New Quiz 19 Dec Welcome to your MRI - A Name [The first whole body MRl scanner used by Dr. Raymond Damadian was known as the _______.] Signa Gyroscan Indomitable Abominable None . [MRI images that are based on the differences in the amount of hydrogen nuclei in tissues are known as ______.] TI weighted images T2 weighted images Proton density weighted images Transitional images None . [Figure is a diagram showing what type of pulse sequence?] Partial saturation Spin echo Inversion recovery Gradient Echo None Comment . [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 . [Typical peak velocities of the middle and anterior cerebral arteries are usually within what range?] 150 - 175 cm/sec 100 - 150 cm/sec 40 - 70 cm/sec 30 - 50 cm/sec 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 . [In an MRI system, the magnetic field that extends outside the bore of the magnet is known as the _____.] Extended field Outer field Fringe field In field None . [To decrease the chances of cross excitation there should be at least what percentage of inters lice gap?] I0% 15% 30% 50% None . [Which imaging parameter affects the amount of chemical misregistration that will be seen on an image?] TR TI TE NEX None . [Which of the following people received the 1922 Nobel prize in physics for his theory of the atomic structure?] Michael Faraday Nikola Tesla Niels Bohr Otto Stem None . [Figure displays an example of what type of artifact?] Phase mismapping Aliasing Chemical shift Cross excitation None Comment . [Which of the following is the conventional technique used to produce a bright appearance in vascular structures?] Pre-saturation pulse Respiratory compensation Gradient moment nulling None of the above None . [When slice thickness is decreased, the effects of entry slice phenomenon] Increase Decrease Stay the same None . [Which method of image acquisition acquires data from an entire volume of tissue, then uses a method called slice encoding to separate the images?] Sequential 2D volumetric 3D volumetric None . [When bandwidth is increased, signal to noise ratio _______.] Increases Decreases Stays the same None . [Neoplasms of the spine that are outside the spinal cord and outside the CSF space are said to be located in which of the following locations?] Intramedullary Extramedullary Intradural Extradural None of the above None . [TOF MRA is most sensitive to blood flow that flows in what direction in relation to the slice?] Parallel Perpendicular None . [Which of the following ancillary staff should be trained in the safety procedures of the MRI department?] Janitorial staff Nursing staff MRI department clerical staff All of the above None . [The type of signal that is created after a gradient is used to refocus the dephasing net vector is known as _______.] Spin echo signal Gradient echo signal FID signal None of the above None . [The type of pulse sequence that uses a gradient instead of a 180 degree RF pulse to rephase dephasing nuclei is known as ______. ] Spin echo Inversion recovery Fast spin echo Gradient echo None . Time's up
