MRI image
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Decreasing the receiver bandwidth (utilizing a narrow BW): A. Increases susceptibility artifact B. Decreases susceptibility artifact C. Does not affect susceptibility artifact D. Decreases SNR E. A and D only F. B and D only | show 🗑
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| Which is FALSE regarding the use of a narrow receiver bandwidth? A. generates lower SNR images B. should be applied in anatomical regions that contain high fat and water C. utilized with a high readout gradient amplitude D. All of the above | show 🗑
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| If 24 4mm slices are planned with a gap of 1mm, the total anatomic coverage is _______ cm. A. 10 B. 12 C. 15 D. 120 | show 🗑
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| show | To control saturation effects
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| Gradient echo sequences use flip angles: A. To control saturation effects B. After the 180º pulse C. Between the 90º and the 180º pulses D. To control SAR in bariatric patients | show 🗑
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| Two gradients applied at the same time during slice selection are utilized for: A. Reducing the cryogen boil off rate B. Encoding oblique slice planes C. Eliminating residual transverse magnetization for steady state D. Encoding 3D volumes for MRA | show 🗑
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| show | Prior to the excitation pulse
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| show | B and D only
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| show | 12
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| show | Decreases the contrast based on T2 tissue relaxation times
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| show | I and II
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| show | RF energy application
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| The signal produced immediately following an RF pulse is: A. Ham radio signal B. Gradient echo C. FID D. MIP | show 🗑
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| The time during which the frequency encoding gradient is on A. Increases with a reduction in receiver bandwidth B. Decreases with a reduction in receiver bandwidth C. not affected by a reduction in receiver bandwidth D. limited by the inverse of | show 🗑
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| show | Increases to a point called the Ernst angle
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| show | Increase
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| Which of the following can be considered an advantage of selecting a 3D acquisition as opposed to a 2D acquisition? A. The slices have a greater SNR B. No crosstalk C. Longer repetition times D. All of the above E. A & B only | show 🗑
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| show | Frequency encoding
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| show | Remain constant
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| show | B and D only
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| When gradient moment nulling is used as an imaging option in MR sequences: A. SNR is degraded B. The minimum TE is increased C. The minimum TE is decreased D. More slices are available per TR | show 🗑
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| show | Increases the SNR of the image
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| show | A gradient
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| Which set of scan parameters below would yield the best spatial resolution? A. 270 mm FOV, 192 x 512 matrix, 5mm slice thickness, 8 NEX B. 200 mm FOV, 512 x 512 matrix, 3mm slice thickness, 4 NEX | show 🗑
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| show | Strength and duration of the RF field
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| show | A & C only
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| show | Pixel, two-dimensional
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| Complete saturation is a condition where: B. The signal from fluid is inverted from a long TI C. Transverse magnetization is not allowed to recover between excitations D. Longitudinal magnetization is not allowed to recover between excitations | show 🗑
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| show | Decreases
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| Decreasing the slice selection gradient strength will ________ of the resulting slice. A. Change the orientation B. Change the slice thickness C. Invert the phase and frequency sampling directions D. Alter the field of view | show 🗑
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| show | B and D only
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| Applying two gradients simultaneously during slice selection would: A. Produce an artifact B. Produce an oblique slice C. Produce partial volume averaging D. Result in an equipment fault | show 🗑
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| Increasing the field of view (FOV) would have what effect? A. Decrease spatial resolution B. Increase spatial resolution C. Decrease temporal resolution D. Increase temporal resolution | show 🗑
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| show | Raw data
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| show | Decreases chemical shift artifacts
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| show | FOV, slice thickness and matrix
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| show | Rectangular FOV
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| show | D. Fourier transform
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| In a gradient echo sequence, reducing the flip angle while maintaining the TR reduces: A. Scan time B. T2* contrast C. Inversion delay D. Saturation | show 🗑
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| show | Flip angle; maximum
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| What effect would using a steep slice select slope and/or narrow bandwidth have on slice thickness? A. Partial volume averaging will occur B. Slices will be thin C. Slices will be thick D. Slices will cross-talk | show 🗑
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| Signal to Noise Ratio (SNR) would increase in a 3D volume acquisition with an increase in: A. TE B. Slices C. Field of view D. All of the above E. B and/or C only | show 🗑
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| show | A steep gradient is applied with the transmit bandwidth at the Larmor frequency of H
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| Which of the following is NOT a result of reducing the FOV? A. Improved spatial resolution B. Decreased signal-to-noise C. Anatomical structures are displayed smaller in the image D. The pixel size becomes smaller | show 🗑
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| Decreasing the receiver bandwidth (utilizing a narrow BW): A. Increases the number of slices available B. Decreases the number of slices available C. Does not change the number of slices available D. Decreases SNR E. A and D only F. B and D on | show 🗑
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| show | Reduce flow artifacts
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| show | Increases susceptibility artifact
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| show | An interslice gap
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| All of the following are true mechanisms of saturation EXCEPT: A. A saturation pulse excites hydrogen protons to a frequency that gives no signal on the image B. Partial saturation yields T1 weighting; occurs when NMV >90° C. Partial saturation yiel | show 🗑
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| show | Multi-Planar reconstruction (MPR)
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| show | C. Cubic
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| Gradient moment nulling is used to compensate for: I. First order motion II. Second order motion III. Slow flowing vessels IV. Fast flowing vessels | show 🗑
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| show | Projects the high intensity pixels which represent blood vessels/ducts into one image
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| Slice ___________ is determined by the slice selection process. A. Position B. Orientation C. Thickness D. All of the above | show 🗑
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| If the maximum slices in a set TR is 10, and the necessary number of slices for a given sequence's anatomical coverage is 26, how many acquisitions (packages) will be required? A. 1 B. 2 C. 3 D. 4 | show 🗑
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| show | Increases SNR by √2
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Created by:
zach1710