Test 7

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

The higher the DQE, the more [blank_start]efficient[blank_end] the system is

The higher the frequency, the more penetrating the photon is

The higher the DQE = [blank_start]less[blank_end] radiation you use

From highest to lowest in efficiency of turning photons into light [blank_start]DR[blank_end] --> [blank_start]CR[blank_end] --> [blank_start]Screen[blank_end]

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

A DR system can produce how many shades of gray?

Window width: [blank_start]Controls contrast[blank_end] Window height: [blank_start]Controls density[blank_end]

What does a wide window width do?

What does a high window height do?

[blank_start]Contrast resolution[blank_end]: Visibility of detail [blank_start]Spatial resolution[blank_end]: Clarity, how clear a part it

[blank_start]Spatial resolution[blank_end]: measured by MTF [blank_start]Contrast resolution[blank_end]: measured by SNR

[blank_start]Amplitude[blank_end] is how much energy a signal has

As parts get smaller, blur [blank_start]increases[blank_end]

You can image objects smaller than the pixel size

The smaller the pixel size, the [blank_start]higher[blank_end] 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, [blank_start]increases[blank_end] SNR

In DSA, Signal [blank_start]increases[blank_end] with number of frames Noise [blank_start]increases[blank_end] proportionate to the square root of number of frames

[blank_start]Smaller[blank_end] parts require higher contrast to be seen [blank_start]Larger[blank_end] parts require lower contrast to be seen

[blank_start]Lumen[blank_end]: Total amount of light given off by source relative to the frequencies that the eye is sensitive [blank_start]Radiant light[blank_end]: The total amount of light given off by a source

Cosine law is also known as Lambert's law

Luminous intensity is proportional to the viewing angle

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

How do you compensate for image lag?

[blank_start]Annotation[blank_end]: adding text [blank_start]Image stitching[blank_end]: multiple image composite [blank_start]Image inversion[blank_end]: reverse polarity of an image [blank_start]Shuttering/cropping[blank_end]: post process "collimation"

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

Measures contrast and detail

Developed DICOM standard

Developed gray scale display function (GSDF) standard

Developed flat panel evaluation procedures and standards

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

[blank_start]Illuminance[blank_end]: measure of surface illumination [blank_start]Fluorescence[blank_end]: immediate light emission and cessation [blank_start]Phosphorescence[blank_end]: lag in emission and cessation [blank_start]Irradiance[blank_end]: radiant flux/unit area [blank_start]Luminescence[blank_end]: light from cold source

What determines gray scale?

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

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

"Dead in the water" if archive goes down

Only one person can read an image at a time

Remotely hosted electronic system accessed via an internet web browser

Most operations done at a remote server

Ability to customize system is limited

Acquisitions are stored locally until deleted

Not dependent on network for speed

Difficult to hack

one archive and no network

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

Most popular RAID

What RAID level is data mirrored?

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

What RAID level can handle multiple requests simultaneously?