Welcome to your MRI - A Name [The artifact that is caused by the phase differences between fat and water is known as ______.] Chemical shift Phase wrap Chemical misregistration Ringing None . [The type of magnet that is produced by passing an electrical current through a conductor is known as a ________.] Permanent magnet Resistive magnet Electromagnet Both B and C None . [The osmolality of a contrast agent is measured in what unit?] Osmoles per kilogram of water (Osm/kg) Milliosmoles per kilogram of water (mOsm/kg) Milliliters per kiloliter (ml/kl) Both A and B None . [In clinical MRI, what method is used to prevent external radio frequency from affecting the MRI image?] Copper shielded room Iron shielded magnet Passive shimming None of the above None . [An artifact caused by faulty receiver attenuation settings during prescan is known as ______.] Herringbone Shading Data clipping Aliasing None . [Figure displays an example of what type of artifact?] Ringing Phase wrap Chemical shift Cross talk None Comment . [On a proton density weighted image of the brain, white matter appears ______ to grey matter.] Hyperintense Hypointense Isointense None . [Which of the following PC MRA techniques provides the highest signal to noise ratio and spacial resolution?] 2D PC MRA 3D PC MRA None . [Which of the following is aprecaution for the use of gadolinium?] Patients with sickle cell anemia Patients with a history of grand mal seizures Patients with a history of asthma All of the above None . [The smaller the net magnetic vector in the transverse plane the_______ the signal that is produce] Larger Stronger Weaker None of the above None . [The device in the MRI system that supplies power to the RF transmitter coils is known as the _____.] Array processor RF amplifier Gradient amplifier None of the above 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 high velocities in the center of the vessel but spirals near walls of a vessel due to a stricture is known as what type of flow?] Turbulent flow Laminar flow Vortex flow Stagnant flow None . [To produce signal in a spin echo pulse sequence, blood flow must receive both the 90 degree and the 180 degree RF pulse.] True False None . [Scientist Paul Lauterbur described an NMR imaging technique called] Magnetography Positron Tomography Zeugmatography Computed Tomography None . [The method of MRI field containment that uses steel lining in the walls of the magnetic room is known as _____.] Active shimming Passive shielding Active shielding Passive shimming None . [Which of the following is a method used in MRA to suppress stationary tissue?] Tissue subtraction Tissue saturation Gradient moment nulling Both A and B None . [Gadopentetate dimeglumine, also known as Magnevist, is based on what type of molecular structure?] Linear ionic Linear nonionic Macrocyclic ionic Macrocyclic nonionic None . [Phase mismapping artifact caused by respiratory motion can be decreased by which method?] Presaturation pulse Swapping phase and frequency direction Respiratory compensation All of the above None . [During cardiac gating, one R-R interval and a short TE is used to produce what type of image?] T1 weighting T2 weighting Proton density weighting None of the above None . Time's up
