During performances of an obstetrical ultrasound exam, you adjust the system parameters to improve the image. Which of the following parameters would increase acoustic exposure?

Hydrostatic pressure is defined as the pressure related to the weight of a blood column pressing on the v4essel wall measured at height above or below heart level

All of the following can be used to avoid nosocomial and cross-infection with sonographic probes, EXCEPT __________

The Principle that states that the volume of flow must be the same before, during and after a stenosis is the ____________

The assumptions in the system of sonographic instruments include all of the following except:

Wavelength has the greatest effect on ______

In an ultrasound phantom, the targets typically used for measuring axial resolution are __________

Which artifact is illustrated by this image?

In the image below, how many transmit focal zones are being used?  

Flow reversal in early diastole and lack of flow in late diastole is demonstrated with: _______