General X-ray Machine Operator Exam Guide exam with complete solutions
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Course
Basic X-Ray
Institution
Basic X-Ray
collimator definition
A box-like device attached under the tube housing that allows the limited operator to vary the size of the radiation field (a variable aperature)
detent
A mechanism that tends to stop a moving part in a specific location
computed radiography (CR)
Sometimes cal...
General X-ray Machine Operator Exam
Guide exam with complete solutions
collimator definition - ANSWER-A box-like device attached under the tube
housing that allows the limited operator to vary the size of the radiation field (a
variable aperature)
detent - ANSWER-A mechanism that tends to stop a moving part in a specific
location
computed radiography (CR) - ANSWER-Sometimes called "filmless systems"
which produce images via a digital format using computer technology,
eliminating the need for darkrooms
image receptor system (IR) - ANSWER-Consists of the X-ray film and the film
holder, also known as a cassette
central ray - ANSWER-A line in the center of the X-ray beam and perpendicular to
the long axis of the X-ray tube
attenuation - ANSWER-the absorption of x-ray beam by matter
,control booth - ANSWER-The portion of the X-ray room that is protected from
scatter radiation and safe during exposures
grid or bucky - ANSWER-A device to protect the film from being fogged by scatter
radiation
remnant (exit) radiation - ANSWER-the resulting beam that exits from the patient
and creates image
tube port - ANSWER-An opening in the X-ray tube where X-rays that are traveling
in a useful direction exit
scatter radiation - ANSWER-photons that interact with the body's matter and
travel in a different direction
primary radiation - ANSWER-The X-ray beam that leaves the tube and is
unattenuated, except by air
longitudinal - ANSWER-Tube motion along the long axis of the table
transverse - ANSWER-Tube motion across the table, at right angles to
longitudinal
vertical - ANSWER-Tube motion up and down, increasing or decreasing the
distance between the tube and the table
Angle (tilt, roll) - ANSWER-Permits angulation of the tube along the longitudinal
axis of the table
Rotation - ANSWER-Allows the entire tube stand to turn on its axis
X-Ray tube - ANSWER-the source of x-rays
phosphor material - ANSWER-Used in a closed cassette rather than on film to
obtain computed radiography (CR) images
, ceiling support system - ANSWER-most common, has 2 sets of rails that allow for
lateral and longitudinal movement, lock and raise and lower to obtain the correct
distances
floor to ceiling support system - ANSWER-Has a single column with rollers at
each end, one attached to the ceiling-mounted rail and the other attached to a
floor-mounted rail
What are the three parts of the external part of the x-ray tube? - ANSWER-support
structure, protective housing, and glass or metal enclosure
What are the internal parts of the x-ray tube? - ANSWER-cathode and anode
cathode - ANSWER-a negatively charged electrode that is the source of electrons
in an electrical device
anode - ANSWER-a positively charged electrode by which electrons leave an
electrical device. It conducts electricity and radiates heat and contains the target.
thermionic emission - ANSWER-is the giving off of electrons from the surface of a
hot metal
(tungsten filament)
glass or metal enclosure - ANSWER-Encloses the entire cathode and anode
assembly except the stator
focusing cup - ANSWER-a recessed area where the filament lies, directing the
electrons toward the anode
What are the primary parts of the cathode? - ANSWER-filament and focusing cup
filament - ANSWER-a very tightly wound wire, when heated up it allows electrons
to become free
anode target - ANSWER-area of the anode struck by the electrons from the
cathode
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