For pediatric pelvic imaging of superficial structures such as muscles or bowel, the preferred transducer frequency is

Most common pediatric malignant ovarian tumor

Power Doppler differs from color Doppler because it

The greatest technical error when calculating Doppler velocities occurs when the angle exceeds

The War of 1812 is considered a turning point in U.S. history because 

Which was NOT an advantage of the British during the American Revolution?

In the 1780s, all of the following contributed to dissatisfaction with the Articles of Confederation EXCEPT

The U.S. Constitution set-up a system of checks and balances and separation of powers, which of the following is the greatest example of these concepts?  

It has been widely debated if the American Revolutionary War was a true revolution or simply a rebellion. Which of the following demonstrates the idea that a true revolution in ideas took place after 1776 in America up to the War of 1812?   

What is the quality factor of a transducer and how is it affected by the presence of backing material?