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Ultrasound is just high frequency sound (which humans can not hear). Ultrasound has the same physical properties as human-audible sound. The method has two primary forms: sub-cavitation intensity and cavitation intensity. Sub-cavitation methods create high frequency vibrations, whilst cavitation methods cause more destructive microscopic ...
In a systematic review of 15 studies, patients who received ultrasound treatments were compared to those who received a placebo treatment. [7] The evidence demonstrated that therapeutic ultrasound significantly relieved pain, increases range of motion, and reduced WOMAC functional scores in patients with knee osteoarthritis when compared to the ...
Ultrasonic cavitation device is a surgical device using low frequency ultrasound energy to dissect or fragment tissues with low fiber content. It is basically an ultrasound probe (acoustic vibrator) combined with an aspirator device ( suction ).
Stable cavitation of intravascular microbubbles with FUS applies mechanical forces on BBB to increase permeability for drug delivery. Early studies that investigated the use of FUS for BBB disruption used ultrasound to increase the permeability of the blood vessels either by increasing the temperature (usually to 40-45°C) or forming gas bubbles (inertial cavitation).
These procedures generally use lower frequencies than medical diagnostic ultrasound (from 0.7 to 2 MHz), but higher the frequency means lower the focusing energy. HIFU treatment is often guided by MRI. Focused ultrasound may be used to dissolve kidney stones by lithotripsy. Ultrasound may be used for cataract treatment by phacoemulsification.
Ultrasonic cavitation inception will occur when the acceleration of the ultrasound source is enough to produce the needed pressure drop. This pressure drop depends on the value of the acceleration and the size of the affected volume by the pressure wave. The dimensionless number that predicts ultrasonic cavitation is the Garcia-Atance number.
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