an initial evaluation of a radiographic film discovery and history of x-rays image perception...
TRANSCRIPT
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An initial Evaluation of a Radiographic film
• Discovery and History of x-rays• Image Perception• Radiographic densities• How to read a Radiograph (AABCS)• Describe a fracture and terminology• Mechanism of Injury• Lines and measurements
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Image perception• Searching for familiar identifiable patterns or a
combinations of patterns.• The success or failure of this process depends
on a number of factors:– Knowledge, Understanding and Experience.
• Anatomy and physiology• Abnormal and normal appearances .• Spatial awareness• Attenuating properties of structures• Image artefacts• Optical illusions
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Mach Band Effect
The Machband describes an effect where the human mind subconsciously increases the contrast between two surfaces with different densities.
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Radiographic Densities
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Pb BaSO4 Bone Muscle Fat Air
Different density material will attenuate different amounts of x-ray beam.
X-ray film
82 56 20 8
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How to read a Radiograph ?
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Film Viewing Box / Monitor
Ambient lighting
No distractions
Biscuits and coffee
Good Film ViewingConcentration on the part of the observer is crucial.
Physical discomfort due to poor ventilation
Excessive temp, Humidity
Anxieties, domestic and personal distractions
Poor health, workload can all effect diagnostic accuracy.
High priority is given to optimise image quality
How ever little thought is given to optimal image viewing conditions
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Why is it important to have TWO views.
Why do we need to examine all the views ?
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Some Useful Terms
• Abnormality• Asymmetry• Bilateral• Defect• Deformity• Degeneration• Demineralisation• Depressed• Deviated
•Diastasis•Discontinuity•Displacement•Disruption•Erosion•Extends through•Impaction•Irregularity•Intact•Malalignment
•Mild, Moderate Gross•Opacity•Radiolucent•Rotation•Unilateral
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Degree of Severity
• Minor• Mild• Low grade• Marginal• Partial• Extremely• Considerable• Pronounced• Marked• Severe• Gross• Excessive
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Progression/time related
• Acute• Chronic• Recent• Healed• Longstanding• Active• Aggressive• Developing• Deterioration• Improvement
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Direction of the Fracture Line
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Types of Fractures
• Buckle/Green Stick
• Comminuted
• Avulsion
• Pathological
• Stress
• Impacted
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Initial Evaluation of a Radiographic Film----------
• Name, Date, Anatomical markers, projections
• Overall size and shape of the bones– Consistent with age ,
sex, uniformity
• Thickness of cortex– thick at mid-shaft, Is it
visible all the way round.
• Density of the bone– Increased or decreased
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Bones• Step or break in the Cortex• Distortion of Trabecular pattern• Distortion of bone shape
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Cartilage and Joint space:
• Intra-articular involvement
• Look for Joint Space narrowing or widening
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Soft Tissue Swelling
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Film has edges
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There are certain normal anatomical relationships that can be measured or assessed for alignment. These can be of great benefit when trying to spot fractures.
Measurements and Lines
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the ankle…..
20 - 40°
Boehler’s AngleBoehler’s Angle
A
B
C
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Summary
• Start with an overall observation of your radiograph, pt. details, correct hand ?
• Think of the MOI, adult, child• Pitfalls- accessory ossicles• Consider soft tissue- occult fractures• Once you spot a fracture, carry on to
examine rest of the radiograph• Describe what you see• Use measurements and line to help you