Which of the following decreases noise on a CT image?

A contrast material that is of a substantially higher density than that of the surrounding structures can be referred to as a _____ agent.

Which of the following are strategies that may reduce the radiation dose to the patient?1. Adjusting mAs to suit individual patient size2. Use of ATCM whenever possible3. Increasing pitch4. Performing multiphase studies only when clinical indications exist

Which of the following factors may affect a patient’s calculated glomerular filtration rate (GFR)?      1. age      2. sex      3. race

Increasing the pitch during a spiral (helical) CT examination adversely affects the spatial resolution in which of the following?

Which is a TRUE statement regarding an emergency department patient who is suspected of suffering from acute stroke?

Components of a comprehensive CT stroke management protocol typically include:      1. pre-contrast sequence of the brain      2. CTA of the brain and carotids      3. CT perfusion (CTP) of the brain

Although patient compliance can sometimes be a factor, what volume of oral contrast is a typically considered the minimum amount needed for a routine CT study of the abdomen and pelvis?

An average CT value for blood is

An image of a water phantom displays a wide range of pixel values. What can be said about this image?