Image Evaluation

velodromeryeUrban and Civil

Nov 15, 2013 (3 years and 11 months ago)

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Image Evaluation

Guidelines for Image Analysis


Chapter 1


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


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


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


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


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


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