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Concepts of Panoramic Radiography Introduction

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4 time less radiation than a bitewing survey using long, round PID and E film ... Growth & development. Client management. Edentulous ... – PowerPoint PPT presentation

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Title: Concepts of Panoramic Radiography Introduction


1
Concepts of Panoramic RadiographyIntroduction
  • DHY 202 Clinical Radiology I
  • Dental Hygiene Department
  • William Rainey Harper College

2
Introduction to Panoramic Radiography
  • Commonplace in dental practice
  • Considered essential in radiographic diagnosis
  • 30 of dental units sold are panoramic

3
Introduction to Panoramic Radiography
  • Panorama means unobstructed view of a region in
    any direction
  • Panoramic radiograph show greater coverage than
    periapical and bitewing radiographs

4
Introduction to Panoramic Radiography
  • New technique
  • Introduced in 1959
  • Employs scanography (slit beam) curved surface
    rotational tomography

5
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

6
Indications for Panoramic
  • Pathology-cysts, tumors
  • Trauma-fractures
  • Growth development
  • Client management
  • Edentulous
  • Localization anatomy, objects, implant placement
  • Carotid artery condition

7
Advantages of Panoramic Radiography
  • Field size
  • Quality control
  • Simplicity
  • Time rapidity of the procedure
  • Client cooperation
  • Dose
  • Minimal infection control
  • Gross anatomy pathology visible

8
Disadvantages of Panoramic Radiography
  • Image quality
  • Focal trough limitations
  • Equipment costs
  • Overuse

9
Disadvantages of Panoramic Radiography
  • Image quality
  • Magnification
  • Distortion
  • Poor definition compared to intraoral
  • Overlap
  • Superimposition ghost images

10
Disadvantages of Panoramic Radiography
  • Poor image quality due to
  • Tomographic process
  • Increased object-film distance
  • Use of intensifying screens
  • Faster film with larger crystals

11
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 clients
    arches image equally well

12
Disadvantages of Panoramic Radiography
  • Distortion
  • Vertical horizontal distortion with variations
    causes uneven magnification

13
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

14
Disadvantages of Panoramic Radiography
  • Superimposition Other Imaging Quirks
  • Ghost images may hide pathosis
  • Soft tissue shadows may mimic pathosis
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