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In this next video, we hold the animal, another mouse, in position to image its liver.
这一段影片里，我们让一只动物，另一只老鼠，保持肝脏摄影的位置。
The liver has a lot of blood vessels inside.
肝脏内部有很多血管。
You can see them as a tree-like network.
你可以看到它们呈树状网络。
Because our imaging exposure time is too short, only 15 microseconds, there is no blur at all, despite the movement of the animal during the imaging.
由于我们的成像曝光时间过短，只有 15 微秒，图像完全没有模糊，即使动物会在成像过程会动来动去。
The mouse is breathing normally, and every frame in our video is clear.
老鼠正常呼吸，我们视频的每一帧都是清晰的。
With each slice we can clearly see the internal structure and the blood vessel network.
通过每一片，我们都可以清晰地看到它的内部结构和血管网络。
This enables us to differentiate a tumor from normal tissue.
这让我们可以区分肿瘤和正常组织。
The light dose we use is well below the safety limit, and we don't need to inject any contrast agents.
我们使用的光剂量远远低于安全限度，我们也不需要注射任何造影剂。
It is totally non-invasive.
完全是非侵入式的。
Now, for an example, that is a little closer to home.
比如现在这个例子，更贴近我们的生活。
This is a side by side comparison of human brain images.
这是人体脑部图像的对比图。
On the left, you see an image from an MRI.
左边是一张核磁共振的图像。
On the right, from photoacoustic imaging.
右边是一张光声图像。
Photoacoustic imaging can reveal detailed vasculature, but with even faster detection of the brain functions and without using the costly high-magnetic field.
光声成像可以展示精确的脉管系统，但是更快地检测脑功能，且不使用昂贵的高磁场。
What you are seeing here is the brain's activity, where a patient, now a human this time, taps his finger, puckers his lips, taps his tongue and is listening and thinking of words.
你现在看到的是脑活动，患者，这次是一个人类，轻敲他的手指，撅起嘴，动动舌头，听着想着词语。
Although I don't have a visual for it, I'd like to share one more example.
虽然我没有视觉资料，但是我还想分享另外一个例子。
In science fiction, micro robots enter our bodies to cure diseases in hard-to-reach areas.
在科幻小说里，微型机器人钻进我们的身体难以触及的区域治疗疾病。
However, in reality, locating, guiding and controlling them inside of the body is a big challenge.
然而，实际上，在体内定位、引导、控制它们是个很大的挑战。
Just like the satellites in space guiding cars to their destinations, a photoacoustic imaging system outside the body can serve similarly as a GPS for the micro robots.
就像太空中的卫星为汽车导航至目的地，体外的光声成像系统类似给微型机器人提供全球定位系统。
Biomedical optics has come a long way.
生物医学光学发展已久。
The microscope used every day in modern medical diagnosis was invented in the 17th century, which revolutionized 19th century medicine by letting us see into a cell.
现代医学诊断中每日使用的显微镜是 17 世纪发明的，彻底改变了 19 世纪的医学，让我们可以看得清细胞。
Then, optical coherence tomography developed in 1990s increased optical penetration to 1 millimeter, bringing huge benefits to clinical care for skin and eyes.
随后，光学相干层析成像在上世纪 90 年代被研发出来，将光穿透增至一毫米，造福了皮肤和眼部的临床护理。
Now, photoacoustic imaging, first adopted for medical use in the 2000s, allows us to see even more, allowing penetration by another order of magnitude, to several centimeters, allowing organ-level in vivo human imaging.
如今，光声成像在二十世纪初第一次被使用，让我们能看见更多，让穿透力更进一步至几厘米，让活体人体成像达到器官水平。
Photoacoustic imaging is a highly-active and a fast-growing research field.
光声成像是一个非常活跃、成长迅速的研究领域。
Using microwaves instead of light, this imaging method holds promises for whole body penetration in humans in the future.
用微波代替光线，这项成像技术有希望在未来达到人体全身穿透。
We are hoping that the further advancement of this technology will aid early diagnosis of cancer and brain diseases, ultimately benefiting global health.
我们希望这项技术未来的发展可以帮助癌症和脑部疾病的早期诊断，最终造福全球的人类健康。
I hope you all can share my excitement over this fast-growing field and hope you'll join us in advancing the technology.
希望你能感受到我对这个飞速发展领域的兴奋，期待你可以加入我为这项技术做出贡献。
Thank you.
谢谢大家！
