Armrit Practice Study Guide Rated A+

90 degree {Ans: Of the following radio-frequency pulse flip-angles, which is the smallest that will produce the maximum signal?}T2*(star) {Ans: A time constant that characterizes the fast rate of transverse magnetization because of the inhomogeneities of the main magnetic field is:}Tendency of a substance to attract or repel magnetic lines of force which is decided by the magnetic properties of its electrons {Ans: Magnetic susceptibility is defined as the:}Decrease T1 relaxation time, therefore producing high signal {Ans: The mechanism of T1 contrast enhancement agents is to:}Cancel their magnetic moments. {Ans: In the main magnetic field of an MRI system, protons that are oriented parallel and those that are oriented anti-parallel will have what effect on each other?}The transverse component will increase {Ans: Once the net magnetization vector (NMV) has moved away from equilibrium, the following will occur:}