ultrasound detection != ultrasound treatment
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@ Ben R.
the ultrasound used for a "treatment" (most likely sports related) is very high powered and intended to sonically treat deep muscle tissue. Muscle tissue is also particularly dense and hard to beam sound through. Both reasons for high powered ultrasound.
the ultrasound used for detection (like in seeing your babies) is low powered and intended only to return a soundwave to form an image. It also has to go through nice soft skin and an amnio sac and therefore doesn't need penetrating power (I know, I said 'penetrating'.....). Just think--women don't get their babies squeezed out when they go in for an ultrasound.
the ultrasound being considered for the "bal-busting" treatment only has to go through the very small amount of soft tissue in your scrotum and testes and so is the low-powered kind, so no worries about busting your nuts in any way other than the figurative.