Diagnostic ultrasound machines are limited in their output power so that the sound waves don't cavity the microbubbles in the body.
What I want to know is how do manufacturers prove their power output is safe?
The piezo crystals are variable, so just knowing the RF power from the amplifier isn't good enough. Do they use a hydrophone?
Where do I find the regulations on the test conditions? Currently I am trying to determine if certain manufacturers are 'cheating' like car makers do with fuel mileage.