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Concepts of Panoramic Radiography Introduction. DHY 202 Clinical Radiology I Dental Hygiene Department William Rainey Harper College. Introduction to Panoramic Radiography. Commonplace in dental practice Considered essential in radiographic diagnosis 30% of dental units sold are panoramic.

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concepts of panoramic radiography introduction

Concepts of Panoramic RadiographyIntroduction

DHY 202 Clinical Radiology I

Dental Hygiene Department

William Rainey Harper College

introduction to panoramic radiography
Introduction to Panoramic Radiography
  • Commonplace in dental practice
  • Considered essential in radiographic diagnosis
  • 30% of dental units sold are panoramic
introduction to panoramic radiography3
Introduction to Panoramic Radiography
  • “Panorama” means unobstructed view of a region in any direction
  • Panoramic radiograph show greater coverage than periapical and bitewing radiographs
introduction to panoramic radiography4
Introduction to Panoramic Radiography
  • New technique
  • Introduced in 1959
  • Employs scanography (slit beam) & curved surface rotational tomography
client dose from panoramic radiography
Client Dose from Panoramic Radiography
  • 10 times less radiation than a complete intraoral survey using long, round PID & E+ film
  • 4 time less radiation than a bitewing survey using long, round PID and E+ film
indications for panoramic
Indications for Panoramic
  • Pathology-cysts, tumors
  • Trauma-fractures
  • Growth & development
  • Client management
  • Edentulous
  • Localization: anatomy, objects, implant placement
  • Carotid artery condition
advantages of panoramic radiography
Advantages of Panoramic Radiography
  • Field size
  • Quality control
  • Simplicity
  • Time & rapidity of the procedure
  • Client cooperation
  • Dose
  • Minimal infection control
  • Gross anatomy & pathology visible
disadvantages of panoramic radiography
Disadvantages of Panoramic Radiography
  • Image quality
  • Focal trough limitations
  • Equipment costs
  • Overuse
disadvantages of panoramic radiography9
Disadvantages of Panoramic Radiography
  • Image quality
    • Magnification
    • Distortion
    • Poor definition compared to intraoral
    • Overlap
    • Superimposition & ghost images
disadvantages of panoramic radiography10
Disadvantages of Panoramic Radiography
  • Poor image quality due to
    • Tomographic process
    • Increased object-film distance
    • Use of intensifying screens
    • Faster film with larger crystals
disadvantages of panoramic radiography11
Disadvantages of Panoramic Radiography
  • Focal Trough (Image Layer)
    • Areas outside are not visible
    • Size & shape limits imagery to those structures which “fit” into the image layer
    • Size & shape not adjustable so not all client’s arches image equally well
disadvantages of panoramic radiography12
Disadvantages of Panoramic Radiography
  • Distortion
    • Vertical & horizontal distortion with variations causes uneven magnification
disadvantages of panoramic radiography13
Disadvantages of Panoramic Radiography
  • Superimposition & Ghost Images
    • All objects in the field of the beam, even those outside of the image layer are projected onto the film but most are not seen.
    • Objects with the greatest density are projected in two places on the film
      • Intended (useable image)
      • Ghost image (reversed, higher, blurred)

Frommer 2001

disadvantages of panoramic radiography14
Disadvantages of Panoramic Radiography
  • Superimposition & Other Imaging Quirks
    • Ghost images may hide pathosis
    • Soft tissue shadows may mimic pathosis