Welcome to your MRI - A Name [The magnitude of time of flight phenomenon effects is dependent upon which factor(s)?] Velocity of flow TE Slice thickness All of the above None . [Typical peak velocities of the ascending aorta are usually within what range?] 150 - 175 cm/sec 100 - 160 cm/sec 80 - 120 cm/sec 40 -70 cm/sec None . [The recommended SAR limit for safely imaging small volumes is _____.] .4 Watts/kg 3.2 Watts/kg 8 Watts/kg 4.0 Watts/kg None . [The ratio that describes the constant at which any magnetic nucleus will precess in a 1 tesla magnet is known as _______.] Precessional ratio Magnetogyric ratio Gyromagnetic ratio Both B and C None . [The three primary functions that gradients perform during MR scanning are ______.] Slice selection, RF application, Frequency encoding Phase encoding, Frequency encoding, RF application Slice selection, Phase encoding, Frequency encoding None of the above None . [Which of the following is an advantage of a fast spin echo pulse sequence?] Reduced scan times Improved quality Increased T2 weighting All of the above None . [Noise that degrades image quality in a specific location within an MRI image is known as _______.] Inherent noise interference Random noise interference Discrete noise interference None of the above None . [The area within the array processor where spatially located information is stored is known as _______.] Interspace Array space Fourier space K space None . [The ability to distinguish one structure from another on an image is known as ______.] Spatial resolution Contrast to noise Signal to noise None of the above None . [To produce signal in a spin echo pulse sequence, blood flow must receive both the 90 degree and the 180 degree RF pulse.] True False None . [The first magnetic resonance experiments with solids were conducted by a group of scientists from Harvard University led by which of the following people?] Felix Bloch Edward Purcell Otto Stem Paul Lauterbur None . [The device in the MRI system that supplies power to the RF transmitter coils is known as the _____.] Array processor RF amplifier Gradient amplifier None of the above None . [On a proton density weighted image of the brain, white matter appears ______ to grey matter.] Hyperintense Hypointense Isointense None . [The frequency encoding gradient is also known as the ______ because it is turned on during the sampling of signal.] Refocusing gradient Spoiler gradient Readout gradient Phase encoding gradient None . [Which of the following is an advantage of gradient echo pulse sequences?] Decreased scan time Increased sensitivity to flow Volume acquisitions possible All of the above None . [Typical peak velocities of the proximal carotid, brachial and superficial femoral arteries are usually within what range?] 150 - 175 cm/sec 100 - 160 cm/sec 80 - 120 cm/sec 40 -70 cm/sec None . [A volume element that has the same height, width, and depth is known as _______.] Rectangular Isotropic Triangular Anisotropic None . [The Z gradient alters the magnetic field strength along which axis?] Horizontal axis Vertical axis Long axis Short axis None . [Gadoterate meglumine, also known as Dotarem, is based on what type of molecular structure?] Linear ionic Linear nonionic Macrocyclic ionic Macrocyclic nonionic None . [During the acquisition of axial images of the body with the frequency direction L/R, phase encoding is performed by which physical gradient?] X gradient Y gradient Z gradient None of the above None . Time's up
