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RADT 465
Image Production & Evaluation
Question | Answer |
---|---|
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 |