Rad 1 Quiz 3 Review Flashcards
Other than underexposure, what is the artifact?
Grid lines
(usually due to moving grid; it is either moving too fast or NOT turned on)
Close up, it is not a processing problem, but what happens when you clean intensifying screens and put in wet?
Streaking- need to let them dry; wipe clean w/towel and drape towel over them to prevent dust from getting on it
What kind of screens and why shouldn’t they be used?
Split screens = unnecessary radiation exposure
What is the problem?
Light leak exposure
What is wrong?
Double exposure (Nasium and Base Posterior)
What is the small white thing?
Screen pitting/ cracked screen
What’s wrong?
Lack of film-screen contact
Notice how it is slightly blurry on
the bottom of the film
What are the little black dots from?
From static electricity (also note that the exposure is too light but can see some structures)
Note: ↑ kV 15% AND ↑ mAs 50%
Where is the dirt?
What is the wavy thing?
IN the cassette or ON the screen
Chemical splash on screen &
Dirt on screen
Note: Make sure to specify “IN” or “ON”
What are the artifacts?
Support layer of cassette is in backwards
P-A chest film; what is wrong?
Grid cut-off
Can occur from:
Tube shift (MC)
Using focused grid
Could also be due to a bent grid holder
FFD out of range = bilateral grid cut off
Parallel grid = bilateral grid cut off
Note:
NOTICE that one side is lighter than the other…notice the different color of air
Why are there 2 markers?
Double Exposure
What’s Wrong?
Cassette has fallen in tray
This film is underexposed, what is other problem?
Grid Lines
Note:
To fix the underexposure, Inc. kV 15% OR 2x mAs
What is wrong with this film?
Film Grain
Note:
Can be due to too fast of screens or too few photons (too high kV and too low mAs)
What is wrong?
Hair on screen
What’s wrong?
Static Electricity
Little black dots
What is wrong?
Grid Cut-Off
Note: Notice that ½ of the film is lighter on one side
What’s Wrong?
Pitting of screen (white blob) & cracks
Note: Static = Black; Pitting = White
What are these?
Types of static electricity marks
What’s on this film?
Thumbnail mark (black kink artifact) from bending film
What will this cause?
Kinks
What is wrong w/this film?
Film grain or quantum mottle (MC cause is due to too fast of screensà creates a loss of photographic detail)
This is a close-up of the previous film…what is it showing?
Film Grain
