Lec 5 Common Cause of Faulty Radiographs Flashcards
1
Q
- Underdevelopment (temperature too low; time too short; thermometer inaccurate)
- Depleted developer solution
- Diluted or contaminated developer
- Excessive fixation (hours)
A
Light radiographs
2
Q
- Insufficient mA
- Insufficient kVp
- Insufficient exposure time
- Film-source distance too long
- Film packet reversed in mouth
A
Light radiographs (underexposure)
3
Q
Processing Errors
- Overdevelopment (temperature too high; time too long)
- Developer concentration too high
- Inadequate time in fixer
- Accidental exposure to light
- Improper safelighting
- Storage of films without shielding, at too high a temperature, or past expiration date
A
Dark radiographs
4
Q
- Excessive mA
- Excessive kVp
- Excessive exposure time
- Film-source distance too short
A
Dark radiographs (overexposure)
5
Q
- Underdevelopment
- Underexposure
- Excessive kVp
- Excessive film fog
A
Insufficient contrast
6
Q
- Improper safelighting (improper filter; excessive bulb wattage; inadequate distance between safelight and work surface; prolonged exposure to safelight)
- Light leaks (cracked safelight filter; light leaks from doors, vents, or other sources)
- Overdevelopment
- Contaminated solutions
- Deteriorated film (stored at high temperature; stored at high humidity; exposed to radiation; past expiration date)
A
Film fog
7
Q
- Fingerprint contamination
- Protective wrapping paper sticking to film surface
- Film in contact with tank or another film during fixation
- Film contaminated with developer before processing
- Excessive bending of film
- Static discharge to film before processing
- Excessive roller pressure during automatic processing
- Dirty rollers in automatic processing
A
Dark spots or lines
8
Q
- Film contaminated with fixer before processing
- Film in contact with tank or another film during development
A
Light spots
9
Q
- Depleted developer
- Depleted fixer
- Insufficient washing
- Contaminated solutions
A
Yellow or brown stains
10
Q
- Movement of patient
- Movement of film (film not stabilized)
A
Blurring
11
Q
- Top of film not immersed in developing solution
- Misalignment of x-ray tube head (“cone-cut”)
A
Partial images
12
Q
- Abrasion of image during processing
- Excessive time in wash water
A
Emulsion peel
