A SIMPLE AND ACCURATE FORMULA FOR THE SOUND-VELOCITY IN WATER

The sound velocity in test objects and phantoms is often measured by p erforming a differential measurement with pure water. To promote stand ardization, a simple formula for the sound velocity in water is derive d that renders true values within 0.20 m s(-1) over the temperature ra nge 15-35 C, The formula is given by c = 1404.3 + 4.7 T - 0.04 T-2, Wi th sound velocity c in m s(-1) and temperature T in C. (C) 1998 World Federation for Ultrasound in Medicine & Biology.