Welcome to your MRI - A Name [The device used to store and transport cryogenic liquids is known as a _____.] Thermos Dewar Barrel None of the above None . [As bandwidth decreases, sampling time _______.] Increases Decreases Stays the same None . [In biological tissue, which type of relaxation occurs the quickest?] T2 relaxation T2* relaxation TI relaxation None of the above None . [The equation that is used to determine the precessional frequency of magnetic nuclei is known as _______.] Faraday's equation Fast Fourier transformations Damadian's equation Larmor equation None . [The effects of entry slice phenomenon are dependent upon which factor( s)?] Repetition time Slice thickness Velocity offlow All of the above None . [The type of shimming that is achieved by placing a ferrous material around the main magnet is known as _____.] Passive shimming Passive shielding Active shimming Active shielding None . [For centuries, sailors used magnets for which of the following purposes?] Lift heavy objects Navigate the seas Pull up anchors None of the above None . [An example of phase mismapping artifact is ______. ] Cardiac motion Flow motion Respiratory motion All of the above None . [Cross excitation artifact can be eliminated by which of the following methods?] Increasing interslice gap Using a sinc RF pulse Interleaving All of the above None . [During cardiac gating, which factors are affected by having an effective TR?] Image weighting Number of slices Scan time All of the above None . [As blood flow velocity increases, the effects of time of flight phenomenon] Increase Decrease Stay the same None . [An example of aperiodic motion is ______. ] Cardiac motion Flow motion Respiratory motion Peristalsis motion None . [When slice thickness is increased, signal to noise ratio _______.] Increases Decreases Stays the same None . [The time it takes for transverse magnetization to decay to 37% of its original value is known as _______.] T 1 relaxation time T2 relaxation time T2* relaxation time None . [At a field strength of 1.0 tesla, the approximate T2 relaxation time of fat is] 40 ms 50 ms 80 ms 90 ms None . [When TR is increased, the effects of entry slice phenomenon ______. ] Increase Decrease Stay the same None . [Figure displays which type of relaxation curve?] T 1 relaxation curve T2 relaxation curve Inversion recovery curve None Comment . [Which of the following is aprecaution for the use of gadolinium?] Patients with sickle cell anemia Patients with a history of grand mal seizures Patients with a history of asthma All of the above 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 . [Magnetization in the transverse plane can also be known as _______.] Mz Mxy Mo Both B and C None . Time's up
