How we can use light to see deep inside our bodies and brains – Mary Lou Jepsen

This is one of those TED talks that sounds absolutely groundbreaking and miraculous but has my bullshit detectors firing constantly because it sounds like a commercial without any critique or analysis of the technology. I realize that may be too much to ask for a TED Talk, which is supposed to "inspire" the public viewership, but I don't think it would hurt to inject some discussion of limitations and challenges.

But if you focus such an intense point focus of light in tissue, could you cause damage? Would a high enough intensity red light be absorbed by blood and damage those cells?

If not damage, could you use this to do targeted stimulation of neurons in the brain?

" In a series of mind-bending demos, inventor Mary Lou Jepsen shows how we can use red light to see and stimulate what's inside our bodies and brains. Taking us to the edge of optical physics, Jepsen unveils new technologies that utilize light and sound to track tumors, measure neural activity and could eventually replace the MRI machine with a cheaper, more efficient and wearable system. "

Holography and ultrasound to do visible wavelength deep tissue scans. This is really exciting new tech!