| Question 1: Intravoxel incoherent motion is a technique that incorporates ________ b-values than standard DWI that can be used to help quantitatively or qualitatively characterize pseudodiffusion effects from _________.: |
| Reference: | Iima M, Le Bihan D. Clinical Intravoxel Incoherent Motion and Diffusion MR Imaging: Past, Present, and Future. Radiology. 2016 Jan;278(1):13-32. |
| Choice A: | Higher, tissue elasticity. |
| Choice B: | Higher, tissue perfusion. |
| Choice C: | Lower, tissue elasticity. |
| Choice D: | Lower, tissue perfusion. |
| Question 2: The EPI sequence commonly used to acquire DWI suffers from distortion and filtering effects primarily in the _____________ direction that can be reduced by minimizing the ___________: |
| Reference: | Wu W, Miller KL. Image formation in diffusion MRI: A review of recent technical developments. J Magn Reson Imaging. 2017 Sep;46(3):646-662. |
| Choice A: | Phase-encoding, pulse-repetition time. |
| Choice B: | Phase-encoding, echo-spacing. |
| Choice C: | Frequency-encoding, receiver bandwidth. |
| Choice D: | Frequency-encoding, echo-time. |
| Question 3: Parallel imaging can help reduce distortion in EPI based DWI by: |
| Reference: | Wu W, Miller KL. Image formation in diffusion MRI: A review of recent technical developments. J Magn Reson Imaging. 2017 Sep;46(3):646-662. |
| Choice A: | Reducing the effective echo-time. |
| Choice B: | Reducing the effective pulse repetition time. |
| Choice C: | Reducing the effective echo-spacing. |
| Choice D: | Reducing the effective sampling bandwidth. |
| Question 4: Tetrahedral gradient weighting for isotropic diffusion can be used to maintain shorter echo-times at larger b-values by: |
| Reference: | Ni P, Lin Y, Zhong Q, Chen Z, Sandrasegaran K, Lin C. Technical advancements
and protocol optimization of diffusion-weighted imaging (DWI) in liver. Abdom
Radiol (NY). 2016 Jan;41(1):189-202.
|
| Choice A: | Reducing echo-train length. |
| Choice B: | Applying all three gradients simultaneously. |
| Choice C: | Using an increased number of diffusion sensitization directions. |
| Choice D: | Incorporating simultaneous multi-slice imaging. |
| Question 5: White matter diffusion is highly __________ and this property can be qualitatively or quantitatively characterized using ____________.: |
| Reference: | Viallon M, Cuvinciuc V, Delattre B, Merlini L, Barnaure-Nachbar I, Toso-Patel
S, Becker M, Lovblad KO, Haller S. State-of-the-art MRI techniques in
neuroradiology: principles, pitfalls, and clinical applications. Neuroradiology.
2015 May;57(5):441-67.
|
| Choice A: | Isotropic, diffusion kurtosis imaging |
| Choice B: | Isotropic, diffusion tensor imaging |
| Choice C: | Anisotropic, diffusion IVIM imaging |
| Choice D: | Anisotropic, diffusion tensor imaging |
| Question 6: Diffusion weighted imaging is useful in assessing acute cerebral infarction because in the region of ischemic insult, the apparent diffusion coefficient is _________. |
| Reference: | Iima M, Le Bihan D. Clinical Intravoxel Incoherent Motion and Diffusion MR Imaging: Past, Present, and Future. Radiology. 2016 Jan;278(1):13-32. |
| Choice A: | Increased |
| Choice B: | Decreased |
| Choice C: | Anisotropic |
| Choice D: | Non-Gaussian |
