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RADT 151- review for unit 1.
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- RADIOBIOLOGY RADT 155 EXAM 1 REVIEW
RADT 151- review for unit 1.
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RADT 151- review for unit 1What are the three principle parts of the x-ray imaging system? - ANS-x-ray tube,
control console, and high voltage generator
What is the primary purpose of the the glass envelope of an x-ray tube? - ANS-to
provide a vacuum
What is the protective housing of an x-ray tube designed to do? - ANS-reduce the
hazard of leakage radiation
What is a diagnostic x-ray tube an example of? - ANS-diode
The large filament is used during radiography when the heat load is... - ANS-high; and
visibility and detail is less important
What is provided in most x-ray tubes that have two filaments? - ANS-two focal spots
What is the focusing cup usually made of? - ANS-molybdenum
What is the cathode beam of an x-ray tube? - ANS-focused electron beam within the
tube
What is the x-ray tube current controlled by? - ANS-the filament current
What type of x-ray tube is used the most? - ANS-dual focus tubes
What is the cathode part of? - ANS-the diode
What happens when a filament burns out? - ANS-the current goes to zero
Where does the space charge effect occur? - ANS-in the vicinity of the cathode
How much does the x-ray tube filaments conduct? - ANS-5A
What does a stationary anode x-ray tubes incorporate? - ANS-the line focus principle
Why does the heel effect occur? - ANS-x-ray absorption in the anode
, What is the main reason for using the line focus principle? - ANS-reduces focal spot
size
Why is x-ray intensity higher on the cathode side than on the anode side? - ANS-x-ray
absorption in the anode
What does small target angles result in? - ANS-small focal spot
a rotating anode target angle has atleast a degree of? - ANS-10-15 degrees
why is molybdenum used for anode stem material? - ANS-it is a poor thermal conductor
why is Tungsten the choice of material for x-ray anodes? - ANS-because of its high
atomic number
the effective focal spot is smaller or larger than the actual focal spot? - ANS-smaller
what is required of the heel effect for thicker body parts? - ANS-the cathode must be
positioned to the thicker parts
which part is the electromagnetic induction motor in the anode - ANS-stator
what must a necessary property of x-ray target material include - ANS-high melting
point
what is the advantage of the rotating anode tube vs. the stationary? - ANS-higher heat
capacity, disapate heat quickly, longer life of the target
why is the anode angle of an xray tube increased? - ANS-to give higher heat capacity
what component of a diagnostic x-ray tube is on the positive side of the tube? - ANS-the
stator, rotor, target
what happens to the effective focal spot size when the anode target angle increase? -
ANS-increases
when would a stationary anode be most likely used - ANS-in dentristry
Functions of the anode - ANS-conduction of electricity, mechanical support, thermal
conduction, and xray production
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