ARMRIT-Practice Test (Part 2: Mri Clinical Applications) with Complete Solutions.

Tissues that have low (short) relaxation times have: - ANSWER-High (long) relaxation rates Spatial resolution is an image quality factor determined by ________ and ________. - ANSWER-Slice thickness and pixel size Inversion time, In an inversion recovery pulse sequence, is the time interval between the: - ANSWER-180 and 90 degree pulses A complicated equation for predicting the MR signal intensity from a tissue subject to a spin-echo sequence is the: - ANSWER-Bloch Equation In a gradient echo pulse sequence, which flip angle will produce a T2 weighted gradient echo image? - ANSWER->20-<45 degrees The best technique for improving image quality is to increase: - ANSWER-NEX For the following spin-echo protocol: FOV 320/ TR:500/ TE:25/ Slice Thick:5mm/ Slice Gap:1 mm/ slice #9/ NEX:4/ matrix:192, increasing FOV, TE and slice interval will: - ANSWER-Not affect scan time In a horizontal field magnet, what is the primary Gs for a Sagittal slice? - ANSWER-Gx What pulse imaging technique is employed in all implementations of MRA? - ANSWER-Gradient Echo Who described the mathematical method for converting a time-varying signal into its frequency components, which are used to obtain positional information from the MR signal? - ANSWER-Jean-Baptiste - Joseph Fourier For the following spin-echo protocol: FOV 320/ TR:500/ TE:25/ Slice Thick:5mm/ Slice Gap:1 mm/ slice #9/ NEX:4/ matrix:192, increasing the FOV will: - ANSWER-Increase SNR Which parameter in a pulse sequence helps to prevent "cross Talk" between two adjacent images? - ANSWER-Slice Interval In spatial localization, which gradient is considered to be the "logical readout" gradient? - ANSWER-Gx Residual, undesirable gradient magnetic fields that persist for a variable time duration after the pulse of electricity from the gradient power supply is terminated are known as: - ANSWER-Eddy currents Information acquired when you increase or decrease the frequency of the RF pulse of the G's, causing the center of the excited plane to change with the center of the G's RF pulse is: - ANSWER-Slice Position When selecting only one slice at a time during a pulse sequence, which method for providing spatial localization is employed? - ANSWER-2DFT For the following spin-echo protocol: FOV 320/ TR:500/ TE:25/ Slice Thick:5mm/ Slice Gap:1 mm/ slice #9/ NEX:4/ matrix:192, Decreasing Matrix will: - ANSWER-Increase