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RADT 465

Image Production & Evaluation

What causes film fog? Excessive temperatures. pg 382
Examples of handling artifacts: Crinkle marks and static electrical discharge. pg 383
T/F: Pt's name/ID #, marker, examination date, institution's name & pt's DOB are required on each x-ray. False. Pt's DOB is optional. pg 384
List the order of film processing. Developer, fixer, washer & dryer. pg 385
A ______ is a graphic representation of pixel value distribution. Histogram. pg 394
T/F: PSPs are the detectors used in CR. True. pg 398
The developer temperature in a 90-second automatic processor is approximately? 90-95F. pg 401
Name a cause of CR graininess. Underexposure, incorrect processing algorithm/LUT, excess scatter radiation, inadequate collimation, grid misalignment/cutoff. pg 405
T/F: brightness changes with changes in window width False. Window level. pg 407
IP's that have not been used in ___ hours should be erased before use. 48. pg 408
What does APR stand for? Anatomically programmed radiography. pg 408
Overexposure of up to ___% and underexposure of up to ___% are reported as recoverable, thus eliminating most retakes. 500; 80. pg 406
The invisible latent image is converted into a visible manifest image in the? Developer. pg 401
Visibility factors: Density/Brightness & Contrast/Gray Scale. pg 298
Geometric factors: Detail/Resolution & Distortion. pg 298
2 types of shape distortion: Foreshortening and elongation. pg 303
The finite area on the tungsten target that is actually bombarded by electrons from the filament. Actual focal spot. pg 305
When using a smaller anode angle, a ____ actual anode area can be bombarded. Larger. pg 306
Examples of involuntary motion: peristalsis, muscle spasms and heart beats. pg 309
Quantum mottle is most likely to occur when using fast screens with __ mAs and __ kVp. Low; high. pg 313
Any combination of mA and exposure time that will produce a particular mAs, will produce identical image density. Reciprocity Law. pg 317
An underexposed or overexposed film image requires an mAs increase or decrease of at least ___%. 30. pg 317
mAs is _____ proportional to image density. Directly. pg 317
What formula do you use to find image intensity? Inverse Square Law. pg 319
When mAs manipulation is not possible, density can be doubled or halved by using the? 15% rule. pg 321
Device used to absorb a large percentage of scatter radiation before it reaches the IR. Grid. pg 323
What is the most effective way to decrease scatter radiation? Collimation. pg 329
Grids can be stationary or moving, parallel, or? Focused. pg 329
Used to provide more uniform density. Compensating filter. pg 330
The glass envelope and collimator is what type of filtration? Inherent filtration. pg 330
Created by: Ammerkel