ARMRIT- Clinical Application Test Questions and Answers with Verified Solutions 2024 Graded A

A technique to avoid "cross-talk"? - Interleaving Combining a metal ion with ligand reduces tendency to bind to proteins, enzymes or membranes. The degree to which they dissociate is a measure of their? - Toxicity The "best" technique for improving image quality is to increase? - NEX Tissues that have low (short) relaxation times have? - High (long) relaxation rates Linear relationship between frequency and position is superimposed on Bo by the Gp. The hydrogen protons relative precessional frequencies determine? - Phase shifts What is the pixel formula? - FOV/Matrix An analogy for decoding the MR signal through Fourier Transform? - Basilar membrane processing sound Decreasing Matrix will? - Decrease pixel size Spatial resolution is an image quality factor determined by? - Slice thickness and pixel size Inversion time, in Inversion Recovery pule sequence is the interval between? - 180 and 90 degree pulses Decreasing TE will? - Increase # of slices The least expensive parameter in time, of the following that affect time, to increase for improving image quality is? - TR FLAIR stands for? - Fluid Attenuated Inversion Recovery In a horizontal field magnet, what is primary Gs for Axial slice? - Gz A pulse sequence that replaces the second RF pulse with gradient magnet field to rephase the transverse vector and produce an echo is called? - Gradient Echo In spatial localization, which gradient is considered to be "logical"/"read-out"? - Gx Increasing Matrix will? - Increase in resolution In IR pulse sequence, what will produce a STIR fat supression? - 80-120 range Decreasing NEX will? - Decrease SNR and Resolution A generation of frequency differences along a particular direction of a slice is called? - Frequency encoding When increasing the parameter, matrix, the pixel size will? - Decrease Increasing NEX will? - Increase SNR and Resolution Information acquired when you increase/decrease frequency of the RF pulse of Gs, causing the center of tyhe excited plane to change with the center of Gs RF pulse is? - Slice position Gadolinium..? - Produces randomly fluctuating magnetic fields in its immediate environment