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Introduction and Overview
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Blurring and Visibility of
Detail
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Sources of Blurring in
Radiography
Motion
Focal Spot
Receptor
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The Geometry of Radiography
Locations
Receptor
Focal Spot
Object to be Imaged
Distances
FRD (Focal Spot to Receptor Distance)
ORD (Object to Receptor Distance)
OFD (Object to Focal Spot Distance)
Magnification
Object Location on the S scale.
Motion Blurring
Exposure Time
Object Velocity
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Focal Spot Blurring
The Blurring Process
Factors Affecting Amount of Blurring
Object Location
Focal Spot Size
Focal Spot Size
Sizes Used in Clinical Procedures
Heat Capacity
Measuring Focal Spot Size
Star Test Pattern
Pin Hole Camera
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Receptor Blurring
The Blurring Process in
Film/Screen Receptors
Light Spreading Within Intensifying
Screens
Poor Film/Screen Contact
Light Crossover Within Film
Relationship of Receptor Blur Values to
Receptor Sensitivity (Speed)
Characteristics of Film/Screen Receptors Used in Clinical Procedures
The Blurring Process in Digital
Radiographic Receptors
Light Spreading Within Receptors
Pixel Size
Factors Affecting Pixel Size
Image Matrix Size (Number of Pixels in Each
Direction)
Image Size (Field Of View)
Factors Affecting Amount of Blurring in Image
Object Location
Receptor Design (Equivalent Blur Values)
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Composite Blur and
Magnification
Concept of Composite Blur
Magnification and Image Detail
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Summary