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About: Mechanical index     Goto   Sponge   NotDistinct   Permalink

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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.