"Mechanical index is an indication of an ultrasound beam's ability to cause cavitation-related bioeffects, and this is thought to be a reasonable proxy for micromechanical damage. It is "strictly a cavitation index," but is meant to be interpreted more broadly as tissue mechanical stress/damage."
"Pr (megapascals) represents the peak rarefaction (peak negative pressure)"
"f (megahertz) represents the centre frequency of the US beam"
"In the U.S. the FDA mandates that the mechanical index (MI) be kept below 1.9 4."
"In the U.S. the FDA mandates that the mechanical index (MI) be kept below 1.9 4."
"For obstetric and neonatal scanning there is no known reason to restrict scanning times with a MI value between 0-0.3. There is possibility of minor damage to the neonatal lung or intestine with MI values between 0.3-0.7 and minimising exposure time at these values is suggested."
Expected headings
"Recommendations"
"For obstetric and neonatal scanning there is no known reason to restrict scanning times with a MI value between 0-0.3. There is possibility of minor damage to the neonatal lung or intestine with MI values between 0.3-0.7 and minimising exposure time at these values is suggested."