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Digital Img Final

QuestionAnswer
What type of wavelength do large objects have? Long
Does a long wavelength represent a low or high frequency? Low
The number of up and down cycles across an entire row of pixels Frequency of the waveform
Decomposing the original image into 8 or more frequency layers, performing various operations on selected individual layers and recomposing the image Multiscale processing
What type of mottle is band pass filtering best for? electronic mottle
While applying a kernel, if the numbers are both positive and negative, and the sum equals 1.0, what does that result in? edge enhancement
The radiographer should routinely reprocess an image under different algorithms to obtain the highest quality False
This post processing feature removes some of the smallest details and reduces noise smoothing
this post processing feature increases local contrast to better visualize small details edge enhancement
this post processing feature subjectively brings out details by changing black to white and white to black on the image image reversal
System A has a speed of 400, while system B has a speed of 200. Which system requires less exposure and reduces patient dose? System A
In digital radiography you can't rely on how dark or light your image looks as an exposure indicator. True
A high exposure indicator number represents an under exposed image False
mAs and kVp are controlling factors in digital imaging false
electrical phenomenon that occurs at the detector when the dexels in a particular area have reached the maximum electrical charge that they can store saturation
A DR unit can capture, process and display the initial image true
In DIRECT conversion DR, the dexel is made of amorphous selenium True
In INDIRECT conversion DR, the dexel is made of amorphous selenium false, it's amorphous silicon
Amorphous silicon better absorbs light than xrays true
at the bottom electrode plate, the positive charge accumulates and moves to the what? capacitor
lines connected to an address drive, which tracks location of each dexel in each row are gate lines
in CR, residual electrons can get trapped in molecular _____, causing the plate to flow a second time F centers
The direction in which the PSP plate moves, it sets the length of the pixel slow scan
The PSP plate has no defined pixels or dexels True
The distance from the center of one pixel to the center of another pixel Pixel pitch
How many pixels does it take to make a detail? 2
In a row of 20 pixels, how many details can you make? 10
In a hardware matrix the size of pixels or dexels can be subject to change false
geometric artifacts caused by certain sampling frequencies moire patterns
A computer terminal that can access images for display, but can also adjust image quality and permanently save those changes in PACS workstation
for accurate reading in the radiologist office the lux should not exceed 25
picture archiving and communication system PACS
all of the associated database information behind each image and included details metadata
What are negative side effects of image compression lose smaller image details, increases image noise
a lossless compression ratio is a ratio less than 8:1
diagnostic work stations have a higher storage capacity than acquisition units true
correctly orient displayed images according to type of exam and can be customized by each radiologist intelligent hanging protocols
the 3 basic elements of security privacy, authentication and system integrity
2 parts of HIS clinical information system and administrative information system
a set of rules that facilitate the exchange of data between the different anodes of a computer network protocol
2 most common types of modern fluoroscopes dynamic flat panel and image intensifier
early CMOS produced inferior image quality true
Moving the image receptor as close to the patient as possible in a fluoroscopy room _____ reduces OID
which type of fluoroscopy unit requires a recording camera to be mounted to the top of it image intensifier
What is the rate at which data can be transferred through any system bandwidth
What is the typical matrix size of a CCD 2048x2048
CMOS sensor consists of individual dexels true
These are represented as black spots on your image/screen stuck pixels
these are represented as white spots on your image/screen dead pixels
statistical noise that is inherent to the DR detector intrinsic noise
Created by: abgriz81
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