Question #34

Which of the following is not true regarding contrast agents?

A.IV saline is often a reasonable contrast agent for right sided structures
B. Commercially available contrast agents require a shell to prevent rapid diffusion of the agent into the blood.
C. Contrast agents are typically inert gases which are high density perflourocarbons.
D. Commercial contrast bubbles of the size needed to pass through the pulmonary capillary bed do not naturally resonate in the range of frequency used for diagnostic ultrasound.
E. Commercial contrast agents increase the reflectivity of the blood pool by roughly 30 decibels.