RADIOLOGY LECTURE 4 ~~~~
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RADIOLOGY LECTURE 4 ~~~~

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Questions and Answers

What is the measure of effective dose (E) in radiation exposure?

  • Sievert (Sv) (correct)
  • Milligray (mGy)
  • Röntgen (R)
  • Gray (Gy)

    • Which method of imaging delivers significantly more radiation exposure?

  • Ultrasound
  • MRI scan
  • Chest X-ray
  • CT scan (correct)

    • What is the SI unit for measuring radiation absorbed dose (D)?

  • Röntgen (R)
  • Sievert (Sv)
  • Millisievert (mSv)
  • Gray (Gy) (correct)

    • What does the reference dose indicate in radiographic examinations?

    <p>A level that should not be exceeded</p> Signup and view all the answers

    What is a likely unit for natural background radiation dose measurements?

    <p>Millisievert (mSv)</p> Signup and view all the answers

    What is the effective dose (E) calculated by?

    <p>Multiplying the equivalent dose (H) by the tissue weighting factor (WT)</p> Signup and view all the answers

    Which of the following represents the highest radiation dosage level for dental X-rays?

    <p>CBCT (full jaw)</p> Signup and view all the answers

    Why is the accumulation of X-ray doses a concern in dental practice?

    <p>Frequent X-rays may increase the risk of malignancy over time.</p> Signup and view all the answers

    What is meant by 'dose limitation' in the context of radiation exposure?

    <p>Setting maximum allowable levels of radiation for individuals.</p> Signup and view all the answers

    What principle advocates for the use of the lowest dose possible in radiation exposure?

    <p>Optimization (ALARP)</p> Signup and view all the answers

    What is the maximum dose limit for non-classified workers like dentists?

    <p>6 mSv</p> Signup and view all the answers

    How are Diagnostic Reference Levels (DRLs) defined?

    <p>As guidelines to ensure procedures do not exceed set dose levels.</p> Signup and view all the answers

    What radiation quality weighting factor is assigned to X-rays and gamma rays?

    <p>1</p> Signup and view all the answers

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