Gauss–Bonnet gravity

Mechanical index (MI) is an ultrasound metric. It is defined as

${\text{MI}}={\frac {\text{PNP}}{\sqrt {F_{c}}}},$

where

• PNP is the peak negative pressure of the ultrasound wave (MPa), derated by 0.3 dB cm^-1 MHz^-1 to account for the difference between in-water and in-tissue acoustic attenuation, and
• F_c is the center frequency of the ultrasound wave (MHz).

Mechanical index can be used as an estimate for the degree of bio-effects a given set of ultrasound parameters will induce. A higher mechanical index means a larger bio-effect. Currently the FDA stipulates that diagnostic ultrasound scanners cannot exceed a mechanical index of 1.9.

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.