Drinking cranberry juice is a fairly well-known and natural way to both help prevent urinary tract infections, as well as help speed the recovery process when a UTI develops. Just drinking two 4-ounce glasses of cranberry juice daily is often enough to both prevent a UTI and speed recovery when an infection does develop.
Ultrasound waves travel faster through a stiff medium, such as bone. In echocardiography, the velocity of sound is assumed to be approximately 1,540 m/sec (or 1.54 m/msec). Sound waves travel through the air with speed of 330 m/s.
Imaging is made possible by the transmission and return of sound waves of a frequency much too high for the human ear to hear; Audible sound is in the range of 20- greater than 20,000Hz; Allows for the transmission of ultrasound waves into the body. These waves travel a distance where they reach organs/structures within the desired range of imaging. They bounce off the structure, and return to the ultrasound transducer where they are received and turned into an image by the ultrasound system.