ARMRIT practice tests questions and answers

ARMRIT practice tests questions and answers The 2 types of enhancement media described by Lauffer, the mechanism of T1 agents is - Ans ️️ -to decrease T1 relaxation time, thus emitting high signal An analogy for the decoding of the MR signal through Fourier Transform - Ans ️️ -Basilar membrane processing sound Logically each line of phase encoding data is combined to allow the FT to determine the position along the y-axis. The number of phase encoding steps determines - Ans ️️ -the number of pixels along the y-axis In a gradient echo pulse sequence, which flip angle will produce a T2 weighted gradient echo image. - Ans ️️ ->20 - <45 degree flip angle In a horizontal magnet, what is the primary Gs (slice select gradient) for an axial slice - Ans ️️ - Gz (axial slice) A linear relationship between frequency and position is superimposed on Bo by the Gp (phase encoding gradient). The Hydrogen protons relative precessional frequencies determine - Ans ️️ -phase shifts Combining a metal ion with a ligand reduces their tendency to bind to proteins, enzymes, or membranes. The degree to which they dissociate is a measure of their - Ans ️️ -toxicity In a phase sequence employing 2DFT, the time can be calculated using which formula - Ans ️️ -TR x NEX x Matrix What pulse imaging technique is in all implementations of MRA - Ans ️️ -gradient echo What year was the first MRI enhancement agent approved for clinical use - Ans ️️ -1988 Increasing NEX - Ans ️️ -Increase SNR and Resolution