New Quiz 19 Dec Welcome to your MRI - A Name [Motion artifact on an MR image caused by flowing blood or CSF can be decreased by which of the following methods?] Respiratory compensation Patient education Gradient moment nulling Respiratory gating None . [Three types of ferromagnetic material are _______.] Copper, Titanium, Aluminum Iron, Cobalt, Nickel Bronze, Niobium, Tin None of the above None . [The device used to store and transport cryogenic liquids is known as a _____.] Thermos Dewar Barrel None of the above None . [Blood flow velocity is greatest near which area of the vessel?] Vessel walls Vessel center None of the above None . [Material that is strongly attracted to a magnetic field is said to be _______.] Electromagnetic Paramagnetic Ferromagnetic Diamagnetic 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 . [Isolating the RF transmitter from the RF receiver is known as _____.] Deisolation Isolation Coupling Decoupling None . [The type of neoplasms in the head that enhance primarily due to the breakdown of the blood brain barrier are known as _____.] Intra axial neoplasms Extra axial neoplasms Acoustic neuromas None of the above None . [Contrast agents presently used in MRI have what type of effect on tissue?] Increase T2 relaxation times Decrease TI relaxation times Increase TI relaxation times None of the above None . [Blood flow that travels in the opposite direction in which the slices are acquired is known as what type of flow?] Counter current flow Vortex flow Stagnant flow Co-current flow 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 . [Which of the following conventional MR1 techniques can be used to produce contrast differences between vascular structures and stationary structures?] Gradient moment nulling Respiratory compensation Pre-saturation pulse Both A and C None . [Foldover artifact in the phase direction can be corrected by which of the following methods?] Oversampling signal outside the FOV Increasing the FOV Using saturation pulses outside the FOV All of the above None . [In a gradient echo pulse sequence, the process of reversing the slope of the phase encoding gradient after readout to preserve residual transverse magnetization is known as ______. ] Warping Spoiling Rewinding None of the above None . [At a field strength of 1.0 tesla, the approximate T2 relaxation time for blood is ______.] 140ms 180 ms 240ms 300ms None . [The amount of a drug required to cause death in half of a sample of laboratory mice is known as _____.] LD50 LR50 Median lethal dose Both A and C None . [The wire used to create the main magnetic field in a superconducting magnet is known as ________.] Aluminum-Tiobium Iron Sulfite Copper-Tungsten Niobium-Titanium None . [The type of cardiac gating that detects the increase in blood volume in the capillary bed during systole is known as ______.] ECG gating Pseudo gating Peripheral gating None of the above None . [Materials reach their highest magnetic potential when their atoms are grouped in areas known as _______.] Regions Fields Fringes Domains None . [Contrast agents that separate into charged ions in water are said to be _____.] Hydrophobic Nonionic Ionic None of the above None . Time's up
