Ultrasound penetrates bone like sunlight through frosted glass, but the image comes out blurry. The skull is uneven and dense, scattering sound waves, so hitting a precise spot in the brain is tricky. Conventional devices try to fix this with electronics, but the result is still far from perfect.
Here's the new idea: make a lens that physically matches the shape of a specific person's skull. Its surface is designed so that waves passing through it are evened out and focused at a target point. The lens hugs the skin and bone, reducing sound loss at the boundary between tissues. In computer models for different people, this lens consistently focused ultrasound deep in the brain without exceeding safe pressure levels.
This approach paves the way for noninvasive treatment of brain disorders — from tremors to tumors. It's like getting glasses tailored to each eye, except here it's not light being corrected but sound.
The human skull absorbs up to 70% of ultrasound energy, so tailoring the lens to the specific bone shape could double treatment efficiency.
In the movie 'Total Recall,' memories were implanted via implants, but future ultrasound lenses could do it without a single incision.