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Ch 25 Bushong

Computed rad. Physics

QuestionAnswer
______________ is the activator of the photostimulable phosphor. Europium
______________ first introduced Digital Radiography in _________? Fuji, 1981
What is another name for the computer radiography cassette? Imaging Plate
CR cassettes and film screen cassettes are NOT interchangeable with an x-ray imaging system. T or F False
What are the CR readers main component modules? Mechanical, optical and computer modules
What happens to the excited electrons after laser stimulation? about 50% of them return to their ground state
Where is the PSP screen read? in a reader!
When should the digital imaging plate be used after erasure? immediately or shortly after
What should you do to a casette if you dont know how long it has been setting on the shelf? Erase it before you use it!
Give an example of the optical features or module. The laser
The 4 steps to creating an image with CR are: Metastable state, _________, ____________ and _______. stimulate, read, and erase
When does a photostimulable phosphor in a metastable state emit light? immediately, over time and when stimulated by a light source
What does the CR plate and the screen film plate have in common? They both produce a latent image
What is the main source of noise on a CR image? Scatter radiation
How do you erase an imaging plate? Flood it with a very bright light source
How do you prevent ghosting? Same as the erasure of the image plate, flood it with a light source
What is the constant in CR, no matter how you adjust the technique? contrast
The CR image has a ________ latitude and __________ __________. wide. improved contrast
What step can be eliminated when going from film screen to CR screen? loading the cassette!
How many levels of gray are produced on a CR image 10,000
The output of the photodetector is a time varying digital signal that is transmitted to a computer system. T or F false! Its an analog system
What is needed to produce a higher level of spatial resolution? the laser beam
In screen film radiography, the _________ _____ is a scintillator that emits light in response to an x-ray interaction. intensifying screen
Spatial resolution, contrast resolution, noise and artifacts are 4 main characteristics of any medical image. T or F True!
How many shades of gray can a person visualize on a CR image? approximately 30
What characteristic does the CR image and the screen film image have in common? Image noise
By using CR or DR, what changes are beneficial? Lower repeat rate, increased contrast resolution, decreased patient dose, less work on the technologist
Created by: radgirl37
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