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equipment-DENH

QuestionAnswer
what is voltage? force that drives electric current through circuit; affects contrast
what is the basic unit of voltage? volt = kilovolt
what occurs if KVP(voltage) is increased? voltage increase = increase speed = decrease size/wavelength = increase penetration
what is ampere? amount of electrical current flowing through circuit
what is ampere determined by? film speed, exposure time, and PID
what and how is ampere controlled? controls quantity and is controlled by MA
What do transformers do? increase (step-up) or decrease (step down) alternating current and voltage
what is the difference between low and high voltage circuits? low (step down) heats tube filament to incandescence and high (step up) activates electrons at heated filament toward anode(target)
what is electromagnetic radiation? wire moved through magnetic field, electrons in wire induced to flow
are the wavelengths of x-rays mono or polychromatic? polychromatic = waves of more than one frequency and wavelength
what is intensity of x-ray affected by? KVP, MA, exposure time and FFD
what happens if MA and KVP are increased? increases intensity
increase in exposure time? increases intensity
increase FFD? decreases intensity (due to divergent beam)
what occurs as move AWAY from central ray? divergency of x-rays increases
what is the inverse square law? intensity is less at increasing distances from source; as distance doubles, intensity quadruples = distance increase, intensity decrease
what is electricity? flow of electrons produced by electrical differences
what is the difference between direct and alternating current? direct-flows in one direction; alternating-flows in both directions
what does KVP refer to? kilovolt peak
what are factors determine KVP? object density or type of contrast desired
THE "24" ON THE TIMER DIAL STANDS FOR? 24 IMPULSES/SEC
SCATTER RADIATION FROM PID IS PREVENTED BY? LEAD LINING
THE COMPONENT THAT AUTOMATICALY ADJUSTS FLUCTUATION IN VOLTAGE IS CALLED? AUTOTRANSFORMER
X-RAYS OF ____ WAVELENGTH ARE MOST LIKELY TO RESULT IN SECONDARY RADIATION? LONG
Created by: 564399687