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New 17-18 bushong

Rad technique digital

Question	Answer
The two principal characteristics of a medical image are	Spatial resolution and contrast resolution
Spatial frequency is used to describe the quality of spatial resolution in terms of	line pairs
in digital imaging, spatial resolution is ultimately limited by	pixel size
As spatial frequency increases the object size _ and the spatial resolution _	decreases, increases
A _ test tool is used to acquire data for an MTF curve	Bar pattern
The use of two screens in imaging results in higher	MTF
The number of gray shades that an imaging system can reproduce is called its	dynamic range
Screen film radiography has a dynamic range of	1,000
The bit capacity of each pixel identifies the _ of a digital imaging system	dynamic range
The _ digital imaging system uses the highest dynamic range.	mammography
The portion of useful image forming x-rays is referred to as the	signal
As mAs is increased the signal to noise ratio is	increased
Image detail is also called	spatial resolution
Of all radiography imaging systems, _ has the best contrast resolution	computed tomography
With digital imaging, patient dose can be reduced by using higher _ techniques	KVP
DQE is _	detective quantum efficiency
If an image receptor has a high probability of interacting with the x-ray beam, then it has a high _	DQE
The use of an image receptor with _ DQE can result in _ patient doses	High, lower low, and higher
The science of _ is the study of the response of the human eye to light	Photometry
What is the basic photometric unit?	Lumen
The decreasing luminous intensity with increasing distance from the source of light follows_	the inverse square law
T/F A digital display device with higher megapixels has a better spatial resolution	True
Almost all medical flat panel digital display devices are _	Monochrome liquid crystal displays
Medical flat panel display devices are identified by the _	# of pixels
The ambient light a digital image workstation should be _	near darkness
Flat-fielding is accomplished through automatic calibration images are called _ and	offset images, and gain images
Re-registering an image to correct for patient motion is done with	pixel shift
A computation of the mean pixel value within a region-of-interest is performed for _	quantitative radiology
Post-processing includes all of the following except _	signal interpolation
_ is corrected by the application of an offset voltage	Image lag
Within PACS network the secretarial workstation and the viewing workstation would be both called	clients
Text data and email are generated at a _ workstation in PACS.	RIS
Image file size is determined by _ size and gray scale	matrix
What is the file size of an image with 1026 x 1026 matrix and 2.5 byte gray scale	2.6 mb
What is the spatial frequency of a digital system that can resolve 100um	10 lp/mm
If a digital system has a spatial resolution of 4 lp/mm, it can resolve an object as small as _ mm	4
If a digital radiography imaging system has a spatial resolution of 10 lp/mm, what is the pixel size of that system?	0.05 mm
If there were such thing as a perfect imaging system, the MTF would be equal to _	1

Created by: MARCOZING

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