Test 7

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( Absorption coefficient, Detective quantum efficiency (DQE) ): Determines how far into a material photons of a particular wavelength can penetrate before it is absorbed
( Detective quantum efficiency (DQE), Absorption coefficient ): The percentage of photons absorbed in a material per given exposure

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The higher the DQE, the more ( efficient, inefficient ) the system is

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The higher the frequency, the more penetrating the photon is

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The higher the DQE = ( less, more ) radiation you use

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From highest to lowest in efficiency of turning photons into light
( DR, CR, Screen ) --> ( CR, DR, Screen ) --> ( Screen, DR, CR )

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How many shades of gray can be produced by a photon beam?

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A DR system can produce how many shades of gray?

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Window width: ( Controls contrast, Control density )
Window height: ( Controls density, Controls contrast )

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What does a wide window width do?

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What does a high window height do?

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( Contrast resolution, Spatial resolution ): Visibility of detail
( Spatial resolution, Contrast resolution ): Clarity, how clear a part it

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( Spatial resolution, Contrast resolution ): measured by MTF
( Contrast resolution, Spatial resolution ): measured by SNR

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( Amplitude, Frequency ) is how much energy a signal has

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As parts get smaller, blur ( increases, decreases )

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You can image objects smaller than the pixel size

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The smaller the pixel size, the ( higher, lower ) the frequency

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The ratio of photons hitting the phosphor and the number that stays in the phosphor is known as what?

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In radiography, increase mAs, ( increases, decreases ) SNR

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In DSA,
Signal ( increases, decreases ) with number of frames
Noise ( increases, decreases ) proportionate to the square root of number of frames

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( Smaller, Larger ) parts require higher contrast to be seen
( Larger, Smaller ) parts require lower contrast to be seen

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( Lumen, Radiant light ): Total amount of light given off by source relative to the frequencies that the eye is sensitive
( Radiant light, Lumen ): The total amount of light given off by a source

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Cosine law is also known as Lambert's law

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Luminous intensity is proportional to the viewing angle

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Before you see the image, the computer does these three things:

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How do you compensate for image lag?

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( Annotation, Image stitching, Image inversion, Shuttering/cropping ): adding text
( Image stitching, Image inversion, Shuttering/cropping, Annotation ): multiple image composite
( Image inversion, Shuttering/cropping, Annotation, Image stitching ): reverse polarity of an image
( Shuttering/cropping, Annotation, Image stitching, Image inversion ): post process "collimation"

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Developed test pattern to visually assess picture detail and contrast for monitors

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Measures contrast and detail

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Developed DICOM standard

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Developed gray scale display function (GSDF) standard

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Developed flat panel evaluation procedures and standards

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( TG 18-PX, TG 18-LN, TG 18-QC, TG 18-CX ): resolution uniformity
( TG 18-LN, TG 18-QC, TG 18-CX, TG 18-PX ): luminance (glare, uniformity, reflection, etc.)
( TG 18-QC, TG 18-CX, TG 18-PX, TG 18-LN ): Geometric distortion
( TG 18-CX, TG 18-PX, TG 18-LN, TG 18-QC ): resolution

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( Illuminance, Fluorescence, Phosphorescence, Irradiance, Luminescence ): measure of surface illumination
( Fluorescence, Phosphorescence, Irradiance, Luminescence, Illuminance ): immediate light emission and cessation
( Phosphorescence, Irradiance, Luminescence, Illuminance, Fluorescence ): lag in emission and cessation
( Irradiance, Fluorescence, Phosphorescence, Illuminance, Luminescence ): radiant flux/unit area
( Luminescence, Illuminance, Fluorescence, Phosphorescence, Irradiance ): light from cold source

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What determines gray scale?

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( Client-server based, Server, Client ): the client provides the software for operation
( Server, Client-server based, Client ): a program application that allows the sharing of data with other programs
( Client, Client-server based, Server ): a program that can accept and use data from a server

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Which of the following has no storage capability at work station?

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"Dead in the water" if archive goes down

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Only one person can read an image at a time

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Remotely hosted electronic system accessed via an internet web browser

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Most operations done at a remote server

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Ability to customize system is limited

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Acquisitions are stored locally until deleted

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Not dependent on network for speed

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Difficult to hack

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one archive and no network

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( Multiplanar reconstruction (MPR), Minimum intensity projection (MiniIP), Volume rendering technique (VRT), Shaded surface display (SSD), Maximum intensity projection (MIP) ): using data from one plane to produce an image in another plane
( Minimum intensity projection (MiniIP), Multiplanar reconstruction (MPR), Volume rendering technique (VRT), Shaded surface display (SSD), Maximum intensity projection (MiniIP) ): accentuates air filled structures
( Volume rendering technique (VRT), Multiplanar reconstruction (MPR), Minimum intensity projection (MiniIP), Shaded surface display (SSD), Maximum intensity projection (MIP) ): color conversion
( Shaded surface display (SSD), Multiplanar reconstruction (MPR), Minimum intensity projection (MiniIP), Volume rendering technique (VRT), Maximum intensity projection (MIP) ): filtering or windowing
( Maximum intensity projection (MIP), Multiplanar reconstruction (MPR), Minimum intensity projection (MiniIP), Volume rendering technique (VRT), Shaded surface display (SSD) ): accentuates contrast media filled vessels

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Most popular RAID

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What RAID level is data mirrored?

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What RAID level is not used much (cannot handle multiple queries)?

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What RAID level can handle multiple requests simultaneously?

Test 7

Test 7

The higher the DQE, the more efficient inefficient( efficient, inefficient ) the system is

The higher the frequency, the more penetrating the photon is

The higher the DQE = less more( less, more ) radiation you use

From highest to lowest in efficiency of turning photons into light DR CR Screen( DR, CR, Screen ) --> CR DR Screen( CR, DR, Screen ) --> Screen DR CR( Screen, DR, CR )

How many shades of gray can be produced by a photon beam?

A DR system can produce how many shades of gray?

Window width: Controls contrast Control density( Controls contrast, Control density ) Window height: Controls density Controls contrast( Controls density, Controls contrast )

What does a wide window width do?

What does a high window height do?

Contrast resolution Spatial resolution( Contrast resolution, Spatial resolution ): Visibility of detail Spatial resolution Contrast resolution( Spatial resolution, Contrast resolution ): Clarity, how clear a part it

Spatial resolution Contrast resolution( Spatial resolution, Contrast resolution ): measured by MTF Contrast resolution Spatial resolution( Contrast resolution, Spatial resolution ): measured by SNR

Amplitude Frequency( Amplitude, Frequency ) is how much energy a signal has

As parts get smaller, blur increases decreases( increases, decreases )

You can image objects smaller than the pixel size

The smaller the pixel size, the higher lower( higher, lower ) the frequency

The ratio of photons hitting the phosphor and the number that stays in the phosphor is known as what?

In radiography, increase mAs, increases decreases( increases, decreases ) SNR

In DSA, Signal increases decreases( increases, decreases ) with number of frames Noise increases decreases( increases, decreases ) proportionate to the square root of number of frames

The higher the DQE, the more ( efficient, inefficient ) the system is

The higher the DQE = ( less, more ) radiation you use

From highest to lowest in efficiency of turning photons into light
( DR, CR, Screen ) --> ( CR, DR, Screen ) --> ( Screen, DR, CR )

Window width: ( Controls contrast, Control density )
Window height: ( Controls density, Controls contrast )

( Contrast resolution, Spatial resolution ): Visibility of detail
( Spatial resolution, Contrast resolution ): Clarity, how clear a part it

( Spatial resolution, Contrast resolution ): measured by MTF
( Contrast resolution, Spatial resolution ): measured by SNR

( Amplitude, Frequency ) is how much energy a signal has

As parts get smaller, blur ( increases, decreases )

The smaller the pixel size, the ( higher, lower ) the frequency

In radiography, increase mAs, ( increases, decreases ) SNR

In DSA,
Signal ( increases, decreases ) with number of frames
Noise ( increases, decreases ) proportionate to the square root of number of frames

( Smaller, Larger ) parts require higher contrast to be seen
( Larger, Smaller ) parts require lower contrast to be seen

( Lumen, Radiant light ): Total amount of light given off by source relative to the frequencies that the eye is sensitive
( Radiant light, Lumen ): The total amount of light given off by a source