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

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

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

What is a component of a CBCT machine?

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

What is an application of CT scans?

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

What is a feature of CT scans?

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

What is a limitation of CT scans?

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

Flashcards are hidden until you start studying

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

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser