, Aspiring pilot, Alaskan. 1  Well, if you want to be a USAF drone pilot, the process is 5+ years, and relatively difficult, the most difficult section being the flight training itself. Manned flight school has a ~30% washout rate, so I assume the drone program is similar.
A bottle of Omniscan contrast agent. MRI contrast agents are a group of contrast media used to improve the visibility of internal body structures in magnetic resonance imaging (MRI). The most commonly used compounds for contrast enhancement are gadolinium-based.
There are four types of contrast agent used in CT: 1  The type that is given via intravenous (through a vein) injection. 2  The type that is given orally. 3  The type that is given rectally. 4  A much less common type of contrast used in CT is inhaled as a gas and used for special lung and brain imaging.