Estrogen and progesterone are produced by the _____.

Which of these shunts exists between the right and left atria?

The diameter of an unfocused, disc-shaped piezoelectric crystal is 1.2 cm. The near zone length is 8 cm. What is the best estimate for the lateral resolution at depth of 16 cm?

To which of the following do the x-axis of a b-mode, the y-axis of an m-mode and the x-axis of an a-mode all relate?

The mode that produces lines related to the changing position of reflectors in the body with respect to time is called _____.

Which of these could be the Doppler received  frequency if an operating frequency of 5MHz is used to interrogate blood cells moving towards sound source? 

The purpose of the pulser is to

With B-mode, on which axis the strength of the reflection input?

What will lower the value of an ultrasound system’s lateral resolution?

All of the following occur with focusing except: