ARMRIT Physics Exam Guide [Reviewed Study Set] 100% Correct Answers

ARMRIT Physics Exam Guide [Reviewed Study Set] 100% Correct Answers The tissue characteristic that depends heavily on the relative content of fat molecules and free water is: *Ans* T1 effects An equation derived to predict the MR signal intensity of a particular tissue as a result of a spin-echo pulse sequence is the: *Ans* Larmor equation Which equation is true of the relaxation process? *Ans* Without the effects of T2 star, T2 decay continues The Process of relaxation begins when.. *Ans* B1 is turned off A sinewave is a symbol used to measure electromagnetic energy. A sinewave's two components of measure are: *Ans* Wavelength and frequency Once the net magnetization vector (NMV) has moved away from equilibrium the following will occur: *Ans* The transverse component will increase The main magnetic field of the MRI system is described as constant and always oriented in one set direction, either horizontal or vertical (dependent on type of magnet). The transmitted radio-frequency, in comparison, is described as: *Ans* Oscillating and always perpendicular to B0 When the net magnetization in the XY plane has ceased to exist the condition of the __ has been reached: *Ans* Equilibrium Following the RF excitation, as transverse magnetization (MXY) decays to zero, the MR signal: *Ans* Decays to zero An RF pulse transmitted with a strength and duration sufficient to flip the M vector from the Z axis to the XY plane is a: *Ans* 90 degree pulse An MR signal is generated when the net magnetization vector is: *Ans* Some value greater than zero in the XY plane RF pulses are identified according to the: *Ans* Flip angle and nutation Following the excitation pulse, the FID decays: *Ans* Exponentially The MR signal is strongest when the precessing nuclei are: *Ans* In phase coherenc