Question 1: For each million protons in 3.0T field, what approximately is the excess number of protons with spins aligned with the field versus those aligned against it?
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Reference: | Magnetic Resonance Imaging, R.W. Brown et al., 2nd Edition 2014, pp 4-5
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Choice A: | One million. |
Choice B: | Zero. |
Choice C: | Ten. |
Choice D: | Three. |
Question 2: On a T1-weighted MR image, tissues with long spin lattice relaxation...
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Reference: | MRI. From Picture to Proton, D.W. McRobbie et al., 2nd Edition, 2007, p. 33 |
Choice A: | Appear bright. |
Choice B: | Appear dark. |
Choice C: | Have same signal intensity as tissues with short spin lattice relaxation. |
Choice D: | Impossible to say. |
Question 3: Which method is NOT in the list for assessment of magnetic field homogeneity recommended by the ACR?
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Reference: | 2015 MRI Quality Control Manual, ACR, p.74 |
Choice A: | Spectral peak method. |
Choice B: | Bandwidth-difference method. |
Choice C: | Frequency map method. |
Choice D: | Phase-map method. |
Choice E: | Phase-difference method. |
Question 4: What is the recommended action criterion for percent integral uniformity on ACR phantom using volume coils at 3.0 T field strength?
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Reference: | Phantom Test Guidance for the ACR MRI Accreditation Program,2005, p.17
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Choice A: | Greater than 87.5% |
Choice B: | Greater than 82.0% |
Choice C: | Lesser than 82.0% |
Choice D: | Greater than 80.0% |
Question 5: In echo planar imaging (EPI), chemical shift, a difference in the resonance frequency such as the difference between fat and water, will cause a miss-registration in:
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Reference: | Jerrold T. Bushberg, et al, The Essential Physics of Medical Imaging, Second Edition. Lippincott Williams and Wkilkins 2002. p. 453 |
Choice A: | Slice selection direction. |
Choice B: | Frequency encoding direction. |
Choice C: | Phase encoding direction. |
Choice D: | All directions. |
Question 6: During image reconstruction, a low pass filter is typical applied to the raw data in K-Space. The main purpose of such filter is to:
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Reference: | Jerrold T. Bushberg, et al. The Essential Physics of Medical Imaging, Second Edition. Lippincott Williams and Wkilkins 2002. p. 455 |
Choice A: | Reduce motion artifact. |
Choice B: | Improve image resolution. |
Choice C: | Reduce ringing artifact. |
Choice D: | Improve image contract. |
Question 7: When a K-Space low pass filter is applied as in question 2, what would be its impact to the SNR:
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Reference: | Jerrold T. Bushberg, et al. The Essential Physics of Medical Imaging, Second Edition. Lippincott Williams and Wkilkins 2002. p. 442 |
Choice A: | Increase. |
Choice B: | No change. |
Choice C: | Decrease. |
Choice D: | Becomes non-uniform. |
Question 8: An inversion recovery pulse sequence uses which combination of RF pulses: |
Reference: | The Essential Physics of Medical Imaging, JT Bushberg, JA Seibert, EM Leidholdt Jr, JM Boone, 3rd edition, 2012, p. 421-437. |
Choice A: | 90 degree, 180 degree, |
Choice B: | 90 degree, 180 degree, 180 degree |
Choice C: | 180 degree, 90 degree, 180 degree |
Choice D: | One RF pulse less than 90 degrees |
Question 9: In 2D spin echo imaging, the slice select gradient is applied at the same time as the...
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Reference: | Handbook of MRI Pulse Sequences, MA Bernstein, KF King, XJ Zhou, 2004, p.632-634. |
Choice A: | Spin echo. |
Choice B: | Frequency encode gradient. |
Choice C: | Phase encode gradient. |
Choice D: | Radio frequency pulses. |
Question 10: Echo planar imaging produces images characterized by.... |
Reference: | The Essential Physics of Medical Imaging, JT Bushberg, JA Seibert, EM Leidholdt Jr, JM Boone, 3rd edition, 2012, p. 456. |
Choice A: | Low resolution, decreased artifacts |
Choice B: | Low resolution, increased artifacts |
Choice C: | High resolution, decreased artifacts. |
Choice D: | High resolution, increased artifacts |