Quality Assurance and Fault Analysis of Radiogrpahs Flashcards
What are the digital image receptor checks?
The receptor - check for visible damage and that it’s clean
Image uniformity
Image quality
What are common phosphor plate damages?
Scratches show white lines
Cracking from flexing shows network of white lines
Delamination shows white areas around the edge
What are common solid-state sensors damages?
Sensor damage shows white squares and straight lines
What are common film damages?
Black marks due to sensitisation of radiographic emulsion
Marks may represent nail marks, bite marks, fingerprints etc
Describe the step wedge check
Used to check image quality/contrast
Overlap the wedge with layered of lead foil
Exposed to a normal clinical exposure and and resulting image is compared to a baseline
Each overlapping layer must be distinguishable
Carried out regularly
What are the 3 parts of clinical image quality?
Image quality rating - grading each image
Image quality analysis - reviewing images to calculate success rate
Reject analysis - recording and analysing each unacceptable image
What are the different quality ratings of radiographs?
Diagnostically acceptable - A
Diagnostically not acceptable - N
What is fault analysis and give examples?
Identifying and explaining faults so they can be remedied
Eg - too dark or pale, distorted, receptor marks/damage
What is collimating error?
‘Cone cutting’
Incorrect alignment between X-ray tube and receptor holder
Incorrect orientation of the rectangular collimator
Describe incorrect image radiodensity
Image too dark or light
Many potential causes - exposure factors, developing film factors, viewing factors
