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Mechanical index (MI) is a unitless ultras … Mechanical index (MI) is a unitless ultrasound metric. It is defined as where
* Pr is the peak rarefaction pressure of the ultrasound wave (MPa), derated by an attenuation factor to account for in-tissue acoustic attenuation
* fc is the center frequency of the ultrasound wave (MHz). MI is measured with a calibrated hydrophone in a tank of water. The pulse pressure squared integral (ppsi) values are measured along the axis of the ultrasound beam. The Pr is calculated by applying an attenuation coefficient to the maximum negative ppsi. MI is a unitless number that can be used as an index of cavitation bio-effects; a higher MI value indicates greater exposure. Levels below 0.3 are generally considered to have no detectable effects. Currently the FDA stipulates that diagnostic ultrasound scanners cannot exceed a mechanical index of 1.9.s cannot exceed a mechanical index of 1.9.
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| rdfs:comment |
Mechanical index (MI) is a unitless ultras … Mechanical index (MI) is a unitless ultrasound metric. It is defined as where
* Pr is the peak rarefaction pressure of the ultrasound wave (MPa), derated by an attenuation factor to account for in-tissue acoustic attenuation
* fc is the center frequency of the ultrasound wave (MHz). MI is measured with a calibrated hydrophone in a tank of water. The pulse pressure squared integral (ppsi) values are measured along the axis of the ultrasound beam. The Pr is calculated by applying an attenuation coefficient to the maximum negative ppsi. coefficient to the maximum negative ppsi.
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| rdfs:label |
Mechanical index
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