Welcome to your MRI - A Name [In MR imaging, slice thickness is determined by which factor(s)?] Magnet field strength Gradient slope slice select Transmit bandwidth Both Band C None . [Two types of cardiac gating that are most commonly used are known as______.] Respiratory gating, Respiratory compensation ECG gating, Peripheral gating Pseudo gating, Respiratory gating None of the above None . [In an echo planar pulse sequence, proton density weighting can be produced by which of the following techniques?] Applying a 180 degree RF pulse to pre-invert tissue before excitation Using a short TE Using a long TE Using a 180 degree rephasing pulse None . [When bandwidth is increased, signal to noise ratio _______.] Increases Decreases Stays the same None . [The process that uses mathematical conversions to calculate the amplitude of individual frequencies is known as _______.] Fast Fourier transfonnation Free induction decay Larmor equation None of the above None . [As blood flow velocity increases, the effects of time of flight phenomenon] Increase Decrease Stay the same None . [Magnetic susceptibility artifact is most prominent in what type of pulse sequence?] Spin echo Inversion recovery Gradient echo None of the above None . [The vascular imaging method that maximizes vascular contrast while also suppressing stationary tissue is known as ______.] Magnetic resonance mammography Magnetic resonance angiography Black Blood imaging Zeugmatography None . [The type of RF coil configuration that uses a pair of coils perpendicular to each other to transmit and receive signal is known as a _____.] Surface coil Phased array coil Quadrature coil Shim coil None . [When the amplitude of the phase encoding gradient increases, the amount of phase shift along the gradient _______.] Increases Decreases Stays the same None of the above None . [In conventional spin echo pulse sequences, how many lines of K space are filled per TR?] 1 2 4 6 None . [At .5 tesla, to reduce chemical misregistration artifact, the TE should be a multiple of what time?] 3.1 ms 4.2 ms 6.6ms 7.0 ms None . [Bright pixels on an MRI image represent what type of signal?] Low High Weak None of the above None . [What type of molecule makes up 50% to 90% of a person's total body weight?] Fat Oxygen Water Nitrogen None . [Biological effects associated with exposure to static magnetic fields above 2 tesla include which of the following?] Fatigue Headaches Hypotension All of the above None . [The higher the number of excitations that are acquired the more K space that is filled.] True False None . [With the parameters given, which protocol gives the highest signal to noise ratio?] Long TR/Short TE/ High matrix Short TR/Long TE/ Low matrix Long TR/Long TE/High matrix Long TR/Short TE/Low matrix None . [Figure is a diagram showing what type of pulse sequence?] Partial saturation Spin echo Inversion recovery Gradient echo None Comment . [After being placed in an external magnetic field, low energy hydrogen nuclei point in which direction?] Parallel Anti-paired Anti-parallel Perpendicular None . [In a proton density weighted image, tissues with a low number of hydrogen nuclei appear ______.] Hyperintense Hypointense Isointense None of the above None . Time's up
