ARMRIT Practice Test Part 2 Clinical Applications Correct 100%

For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix:192 Decreasing TE will: a. Decrease the # of allowable slices. b. Increase the # of allowable slices. c. Increase scan time. d. Decrease scan time. - Answer b. Increase the # of allowable slices. A linear relationship between frequency and position is superimposed on Bo by the Gp. The H protons' relative precessional frequencies determine: a. Phase coherence. b. Phase encoding. c. Phase shifts. d. Rephasing - Answer c. Phase shifts. For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix:192 Increasing the FOV will: a. Increase SNR. b. Decrease SNR. c. Decrease Matrix. - Answer a. Increase SNR A gradient is employed exposing the patient's body to a series of increasing or decreasing magnetic field strengths for slice selection. In what relation to the slice is this gradient? a. Anti-parallel. b. Perpendicular. c. Parallel. d. Oblique. - Answer b. Perpendicular. In spatial localization, the "logical" Slice Selection Gradient is symbolized: a. Gz b. Gy c. Gx - Answer a. Gz The "best" technique for improving image quality is to increase: a. TR b. NEX c. Matrix d. FOV - Answer b. NEX The two types of enhancement media, described by Lauffer, the mechanism of T2 agents is: a. To increase T2 relaxation time, thus emitting low signal. b. To decrease T2 relaxation time, thus emitting low signal. c. To increase T2 relaxation time, thus emitting high signal. d. To decrease T2 relaxation time, thus emitting high signal - Answer b. To decrease T2 relaxation time, thus emitting low signal. The number (#) of slices formula is: a. TR x TE x delta. b. TR + TE + delta. c. TR / (TE+delta). - Answer c. TR / (TE+delta). A generation of frequency differences along a particular direction of a slice is called: a. Frequency encoding. b. Fourier transform. c. Phase encoding. d. Slice selection. - Answer a. Frequency encoding.