Radiology Lecture 11
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Questions and Answers

Which type of radiation is harmful and produces biologic changes in living tissues?

  • Gamma rays
  • X-rays (correct)
  • Ultraviolet rays
  • Microwaves

    • What is the primary component of living cells that is ionized by x-ray photons?

  • Carbon dioxide
  • Glucose
  • Water (correct)
  • Oxygen

    • What is the MOST COMMON mechanism of damage in humans caused by ionization of water?

  • Formation of hydrogen gas
  • Formation of hydroxyl free radicals
  • Formation of free radicals (correct)
  • Formation of toxins

    • Which unit is used to measure the amount of radiation absorbed by the tissue?

    <p>Gray (Gy)</p> Signup and view all the answers

    Which cells are most sensitive to radiation?

    <p>Immature reproductive cells</p> Signup and view all the answers

    Which of the following is a long-term effect of radiation exposure?

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

    Which organ is considered a critical organ in dental imaging procedures?

    <p>Thyroid gland</p> Signup and view all the answers

    Which organs are considered critical organs in dental imaging procedures?

    <p>Thyroid gland and active bone marrow</p> Signup and view all the answers

    What is the risk of dental radiography causing fatal cancer compared to the risk of someone spontaneously developing cancer?

    <p>1/1000 times lower</p> Signup and view all the answers

    How can radiation exposure be reduced when using dental imaging?

    <p>Using F-speed film instead of D-speed</p> Signup and view all the answers

    Which theory of radiation injury suggests that cell damage results from the direct contact of ionizing radiation within the cell?

    <p>The direct theory</p> Signup and view all the answers

    What is the relationship between dose and tissue damage according to the dose-response curve?

    <p>Linear and non-threshold</p> Signup and view all the answers

    What is the purpose of film mounting in dental radiography?

    <p>To store radiographs in the patient record</p> Signup and view all the answers

    What is the latent period in radiation injury?

    <p>The time between exposure and observable clinical signs</p> Signup and view all the answers

    What are the potential effects of repeated radiation exposure?

    <p>Cancer, cataract formation, and birth defects</p> Signup and view all the answers

    Which method of film mounting is recommended by the American Dental Association?

    <p>Labial mounting</p> Signup and view all the answers

    In labial mounting, how should the identification dot be placed in the film mount?

    <p>Raised (convex) side facing the viewer</p> Signup and view all the answers

    What is the purpose of mounting radiographs in a designated area?

    <p>To ensure proper organization</p> Signup and view all the answers

    What should be done before mounting films?

    <p>All of the above</p> Signup and view all the answers

    Which is the recommended viewing sequence for examining radiographs?

    <p>Start with the films on the upper left side of the mount and move horizontally to the upper right</p> Signup and view all the answers

    What is the optimal viewing condition for watching films?

    <p>In a brightly lit area free of distractions</p> Signup and view all the answers

    What should be done when viewing a CMS?

    <p>Start with the bite-wings and move horizontally to the upper left side of the mount</p> Signup and view all the answers

    Which of the following is the primary component of living cells that is ionized by x-ray photons?

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

    What is the lifetime of a free radical, approximately?

    <p>10 seconds</p> Signup and view all the answers

    What is the MOST COMMON mechanism of damage in humans caused by ionization of water?

    <p>Formation of hydrogen and hydroxyl free radicals</p> Signup and view all the answers

    Which of the following is a short-term effect of radiation exposure?

    <p>Nausea and vomiting</p> Signup and view all the answers

    Which of the following is NOT a long-term effect of radiation exposure?

    <p>Nausea and vomiting</p> Signup and view all the answers

    Which of the following cells is MOST sensitive to radiation?

    <p>Blood cells</p> Signup and view all the answers

    Which of the following is a critical organ exposed during dental imaging procedures in the head and neck region?

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

    Which organs are considered critical organs in dental imaging procedures?

    <p>Thyroid gland and active bone marrow</p> Signup and view all the answers

    What is the risk of dental radiography causing fatal cancer compared to the risk of someone spontaneously developing cancer?

    <p>1/1,000</p> Signup and view all the answers

    How can radiation exposure be reduced when using dental imaging?

    <p>Using digital sensors</p> Signup and view all the answers

    What collimation and receptor combination would result in the lowest radiation dose for a patient?

    <p>Rectangular collimation with a digital sensor</p> Signup and view all the answers

    According to the text, what is the latent period in radiation injury?

    <p>The time between exposure and the appearance of observable clinical signs</p> Signup and view all the answers

    According to the text, what is the primary component of living cells that is ionized by x-ray photons?

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

    According to the text, what is the relationship between dose and tissue damage according to the dose-response curve?

    <p>A linear, non-threshold relationship</p> Signup and view all the answers

    According to the text, what is the MOST COMMON mechanism of damage in humans caused by ionization of water?

    <p>Formation of toxins</p> Signup and view all the answers

    Which viewing sequence should be followed when examining radiographs using a CMS?

    <p>Start with the films on the upper left side of the mount, move horizontally to the upper right, down to the lower right, across the lower left, up to the bite-wings, and then view the bite-wings from left to right.</p> Signup and view all the answers

    What should be done to evaluate radiographs for unerupted, impacted, and missing teeth?

    <p>Examine radiographs multiple times.</p> Signup and view all the answers

    What should be done when viewing a CMS?

    <p>Start with the films on the upper left side of the mount and view them from left to right.</p> Signup and view all the answers

    Which method of film mounting is NOT recommended in dental radiography?

    <p>Lingual mounting</p> Signup and view all the answers

    What is the purpose of labeling and dating the film mount before mounting the films?

    <p>To ensure correct orientation of the films</p> Signup and view all the answers

    What is the recommended order for mounting films in dental radiography?

    <p>Begin with bite-wing images, then mount maxillary anterior periapical films, proceed to mandibular anterior periapical films, and then finish with maxillary posterior periapical films and mandibular posterior periapical films</p> Signup and view all the answers

    What is the purpose of using a magnifying glass to evaluate radiographic images?

    <p>To evaluate slight changes in density and contrast</p> Signup and view all the answers

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