near infrared fluorescence) out of excitation light and fluorescence reflected by the beam splitter 33, and excitation.
- a condensing lens 37A that condenses the fluorescence that has passed through the light cut filter 35
- a condensing lens 37B that condenses the white light that has passed through the beam splitter 33
- a fluorescent photographing that photographs the fluorescence that has been condensed by the condensing lens 37A.
- a white light photographing unit 39 that photographs white light collected by the unit 38 and the condenser lens 37B.
- the excitation light cut filter 35 transmits only fluorescence having a wavelength band of 765 to 850 nm, for example.
- the fluorescence imaging unit 38 is, for example, a fluorescent high-sensitivity monochrome CCD, and the fluorescence imaging unit 38 acquires fluorescence image information by imaging fluorescence.
- the white light photographing unit 39 is a color CCD for white light, for example, and includes a mosaic filter (not shown). The white light photographing unit 39 obtains white light image information by photographing white light.
- the image processing unit 40 is generated by a fluorescent image generation unit 41 that generates a fluorescent image, a white light image generation unit (reference image generation unit) 42 that generates a white light image (reference image), and a white light image generation unit 42.
- a corrected image generation unit 43 that corrects the white light image thus generated to generate a corrected image
- a bleeding state determination unit 44 that determines the bleeding state of the treatment target site X based on the white light image
- a bleeding state determination unit 44 A display image switching unit 45 that switches an image to be displayed on the monitor 50 based on the determination result.
- the fluorescence image generation unit 41 generates a two-dimensional fluorescence image from the fluorescence image information acquired by the fluorescence imaging unit 38, and outputs the generated fluorescence image to the correction image generation unit 43.
- the white light image generation unit 42 generates a two-dimensional white light image from the white light image information acquired by the white light photographing unit 39, and the generated white light image is used as a correction image generation unit 43 and a bleeding state determination unit 44. And output to the display image switching unit 45.
- 2A shows an example of a white light image of the treatment target site X
- FIG. 2B shows an example of a white light image when the treatment target site X bleeds.
- the corrected image generating unit 43 generates a corrected image that is corrected so as to emphasize pixels corresponding to pixels having a luminance equal to or higher than the first threshold in the fluorescent image in the white light image. That is, a corrected image is generated in which the pixels of the white light image corresponding to the pixels having high luminance due to strong fluorescence emitted from the lesioned part or the like in the treatment target site X are generated.
- An example of a corrected image is shown in FIG.
- the generation of the corrected image by the corrected image generation unit 43 is performed as follows.
- the corrected image generation unit 43 extracts a pixel having a luminance that is equal to or higher than the first threshold value from the fluorescent image compared to a first threshold value that is determined in advance for each pixel.
- An area made up of pixels corresponding to these pixels is defined as a correction target area.
- the signal value of each corresponding pixel in the fluorescent image (for example, a constant multiple of the luminance value) is added to the G channel of each pixel in the correction target region of the white light image, as in the following equation. .
- Og (i) Wg (i) + ⁇ F (i)
- ⁇ is a predetermined constant
- Or (i), Og (i), and Ob (i) are the signal intensities of the R, G, and B channels in the i-th pixel of the corrected image
- Wr (i), Wg (i), and Wb (i) are the signal intensities of the R, G, and B channels in the i-th pixel of the white light image
- F (i) is the signal in the i-th pixel of the fluorescent image. It is strength.
- the pixel is emphasized by adding a signal value based on the luminance of each corresponding pixel in the fluorescence image to a specific color signal (for example, G channel) of each pixel in the correction target region, that is, Then, a corrected image in which the correction target area is emphasized is generated.
- a specific color signal for example, G channel
- the bleeding state determination unit 44 detects a bleeding region of the treatment target site X based on the white light image input from the white light image generation unit 42, determines whether or not the bleeding region exceeds a predetermined range, and determines The result is output to the display image switching unit 45. Specifically, the bleeding state determination unit 44 extracts pixels in which the R channel signal value of each pixel exceeds a predetermined threshold A from all the pixels included in the white light image, and further extracts each pixel extracted. A pixel having a G channel signal value lower than the threshold value B with respect to the R channel signal value is determined as a bleeding pixel, and a region including the bleeding pixel is detected as a bleeding region.
- the detected bleeding region exceeds a predetermined range, that is, when the total number of bleeding pixels is larger than a predetermined threshold C, it is determined that the bleeding state is present because the bleeding region is large. Further, when it is determined that the bleeding region does not exceed the predetermined range, that is, when the total number of bleeding pixels is smaller than the threshold C, it is determined that the bleeding region is not in a bleeding state because the bleeding region is small.
- the display image switching unit 45 monitors the white light image when it is determined that the bleeding region does not exceed the predetermined range based on the determination result of the bleeding state determination unit 44, that is, when it is determined that the bleeding state is not a bleeding state. 50, and when it is determined that the bleeding region exceeds the predetermined range, that is, when it is determined that the bleeding state is a bleeding state, the correction image is switched to be displayed on the monitor 50.
- the treatment target site X bleeds when performing a desired treatment (surgery) on the treatment target site X in the body cavity using the endoscope apparatus 100 according to the present embodiment configured as described above.
- the flow of the determination of the bleeding state by the bleeding state determination unit 44 will be described with reference to the flowchart of FIG.
- the R channel signal value (hereinafter referred to as R signal) is compared with a predetermined threshold A in order from the first pixel, and if it is determined that the R signal is below the predetermined threshold A, If the pixel is not bleeding, the process proceeds to step S114, and the process proceeds to the determination of whether the pixel is a bleeding pixel for the next pixel. This is because since the blood is red, when the value of the R signal is small, it can be determined that the pixel is not bleeding because red is not detected. On the other hand, if it is determined that the R signal has exceeded the predetermined threshold A, the process proceeds to the next step S115 because there is a possibility that the pixel is bleeding.
- R signal the R channel signal value
- the value of the G channel signal value (hereinafter referred to as the G signal) with respect to the R signal of the pixel, that is, the G signal / R signal is compared with a predetermined threshold B, and the G signal / R signal is compared. If the threshold value B is exceeded, it is determined that the pixel is not bleeding, and the process proceeds to step S114, and the process proceeds to determination of whether or not the pixel is a bleeding pixel for the next pixel. On the other hand, when the G signal / R signal falls below the threshold value B, it is determined that the pixel is bleeding and the process proceeds to the next step S116.
- the G signal / R signal falls below the threshold value B, it is determined that the pixel is bleeding and the process proceeds to the next step S116.
- step S116 the pixels determined as bleeding pixels in step S115 are counted as the total number of bleeding pixels.
- step S117 whether or not it is a bleeding pixel has been determined for all the pixels of the white light image by comparing the total number of pixels of the white light image with the number of pixels for which the bleeding pixel has been determined. Judging. As a result of the determination, if it is determined that the bleeding pixel has not been determined for all the pixels, the process proceeds to step S114, and the process proceeds to determination of whether or not it is a bleeding pixel for the next pixel.
- step S118 the bleeding state in the treatment target region is determined by comparing the bleeding region in the treatment target region detected by calculating the total number of bleeding pixels in step S112 to step S117 with a predetermined threshold C. . That is, in step S118, the bleeding state determination unit 44 compares the total number of bleeding pixels (Cnt) counted so far with a predetermined threshold C, and if the total number of bleeding pixels exceeds the threshold C, the bleeding region is determined. Since it is larger, the process proceeds to step S119 and is determined to be in a bleeding state.
- step S120 If the total number of bleeding pixels is less than the threshold value C, the bleeding area is small, so the process proceeds to step S120 and it is determined that the bleeding state is not present.
- step S ⁇ b> 121 the determination result of either a bleeding state or no bleeding state is output to the display image switching unit 45.
- the flow in the case where a desired treatment (surgery) is performed on the treatment target site X in the body cavity using the endoscope apparatus 100 according to the present embodiment configured as described above is a flowchart of FIG. It explains according to.
- the fluorescent agent that specifically accumulates in a lesion such as a cancer cell is attached or absorbed to the treatment target site X
- image information of the treatment target site X is acquired (step S211). That is, by irradiating the treatment target site X with excitation light in a state where the fluorescent drug is attached or absorbed to the treatment target site X, the fluorescent drug is excited to generate fluorescence from the treatment target site X.
- the scope 2 is inserted into the body cavity with the fluorescent agent attached or absorbed to the treatment target site X, and the tip 2a is opposed to the treatment target site X.
- white light including excitation light emitted from the xenon lamp 11 by operating the light source 10 and cut out by the excitation light filter 13 is condensed by the coupling lens 15 and is collected by the light guide fiber 21 in the scope 2.
- Light is guided to the tip 2a. Then, the white light is diffused by the diffusion lens 23 and irradiated to the treatment target site X.
- the fluorescent substance contained therein is excited by excitation light to emit fluorescence, and white light and a part of the excitation light are reflected on the surface.
- the fluorescence, white light, and excitation light are collected by the objective lens 31, and light having an excitation wavelength or longer, that is, excitation light and fluorescence are reflected by the beam splitter 33, and white light having a wavelength shorter than the excitation wavelength is transmitted. .
- the excitation light and fluorescence reflected by the beam splitter 33 are removed by the excitation light cut filter 35, and only the fluorescence is collected by the condenser lens 37A and photographed by the fluorescence photographing unit 38. Thereby, fluorescence image information of the treatment target site X is acquired in the fluorescence imaging unit 38. Further, the white light transmitted through the beam splitter 33 is condensed by the condenser lens 37 ⁇ / b> B and photographed by the white light photographing unit 39. Thereby, the white light imaging unit 39 acquires the white light image information of the treatment target site X. Note that either the fluorescence image information or the white light image information may be acquired first or at the same time.
- the fluorescence image information acquired by the fluorescence imaging unit 38 and the white light image information acquired by the white light imaging unit 39 are converted into the fluorescence image generation unit 41 and the white light image generation unit of the image processing unit 40, respectively. 42.
- the fluorescence image generation unit 41 generates a two-dimensional fluorescence image based on the fluorescence image information, and the generated fluorescence image is output to the correction image generation unit 43.
- the white light image generation unit 42 generates a two-dimensional white light image based on the white light image information, and the generated white light image is converted into a corrected image generation unit 43, a bleeding state determination unit 44, and a display image switching. Is output to the unit 45.
- the corrected image generating unit 43 generates a corrected image.
- the corrected image generation unit 43 extracts a pixel having a luminance that is equal to or higher than the first threshold value from the fluorescent image compared to a first threshold value that is predetermined for each pixel, and among the white light image, the corrected image generation unit 43 equals or exceeds the first threshold value in the fluorescent image.
- a corrected image is generated by adding a constant multiple of the luminance value of each corresponding pixel in the fluorescence image to the G channel of the pixel corresponding to the pixel of the luminance of the display image, and the display image switching unit 45 generates the corrected image generated. Output to.
- step S214 the bleeding state determination unit 44 determines the bleeding state of the treatment target site X as described above, and outputs the determination result to the display image switching unit 45.
- step S215 the display image switching unit 45 switches the display image according to the determination result from the bleeding state determination unit 44. That is, in step S215, it is determined what the determination result of the bleeding state input to the display image switching unit 45 is. If the determination result that the bleeding state is not input is input, the process proceeds to step S217, and the bleeding state If the determination result is input, the process proceeds to step S216.
- step S217 since it is not a bleeding state, a white light image is displayed on the monitor 50, and the process returns to step S211 to acquire the next image information.
- step S216 since it is a bleeding state, a correction image is displayed on the monitor 50.
- the endoscope apparatus 100 when the bleeding region is detected and the bleeding region exceeds a predetermined range, it is determined that the treatment target site is in a bleeding state, By emphasizing pixels having a luminance equal to or higher than the first threshold in the white light image, a correction image highlighting a lesioned part or a tissue such as a blood vessel covered by bleeding is displayed on the monitor. Even if it occurs and a tissue such as a lesioned part or a blood vessel is covered with blood, a region of a desired tissue such as the lesioned part or a blood vessel can be grasped.
- excitation light and fluorescence it is desirable to select light having a wavelength that is difficult to be absorbed by blood (for example, near infrared light 700 nm to 1000 nm). Thereby, even when the tissue is covered with blood, most of the excitation light reaches the tissue containing the fluorescent agent, and much fluorescence generated in the tissue can reach the endoscope.
- a wavelength that is difficult to be absorbed by blood for example, near infrared light 700 nm to 1000 nm.
- the corrected image generation unit 43 uses the G signal of each pixel in the correction target area of the white light image as the signal value constant of each corresponding pixel in the fluorescent image.
- the present invention is not limited to such a configuration.
- the correction image generation unit 43 has a luminance that is equal to or higher than the first threshold value in the fluorescent image in the white light image.
- the corrected image may be generated by performing color conversion processing on the pixel corresponding to the value pixel.
- the corrected image generation unit 43 extracts a pixel having a luminance equal to or higher than the first threshold value from the fluorescent image in comparison with a first threshold value determined in advance for each pixel.
- An area composed of pixels corresponding to a pixel having a luminance of one threshold or more is defined as a correction target area. Then, for example, by multiplying the correction target region of the white light image by a color conversion matrix as described below, the correction target region that has turned red with blood is converted to green.
- Or (i), Og (i), and Ob (i) are the signal intensities of the R, G, and B channels in the i-th pixel of the corrected image
- Wr (i), Wg (i), Wb ( i) is the signal intensity of the R, G, and B channels in the i-th pixel of the white light image.
- the red color of the correction target area can be converted into another color, and the correction target area, that is, a lesioned part or blood vessel covered by bleeding, etc.
- the tissue can be easily grasped by displaying it in a color different from the color of bleeding.
- the correction target area is multiplied by the color conversion matrix, information regarding the brightness of the pixels included in the correction target area is maintained, and only the color can be changed.
- red in the correction target region is converted into green has been shown, but the present invention is not limited to this, and may be converted into, for example, blue.
- the corrected image generation unit 43 corrects the white light image so as to emphasize pixels corresponding to pixels having a luminance equal to or higher than the first threshold in the fluorescent image.
- the pixel corresponding to the pixel having the luminance equal to or higher than the second threshold in the divided image obtained by dividing the fluorescent image by the R signal of the white light image is emphasized.
- a corrected image corrected as described above is generated.
- the endoscope apparatus 200 includes a division image generation unit 46 that generates a division image in which the correction image generation unit 43 divides the fluorescence image by the white light image. Yes.
- the division image generation unit 46 generates a division image by dividing the fluorescence image input from the fluorescence image generation unit 41 by the R signal of the white light image input from the white light image generation unit 42.
- the corrected image generation unit 43 extracts a pixel having a luminance that is equal to or higher than the second threshold value from the divided image in comparison with a second threshold value that is predetermined for each pixel, and out of the white light image, the second threshold value or higher in the divided image.
- An area made up of pixels corresponding to the pixels having the brightness of is determined as a correction target area.
- the corrected image generation unit 43 uses the fluorescence image for the G channel of each pixel in the correction target area extracted based on the divided image.
- a corrected image is generated by adding the signal value of each corresponding pixel (for example, a constant multiple of the luminance value) or multiplying the correction target area by a color conversion matrix.
- a divided image is generated that takes into account that the bleeding region is red and reduces the change in fluorescence intensity depending on the observation distance and the observation angle.
- a corrected image is generated by emphasizing a pixel corresponding to a pixel having a luminance equal to or higher than the second threshold value in the divided image with respect to the white light image, a region of a desired tissue such as the lesion or blood vessel can be more accurately identified. I can grasp it.
- the bleeding state is determined over the entire treatment target site X, that is, the entire white light image.
- the bleeding state determination unit 44 determines the bleeding state for a predetermined region including the vicinity of the center portion of the white light image.
- the predetermined area for example, a central area excluding 1 ⁇ 4 from the top, bottom, left, and right of the display image is illustrated.
- FIG. 6 shows a flow when the bleeding state determination unit 44 determines the bleeding state for a predetermined region including the vicinity of the center portion of the white light image.
- the bleeding state determination unit 44 receives an input of the white light image generated by the white light image generation unit 42, and detects a predetermined bleeding determination region including the vicinity of the center in the next step S312. At the same time, edge detection in the bleeding determination area is performed. Forceps or the like as a treatment tool exist at a site to be treated such as a lesion, but the color or luminance in the white light image of the forceps is significantly different from that of a living tissue.
- step S312 edge detection is performed to divide the bleeding determination area into a biological tissue area and a non-biological tissue area.
- step S313 the average signal strength Rmv of the R signal of all the pixels in the living tissue region is calculated, and in the next step S314, the average signal strength Gmv of the G signal of all the pixels in the living tissue is calculated.
- step S315 the average signal strength Rmv (Gmv / Rmv) with respect to the average signal strength Gmv is compared with a predetermined threshold value Bmv. If Gmv / Rmv exceeds the threshold value Bmv, the pixel is not bleeding. In step S317, if Gmv / Rmv falls below the threshold value Bmv, it is determined that the pixel is bleeding, and the flow advances to next step S316.
- step S ⁇ b> 318 the determination result of either the bleeding state or the non-bleeding state is output to the display image switching unit 45.
- the calculation cost in image calculation can be reduced, and the delay of image display can be reduced.
- the light source control unit 52 receives a bleeding state determination result from the bleeding state determination unit 44, and outputs a command signal for irradiating the light source 10 with excitation light when the received determination result is a bleeding state. To do. In this way, it is possible to prevent fading of the fluorescent dye by irradiating the excitation light as necessary, so there is no possibility that the quality of the fluorescent image is deteriorated due to the fading and the lesion is accurately detected in the corrected image. A region of a desired tissue such as a part or a blood vessel can be grasped.
- an example of generating a corrected image in which all pixels corresponding to pixels having a predetermined luminance or higher in the fluorescent image of the white light image are emphasized when it is determined that the bleeding state is present is not limited to this.
- the image correction unit 43 is included in the region determined to be bleeding by the bleeding state determination unit 44, and It is also possible to generate a corrected image in which only a pixel corresponding to a lesion area, that is, a pixel having a predetermined luminance or higher in the fluorescent image of the white light image is emphasized.
- the endoscope apparatus has been described as an example.
- the present invention is not limited to this and may be applied to any other fluorescence observation apparatus.
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Abstract
Description
本発明の一態様は、被検体に励起光及び参照光を照射する光源と、該光源からの前記励起光の照射により前記被検体において発生した蛍光を撮影し蛍光画像を生成する蛍光画像生成部と、前記光源からの前記参照光の照射により前記被検体から戻る戻り光を撮影し参照画像を生成する参照画像生成部と、前記参照画像のうち、前記蛍光画像における第1閾値以上の輝度の画素と対応する画素を強調するように補正した補正画像を生成する補正画像生成部と、前記参照画像又は前記補正画像を表示する画像表示部と、前記参照画像に基づいて前記被検体の出血領域を検出し、該出血領域が所定の範囲を超えるか否かを判定する出血状態判定部と、該出状態判定部によって出血領域が所定の範囲を超えていないと判定された場合に前記参照画像を前記画像表示部に表示し、出血領域が所定の範囲を超えたと判定された場合に、前記補正画像を前記画像表示部に表示するように切り替える表示画像切替部と、を備える蛍光観察装置を提供する。
このようにすることで、血液の色である赤色を効果的に検出するので、正確に出血領域を検出することができる。
以下、本発明の第1の実施形態について、図面を参照して説明する。
本実施形態に係る蛍光観察装置としての内視鏡装置100は、図1に示すように、体腔内に挿入される細長いスコープ2と、スコープ2の先端2aから射出させる照明光を発する光源10を備える照明ユニット20と、スコープ2内に配置され被検体である処置対象部位Xの画像情報を取得する撮影ユニット30と、撮影ユニット30により取得された画像情報を処理する画像処理部40と、画像処理部40により処理された画像及び画像情報等を表示するモニタ(画像表示部)50とを備えている。
ライトガイドファイバ21は、カップリングレンズ15によって集光された励起光を含む白色光をスコープ2の先端2aまで導光するものである。拡散レンズ23は、ライトガイドファイバ21により導光された励起光を含む白色光を拡散させて処置対象部位Xに照射するようになっている。
対物レンズ31は、スコープ2の先端2aに拡散レンズ23と並列して配置されている。ビームスプリッタ33は、戻り光のうち、励起波長以上の光(励起光及び蛍光)を反射し、励起波長より波長が短い白色光(戻り光)を透過するようになっている。
白色光画像生成部42は、白色光撮影部39により取得された白色光画像情報から2次元的な白色光画像を生成し、生成した白色光画像を補正画像生成部43、出血状態判定部44及び表示画像切替部45に出力する。なお、図2(A)に処置対象部位Xの白色光画像の例を示し、図2(B)に、処置対象部位Xに出血した場合の白色光画像の例を示した。
そして、例えば、以下の数式のように、白色光画像の補正対象領域の各画素のGチャンネルに対して、蛍光画像における対応する各画素の信号値(例えば、輝度値の定数倍)を加算する。
Or(i)=Wr(i)
Ob(i)=Wb(i)
ここで、αは、予め定められた定数であって、Or(i),Og(i),Ob(i)は補正画像のi番目の画素におけるR,G,Bチャンネルの信号強度であり、Wr(i),Wg(i),Wb(i)は白色光画像のi番目の画素におけるR,G,Bチャンネルの信号強度であり、F(i)は蛍光画像のi番目の画素における信号強度である。
このように、補正対象領域の各画素の特定の色信号(例えば、Gチャンネル)に対して、蛍光画像における対応する各画素の輝度に基づく信号値を加算することにより当該画素を強調した、すなわち、補正対象領域を強調した補正画像を生成する。
まず、内視鏡装置100を用いて生体の体腔内の処置対象部位Xを手術する際に、癌細胞等の病変部に特異的に集積する蛍光薬剤を処置対象部位Xに付着または吸収させ、その後、処置対象部位Xの画像情報を取得する(ステップS211)。すなわち、蛍光薬剤を処置対象部位Xに付着または吸収させた状態で、処置対象部位Xに励起光を照射することにより、蛍光薬剤を励起し処置対象部位Xから蛍光を生じさせる。
ステップS217では、出血状態でないことからモニタ50に白色光画像を表示し、次の画像情報の取得のため、ステップS211に戻る。また、ステップS216では、出血状態であるためモニタ50に補正画像を表示する。
これにより、組織が血で覆われている場合においても、励起光の多くが蛍光薬剤を含む組織に到達し、組織で発生した蛍光も多く内視鏡に到達することができる。
次に、本発明の第2の実施形態について説明する。
上記した第1の実施形態に係る内視鏡装置100では、補正画像生成部43は、白色光画像の補正対象領域の各画素のG信号に、蛍光画像における対応する各画素の信号値の定数倍を加算して補正画像を生成することとしたが、このような構成に限られるものではなく、例えば、補正画像生成部43が、白色光画像のうち、蛍光画像における第1閾値以上の輝度値の画素と対応する画素に対して色変換処理を行うことにより補正画像を生成してもよい。
そして、白色光画像の補正対象領域に対して、例えば以下のような色変換マトリクスを乗じることにより、血液で赤くなった補正対象領域を緑色に変換する。
次に、本発明の第3の実施形態について説明する。
上記した第1の実施形態に係る内視鏡装置100では、補正画像生成部43は、白色光画像のうち、蛍光画像における第1閾値以上の輝度の画素と対応する画素を強調するように補正した補正画像を生成したが、本実施形態においては、白色光画像のうち、蛍光画像を白色光画像のR信号により除算した除算画像における第2閾値以上の輝度の画素と対応する画素を強調するように補正した補正画像を生成する。
除算画像生成部46では、蛍光画像生成部41から入力された蛍光画像を白色光画像生成部42から入力された白色光画像のR信号で除算することにより除算画像を生成する。そして、補正画像生成部43では、除算画像から画素毎に予め定めた第2閾値と比較して第2閾値以上の輝度の画素を抽出し、白色光画像のうち、除算画像における第2閾値以上の輝度の画素と対応する画素からなる領域を補正対象領域と定める。
次に、本発明の第4の実施形態について説明する。
上述した第1の実施形態乃至第3の実施形態においては、出血状態の判定を処置対象部位X全体、すなわち、白色光画像全体に亘って行っていた。しかし、通常は処置対象部位Xのうち、特に病変部等の処置すべき箇所をモニタの中心に表示して処置を進めることが一般的である。そこで、本実施形態においては、出血状態判定部44が、白色光画像の中心部近傍を含む所定領域対して出血状態を判定する例について図6のフローチャートを参照して説明する。所定領域としては、例えば、表示画像の上下左右から1/4を除いた中心領域を例示する。
続いて、本発明の第5の実施形態について説明する。
蛍光画像を得るには、処置に先立って、癌細胞等の病変部に特異的に集積する蛍光薬剤を処置対象部位Xに付着または吸収させておく必要がある。しかし、処置や手術が長時間に及ぶような場合に、励起光を照射し続けると蛍光薬剤による蛍光が褪色する。このため、本実施形態では、図7に示すように、光源10を制御する光源制御部52を設けた内視鏡装置300を示した。
また、本実施形態においては、内視鏡装置を例示して説明したが、これに限定されるものではなく、他の任意の蛍光観察装置に適用することにしてもよい。
41 蛍光画像生成部
42 白色光画像生成部(参照画像生成部)
43 補正画像生成部
44 出血状態判定部
45 表示画像切替部
46 除算画像生成部
50 モニタ(画像表示部)
52 光源制御部
100 内視鏡装置(蛍光観察装置)
200 内視鏡装置(蛍光観察装置)
300 内視鏡装置(蛍光観察装置)
Claims (11)
- 被検体に励起光及び参照光を照射する光源と、
該光源からの前記励起光の照射により前記被検体において発生した蛍光を撮影し蛍光画像を生成する蛍光画像生成部と、
前記光源からの前記参照光の照射により前記被検体から戻る戻り光を撮影し参照画像を生成する参照画像生成部と、
前記参照画像のうち、前記蛍光画像における第1閾値以上の輝度の画素と対応する画素を強調するように補正した補正画像を生成する補正画像生成部と、
前記参照画像又は前記補正画像を表示する画像表示部と、
前記参照画像に基づいて前記被検体の出血領域を検出し、該出血領域が所定の範囲を超えるか否かを判定する出血状態判定部と、
該出状態判定部によって前記出血領域が所定の範囲を超えていないと判定された場合に前記参照画像を前記画像表示部に表示し、出血領域が所定の範囲を超えたと判定された場合に、前記補正画像を前記画像表示部に表示するように切り替える表示画像切替部と、
を備える蛍光観察装置。 - 前記補正画像生成部が、前記参照画像のうち、前記出血状態判定部により検出された前記出血領域であって、かつ、前記蛍光画像における第1閾値以上の輝度値の画素と対応する画素を強調するように補正した前記補正画像を生成する請求項1に記載の蛍光観察装置。
- 前記補正画像生成部が、前記参照画像のうち、前記蛍光画像における第1閾値以上の輝度の画素と対応する画素の所定の色信号に対して、前記蛍光画像における第1閾値以上の輝度の画素の当該輝度に基づく信号値を加算することにより前記補正画像を生成する請求項1又は請求項2に記載の蛍光観察装置。
- 前記補正画像生成部が、前記参照画像のうち、前記蛍光画像における第1閾値以上の輝度値の画素と対応する画素に対して色変換処理を行うことにより前記補正画像を生成する請求項1乃至請求項3の何れか1項に記載の蛍光観察装置。
- 前記補正画像生成部が、前記蛍光画像を前記参照画像のR信号で除算した除算画像を生成し、前記参照画像のうち、前記除算画像における第2閾値以上の輝度の画素と対応する画素を強調するように補正した前記補正画像を生成する請求項1に記載の蛍光観察装置。
- 前記補正画像生成部が、前記参照画像のうち、前記出血状態判定部により検出された前記出血領域であって、かつ、前記除算画像における第2閾値以上の輝度値の画素と対応する画素を強調するように補正した前記補正画像を生成する請求項5に記載の蛍光観察装置。
- 前記補正画像生成部が、前記参照画像のうち、前記除算画像における第2閾値以上の輝度の画素と対応する画素の所定の色信号に対して、前記除算画像における第2閾値以上の輝度の画素の当該輝度に基づく信号値を加算することにより前記補正画像を生成する請求項5又は請求項6に記載の蛍光観察装置。
- 前記補正画像生成部が、前記参照画像のうち、前記除算画像における第2閾値以上の輝度値の画素と対応する画素に対して色変換処理を行うことにより前記補正画像を生成する請求項5乃至請求項7の何れか1項に記載の蛍光観察装置。
- 前記光源は、前記出血状態判定部によって前記出血領域が所定の範囲を超えていないと判定された場合に前記励起光を照射せずに、前記出血領域が所定の範囲を超えたと判定された場合に前記励起光を照射する請求項1乃至請求項8の何れか1項に記載の蛍光観察装置。
- 前記出血状態判定部が、前記参照画像の中心部近傍を含む所定領域における前記出血領域を検出し、前記出血領域が所定の範囲を超えるか否かを判定する請求項1乃至請求項9の何れか1項に記載の蛍光観察装置。
- 前記出血状態判定部が、前記参照画像の各画素のR信号に対する信号強度と、該各画素のG信号又はB信号の少なくとも一方とを比較することにより前記出血領域を検出する請求項1乃至請求項10の何れか1項に記載の蛍光観察装置。
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JP6042817B2 (ja) | 2016-12-14 |
CN103841876B (zh) | 2016-03-09 |
CN103841876A (zh) | 2014-06-04 |
US9687158B2 (en) | 2017-06-27 |
US20140213871A1 (en) | 2014-07-31 |
JPWO2013051431A1 (ja) | 2015-03-30 |
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