Dentistry Chapter 22 Explain The Imaging Procedures Place Lead Apron

Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 1

Panoramic Imaging

Chapter 22

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Slide 2

Learning Objectives

Lesson 22.1: Panoramic Imaging

1. Define the key terms associated with panoramic

imaging.

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Slide 3

Learning Objectives

Lesson 22.1: Panoramic Imaging (Cont.)

6. Describe a diagnostic panoramic image.

7. Identify the patient preparation and patient

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 4

Introduction

Purpose

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Slide 5

Basic Concepts

Purpose and use

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Slide 6

Basic Concepts (Cont.)

Panoramic image

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 7

Purpose and Use

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Slide 8

Fundamentals

In panoramic imaging, the receptor and x-ray

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Slide 9

Fundamentals (Cont.)

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 10

Fundamentals (Cont.)

The movement of the receptor and the

tubehead produces an image through the

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Slide 11

Rotation Center

The pivotal point, or axis, around which the

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Slide 12

Rotation Center (Cont.)

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 13

Focal Trough

Can be defined as a three-dimensional

curved zone in which structures are clearly

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Slide 14

Resultant Images

Real image

Results when a structure lies between the

receptor and moving rotation center

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Slide 15

Equipment

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 16

Panoramic X-Ray Units

There are a number of different panoramic

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Slide 17

Panoramic X-Ray Units (Cont.)

X-ray tubehead

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Slide 18

Panoramic X-Ray Units (Cont.)

The x-ray beam emerges from the panoramic

tubehead through the collimator as a narrow

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 19

Head Positioner

A chin rest, notched bite-block, forehead rest,

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Slide 20

Head Positioner (Cont.)

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Slide 21

Exposure Factors

Suggested exposure factors for

milliamperage and kilovoltage are provided

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 22

Image Receptors

In panoramic x-ray units, the image receptor

may be a direct digital sensor, a PSP plate, or

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Slide 23

Image Receptors (Cont.)

In panoramic x-ray units, the image receptor

may be a direct digital sensor, a PSP plate, or

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Slide 24

Intensifying Screens

Calcium tungstate

Emit blue light

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 25

Cassette

A device used to hold the extraoral film and

intensifying screens

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Slide 26

Step-by-Step Procedures

Equipment preparation

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Slide 27

Equipment Preparation

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 28

Patient Preparation

Explain the imaging procedures.

Place a lead apron without a thyroid collar on

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Slide 29

Patient Positioning

Instruct the patient to sit or stand “as tall as

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Slide 30

Patient Positioning (Cont.)

Position the Frankfort plane parallel with the

floor.

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 31

Patient Positioning (Cont.)

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Slide 32

Diagnostic Panoramic Image

Results when the equipment preparation,

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Slide 33

Anatomic Features

Panoramic image must allow for the

visualization of the maxillofacial anatomic

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 34

Density and Contrast

Diagnostic panoramic image results from

adequate exposure and exhibits proper

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Slide 35

Exposure

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Slide 36

Common Errors

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 37

Patient Preparation Errors

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Slide 38

Ghost Images

An imaging artifact seen on a panoramic

image that is produced when a metallic or

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Slide 39

Ghost Images (Cont.)

Problem

If all metallic or radiodense objects are not

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 40

Lead Apron Artifact

Problem

A radiopaque cone-shaped artifact that obscures

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Slide 41

Patient Positioning Errors

Positioning of the lips and tongue

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Slide 42

Positioning of the Lips and Tongue

Problem

If the patient’s lips are not closed on the bite-block

during the exposure of a panoramic projection, a dark

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 43

Chin Tipped Up

Problem

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Slide 44

Chin Tipped Up (Cont.)

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Slide 45

Chin Tipped Down

Problem

If the patient’s chin is positioned too low or is

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 46

Teeth Anterior to the Focal Trough

Problem

If the patient’s teeth are positioned too far forward

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Slide 47

Teeth Posterior to the Focal Trough

Problem

If the patient’s teeth are positioned too far back on

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Slide 48

Head Turned

Problem

If the patient’s head is not centered, the ramus

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 49

Slumped Posture

Problem

If the patient is not standing or sitting with a

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Slide 50

Advantages of

Panoramic Radiography

Field size

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Slide 51

Disadvantages of

Panoramic Radiography

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Dental Radiography: Principles and Techniques, 5th Edition

Chapter 22 Student Handout

Slide 52

Questions?

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