Chapter 8 Flashcards
What does a wide dynamic range mean?
A wide dynamic range means that a wide range of exposure settings will produce an image of acceptable density and contrast.
What does a narrow dynamic range mean?
A narrow dynamic range means that the exposure settings must be relatively precise to capture an image at an acceptable density and contrast.
Are both statements about dynamic range true?
Yes, both statements are true.
What determines the quality of a digital image?
The quality of a digital image is determined by a combination of pixels, gray scale, and spatial resolution.
Which image receptor is the least sensitive to radiation?
CCD sensors are the least sensitive to radiation and require more exposure to produce an image.
What determines spatial resolution in a digital image?
The size and number of pixels determine the spatial resolution, which is measured in line pairs.
Are there two methods of acquiring a digital image?
True.
Do CCD and CMOS-APS sensors work equally well?
True.
Does direct digital imaging use film?
False. Direct digital imaging does not use film.
Is each pixel a single dot in a digital image?
True.
Can most digital imaging systems be used with conventional x-ray machines?
False.
Are solid-state digital sensors available wired or wireless?
True.
Are CMOS-APS and CCD types of direct digital sensors?
True.
What does line pairs refer to?
False. Line pairs refer to the discernable separation of closely adjacent image details.
Does digital radiography require a computer and monitor?
True.
Does a lower number of line pairs per millimeter indicate better spatial resolution?
False.
What is the purpose of digital subtraction?
Digital subtraction is a technique that permits comparison of digital images to detect changes over time.
What is the digital equivalent of film fog?
Electronic noise is the equivalent of film fog.
What are the advantages of digital radiography?
Advantages include less radiation required, instant viewing, elimination of darkroom processes, and improved diagnostic images.
