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Ch 25
Digital Radiography
| Question | Answer |
|---|---|
| _____ 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 |
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