Week One Equipment Flashcards
What units does the cathode contain?
Filament and focusing cup
The coil of wire that emits electons when heated
Filament
This is a process where the high current boils off atoms and eject them from the filament
Thermionic Emission
The upset of electrical characteristics within the tube. Can lead to abrupt tube failure
Arcing
Cloud of charged filaments ejected during thermionic emission
space charge
Metal shroud housing for the filament
focusing cup
Two types of anodes
stationary and rotating
What part of the anode is located outside the glass envelope
Stator
What powers the rotation anodes?
electromagnetic induction motor
Why use tungsten as anode target?
Can withstand high speed rotation and repetitive expansion and contraction
Source of radiation in the xray tube
focal spot
Focal spot becomes a —— with a rotating anode
focal track
This is smaller than the actual focal spot because of anode angle
effective focal spot
Three main components of xray imaging system
Operating console (primary circuit), high-voltage generator (secondary circuit), xray tube
measures the voltage provided to the xray imaging system and adjusts the voltage to 220v
line compensator
Has a single winding and is designed to supply a precise voltage to the filament circuit and to high voltage circuit
autotransformer
regulates the length of exposure by the tech and timer
exposure switch
the most accurate of the xray exposure timer
electronic timers
radiation quality is xray — expressed in —.
quality, penetrability, kvp
the process of converting AC to DC
rectification
direction of current for AC
goes both ways
direction of current for DC
One direction always from cathode to anode
provides electrons for for the xray tube current by boiling them off the filament
Filament Circuit
Radiation quantity is xray — expressed in — .
intensity, mAs
