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Concepts of Panoramic Radiography Introduction

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

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  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 client’s 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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