LMRT STATE REVIEW QUESTIONS WITH CORRECT DETAILED ANSWERS
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Course
LMRT
Institution
LMRT
LMRT STATE REVIEW QUESTIONS WITH CORRECT DETAILED ANSWERS
focusing cup - Answer-small oval depression in the cathode assembly, the negative charge of the focusing cup helps direct electrons toward the anode in a straighter less divergent path.
bremsstrahlung - Answer-X-rays that are produced...
LMRT STATE REVIEW QUESTIONS
WITH CORRECT DETAILED
ANSWERS
focusing cup - Answer-small oval depression in the cathode assembly, the negative
charge of the focusing cup helps direct electrons toward the anode in a straighter less
divergent path.
bremsstrahlung - Answer-X-rays that are produced when a projectile electron is slowed
by the electric field of a target atom nucleus
15% rule - Answer-used to maintain exposure to the image receptor and maintain
radiographic film density. Increasing kvp 15% requires mas to decrease by 50%,
decreasing kvp requires mas to increase x2.
inverse square law - Answer-Intensity of the x-ray beam is inversely proportional to the
square of the distance between the source of x-rays and the image receptor.
characteristic radiation - Answer-Produced when a high-speed electron dislodges an
inner-shell electron from a tungsten atom and causes ionization of that atom. Occurs
only at 70 kVp and above.
focal track - Answer-The tungsten focal area all around the beveled edge of the rotating
anode
actual focal spot - Answer-An area on the target surface that is struck by the electron
stream
effective focal spot - Answer-The area of the focal spot that is projected out of the tube
toward the object being radiographed is the:
target angle - Answer-The slant of the anode surface; between 7 and 17 degrees, with
12 degrees the most common; it affects the tube's heat capacity, the sharpness of the
radiographic image, and the maximum size of the x-ray beam.
potential difference - Answer-In order to get electrons to flow, this is required.
frequency - Answer-How many waves can pass a given point per second, measured in
Hertz (Hz)
circuit - Answer-...
, electromagnetic conduction - Answer-when the direction of current flow is
reversed,creating alternating current
primary radiation - Answer-X-ray beam that leaves the tube and is attenuated, except by
air. It's direction and location are predictable and controllable.
tube port - Answer-X-rays exit the tube housing through an opening called the
velocity - Answer-wavelength times frequency
atomic number - Answer-A unique number identifying the number of protons in the
nucleus of an atom. This number identifyies the atom.
atom - Answer-Basic unit of matter; made of three sub-atomic particles (neutrons,
protons, and electrons)
matter - Answer-Anything that has mass and takes up space
molecule - Answer-A particle made of two or more atoms bonded together.
crest - Answer-Highest point of a wave
amplitude - Answer-...
coolidge tube - Answer-hot cathode x-ray tube; vacuum tube that allowed x-ray intensity
and energy to be selected separately and with great accuracy
crooks tube - Answer-What type of tube was used when x-rays were first discovered?
electric energy - Answer-Energy of electric charges.
thermal energy - Answer-Energy from heat
potential energy - Answer-"stored energy"
kinetic energy - Answer-Energy of motion
direct current - Answer-Current that flows through a conductor in one direction only.
alternating current - Answer-Current that flows through a conductor in two directions
that are periodically altered.
resistor - Answer-A material or device of a circuit that henders or opposes the flow of
electricity
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