Medical control device and medical observation system
A medical control device includes: a dimming control unit configured to control an operation of a light source device configured to emit first light and second light, and adjust light amounts of the first and the second light; and an imaging control unit configured to control an operation of an imaging device including at least one imaging element, irradiate an observation target with the first light to capture return light of the first light via the observation target to generate a first captured image, and irradiate the observation target with the second light to capture return light of the second light via the observation target to generate a second captured image. The imaging control unit is configured to execute changing an exposure period of the imaging element, and discarding image information generated by the imaging element according to light reception in a partial period of the exposure period.
1 . A medical control device comprising:
circuitry configured to
control an operation of a light source configured to emit first light and second light having a wavelength band different from a wavelength band of the first light, and
adjust a light amount of the first light and a light amount of the second light,
control an operation of an imaging device including a first imaging element and a second imaging element,
irradiate an observation target with the first light to capture return light of the first light via the observation target to generate a first captured image, and
irradiate the observation target with the second light to capture return light of the second light via the observation target to generate a second captured image, wherein the circuitry is further configured to execute
first processing of changing an exposure period of the imaging element, and
second processing of discarding image information generated by the imaging element according to light reception in a partial period of the exposure period, and
the circuitry is further configured to control an increase, after the light amount of the first light and the light amount of the second light decrease to a drive limit value, a diaphragm amount of an electronic shutter of the first imaging element and a diaphragm amount of an electronic shutter of the second imaging element while maintaining a state in which a ratio between an effective exposure period of the first imaging element and an effective exposure period of the second imaging element is a specific ratio.
2 . The medical control device according to claim 1 , wherein the circuitry is configured to adjust each of the light amount of the first light and the light amount of the second light while maintaining a state in which a ratio between the light amount of the first light and the light amount of the second light is a specific ratio.
3 . The medical control device according to claim 1 , wherein the second processing adjusts the diaphragm amount of the electronic shutter of the first imaging element to discard the image information including charges accumulated for each pixel.
4 . The medical control device according to claim 1 , wherein the second processing is executed when the first captured image and the second captured image are transmitted from the imaging device to the medical control device.
5 . The medical control device according to claim 1 , wherein the first processing is long-time exposure in which a plurality of fields is set as one field in a pseudo manner.
6 . The medical control device according to claim 1 , wherein
the imaging element includes
the first imaging element configured to generate the first captured image, and
the second imaging element configured to generate the second captured image,
the second processing is processing of adjusting the diaphragm amount of the electronic shutter of the first imaging element and the diaphragm amount of the electronic shutter of the second imaging element,
in a case where brightness of the first captured image and the second captured image is lowered,
the circuitry is configured to reduce the light amount of the first light and the light amount of the second light while maintaining a state in which a ratio between the light amount of the first light and the light amount of the second light is a specific ratio.
7 . The medical control device according to claim 1 , wherein
the first light is excitation light for generating fluorescence from the observation target, and
the second light is white light.
8 . The medical control device according to claim 1 , wherein
the light source is configured to emit a plurality of the first light having different wavelength bands,
the second processing is processing of adjusting the diaphragm amount of the electronic shutter of the imaging element, and
the circuitry is further configured to set, in the second processing, the diaphragm amount of the electronic shutter of the first imaging element to a diaphragm amount corresponding to first light emitted from the light source among the plurality of the first light.
9 . The medical control device according to claim 1 , wherein the first imaging element and the second imaging element each comprise a complementary metal oxide semiconductor (CMOS) image sensor.
10 . The medical control device according to claim 1 , wherein the imaging device further comprises a prism configured to separate return light from the observation target and direct a first portion of the return light toward the first imaging element and a second portion of the return light toward the second imaging element.
11 . The medical control device according to claim 7 , wherein the excitation light is near-infrared excitation light that excites a fluorescent substance comprising indocyanine green.
12 . The medical control device according to claim 1 , wherein the imaging device is incorporated into a rigid endoscope.
13 . The medical control device according to claim 1 , wherein the imaging device is incorporated into a flexible endoscope.
14 . The medical control device according to claim 1 , wherein the imaging device is incorporated into a surgical microscope.
15 . A medical observation system comprising:
a light source configured to emit first light and second light having a wavelength band different from a wavelength band of the first light;
an imaging device including a first imaging element and a second imaging element, the imaging device being configured to
irradiate an observation target with the first light to capture return light of the first light via the observation target to generate a first captured image, and
irradiate the observation target with the second light to capture return light of the second light via the observation target to generate a second captured image; and
circuitry configured to control operations of the light source device and the imaging device, the circuitry further configured to
control an operation of the light source device and adjust a light amount of the first light and a light amount of the second light, and
control an operation of the imaging device, and execute
first processing of changing an exposure period of the imaging element, and
second processing of discarding image information generated by the imaging element according to light reception in a partial period of the exposure period, wherein
the circuitry is further configured to control an increase, after the light amount of the first light and the light amount of the second light decrease to a drive limit value, a diaphragm amount of an electronic shutter of the first imaging element and a diaphragm amount of an electronic shutter of the second imaging element while maintaining a state in which a ratio between an effective exposure period of the first imaging element and an effective exposure period of the second imaging element is a specific ratio.
16 . The medical observation system according to claim 15 , wherein the first processing is long-time exposure in which a plurality of fields is set as one field in a pseudo manner.
17 . The medical observation system according to claim 15 , wherein the first light is excitation light for generating fluorescence from the observation target, and the second light is white light.
18 . The medical observation system according to claim 15 , wherein the imaging device is incorporated into a rigid endoscope.
19 . The medical observation system according to claim 15 , wherein the imaging device is incorporated into a flexible endoscope.
20 . The medical control device according to claim 1 , wherein the image information corresponds to a charge accumulated for each pixel by the imaging element.