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Ch 25

Digital Radiography

_____ acquisition systems directly convert incoming x-ray photons to an electronic signal. Direct
A scintillator converts ____ photons into ____. x-ray; light
The cassette based system uses what kind of plate? photostimulable storage phosphor imaging plate (PSP)
Computed radiography is considered ____ digital. indirect
Cassette-less systems are considered ____ digital radiography because the detector and reader are a permanent part of a table or wall unit. direct
A photodetector converts ____ into an _____ signal. light; electronic
What problems occured when CR first came out? high cost and poor image quality
What are the six layers of the photostimulable imaging plates? protective, phosphor, conductor, support, light shield and backing layers.
PSP plates are more sensitive to _____ than film. scatter (absorbs more low energy photons)
The most common phosphor with characteristics favorable for CR is _____ and ____ with europium activators. barium fluorohalide bromides; iodides.
The latent image will lose about ___% of its energy in ___ hours 25;8
The incident x-ray beam produces a ____ image within the photostimulable flurohalides that comprise the active layer of the imaging plate in the cassette. latent
It is the responsibility of the radiographer to select proper ____. technique
The latent image on a imaging plate has a wider ____ than that on film. latitude