Welcome to your MRI - A Name [In a T2 weighted image, tissues with short T2 relaxation times appear ______.] Hyperintense Hypointense Isointense None of the above None . [Which of the following is the pulse sequence that is used most commonly?] Inversion recovery Gradient echo Spin echo Echo planar None . [The type of pulse sequence that fills all lines of K space per TR is known as ______.] Fast spin echo Steady state free precession Echo planar Spin echo None . [The force on a ferromagnetic object placed in a magnetic field is dependent upon which of the following factors?] The mass of the object The distance from the magnet The object's orientation to the magnet All 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 . [The term used to describe a picture element is known as a _______.] Image element Pixel Voxel Volume element None . [The higher the number of excitations that are acquired the more K space that is filled.] True False None . [Neoplasms within the spinal cord are said to be located in which of the following locations?] Intramedullary Extramedullary Intradural Extradural None of the above None . [The number of picture elements used to make up an image is known as _______.] Contrast Matrix Signal to noise None of the above None . [On a TI weighted image of the brain, grey matter appears to CSF.] Hyperintense Hypointense Isointense None . [The homogeneity of the external magnetic field is measured in what type of unit?] Tesla per centimeter Part per million Gauss per meter Megahertz 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 . [Blood flow velocity is measured in what type of unit?] Gauss/sec mm.lsec cm.lsec inches/sec None . [In clinical MRI, superconducting magnets usually operate at field strengths from _____.] .15 to .3 tesla .5 to 2.0 tesla 2.5 to 4.0 tesla Over 4 tesla 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 . [Gadodiamide, also known as Omniscan, is based on what type of molecular structure?] Linear ionic Linear nonionic Macrocyclic ionic Macrocyclic nonionic None . [The type of shimming that is achieved by adjusting the electrical current in specialized coils is known as _____.] Passive shimming Passive shielding Active shimming Active shielding None . [In a gradient echo pulse sequence, the process of reversing the slope of the phase encoding gradient after readout to preserve residual transverse magnetization is known as ______. ] Warping Spoiling Rewinding None of the above None . [The wire used in the main magnetic field of a superconducting magnet has its resistance removed by cooling it to a temperature of _____.] -452 degrees Fahrenheit 0 degrees Celsius 269 degrees Kelvin None of the above None . [The type of RF coil configuration that is used to image anatomical structures close to the surface of the patient is known as a _____.] Surface coil Quadrature coil Phased array coil Shim coil None . Time's up
