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RAD107 Exam 1

QuestionAnswer
beam quantity mAs
beam quality kVp
small effective focal spot Line Focus Principle
Single-phase waveform has ____ ripple  100%
Three-phase, six-pulse has _____ ripple ~14%
Three-phase, twelve-pulse has ____ ripple ~ 4%
high- frequency waveform has ____ ripple <1%
Lower voltage ripple = higher x-ray beam quality & quantity
Radiation Quantity intensity
Radiation Quality penetrability
What occurs when tungsten vapor coats the inside of the glass envelope? Arcing
What is the main cause of anode cracking A single, large image exposure
What is the main cause of filament burnout? High mA use for long periods
What is the main cause of cracking in an anode? Excessive heat
The release of electrons from the heated filament: Thermionic Emission
Automatically terminates exposure once enough radiation reaches the image receptor AEC
Converts AC to DC for x-ray tube operation Rectification Components

Uses 0s and 1s Binary system
8 bits = A byte
Remote transmission of images for interpretation. Teleradiology
CR uses _____ plates PSP - photostimulable Phosphor
How do you prevent "ghosting" in CR imaging using a bright light to flood the plate (erasure)
The emission of light when the PSP plate is stimulated by laser light. PSL - photostimulable luminescence
Invisible image stored on the PSP before processing. Latent Image
What type of detecor does DR use Flat Panel
Elements (the 3 Cs) Capture, Coupling, Collection
Measure of system’s ability to transfer detail from object to image. MTF - modulator transfer function
Efficiency of detector in converting x-rays to image DQE - Detective Quantum Efficiency (Higher DQE = lower dose)
Signal strength vs background noise. Signal to Noise ratio
Ability to distinguish small differences in gray. Contrast Resolution
Range of exposures detector can capture. Dynamic Range
Ability to see small details (measured in lp/mm). Spatial Resolution
Created by: jetsetjes
 

 



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