Welcome to your MRI - A Name [The artifact that appears as a low intensity band in areas of high intensity due to undersampling is known as ______.] Gibbs artifact Truncation artifact Ringing artifact All of the above None . [Chemical misregistration artifact is most likely to affect which type of pulse sequence?] Spin echo pulse sequences Inversion recovery pulse sequences Gradient echo pulse sequences None of the above None . [The amplitude of the phase and frequency encoding gradients determines the dimension of what parameter?] FOV TR TE NEX None . [When the phase encoding gradient is activated, medium slopes produce what type of signal amplitudes?] High Low Medium None of the above None . [Clinical MRI is based on the generation of signal from the nucleus of which atom?] Helium Nitrogen Oxygen Hydrogen None . [Hazards to patients and technologists due to ferromagnetic objects within the scan room include which of the following?] Metal projectiles Tissue bums Image artifacts None of the above None . [The Z gradient alters the magnetic field strength along which axis?] Horizontal axis Vertical axis Long axis Short axis 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 . [Which of the following is an example of an intra axial neoplasm?] Acoustic neuroma Meningioma Astrocytoma Both A and B None . [On a TI weighted image of the brain, white matter appears ______ to grey matter.] 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 . [Gadopentetate dimeglumine, also known as Magnevist, is based on what type of molecular structure?] Linear ionic Linear nonionic Macrocyclic ionic Macrocyclic nonionic None . [During slice selection, the Z gradient is used to select slices in which plane?] Coronal Axial Sagittal None of the above None . [During the sampling of signal, the sampling time is inversely proportional to ______.] Sampling rate Transmit bandwidth Receive bandwidth Both A and C None . [The process of adjusting coils to improve the homogeneity of the external magnetic field is known as _____.] Strengthening Fringing Shielding Shimming None . [What type of molecule makes up 50% to 90% of a person's total body weight?] Fat Oxygen Water Nitrogen None . [Metal implants within the body, depending on the location, can pose what type of problems during the MRI exam?] Torque Heating Artifacts All of the above None . [Shading artifact can be caused by what factor(s)?] Inhomogeneity of the external magnetic field Undersampling of phase encoding steps Inhomogeneity of the RF pulse Both A and C None . [An example of aperiodic motion is ______. ] Cardiac motion Flow motion Respiratory motion Peristalsis motion None . [Which imaging parameter affects the amount of chemical misregistration that will be seen on an image?] TR TI TE NEX None . Time's up
