Forming Mr Images

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    In order for energy to be efficiently transferred between a transmitter and a receiver, the two must be at the same:

    • Charge
    • Frequency
    • Mass
    • Energy level
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About This Quiz

Quiz reviewing the basics of forming an MR image.

Forming Mr Images - Quiz

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  • 2. 

    If the field strength experienced by a patient within an MR magnet was increased, the precessional frequency of the magnetization of the patient's protons would be expected to:

    • Remain unaffected

    • Decreased

    • Increase

    • Reverse direction

    Correct Answer
    A. Increase
  • 3. 

    _ is defined as a small change in the magnetic field along a particular axis.

    • A gradient

    • Raw data

    • Digital

    • A fourier tansform

    Correct Answer
    A. A gradient
  • 4. 

    If a group of protons moves toward the high end of a gradient the precessional frequency of their magnetization:

    • Stays the same

    • Increases

    • Decreases

    • Reverses directions

    Correct Answer
    A. Increases
  • 5. 

    The - gradient creates a change in the magnetic field from the patient's left side to the right side1. x2. y3. z

    • 1 only

    • 1 & 3

    • 2 only

    • 1 & 2

    Correct Answer
    A. 1 only
  • 6. 

    An image creted from a slice perpendicular to the axis running from anterior to posterior in the patient is called?

    • Oblique

    • Coronal

    • Transverse

    • Sagittal

    Correct Answer
    A. Coronal
  • 7. 

    In MRI, RF energy is

    • Transmitted to all body parts in the vicinity of the RF antenna, or coil

    • Collimated to strike a thin slice of protons

    • Shielded from striking parts of the body which are not being imaged

    • Focussed at a specific section of the patient's body

    Correct Answer
    A. Transmitted to all body parts in the vicinity of the RF antenna, or coil
  • 8. 

    In order to disturb the protons in a particular location of the body, the frequency of the transmitted RF energy must be:

    • Matched to the precessional frequency of the magnetization produced by protons which are exposed to the same magnetic field as the magnetic field of the MR system

    • 42.7MHz

    • Matched to the precessional frequency of the magnetization of protons at that particular location

    • 63.5 MHz

    Correct Answer
    A. Matched to the precessional frequency of the magnetization of protons at that particular location
  • 9. 

    If the slice though the patient that we wish to image is in a magnetic field of 0.995 T, the RF energy sould be transmitted at _ MHz.

    • 42.85

    • 63.9

    • 42.39

    • 42.6

    Correct Answer
    A. 42.39
  • 10. 

    Which of the following is the function of the gradients?

    • They are responsible for ensuring that all of the protons in the body simultaneously receive the RF energy

    • They provide the energy used to move the net magnetization of the protons into the transverse plane

    • They casue the precessional frequency to vary with position

    • They stabilize the magnetic field

    Correct Answer
    A. They casue the precessional frequency to vary with position
  • 11. 

    If a patient is placed in a perfectly homogeneous 1.0 T MR system in the absence of a gradient magnetic field, and an RF pulse was transmitted at 43 MHz, _ would absorbe the RF energy.

    • Only the protons near the patient's head

    • Only protons on the patient's left side

    • Only protons in th ecenter of the magnet

    • None of the protons

    Correct Answer
    A. None of the protons
  • 12. 

    The _ gradient will make the precessional frequency of the magnetization of protons in the patient's right eye different than that of the left heel.1. x 2. y 3. z

    • 1&3

    • 1 &2

    • 1, 2, & 3

    • 2 & 3

    Correct Answer
    A. 1, 2, & 3

Quiz Review Timeline (Updated): Jun 16, 2020 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jun 16, 2020
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 25, 2009
    Quiz Created by
    Athelco
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