Welcome to your MRI - A Name [In an echo planar pulse sequence, pre-inverting tissue with a 180 degree RF pulse before excitation produces what type of image weighting?] TI weighting T2 weighting Proton density weighting None of the above None . [Biological effects associated with exposure to radio frequency include which of the following?] Induction of electrical currents in tissue Heating due to tissue resistance Radiation poisoning Both A and B None . [Dephasing of the net vector in the transverse plane is caused by two factors, imperfections in the external magnetic field and _______.] The application of the 180 degree RF pulse The application of a 90 degree RF pulse Interaction between surrounding nuclei None of the above None . [Aliasing artifact in the frequency direction can be corrected by which of the following methods?] Decreasing the FOV Increasing the matrix Filtering the frequencies outside the FOV in the phase direction Filtering the frequencies outside the FOV in the frequency direction None . [An example of aperiodic motion is ______. ] Cardiac motion Flow motion Respiratory motion Peristalsis motion None . [Which of the following is a disadvantage of a gradient echo pulse sequence?] Decreased signal to noise ratio Increased sensitivity to magnetic susceptibility artifacts Increased gradient noise All of the above None . [The computer that performs the complex calculations necessary to reconstruct MRI images is known as the _____.] Array processor RF amplifier Gradient amplifier Shim cabinet None . [Metal in the patient, in the area that is being scanned, will most likely create what type of artifact?] Foldover artifact Chemical shift artifact Truncation artifact Magnetic susceptability None . [An artifact caused by faulty receiver attenuation settings during prescan is known as ______.] Herringbone Shading Data clipping Aliasing None . [Neoplasms outside the spinal cord but within the CSF space are said to be located in which of the following locations?] Intramedullary Extramedullary Intradural Extradural None of the above None . [Which of the following people developed the complex mathematical formulas used in MRI to reconstruct signals into images?] Michael Faraday Nikola Tesla Niels Bohr Jean Baptiste Joseph Fourier None . [Magnetic susceptibility artifact can be used to help diagnose what pathology?] Tom meniscus Herniated nucleus pulposis Pituitary adenoma Hemorrhage None . [In a T2 weighted image, tissues with long T2 relaxation times appear ______.] Hyperintense Hypointense lsointense None of the above None . [On a proton density weighted image of the brain, white matter appears ______ to grey matter.] Hyperintense Hypointense Isointense None . [Data loss due to gradient instability, excessive noise, or tuning errors can cause an artifact with what type of appearance?] Zippering Shading Staring Herringbone None . [In a TI weighted image, a short TR is used to ______.] Maximize T2 effects Minimize T2 effects Maximize TI effects Minimize TI effects None . [With the exception of hydrogen, all matter is composed of three components. They are _______.] Electrons, Photons, Protons Electrons, Neutrons, Photons Protons, Neutrons, Photons Neutrons, Electrons, Protons None . [The law that is used to determine the amount of resistance in a conductor is known as ________.] Newton's Law Ohm's Law Faraday's Law Murphy's Law None . [The artifact that is produced when anatomy that is outside the FOV is mapped within the FOV is known as ______.] Phase mismapping Aliasing Partial volume averaging Magnetic susceptibility None . [Metal implants within the body, depending on the location, can pose what type of problems during the MRI exam?] Torque Heating Artifacts All of the above None . Time's up
