Welcome to your MRI - A Name [Gadopentetate dimeglumine, also known as Magnevist, is based on what type of molecular structure?] Linear ionic Linear nonionic Macrocyclic ionic Macrocyclic nonionic None . [In a proton density weighted image, tissues with a high number of hydrogen nuclei appear ______.] Hyperintense Hypointense lsointense None of the above None . [Which of the following people won the 1952 Nobel Prize for their NMR research?] Felix Bloch I.I. Rabi Edward Purcell Both A and C None . [MRI contrast agents known as T2 agents produce what type of contrast on T2 weighted images?] Positive Negative 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 . [The method used to contain the main magnetic field within the scan room is known as _____.] Shimming Shielding Fringing None of the above None . [The flow phenomenon that is characterized by the contrast differences between fresh flowing nuclei entering a slice and stationary tissue within that slice is known as ______.] Time of flight phenomenon Entry slice phenomenon Intra-voxel dephasing None of the above None . [Which of the following is a method used in MRA to increase signal from vascular structures?] Gradient moment nulling Subtraction Bipolar gradient Both A and C 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 . [The process of adjusting coils to improve the homogeneity of the external magnetic field is known as _____.] Strengthening Fringing Shielding Shimming None . [At a field strength of 1.0 tesla, the approximate T1 relaxation time for grey matter is ______.] 390ms 450ms 520ms 620ms None . [When field of view decreases, spacial resolution _______.] Increases Decreases Stays the same None . [The pulse sequence that performs a series of 180 degree rephasing pulses and echos is known as ______.] Echo planar Inversion recovery Fast spin echo Conventional spin echo None . [The letters FID in an FID signal stand for _______.] Field image dimensions Free induction decay Field induction direction Free image direction None . [During cardiac gating, one R-R interval and a short TE is used to produce what type of image?] T1 weighting T2 weighting Proton density weighting None of the above None . [The word lodestone was derived from which of the following meanings?] Attraction To find one's way Heavy None of the above None . [The recommended whole body SAR limit for MR imaging is _____.] .4 Watts/kg 3.2 Watts/kg 8 Watts/kg 4.0 Watts/kg None . [Figure displays an example of what type of artifact?] Truncation Aliasing Cross excitation Chemical shift None Comment . [The nucleus of the hydrogen atom carries what type of charge?] Negative Neutral Positive None . [When field of view is increased, signal to noise ratio _______.] Increases Decreases Stays the same None . Time's up
