| Question 1: For protons, fLarmor = 42.58 MHz at 1 T. What is it at 1.5 T? |
| Reference: | “Medical Imaging: Essentials for Physicians”, A.B. Wolbarst, P. Capasso, and A. Wyant. Wiley-Blackwell (2013), p. 314 |
| Choice A: | 42.58 MHz |
| Choice B: | 28.36 MHz |
| Choice C: | 63.87 MHz |
| Choice D: | 21.39 MHz |
| Choice E: | Cannot be determined from this info. |
| Question 2: If the field homogeneity of a 1.5 T scanner is measured to be one part per million (ppm), what will be the approximate spread in resonant frequencies?
|
| Reference: | ibid, p. 319.
|
| Choice A: | 1.5 Hz |
| Choice B: | 42.58 MHz |
| Choice C: | 42.58 kHz |
| Choice D: | 63.87 MHz |
| Choice E: | 63.87 Hz |
| Question 3: The net magnetic field Bz(x) is measured to be 0.999 T at x = ? 0.05 m and 1.001 T at +5 cm. What is Gx?
|
| Reference: | ibid, p. 318. |
| Choice A: | 0.01 T/m |
| Choice B: | 0.02 T/m |
| Choice C: | 20 mT/m |
| Choice D: | 0.2 T/cm |
| Choice E: | 0.2 T/m |
| Question 4: Gradient coils affect the strength of the magnetic field that, at all locations in space, point…: |
| Reference: | ibid, p. 316 |
| Choice A: | Along the x direction of the scanner. |
| Choice B: | Along the y direction of the scanner. |
| Choice C: | Along the z direction of the scanner. |
| Choice D: | Along all directions of the scanner. |
| Choice E: | Not enough information given here to answer. |
| Question 5: The acronym used to describe the amount of RF radiation uptake in patient tissue is: |
| Reference: | ibid, p. 349. |
| Choice A: | REM |
| Choice B: | SAR |
| Choice C: | CTDI |
| Choice D: | STIR |
| Choice E: | RARE |
| Question 6: The rate of magnetization nutation depends upon: |
| Reference: | ibid, p. 328. |
| Choice A: | The magnitude of the magnetization, |m(t)| |
| Choice B: | The strength of the principal magnetic field, |B0| |
| Choice C: | Strength of the x-gradient field, |x × Gx| |
| Choice D: | The strength of the RF magnetic field, |BRF(t)| |
| Choice E: | T1 |
| Question 7: Information about the structural detail in an image is: |
| Reference: | ibid, p. 337. |
| Choice A: | Dependent on the Fourier transform. |
| Choice B: | Contained in the periphery of k-space. |
| Choice C: | Blurred by increasing separation of lines in k-space. |
| Choice D: | Contained in the center of k-space. |
| Choice E: | Related to gradient duration. |
| Question 8: T2 relaxation refers to: |
| Reference: | ibid, p. 364. |
| Choice A: | The rate at which longitudinal magnetization recovers. |
| Choice B: | The rate at which longitudinal magnetization disappears. |
| Choice C: | The rate at which transverse magnetization recovers. |
| Choice D: | The rate at which transverse magnetization disappears. |
| Choice E: | The rate at which tissue is magnetized. |
| Question 9: T2 relaxation refers to: |
| Reference: | ibid, p. 364. |
| Choice A: | The rate at which longitudinal magnetization recovers. |
| Choice B: | The rate at which longitudinal magnetization disappears. |
| Choice C: | The rate at which transverse magnetization recovers. |
| Choice D: | The rate at which transverse magnetization disappears. |
| Choice E: | The rate at which tissue is magnetized. |
| Question 10: Which of the following would appear bright on a T2-w image of the brain? |
| Reference: | ibid, p. 371. |
| Choice A: | CSF. |
| Choice B: | Fat. |
| Choice C: | Bone. |
| Choice D: | White matter. |
| Choice E: | Air. |
