ARMRIT PHYSICS PRACTICE TEST - ANSWERED

ARMRIT PHYSICS PRACTICE TEST - ANSWERED The tissue characteristic that depends heavily on the relative content of fat molecules and free water is: - Ans ️️ -Hydrogen concentration. T1 is the measurement of time for the longitudinal component of the net magnetization vector to recover what percentage of its original value after the application of a 90 degree radio-frequency pulse? - Ans ️️ -63% Immediately after an initial 90 degree radio-frequency pulse is turned off, the hydrogen protons will begin to: - Ans ️️ -Dephase A 90 degree radio-frequency pulse will alter the net magnetization vector. Another effect is: - Ans ️️ -The hydrogen protons will dephase The basic process of MR signal generation contains two basic steps, they are: - Ans ️️ - Stimulation and relaxation. An equation derived to predict the MR signal intensity of a particular tissue as the result of a Spin-echo pulse sequence is the: - Ans ️️ -Bloch equation The component Mxy is most associated with: - Ans ️️ -Transverse to B0; T2 relaxation; transverse magnetization After a 90 degree radio-frequency pulse, the net magnetization vector begins to return to equilibrium. When the NMV is half-way between transverse and equilibrium, what are the magnitudes of the longitudinal component and the transverse component? - Ans ️️ - Longitudinal component = greater than zero/transverse component = greater than zero. When is the net magnetization vector at its maximum magnitude? - Ans ️️ -At equilibrium. The Larmor frequency of hydrogen protons in a 1.5 Tesla magnetic field is: - Ans ️️ -63.9 MHz/Tesla.