Summary
Summary Dental Radiography Notes
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Summary and notes from dental radiography.
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DentalImage
X-Ray
Characteristics
Chapter 8.
, Dental X-Ray Image characteristics
Chap .
8
Radiolucent :
Radiopaque
. '-
y
Dental X-ray image
characteristics are
divided into 2 categories :
Visual Characteristics
Geometric characteristics
characteristics in both of the categories
influence the diagnostic quality of dental
radiographs .
Visual characteristics :
Short-scale contrast
-
Long-Scale Contrast
-
1)
Density
Proper film
·
allows for black areas
density
:
lair spaces) white Spaces lenamel dentin ,
, ,
bone) and grey areas (soft tissue to be
seen .
,Factors that Influence Density :
Exposure factors
·
Milliamperage
z Kilovoltage
Exposure
Peak
time
subject thicknessla molar is thicker than
-
an incisor)
Densitur Milliamperage
Increasing MA increases the # of X-rays in
·
the beam
This makes more X-rays available to
-
interact with the film
·
This increases film density which means the
film appears darker
The Reverse of this is also TRUE
Density Kilovoltage Peak (kVp)
Increasing the kVp increases the energy or
-
penetrating power of the X-ray photons in
the beam
Increasing the
energy
penetrating power
or
-
X-rays will reach the film
means more .
·
This increases film density which means
the film appears darker
, -
Density and Exposure Time
Increasing exposure time increases the
-
total number of X-ray photons that reach
the film surface.
This increases film
density which means the
film appears darker
Density andSubject Thickness
-
Increased Subject thickness (i e thicker soft .
.
tissue or more dense bone allows fewer
X-ray photons to reach the film .
This reduces film which means
density
·
the film appears lighter .
To compensate for variations in
Density :
Patient size (thickness or
Structure) , adjustments can be
made in :
·
VD
·
MA
·
Exposure time
contrast
-
Difference in the
degree of blackness
Idensity) between adjacent areas on a
dental film
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