New Quiz 19 Dec Welcome to your MRI - A Name [The type of RF coil configuration that uses a series of independent coils to create one image is known as a _____.] Surface coil Phased array coil Quadrature coil Gradient coil None . [During cardiac gating, TR is dependent upon which factor(s)?] The patient's heart rate The R- R interval The Q - R interval Both A and B None . [Material that is strongly attracted to a magnetic field is said to be _______.] Electromagnetic Paramagnetic Ferromagnetic Diamagnetic None . [Clinical MRI is based on the generation of signal from the nucleus of which atom?] Helium Nitrogen Oxygen Hydrogen None . [Which of the following types of MRI magnet is known as the Classical electromagnet?] Resistive magnet Superconducting magnet Permanent magnet Distractive magnet None . [Figure is a diagram showing what type of pulse sequence?] Partial saturation Spin echo Inversion recovery Gradient echo None Comment . [Typical peak velocities of the ascending aorta are usually within what range?] 150 - 175 cm/sec 100 - 160 cm/sec 80 - 120 cm/sec 40 -70 cm/sec None . [Scientist Paul Lauterbur described an NMR imaging technique called] Magnetography Positron Tomography Zeugmatography Computed Tomography None . [The precessional frequency of hydrogen nuclei that experience decreased magnetic field strength due to gradient coils ______.] Increases Decreases Stays the same None . [Gradient moment nulling is most effective in reducing flow related motion in which type of flow?] Slow flow Fast flow Inplane flow Both A and C None . [Which of the following is a method of eliminating residual transverse magnetization?] Digital RF spoiling Gradient rewinding Gradient spoiling Both A and C None . [In a gradient echo pulse sequence, transverse magnetization that is leftover from a previous excitation pulse is known as ______. ] Residual transverse magnetization Magnetization transfer Chemical misregistration None of the above None . [The device in the MRI system that supplies power to the gradient coils is known as the _____.] Array processor RF amplifier Gradient amplifier None of the above 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 . [The X gradient alters the magnetic field strength along which axis?] Horizontal axis Vertical axis Long axis Short axis None . [During an inversion recovery pulse sequence, the time between the 180 degree inversion pulse and the 90 degree excitation pulse is known as ______. ] Echo time Repetition time Inversion time Reversion time None . [An example of phase mismapping artifact is ______. ] Cardiac motion Flow motion Respiratory motion All of the above None . [On a TI weighted image of the brain, CSF appears to fat.] Hyperintense Hypointense Isointense None . [Blood flow that has randomly different velocities is known as what type of flow?] Turbulent flow Laminar flow Vortex flow Stagnant flow None . [Wraparound artifact occurs in which direction of an MR image?] Phase direction Frequency direction Slice selection direction Both A and B None . Time's up
