Radiographic Detail

Mind Map

Outline
and
Learning Guide

Objectives
and
Learning Activities

Visuals for
Class Discussion

Self-study
Module

Online
Textbook

Outline and Learning Guide

  • Introduction and Overview
     

  • Blurring and Visibility of Detail
     

  • Sources of Blurring in Radiography
    Motion
    Focal Spot
    Receptor
     

  • 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
     

  • 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
     

  • 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)
     

  • Composite Blur and Magnification
    Concept of Composite Blur

    Magnification and Image Detail
     

  • Summary