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Radt 465

ARRT registry review covering equipment operations and quality control

QuestionAnswer
Brems means what? short for Bremsstrahlung , Brem is German for Braking
Which x-ray production comprises 70-90% of x-rays? Bremsstrahlung
High speed electron encounters a tungsten atoms within the anode and ejects a K shell electron leaving a vacancy in the shell then its filled and in doing so what is created? Characteristic radiation
All electromagnetic radiations have the same what? Velocity, speed of light 3x 10(8) m/s
refers to the distance between two consecutive wave crests? wavelengths
refers to the number of cycles per second? what unit is it measured in? Frequency, Hert Hz.
The gradual decrease in exposure rates as radiation passes through tissues is call what? attenuation
Photon interaction that is during relatively low-energy x rays that uses up all of it energy (total absorption) to eject and inner shell electron leaving a vacancy, then an outer shell fills that spot and doing so gives up the characteristic x ray. photoelectric effect
Photo interaction that is during fairly high energy x rays that the incoming high energy photon uses part of its energy to eject the outer shell electron in doing so the direction changes, contributes to image fog and poses radiation hazard to personnel Compton Scatter
Coherent scatter is also known as? classical, unmodified, rayleigh
This interaction between x rays and matter occurs with very low energy photons, rarely used in diagnostic Coherent scatter
_______ is used to increase the incoming voltage to the more useful kilo voltage required for an x ray x ray transformers
transformers require what type of operation? alternating current
autotransformers operate on what principal? self- induction
heating of the filament to incandescence and subsequent "boiling off" of electrons is called? thermionic emission
the anode is made of what? molybdenum or graphite with a focal track made of tungsten and rhenium alloy
Line Voltage compensator functions to automatically adjust for any fluctuations in incoming voltage supply.
greater number of pixels means what to spatial resolution? greater number of pixels=smaller pixels=better resolution
the x-ray circuit has three main portions? the primary or low voltage,, the filament circuit, secondary or high-voltage side
what do the timers do ? and what are the types? timers regulate the length of the exposure, types include: mechanical, impulse, synchronous, and mAs timer, electronic timer, and AEC
Created by: amcoker