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Terms in this set (24)
What is radiographic quality?
The ease with which details can be seen on a radiograph
What are four factors that effect radiographic quality and detail?
What is radiographic density?
The degree of blackness on a radiograph
How would you describe a radiograph with many black areas?
What makes radiographic film black?
What influences density?
The quantity(MA) and the quality(KVP) of the beam and the type and thickness of tissue
What can you increase to produce greater radiographic density?
Temperature of developer
What does radiopaque mean?
It looks white
What does radiolucent mean?
It looks black
What is the most radiopaque on film?
What is the most radiolucent?
What is contrast?
Visible difference between two adjacent radiographic densities
What are the two types of contrast?
Radiographic and subject
What are the five factors that influence radiographic contrast?
What is contrast primarily dependent on?
What device helps absorb scatter?
Whats a grid composed of?
Alternating strips of lead and spacer material in a protective cover
What needs to be increased when grids are used to maintain radiographic density?
When are grids typically used?
When the body part being radiographed exceeds 10 centimeters
What are the two factors that affect radiographic definition and detail?
Geometric unsharpness, distortion, and magnification
What is geometric unsharpness?
Loss of detail due to distortion
What can cause distortion?
Certain film/screen combinations
Large focal spots
How can we avoid distortion?
Place focal spot of beam directly above object and centered on point of interest
When does foreshortening most commonly occur?
Radiographing dogs for hip dysplasia
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