What is the cause of the vertical acoustic shadow seen on this image?

Reynolds’s number predicts the occurrence of turbulent flow, this number is greater than __________________

Flow resistance depends on all of the following EXCEPT  ____________________

According to research it is indicated that cavitation ____________

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  __________________

Substantial acoustic energy directed outward from a linear array transducer not along the main axis of the beam is defined as  __________

During inspiration, venous flow in the upper extremities is  ______________________

Turbulent flow can be predicted with all of the following EXCEPT   ________________

A non-steady flow with acceleration and deceleration over the cardiac cycle is termed  _____________________

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