ARMRIT Practice Exam Part 2: Clinical Applications - MRI Principles and Techniques, Exams of Advanced Education

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ARMRIT Practice Exam Part 2 Clinical

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For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix: Decreasing TE will: a. Decrease the # of allowable slices. b. Increase the # of allowable slices. c. Increase scan time. d. Decrease scan time. - Correct 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 - Correct 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: Increasing the FOV will: a. Increase SNR. b. Decrease SNR. c. Decrease Matrix. - Correct 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. - Correct Answer-b. Perpendicular. In spatial localization, the "logical" Slice Selection Gradient is symbolized: a. Gz b. Gy c. Gx - Correct Answer-a. Gz The "best" technique for improving image quality is to increase: a. TR

b. NEX c. Matrix d. FOV - Correct Answer-b. NEX The two types of enhancement media, described by Lauffer, the mechanism of T 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 - Correct 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). - Correct 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. - Correct Answer-a. Frequency encoding. Using the following protocol, determine the scan time for this pulse sequence: (round off your answer to the nearest minute.) FOV: 320mm, TR: 2000ms, TE 20/80ms, NEX: 1, Matrix: 256x a. 3 mins. b. 4 mins. c. 6 mins. d. 12 mins. - Correct Answer-b. 4 mins. What pulse imaging technique is employed in all implementations of MRA? a. Spin-echo. b. STIR. c. Gradient-echo. d. FLAIR. - Correct Answer-c. Gradient-echo. In a horizontal field magnet, what is the primary Gs for a Sagittal Slice? a. Gx b. Gy c. Gz - Correct Answer-a. Gx When selecting a volume of slices, which method for providing spatial encoding is employed? a. 3DFT. b. FFT.

a. The # of voxels along the Y-axis. b. The # of pixels along the X-axis. c. The # of voxels along the X-axis. d. The # of pixels along the Y-axis. - Correct Answer-d. The # of pixels along the Y-axis. Which parameter in a pulse sequence helps to prevent "crosstalk" between two adjacent images? a. Matrix b. FOV c. NEX d. slice interval - Correct Answer-d. slice interval 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? a. Raymond Damadian. b. Felix Bloch. c. Jean-Baptiste-Joseph Fourier. d. Paul Lauterbur. - Correct Answer-c. Jean-Baptiste-Joseph Fourier. Using the following protocol, determine the scan time for this pulse sequence: (round off your answer to the nearest minute.) FOV: 400mm, TR: 750ms, TE: 20ms, NEX: 3, Matrix: 256 x 160 a. 2 mins. b. 4 mins. c. 6 mins. d. 8 mins. - Correct Answer-c. 6 mins. An Inversion Recovery pulse sequence can be which of the following: a. T1 weighted b. Water suppressed c. Fat suppressed d. All - Correct Answer-d. All For the following spin-echo protocol: FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4, Matrix: Increasing TE will: a. Decrease SNR and decrease Slice#. b. Increase SNR and increase Slice#. c. Increase scan time. d. Decrease scan time. - Correct Answer-a. Decrease SNR and decrease Slice#. What year was the first MRI enhancement agent approved for clinical use? a. 1988 b. 1946

c. 1973 d. 1981 - Correct Answer-a. 1988 Which is a normally enhancing structure after the administration of MRI I.V. gadolinium? a. Intervertebral disc. b. Choroid plexus. c. Cerebellum. d. Auditory nerves. - Correct Answer-b. Choroid plexus. MRA stands for: a. Magnetic Resonance Alignment. b. Magnetic Resonance Assessment. c. Magnetic Resonance Angiography. d. Magnetic Resonance Angioplasty. - Correct Answer-c. Magnetic Resonance Angiography. Which of the following parameter settings best describes a proton density image? a. Short TR/ short TE b. long TR/ long TE c. Short TR/ long TE d. long TR/ short TE - Correct Answer-d. long TR/ short TE In spatial localization, the "logical" phase encoding gradient is symbolized? a. Gz b. Gy c. Gx - Correct Answer-b. Gy