Welcome to your MRI - A Name [The diffusion of fluid thorough a semipeITI1eable membrane such as the wall of a living cell is known as _____.] Hydrosis Ionization Osmosis None of the above None . [Foldover artifact caused by undersampling of signal in the phase encoding direction is known as ______.] Phase wrap Frequency wrap Gibbs wrap None of the above None . [The chemical compounds used to bind the metallic ion in MRI contrast agents are known as _____.] Hydrophilies Chelates Macrophanges None of the above None . [At a field strength of 1.0 tesla, the approximate TI relaxation time for renal cortex tissue is] 180 ms 270ms 360ms 390ms None . [The area of K space filled with the shallowest phase encoding slopes is known as _______.] Central lines Outer lines Negative lines only None of the above None . [The number of times each signal is sampled with the same value of the phase encoding gradient is known as _______.] Number of signal averages Number of excitations Number of signal quotients All of the above None . [A volume element that has the same height, width, and depth is known as _______.] Rectangular Isotropic Triangular Anisotropic None . [At a field strength of 1.0 tesla, the approximate Tl relaxation time for muscle tissue is ______.] 270ms 480ms 600ms 680ms None . [Which of the following logical gradients is known as the phase encoding gradient?] X gradient Y gradient Z gradient None . [Which of the following patient injuries can be caused by improper placement of cardiac leads?] Patient bums Temporary hearing loss Short term memory loss None of the above None . [The artifact produced by the transfer of spin lattice energy from one slice to its adjacent slice is known as ______.] Wraparound artifact Ringing artifact Cross talk artifact Magnetic susceptibility None . [The inversion recovery pulse sequence that is used to suppress fat in a T1 weighted image is known as ______.] FLAIR STIR SSFP FLASH None . [When image matrix is decreased, spacial resolution _______.] Increases Decreases Stays the same None . [Chemical misregistration artifact most commonly occurs in which direction of the MR image?] Phase encoding direction Frequency encoding direction Slice selection direction None of the above None . [The P wave of the ECG represents which phase of the cardiac cycle?] Atrial systole Ventricular systole Ventricular diastole Atrial diastole None . [When a patient is placed in an external magnetic field, the number of unmatched hydrogen protons usually equals _______.] One billion One million Few per million Few per billion None . [In MRI, thick slices are achieved by applying a ______ gradient slope or a _______ bandwidth.] Shallow, Broad Steep, Narrow Shallow, Narrow None of the above None . [At a field strength of 1.0 tesla, the approximate T2 relaxation time for grey matter is ______.] 70ms 80ms 90ms lOOms None . [During cardiac gating, the waiting time between the R wave and the start of the data acquisition is known as ______.] Repetition time Inversion time Trigger delay Echo delay None . [The effects of entry slice phenomenon are dependent upon which factor( s)?] Repetition time Slice thickness Velocity offlow All of the above None . Time's up
