Forming Mr Images

12 Questions
Image Quizzes & Trivia

Quiz reviewing the basics of forming an MR image.

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Questions and Answers
  • 1. 
    An image creted from a slice perpendicular to the axis running from anterior to posterior in the patient is called?
    • A. 

      Oblique

    • B. 

      Coronal

    • C. 

      Transverse

    • D. 

      Sagittal

  • 2. 
    _ is defined as a small change in the magnetic field along a particular axis.
    • A. 

      A gradient

    • B. 

      Raw data

    • C. 

      Digital

    • D. 

      A fourier tansform

  • 3. 
    In order for energy to be efficiently transferred between a transmitter and a receiver, the two must be at the same:
    • A. 

      Charge

    • B. 

      Frequency

    • C. 

      Mass

    • D. 

      Energy level

  • 4. 
    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:
    • A. 

      Remain unaffected

    • B. 

      Decreased

    • C. 

      Increase

    • D. 

      Reverse direction

  • 5. 
    Which of the following is the function of the gradients?
    • A. 

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

    • B. 

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

    • C. 

      They casue the precessional frequency to vary with position

    • D. 

      They stabilize the magnetic field

  • 6. 
    If a group of protons moves toward the high end of a gradient the precessional frequency of their magnetization:
    • A. 

      Stays the same

    • B. 

      Increases

    • C. 

      Decreases

    • D. 

      Reverses directions

  • 7. 
    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
    • A. 

      1&3

    • B. 

      1 &2

    • C. 

      1, 2, & 3

    • D. 

      2 & 3

  • 8. 
    The - gradient creates a change in the magnetic field from the patient's left side to the right side1. x2. y3. z
    • A. 

      1 only

    • B. 

      1 & 3

    • C. 

      2 only

    • D. 

      1 & 2

  • 9. 
    In MRI, RF energy is
    • A. 

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

    • B. 

      Collimated to strike a thin slice of protons

    • C. 

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

    • D. 

      Focussed at a specific section of the patient's body

  • 10. 
    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.
    • A. 

      42.85

    • B. 

      63.9

    • C. 

      42.39

    • D. 

      42.6

  • 11. 
    • A. 

      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

    • B. 

      42.7MHz

    • C. 

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

    • D. 

      63.5 MHz

  • 12. 
    • A. 

      Only the protons near the patient's head

    • B. 

      Only protons on the patient's left side

    • C. 

      Only protons in th ecenter of the magnet

    • D. 

      None of the protons