RADT 1010 Final Exam Reviewed Questions With Solutions
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Course
RADT 1010
Institution
RADT 1010
RADT 1010 Final Exam Reviewed Questions With
Solutions
Production of xrays require four factors☑️Correct Ans-source of electrons, target, high-voltage,
vacuum
Explain thermionic emission☑️Correct Ans-occurs when filament heated at 2200 degrees,
causes electrons to be released from f...
RADT 1010 Final Exam Reviewed Questions With
Solutions
Production of xrays require four factors☑️Correct Ans-source of electrons, target, high-voltage,
vacuum
Explain thermionic emission☑️Correct Ans-occurs when filament heated at 2200 degrees,
causes electrons to be released from filament. when high voltage released at exposure, e- are
driven toward anode
what causes tube failure☑️Correct Ans-- tube arcing (vaporized tungsten collection on envelop)
- filament breakage (often due to boost and hold)
what is the focusing cup made of☑️Correct Ans-nickel or molybdenum
does a focusing cup have a high/low, negative/postivite potential☑️Correct Ans-low negative
what is the mA for space charge effect☑️Correct Ans-maximum mA is 1000-1200
three functions of anode assembly☑️Correct Ans-- target surface
- conducts high voltage
- serves as primary thermal conductor
,components of rotating anode assembly☑️Correct Ans-- anode
- stator
- rotor
Description of stator☑️Correct Ans-located outside envelope, is a bank of electromagnets
description of rotor☑️Correct Ans-- is a copper cylinder connected to an anode disk by a
molybdenum stem.
- It turns when the stator is energized.
- contains ball bearings.
at what speed does the rotor turn at☑️Correct Ans-- 3200-3600 rpm
- 10000-20000 rpm high speed anodes
what is the rotating anode made of and why☑️Correct Ans-tungsten-rhenium alloy, because it
has high atomic number, high melting point, has heat conducting ability
what temperature does the focal track get to☑️Correct Ans-reaches 1000-2000 degrees in
normal use
what is the anode backed with and why is it backed☑️Correct Ans-molybdenum and/or
graphite. backing assists with heat loading
what is target area and what areas☑️Correct Ans-portion of anode that electron stream contacts,
point source of xray photons
- target, focus, focal point, focal spot, focal track
is a large or small focal spot better for life of anode☑️Correct Ans-large focal spot is better for
life of anode
what size focal spot is required for image quality☑️Correct Ans-small focal spot
What is the line focus principle?☑️Correct Ans-by using a small anode angle you can change
the size of the effective focal spot (make it smaller for better resolution) without increasing the
heat and damaging the anode.
what is effective focal spot controlled by☑️Correct Ans-actual focal spot and target angle
what are the diagnostic ranges☑️Correct Ans-10-1200 mA
0.001 to 10 seconds
30-150 kVp
, description of xray table☑️Correct Ans-uniform, radiolucent surface, easy to clean, no crevices
that could collect contrast media, contains bucky/IR
what are the different tube supports☑️Correct Ans-- overhead
- floor
- floor to ceiling
- mobile
- c-arm
what are the uses of upright units☑️Correct Ans-chest, abdomen, AC joints, cervical spine
how is shock hazard minimized from the high-voltage cables☑️Correct Ans-1. insulation
2. grounded wire sheath
3. secondary side of high voltage transformer is grounded
what can be selected on operating console☑️Correct Ans-power on/off, kV, mA, time, exam
(hand, hip,etc.), AEC chambers, detector being used, focal spot size, view worklist
exposure switch description☑️Correct Ans-deadman switch, pressing halfway down starts rotor
and filament boost circuit, depress in one motion to maximize tube life
how long do moblie xray unit cord need to be☑️Correct Ans-mobile xray exposure switch
requires 3-meter cord
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