Speed of sound in soft tissue

The speed of sound in soft tissue is 1540 meters per second. This is a value you must know.

This value can also be expressed as 1.54 mm/us. Here's how that conversion is made:

1540 m/s = 1540 x 1000 mm/s = 1,540,000 mm/s

1,540,000 mm/s = 1,540,000 mm / 1,000,000 us = 1.54 mm/us.

1.54 mm/us is the value that all diagnostic ultrasound systems use in the range equation to calculate the distance to an interface.

You should know that 1540 m/s = 1.54 mm/us