Exeter MR Research Centre

MRI Quiz - Level Two

Choose the correct answer for each question.
  1. 1) How is proton-density weighting achieved?
    1. Short TR, long TE.
    2. Long TR, short TE.
    3. Short TR, short TE.
  2. 2) What are the time constants T1 and T2?
    1. T1 is the spin-lattice or longitudinal relaxation time, and T2 is the spin-spin or transverse relaxation time
    2. T1 and T2 indictate the shape of the exponential recovery and decay curves of the lonitudinal and transverse magnetisation, respectively.
    3. T1 and T2 are magnetic timming parameters which differ from one tissue to anther. They can be used as a source of contrast in MRI images.
  3. 3) What is a T2*
    1. A time constant describing the exponential decay of signal, due to spin-lattice intractions.
    2. A time constant describing the exponential decay of signal, due to spin-spin intractions, magnetic field inhomogeneities, and susceptibility effects.
    3. A time constant describing the exponential decay of signal, due to spin-spin intractions.
  4. 4) What is Zeeman splitting?
    1. The formation of energy eigenstates as a result of the quantization of angular momentum, in the presence of an external magnetic field.
    2. The transition between the spin up and spin down states of nuclear spins, in the presence of an external magnetic field.
    3. Magnetic Resonance Imaging
    4. Maximal Radiology Imaging
  5. 5) Both a 90-degree and a 180-degree pulse is used for what MRI sequence?
    1. Gradient Echo (GR)
    2. FLASH
    3. Spin Echo (SE)
    4. EPI
  6. 6) What does PRECESSION mean?
    1. The spinning of Hydrogen protons around their own axis
    2. Change in orientation of Hydrogen molecules when exposed to radiowaves at the Larmor frequency
    3. The wobble of Hydrogen protons exposed to a large magnetic field
    4. Water molecules gain an extra molecule of Hydrogen when exposed to a magnetic field
  7. 7) What colour is water in a T1 weighted MRI scan?
    1. White
    2. Dark grey
    3. Black
    4. Light grey
  8. 8) Which of these are different colours on T1 and T2 weighted MRI images?
    1. Cortical bone
    2. Flowing blood
    3. Fat
    4. None of the listed
  9. 9) Which of these is a disadvantage of MRI?
    1. High dose of ionizing radiation
    2. Shows vasculature without contrast
    3. Unsuitable for pacemaker wearers
    4. Two-dimensional images
  10. 10) What is the maximum stength of magnet approved for medical imaging of patient?
    1. 7.0 T
    2. 1.5 T
    3. 5.0 T
    4. 3.0 T