Digital radiography Flashcards
Can a conventional x ray table be used for digital imaging?
YES
More pixels per area = greater ______
detail
also means bigger file size
Pixels must be (large or small) to obtain good resolution?
Small
Digital image files are in what format?
DICOM
digital image communications in medicine
**must have a DICOM viewing software to open images
What is the difference between computed radiography and direct digital?
Computed requires cassettes that are processed via a plate reader
What are some pros to having a direct digital radiography system?
No cassette to process No plate reader Image available immediately Post processing Consultations Exposure latitude Contrast optimization
*flat panel - very convenient
What does the processing algorithm of a digital x ray system control?
Contrast
T/F: The inherent detail of a film image is better than a digital image
TRUE
Digital will have more contrast (not the same as detail)
What is exposure latitude?
The extent to which a film, image plate or flat panel can be over or under exposed and still achieve an acceptable result
T/F: Analog radiography has a better exposure latitude than digital
FALSE
What image would have more ‘noise’: an image shot at 1.5 mAs or an image shot at 6 mAs?
The image at 1.5 mAs - this results in a lower exposure, which will have more noise
T/F: there is a limit to plate over exposure
TRUE
the plate can become saturated and anatomy will disappear
What is contrast optimization?
The range of light intensities a medium can capture
- in this application of additional processing - dark regions are made lighter and lighter regions are made darker
T/F: Exposure factors are lower when using a digital radiography system than when using film-screen systems
FALSE
What is a PACS system?
Picture Archive and Communication System
-its a host of technologies that contribute to image creation, distribution/viewing, and archiving
