Radiology Lecture 18: Computed Tomography (CT) & Cone Beam CT
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Questions and Answers

What type of radiation does a CT scan machine use?

  • X-rays (correct)
  • Alpha radiation
  • Ultraviolet radiation
  • Gamma radiation

    • What is an advantage of CT scans?

  • The machine is very lightweight and portable
  • The patient needs to be present during the interpretation
  • The image that is produced can be selectively viewed and enlarged (correct)
  • The images produced are always blurry

    • What is a disadvantage of CT scans?

  • They are very easy to interpret
  • Very high-density materials produce severe artifacts (correct)
  • They can only be used for facial injuries
  • They are inexpensive to maintain

    • What type of images does a CBCT machine produce?

    <p>3D images</p> Signup and view all the answers

    What is a component of a CBCT machine?

    <p>A rotating gantry with an X-ray source</p> Signup and view all the answers

    What is an application of CT scans?

    <p>Osteomyelitis and space infections</p> Signup and view all the answers

    What is a feature of CT scans?

    <p>They can produce axial, coronal, and sagittal views</p> Signup and view all the answers

    What is a limitation of CT scans?

    <p>They are sophisticated and costly to maintain</p> Signup and view all the answers

    Study Notes

    Computed Tomography (CT)

    • Uses X-rays, a powerful form of electromagnetic radiation
    • Evaluates the entire body
    • Multi-detector CT scanners have evolved, with better clinical applications
    • Applications include:
      • Osteomyelitis and space infections
      • Midfacial and mandibular trauma
      • Developmental anomalies of the craniofacial skeleton
      • Benign intraosseous cysts and neoplasms of the jaws
      • Benign and malignant neoplasms of the orofacial soft tissues
      • Soft-tissue cysts
    • Advantages:
      • Provides axial, coronal, and sagittal views of tissue
      • Displays anatomically precise location of lesions and extent
      • Shows normal and pathological soft tissue structures clearly
      • Allows for selective viewing and enlargement of areas of interest
      • Images can be manipulated and stored for later viewing
    • Disadvantages:
      • Sophisticated and expensive to maintain
      • High-density materials produce severe artifacts, making interpretation difficult
      • Inherent risk associated with contrast medium

    Cone-Beam Computed Tomography (CBCT)

    • A new medical imaging technique that generates 3D images
    • Based on a cone-shaped X-ray beam centered on a 2D detector
    • Components:
      • X-ray source with a rotating gantry
      • Divergent pyramidal or cone-shaped source of ionizing radiation
      • 2D X-ray detector on the opposite side
    • Advantages:
      • Rapid scan time
      • Beam limitation
      • Image accuracy
      • Reduced patient radiation dose
      • Interactive display modes applicable to maxillofacial imaging
    • Disadvantages:
      • Extinction artifacts
      • Beam hardening artifacts

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    Description

    This quiz covers the basics of Computed Tomography (CT) and Cone Beam Computed Tomography (CBCT) in radiology, including their applications and evolution.

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