Digital Radiography Flashcards
Is photographing radiographs with an iPhone an example of digital radiography?
No
Is running radiographs through a digitizer an example of digital radiography?
No
A map of x-ray transmission converted to a digital matrix is known as what?
Digital Image
What is the term for each row and column intersection in a digital image?
Pixel
T/F: The more pixels/area the lesser the detail.
False - The more pixels/area the greater the detail.
Do pixels need to be smaller or larger than the lesion in order to be seen on the digital radiograph?
Smaller
Pixels must be what in order to obtain good resolution?
Small
To assign for contrast resolution, there must be what?
A large number of grey shades.
What does DICOM stand for?
Digital Imaging Communications in Medicine
What is DICOM?
A file format.
What do you need in order to view digital imaging files?
DICOM viewing software
Are DICOM files small or large?
Large
What does DR stand for?
Digital Radiography
What does CR stand for?
Computed Radiography
What does DDR stand for?
Direct Digital Radiography
Cassettes used in a CR must be processed in what?
How long does it take?
- A plate reader
- 90 sec per plate
Does a DDR need a cassette?
Plate reader?
- No
- No
How long does it take for the image to be available with a DDR?
Available immediately
The extent to which a film, image plate or flat panel can be over or underexposed and still achieve an acceptable result is known as what?
Exposure latitude
A small increase in exposure can result in what?
Overexposure
A small decrease in exposure can result in what?
Underexposure
With digital systems, the relationship between exposure and blackness is more or less steep compared to conventional film?
Less
Which has a narrower margin of error: film/screen or digital?
Film/screen
Do you have to be more or less precise with digital?
Less precise
T/F: Exposure latitude does not mean that exposure factors are not important.
True
A low exposure image has more what?
“noise”
Which has a lower exposure: 0.5 mAs or 4 mAs?
0.5 mAs
If an image is underexposed, is it more or less grainy?
More grainy
What can happen when a plate becomes overexposed and “saturated”?
Anatomy disappears (image dropout)
The range of light intensities a medium can capture is known as what?
Contrast optimization
Contrast optimization does what to the image?
Evens out the entire image.
What is the ability to change the image contrast and blackness after acquisition is known as what?
Post processing
Are exposure factors lower, about the same or higher than with digital radiography compared to film-screen systems?
About the same
Will artifacts and other technical problems be less with digital radiography?
No
What does PACS stand for?
Picture Archive and Communication System
What has revolutionized radiographic imaging in veterinary medicine?
Digital radiography
