The fraction of time that pulsed ultrasound is actually “on” is the  ______________________

The crystal in the ultrasound transducer convertsn   _________________

Resistance of the blood flow depends on ________________.

Adjusting all of the following parameters will correct the Doppler artifact displayed, EXCEPT  ________________

If the PRF increases, the duty factor _______________

An artifact that is produced from interaction of the incident beam with a curved surface and results in an acoustic shadow is referred to as  __________________

When the length of a vessel is halved  _____________

Edge artifact (edge shadow) is mainly due to __________________

When employing a tissue-equivalent phantom, the depth at which echoes are no longer detected is an indicator of  ________________

If [ T ] is for time (µs), and [ f ] is for frequency (MHz), This equation (T=1/f) is used to calculate __________