Science and Technology Daily reporter Zhang Jiaxing

“Take a break for a while, open your eyes, stare at the green point, and keep it. Okay-” At the Beijing Tongren Hospital, a seemingly normal eye camera is checked for the subject.

“This machine collects 12 wavelengths of image collection.” Feng Ximeng, a doctor of Peking University, who participated in the camera design, said that under different wavelengths, the eyes are different in different waves, and they can obtain different depth levels of the retina.

For analysis of comprehensive information, in just a few minutes, the blood vessels in the blood vessels in the eyeballs in the eyeballs are clear at a glance.

“The index obtained by the world’s first 12 -color bottom camera is closely related to the disease that may be developing.” On March 17, Ren Qiushi, the person in charge of the team and the professor of the Department of Biomedicine Engineering of the Future Technology of Peking University, told the reporter of the Science and Technology Daily that in the early or or in the early stage of the disease or In the early days, when the body structure has not changed significantly, there will be abnormal blood flow, blood oxygen and metabolism.

北大团队研制全球首台12色眼底相机,能拍短视频

As the so -called “seeing the micro -knowledge, inspecting Yu Wei Meng”, the team hopes to obtain the “dead corner” information of the eyeball by developing this device, and then turn the eyeball into a “crystal ball” that can predict the disease.

12 color light photography, the eyeballs are different

The eyes are “window”. Usually people obtain external information through it, while medical engineering scholars obtain information in the body through it.

“Eye cameras that have been applied can monitor cardiovascular and cerebrovascular diseases by analyzing the vascular form, dynamic vein diameter, proportional, curvature, etc. through the analysis of the vascular forms in the eyes.” Professor Zhou Chuanqing said that the eyes are the only part of the arterial blood vessels that can be directly observed in the human body to pass a health signal.

However, only taking color photos can far from meeting the requirements of medical diagnosis. Scientists have found that if the light is split into monochrome light, the information obtained will double.

“In the green light of 500 nanometers, oxygen -containing hemoglobin in the blood vessels is basically the same as hemoglobin without oxygen, and the photos taken can see that the dynamic veins are similar; but in the red light of 605 nanometer The absorption of light is large, and there are many red light reflected by oxygen -containing hemoglobin. The photos taken can obviously see the arteries bright, but the red light absorbed by hemoglobin without oxygen, so the vein is dark. “Feng Ximeng explained, explained, Existing equipment cannot give the differences of veins on data, and generally depends on doctors’ experience judgments.

To this end, the Peking University team used 12 -color light sources in 470 nanometer to 810 nanometers for imaging, and took 12 photos of 12 different colors at a time.

Multi -mode eye function imaging

Different wavelength advantages are different. Zhou Chuanqing explained: “Red light or near -infrared light, it has a strong penetration in biological tissue and can take deeper tissue information. And the imaging of blue light and green light on the shallow tissue will be clearer.”

Disassemble the white light, the 12 -color base camera allows different wavelengths to exhibition director. For example, red light can compare the deeper retinal imaging of the retina. Feng Ximeng said, “Some lesions will appear in a specific depth, so multi -wavelengths can achieve scanning of different depth lesions.”

北大团队研制全球首台12色眼底相机,能拍短视频

In addition, the development of the equipment also needs to react with instinct stress. “Our multi -spectrum viewing technology can quickly take pictures within 0.3 seconds.” Feng Ximeng said, because the pupils will shrink significantly after 0.3 seconds, blocking sufficient light to enter.

Parallel laser beam, can shoot short videos

The blood in the blood vessels is not static, but flowing. Therefore, dynamic data is essential for the diagnosis of the disease.

“New equipment can shoot a short video of 5 seconds, and the light source is laser.” Feng Ximeng said that the laser light source can turn on the “sports mode” of the shooting. Part of the eyeball.

In order to enable the video to shoot the entire eyeball, the team innovatively designed laser as a light path for incident light, which not only expands the field of vision, but also synchronizes measurement and evaluation with the data of the 12 rackets.

(Data obtained by the analysis of 12 -color photos and video information)

Through the analysis of short videos, a series of dynamic data can be obtained, such as flow velocity, pulsation, blood flow irrigation, oxygen metabolism, and so on.

But for doctors, what’s the use of blood flow rate? The physical data of blood alone cannot be used for clinical diagnosis.

“The creation of medical devices requires closely connecting clinical clinicals to clinical services.” Ren Qiushi said that the combination of medical workers requires multi -disciplinary cross -crossing. Science and engineering not only understands medical language, but also presents medical languages ​​on the equipment.

On the one hand, the 12 coorders took the vascular form and measured the diameter. On the other hand, the laser video shot the blood flow speed and showed dynamics. The algorithm of information science can transform these physical data into medical data.

“I actually want to provide the doctor with the answer that he knows. For example, the difference in oxygen content between the veins is oxygen metabolism data, combined with blood flow rate and pulsation speed, you can calculate the youth of the cardiovascular and cerebrovascular or not “Feng Ximeng said that through the analysis of data, the coverage of microcirculation can be achieved.

When can I use it?

“At present, the equipment has passed the medical device testing of the authoritative department, and has been officially recognized in terms of safety and equipment performance.” Zhou Chuanqing introduced that pre -clinical trials have been carried out in many places across the country.

北大团队研制全球首台12色眼底相机,能拍短视频

So, when can you obtain a medical device registration certificate and provide medical services for the people?

“We have obtained the test report of medical devices and can conduct clinical trials. When clinical trials get enough data, we can apply for listing to relevant departments.” Zhou Chuanqing stated that in Beijing, Shenzhen and other places, the team has carried out relevant data. Accumulation, but due to the epidemic, clinical trials in various places are slower than expected. At present, when you look at the data optimistically, it is estimated that after completing the inspection and all collection and analysis of sufficient scale of people, you can get the registration certificate in two months.

Device prototype

According to reports, due to the easy operation of the bottom of the eye, the two eye inspections can be completed within 10 minutes. After the data transmission is transmitted to the background for analysis, the results can be produced within half an hour. Screening, establishing a “look whistle” for the diagnosis and discovery of the disease.

“We hope that in two or three years, we can promote the instrument to enter the community as a screening equipment for the disease. Because it uses a fully automatic design, it is especially suitable for the screening of large -scale people.” Zhou Chuanqing said.

At the same time, the team is also cooperating with the ophthalmology department, neurology, cardiology, and nephrology of major hospitals to conduct large -scale clinical research on large samples in order to explore the corresponding relationship between the scenes in the “crystal ball” and the disease between the disease.

Edit: Li Xiaohang (Internship)

Review: Wang Xiaolong

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