Slide 1
Dental X-Ray
Image Characteristics
Chapter 8
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Slide 2
Learning Objectives
Lesson 8.1: Dental X-Ray
Image Characteristics
1. Define the key terms associated with film
image characteristics.
2. Differentiate between radiolucent and
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Slide 3
Learning Objectives
Lesson 8.1: Dental X-Ray
Image Characteristics (Cont.)
6. Discuss the difference between high contrast
and low contrast.
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Slide 4
Learning Objectives
Lesson 8.1: Dental X-Ray
Image Characteristics (Cont.)
11. List the three geometric characteristics of the
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Slide 5
Introduction
Purpose
To describe in detail the visual image
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Slide 6
Dental X-Ray
Image Characteristics
A dental radiograph appears as a black and
white image or picture with varying shades of
gray.
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Slide 7
Dental X-Ray
Image Characteristics (Cont.)
In a diagnostic radiograph the images:
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Slide 8
Visual Characteristics
Density
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Slide 9
Copyright © 2017, Elsevier Inc. All Rights Reserved.
Density
The overall darkness or blackness of a dental
radiograph
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Slide 10
Contrast
Contrast is the difference in degrees of
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Slide 11
Contrast (Cont.)
Influencing factors
Increasing the kilovoltage affects image contrast
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Slide 12
Contrast (Cont.)
High contrast
A dental image that has very dark areas and very
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Slide 13
Contrast (Cont.)
The overall contrast is determined by:
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Slide 14
Contrast (Cont.)
Scales of contrast
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Slide 15
Contrast (Cont.)
Identify images of:
High contrast (an image that has very dark areas
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Slide 16
Contrast (Cont.)
An aluminum stepwedge can demonstrate
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Slide 17
Geometric Characteristics
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Slide 18
Sharpness
Sharpness is the capability of the x-ray
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Slide 19
Sharpness (Cont.)
Influenced by three factors
Focal spot size
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Slide 20
Magnification
Results from the divergent paths of the x-ray
beam as they radiate from the focal spot
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Slide 21
Distortion
A variation in the true size and shape of the
object being radiographed
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Slide 22
Questions?
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