Viewing radiographs Flashcards
What are the different types of radiography?
Conventional radiographs
Digital radiographs
Fluoroscopy
How are conventional radiographs viewed?
As a film using a light box
How are digital radiographs viewd?
Only as computer files on a monitor
What are the different types of digital radiography?
Computed radiography (CR) Direct radiography (DR)
What is fluoroscopy?
Image intensifier electronically amplifies screen image viewed on a TV monitor providing moving radiographic images
What is the structure of a conventional x-ray receptor?
Consists of a screen and a film inside a cassette
How to x-rays expose the film of conventional radiographs?
Predominantly through their effect on the screens
What process does a conventional radiograph film need to go through before it can be looked at?
Developer
Fixative
Wash
How does computed radiography work?
Exposed cassette is registered to a patient ID and then put through an ADC compact which reads the cassette and pairs the image up with the patient ID then the cassette is erased and returned for another use at the x-ray table and the image can be viewed at a monitor connected to the system
How does digital radiography work?
Detectors convert x-rays into electrical charges more or less directly enabling portable radiography
What is the photographic density of a radiograph?
The degree of blackening of the film
What is the contrast of a radiograph?
The range of grey shades in a radiograph
Low contrast = few shades
High contrast = lots of shades
What is the resolution of a radiograph?
Capacity of a radiograph to render detail
Low resolution images described as blurred
What are the Rontgen signs?
Number Position Size Shape Opacity Margination
What are the Rontgen signs used for?
Looking for abnormalities in radiographs
