Transcript Image Evaluation - Jefferson State Community College

Image Evaluation
Guidelines for Image Analysis
Chapter 1
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Facility’s Id
Correct marker
Required anatomy
Accurate projection/position
No unwanted distortion
Cortical Outlines sharp
Collimation
Radiation Protection
IR size & alignment
Correct IR system
Density & penetration
Image contrast
No preventable artifacts
Properly ordered
Requisition & Post-procedure
Facility’s ID
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Facility’s name
Patient’s name, age or birth date
Exam time and date
ID plate * outside collimated field
* away from direction CR is angled
* next to narrowest anatomical
Marking Images
• Within collimated field?
• Best position?
• Accurate *Screen film
*Digital
* Is Required anatomy present
on image?
Patient Obliquity & Extremity Flexion
• Accurate position
demonstrated
• Imaginary line
• Degree of extension
Shape Distortion
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CR
Elongation
Foreshortening
Joint spaces
Poor positioning * magnified structure
Helpful Hints
• Use a grid if part thickness is over 5 inches
and over 70 kVp is used
• Small to medium plaster cast
• +5-7 kVp +50-60% mAs
• Large plaster cast
• +8-10 kVp + 100% mAs
• Fiberglass cast
• +3-4 kVp + 25-30% mAs
Detail Sharpness
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Small focal spot
Unwanted motion
No magnification
Detail screen
Poor screen film contact
If CR is used; small possible IR
Collimation
• All four sides
• Within ½ inch of
skinline
• To specific anatomy on
torso
• All required anatomy
visible
Radiation Protection
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Present
Accurate for male and female
Tight collimation
Anatomical artifacts
Personnel protected
• * IR positioned CW or LW properly
Body Habitus
• CW or LW
• Smallest IR, multiple
positions
• Aligned in same
direction
• Correct IR system
Density & Penetration
• Optimal density
• Overexposure & Underexposure
• Changing penetration
• Hypothetical conversation
• Compensating filter or anode heel effect
Guidelines for Digital
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Correct diagnostic specifier for anatomy
For non-routine correct specifier
Center structure
Do not overlap collimation edges
Collimate tightly
Image Contrast
• Bony & soft tissue
• Amount of scatter
controlled
Ordered Procedure
• Postprocedure
• Repeat or reject
analysis