New Quiz 19 Dec Welcome to your MRI - A Name [Material that is strongly attracted to a magnetic field is said to be _______.] Electromagnetic Paramagnetic Ferromagnetic Diamagnetic None . [In a gradient echo pulse sequence, which parameter directly affects image weighting?] NEX Field of view Flip angle Matrix None . [Blood flow that has randomly different velocities is known as what type of flow?] Turbulent flow Laminar flow Vortex flow Stagnant flow None . [In clinical MRI, which of the following is an advantage of using a superconducting magnet?] High field strength Shorter scan times Low power consumption All of the above None . [Chemical shift artifact can be minimized by which of the following methods?] Minimizing the FOV Increasing the receive bandwidth Utilizing chemical saturation All of the above None . [The use of an additional gradient to correct the effects of intra-voxel dephasing is a technique known as ______.] Gradient moment rephasing Intra-voxel misregistration Gradient moment nulling Both A and C None . [Which of the following objects should not be permitted past the 5 gauss line?] Cardiac pacemaker Hearing aids Neuro stimulators All of the above None . [The spin of the proton of the hydrogen atom is known as _______.] Nuclear spin Axial momentum Hydraulic spin Angular momentum None . [The gradient that is turned on during the application of the 90 degree excitation pulse and the 180 degree RF pulse is known as ______.] Slice selection gradient Phase encoding gradient Frequency encoding gradient None of the above None . [Which of the following is a disadvantage of fast spin echo pulse sequences?] Increased effects of flow motion Bright fat on T2 weighted images Increased resolution Both A and B None . [The method that is most commonly used to reduce artifact produced by cardiac motion when scanning the chest is known as ______.] Respiratory gating Respiratory compensation Cardiac gating None of the above None . [The type of MRI magnet that ~lows the highest field strengths is a _____.] Resistive magnet Superconducting magnet Iron core magnet Permanent magnet None . [Magnetic susceptibility artifact is most prominent in what type of pulse sequence?] Spin echo Inversion recovery Gradient echo None of the above None . [As bandwidth increases, sampling time _______.] Increases Decreases Stays the same None . [Which of the following logical gradients is known as the slice selection gradient?] X gradient Y gradient Z gradient None . [Which of the following people named the ends of a magnet north and south poles?] Louis Faraday Alexander Necham Petrus Peregtinus de Maricourt Hans Christian None . [Which of the following is an example of an extra axial neoplasm?] Meningioma Astrocytoma Acoustic Neuroma Both A and C None . [Which of the following TOF MRA sequences is most likely to saturate slow flow?] 3D TOF 2D TOF None . [At a field strength of 1.0 tesla, the approximate Tl relaxation time for renal medulla tissue is ______.] 520ms 600ms 680ms 800 ms None . [Biological effects associated with exposure to static magnetic fields above 2 tesla include which of the following?] Fatigue Headaches Hypotension All of the above None . Time's up
