Diagnostic system
A diagnostic system comprises a spectral image pickup means that picks up a spectral image in a predetermined wavelength region in a body cavity and obtains spectral image data, an image processing means that obtains, from the spectral image data, an index-value for discriminating between a diseased portion and a healthy portion, and generates and outputs an indicator image based on the index-value, and a monitor on which the indicator image is displayed, wherein, for each pixel of the spectral image, the image processing means defines β obtained by a predetermined expression as the index-value, while using the spectral image data P 1 at a first wavelength which is around a wavelength of 542 nm, the spectral image data P 2 at a second wavelength which is around a wavelength of 558 nm and the spectral image data P 3 at a third wavelength which is around a wavelength of 578 nm.
1. A diagnostic system, comprising:
a spectral image pickup that picks up a spectral image in a predetermined wavelength region in a body cavity and obtains spectral image data;
an image processor that obtains, from the spectral image data, an index-value for discriminating between a diseased portion and a healthy portion, and generates and outputs an indicator image based on the index-value; and
a monitor on which the indicator image is displayed,
wherein, for each pixel of the spectral image, the image processor defines β obtained by a following expression as the index-value,
β=2 P 2 −P 1 −P 3
while using the spectral image data P 1 at a first wavelength which is around a wavelength of 542 nm, the spectral image data P 2 at a second wavelength which is around a wavelength of 558 nm and the spectral image data P 3 at a third wavelength which is around a wavelength of 578 nm.
2. The diagnostic system according to claim 1 , wherein the image processor obtains a ratio between oxyhemoglobin and deoxyhemoglobin from the index-value, and generates the indicator image based on the ratio.
3. The diagnostic system according to claim 2 , wherein the image processor generates the indicator image by assigning a predetermined color based on the ratio between oxyhemoglobin and deoxyhemoglobin to each pixel of the spectral image.
4. The diagnostic system according to claim 1 ,
wherein:
the image processor outputs a color image by combining the spectral image data in wavelength bands corresponding to blue, green and red; and
the color image and the indicator image are displayed on the monitor while being aligned side by side.
5. The diagnostic system according to claim 1 , further comprising a standardizer that integrates the spectral image data in a predetermined wavelength range to obtain an integrated value, and corrects the spectral image data so that the integrated value coincides with a reference value.
6. The diagnostic system according to claim 5 , wherein the predetermined wavelength range is selected from a range of 600 nm to 800 nm.
7. The diagnostic system according to claim 1 , further comprising a standardizer that corrects the spectral image data so that the spectral image data at a wavelength corresponding to an isosbestic point of hemoglobin coincides with a reference value.
8. The diagnostic system according to claim 1 ,
wherein:
the predetermined wavelength region is 400 nm to 800 nm; and
the spectral image includes a plurality of images shot at an interval of a predetermined wavelength defined in a range of 1 nm to 10 nm.
9. The diagnostic system according to claim 1 ,
wherein:
the first wavelength is a certain wavelength in a range of 530 nm to 545 nm;
the second wavelength is a certain wavelength in a range of 550 nm to 568 nm; and
the third wavelength is a certain wavelength in a range of 570 nm to 584 nm.
10. A diagnostic system, comprising:
a spectral image pickup that picks up a spectral image in a predetermined wavelength region in a body cavity and obtains spectral image data;
an image processor that obtains, from the spectral image data, an index-value for discriminating between a diseased portion and a healthy portion, and generates and outputs an indicator image based on the index-value; and
a monitor on which the indicator image is displayed,
wherein, for each pixel of the spectral image, the image processor defines γ obtained by a following expression as the index-value,
γ
=
2
P
2
-
P
1
-
P
3
a
while using the spectral image data P 1 at a first wavelength which is around a wavelength of 542 nm, the spectral image data P 2 at a second wavelength which is around a wavelength of 558 nm, the spectral image data P 3 at a third wavelength which is around a wavelength of 578 nm and a standardization coefficient indicates an amount of light incident on each pixel.
11. The diagnostic system according to claim 10 , wherein the standardization coefficient is an integrated value of the spectral image data at respective wavelengths in the predetermined wavelength region.
12. The diagnostic system according to claim 10 , wherein the image processor obtains a ratio between oxyhemoglobin and deoxyhemoglobin from the index-value, and generates the indicator image based on the ratio.
13. The diagnostic system according to claim 12 , wherein the image processor generates the indicator image by assigning a predetermined color based on the ratio between oxyhemoglobin and deoxyhemoglobin to each pixel of the spectral image.
14. The diagnostic system according to claim 10 ,
wherein:
the image processor outputs a color image by combining the spectral image data in wavelength bands corresponding to blue, green and red; and
the color image and the indicator image are displayed on the monitor while being aligned side by side.
15. The diagnostic system according to claim 10 ,
wherein:
the predetermined wavelength region is 400 nm to 800 nm; and
the spectral image includes a plurality of images shot at an interval of a predetermined wavelength defined in a range of 1 nm to 10 nm.
16. The diagnostic system according to claim 10 ,
wherein:
the first wavelength is a certain wavelength in a range of 530 nm to 545 nm;
the second wavelength is a certain wavelength in a range of 550 nm to 568 nm; and
the third wavelength is a certain wavelength in a range of 570 nm to 584 nm.