ARMRIT Practice test Questions And Answers Rated A+ New Update Assured Satisfaction

Magnetism can be defined as the ability of certain substances to attract: - Answer-Iron, Cobalt, Nickel The components of the Gyro-magnetic ratio are: - Answer-Magnetic moment to angular momentum Which type of electromagnetic coils produce smaller magnetic field which allow spatial localization to be performed? - Answer-Gradient coils Which type of MRI magnet requires cryogen to cool magnetic coils to 4 degrees Kelvin? - AnswerSuperconductive T2 is the measurement of time for the transverse component of the net magnetization vector to decrease what percentage of its maximum value after the application of a 90 degree radio frequency pulse: - Answer-37% Which cryogenic material can produce temperature as low as 4 degrees Kelvin? - Answer-Liquid Helium The T1 process is also known as - Answer-Spin-Lattice a 90 degree radio-frequency pulse will alter the net magnetization vector. Another effect is: - AnswerThe hydrogen protons will have phase coherence. Which type of MRI magnet requires no electricity to maintain its magnetic field and can weigh from 18,000 lb. to 200,000 lb.? - Answer-Permanent To describe the uniformity of the MRI system's main magnetic field, the term employed is - AnswerHomogeneity The purpose of magnetic resonance angiography is to image the - Answer-Blood Flow Magnetic Resonance Imaging is derived from the process known as: - Answer-Nuclear Magnetic resonanceThe introduction of gadolinium based contrast enhancement agents by Intra-venous injection can involve passing through an abnormal blood brain barrier. The tissue compartments involved are the: - Answer-Intravascular to interstitial In a pulse sequence, transmitting an initial 90 degree radio-frequency pulse will cause the net magnetization vector to: - Answer-Shift in both size and direction. Which statement is true of the relaxation process? - Answer-Without the effects of T2 star, T2 decay continues. Which molecule precesses closer to the Larmor frequency? - Answer-Fat