module II
With the PSP image detector, this device collects the light as the laser beam scans across the plate during the reading process
What is the light guide assembly
In regards to display monitors, which one has been around for a long time?
CRT-Cathode Ray Tube has been around much longer than the LCD-liquid crystal display
The appearance of a digital image can be affected by several factors. Name 3 of them
What are underexposure/quantum mottle, overexposure/saturation, scatter radiation, grid cut-off, motion
Other factors include: exposure field recognition error, unexpected attenuator, menu selection
Provides more security because cant be accessed by anyone outside that network
What is a LAN
local area network
This value represents the exposure received by the IR
What is the exposure index?
TFT's are utilized in both direct and indirect flat panel IR's. What is their function?
What is to collect the electronic signal and send it to the ADC
There are several characteristics of the monitor that affect the display. Name 3 of them
What is:
spatial resolution, vertical and horizontal resolution, size of display, aspect ratio, matrix ratio, pixel size, pixel pitch
This occurs when the computer fails to identify the collimated borders of an image
What is an exposure field recognition?
focuses on the standards for transmitting text-based information throughout the medical center
What is HL7?
This is the largest storage device in PACs and considered long term
What is jukebox?
With the PSP image receptor, this device converts the light emitted from the phosphor into an electrical signal which is sent to the ADC where it is sampled and assigned a discrete numerical value
What is a CCD, photomultiplier tube/photodiode
Display size plays a role in resolution. The screen of this monitor is measured diagonally from corner to corner of the outside edges of the display casing
What is the CRT monitor?
Selecting the ________ that does not correlate to the exam being performed can produce a pleasing image, however, can lead to medicolegal concerns
What is the correct image processing menu?
A paper or electronic system that manages the administrative, financial, and clinical information necessary to operate a hospital or health care system
What is a Health Information System?
Can also be referred to as a clinical information systemThis extension of PACs allows the viewing and interpretation of exams off site
What is teleradiography?
The x axis or horizontal line represents the receptor exposure
The y axis or the vertical line represents the # of pixels
and together they form....
What is the histogram?
This display characteristic refers to the proportional relationship of width and height of the display monitor
What is the aspect ratio?
CRT: 4:3
LCD: 16:9
This feature can be helpful when assessing the presence of image blur
What is the zoom feature?
The ability to retrieve prior exams from a long-term archive is referred to as
What is prefetching?
The difference between the maximum and minimum luminance of a display screen is referred to as
What is contrast resolution?
The gradual increase of patient exposure over time due to the lack of visual cues is referred to as
What is dose creep?
To accurately display the gray scale in a radiograph the display monitor needs to be able to demonstrate at least _________ shades of gray
What is 256 shades of gray?
Equivalent to 8 bits
Displayed using a scale of -3 to 3, this represents the IR's exposure as compared to the reference histogram's exposure
What is the deviation index?
What is RAID?
redundant array of independent discs
PACs uses RAID as its 'near term' storage
Uses a retrieval arm to grab the media, place it in a drive to be read and transmitted to PACs as requested
What is jukebox storage