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ARMRIT PRACTICE TEST PART 2: CLINICAL APPLICATIONS
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ARMRIT PRACTICE TEST PART 2: CLINICAL APPLICATIONS
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ARMRIT PRACTICE TEST PART 2: CLINICALAPPLICATIONS
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. - Answers-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 - Answers-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. - Answers-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. - Answers-b. Perpendicular.
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: 256x128
a. 3 mins.
b. 4 mins.
c. 6 mins.
d. 12 mins. - Answers-b. 4 mins.
What pulse imaging technique is employed in all implementations of MRA?
, a. Spin-echo.
b. STIR.
c. Gradient-echo.
d. FLAIR. - Answers-c. Gradient-echo.
In a horizontal field magnet, what is the primary Gs for a Sagittal Slice?
a. Gx
b. Gy
c. Gz - Answers-a. Gx
When selecting a volume of slices, which method for providing spatial encoding is
employed?
a. 3DFT.
b. FFT.
c. FT.
d. 2DFT. - Answers-a. 3DFT.
Spatial Resolution is an image quality factor determined by _________ and
__________.
a. field strength/receiver b. coil
c. flip angle/TE
d. TR/NEX
e. slice thickness/pixel size - Answers-e. slice thickness/pixel size
The purpose of the first use of metal ions in MRI enhancement, like gadolinium, is to:
a. Increase relaxation time for H in tissue.
b. Decrease relaxation time for H in tissue.
c. Increase signal on T2 images.
d. Decrease signal on T1 images. - Answers-b. Decrease relaxation time for H in tissue.
Tissues that have low (short) relaxation times have:
a, Lower relaxation rates.
b. Higher relaxation rates.
c. Low T2*(star) values.
d. High T2 value. - Answers-b. Higher relaxation rates.
For the following spin-echo protocol:
FOV: 320/ TR:500/ TE:25/ SliceThick.:5mm/ Slice Gap:1mm/ Slice.#:9/ NEX:4,
Matrix:192
Decreasing Slice thickness will:
a. Increase SNR.
b. Decrease SNR.
c. Increase Matrix. - Answers-b. Decrease SNR.
The pixel size formula is:
a. Pixel size = FOV x Matrix.
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