| Pulse Duration | Microseconds (∼1–5 µs typical) | Microseconds to milliseconds (short bursts for mechanical disruption) |
Its kind of hard to know what this means - some of the numbers seem pretty close/crossover - but I don't think saying the difference is akin to a laser and a light.
Please don't be sarcastic for a possibility genuine question. It contributes to alienating the askers, not to mention the risk of some taking it quite literally.
That's like asking how if a laser can cut through steel how lamps can be safe to have indoors.
Do you have a link or something that compares the power in both? I can't find one.
This is the summary I get from chatgpt - comparing Histotripsy and ultrasound imaging
| Property | Strongest Diagnostic / Imaging Ultrasound | Histotripsy (Therapeutic Ultrasound |
| Frequency | 2 – 10 MHz (obstetric: 2–5 MHz; high-res imaging up to 15 MHz) | 0.25 – 3 MHz (sometimes up to 6 MHz) |
| Pressure (Peak Negative) | Up to ~5–6 MPa (mechanical index limit ≈ 1.9) | 10 – 100 MPa (depending on type: intrinsic vs. boiling histotripsy) |
| Intensity (Spatial Peak, Temporal Average) | Typically < 0.1 W/cm²; upper safe limit ≈ 0.72 W/cm² (FDA/AIUM) | 100 – 10,000 W/cm² (very high peak intensities) |
| Pulse Duration | Microseconds (∼1–5 µs typical) | Microseconds to milliseconds (short bursts for mechanical disruption) |
Its kind of hard to know what this means - some of the numbers seem pretty close/crossover - but I don't think saying the difference is akin to a laser and a light.
There are 2 to 5 orders of magnitude difference in intensity. That alone is a pretty big difference.
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You can vary the frequency, power, energy, focus... is not the SAME ultrasound.
But surely it could cause some damage at a lower frequency, power, etc anyway?
Potentially, but these things are well controlled and understood: https://www.bmus.org/education-and-cpd/cpd-resources/top-tip...
Why “surely”?
Most things that are harmless or even necessary at one level are deadly at another: heat, light, water, food, air… pretty much everything really.
“Dosis sola facit venenum” (only the dose makes the poison)
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Shit, you figured it out. It's not! That's whats been causing all the autism! Big ultrasound has been managing to keep this under wraps for decades!
Please don't be sarcastic for a possibility genuine question. It contributes to alienating the askers, not to mention the risk of some taking it quite literally.