Welcome to your MRI - A Name [The spacial location of signal according to its precessional phase is known as ______.] Slice selection Phase encoding Frequency encoding Readout None . [Volume averaging artifact can be reduced by which of the following methods?] Increasing slice thickness Decreasing slice thickness Increasing NEX Decreasing NEX None . [An example of phase mismapping artifact is ______. ] Cardiac motion Flow motion Respiratory motion All of the above None . [The magnetic properties of the nucleus of atoms were discovered in 1924 by which of the following people?] Edward Purcell Raymond Damadian Joseph Henry Wolfgang Pauli None . [In a gradient echo pulse sequence, the use of an RF pulse to eliminate residual transverse magnetization is known as ______.] Digital RF spoiling Frequency spoiling Gradient spoiling None of the above None . [Chemical misregistration artifact most commonly occurs in which direction of the MR image?] Phase encoding direction Frequency encoding direction Slice selection direction None of the above None . [The return of longitudinal magnetization to equilibrium is known as _______.] T I relaxation Spin-Lattice relaxation Longitudinal relaxation All of the above None . [When the proper radio frequency is applied, the precessing hydrogen nuclei begin to _______.] Dephase Rephase Relax Resonate None . [Wraparound artifact caused by undersampling of frequencies in the readout direction is known as ______.] Phase wrap Frequency wrap Gibbs wrap Truncation None . [Which of the following is a disadvantage of using a permanent magnet in clinical MRI?] Low fringe field Low operating cost Low field strength Both A and B None . [The artifact that is caused by the phase differences between fat and water is known as ______.] Chemical shift Phase wrap Chemical misregistration Ringing None . [Gradient echo pulse sequences that preserve left over transverse magnetization are said to be ______. ] Incoherent Coherent Consistent Inconsistent None . [Noise that generally degrades overall quality of an MRI image is known as _______.] Inherent noise interference Random noise interference Discrete noise interference None of the above None . [At a field strength of 1.0 tesla, the approximate Tl relaxation time for renal medulla tissue is ______.] 520ms 600ms 680ms 800 ms None . [Which of the following patients should be absolutely excluded from having an MRI exam?] Patients with hip replacements Patients with titanium aneurysm clips Patients with cardiac pacemakers Patients with cornea implants None . [Blood flow velocity at a given point is dependent upon which factor?] Patient sex Phase of patient's cardiac cycle Patient's weight None of the above None . [At a field strength of 1.0 tesla, the approximate Tl relaxation time for blood is ______.] 540ms 680 ms 800 ms 1000 ms None . [Figure is a diagram showing what type of pulse sequence?] Partial saturation Spin echo Inversion recovery Gradient echo None Comment . [In conventional spin echo pulse sequences, how many lines of K space are filled per TR?] 1 2 4 6 None . [The first intravenous MRI contrast agent that was used on a human subject was known as _____.] Niobium-Titanium Ferric Chloride Ferric Nitrate Gadopentetate dimeglumine None . Time's up
