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Ct image production with 100% correct answers
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Ct image production with 100% correct answers
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Ct image productionAre X-ray tubes in ct similar to those used in diagnostic radiography? - correct answer ✔✔Yes
Compared to general radiography, Ct X-ray tubes require? - correct answer ✔✔A larger heat capacity
because ct requires longer exposure times, more radiation and higher ma settings.
Production of X-rays in a ct machine require? - correct answer ✔✔A source of elections, rapid
acceleration of electrons, rapid deceleration of electrons.
The flow of electrons through an X-ray tube? - correct answer ✔✔Cathode to anode(target)(positively
charged)
What interaction to the anode is responsible for x-ray production? - correct answer ✔✔Electron
interaction which kvp(voltage) is applied negatively(cathode) to the anode(positive)
The specific process that accelerates electrons in an X-ray tube? - correct answer ✔✔Application of
voltage(kvp)
Increasing ma in ct affects what? - correct answer ✔✔Increased patient dose, increases exposure to
detector elements, and increased the intensity of the beam
What increase of exposure factors would increase the total number of X-ray photons exposing the
detectors? - correct answer ✔✔Ma, kvp and rotation time.
Ma increased total number of photons beings produced
Kvp increase total number of photos production which increased penetrating ability of photons
Increase rotation time without changing ma results in a longer exposure and more total photons
exposing the detectors
, If ma is decreased by a factor of 2, how is the radiation dose to the patient changed? All factors remain
the same. - correct answer ✔✔Dose is decreased by a factor of 2 because the relation between ma and
dose is directly proportional and linear
What technical change Is expected to increase the penetrating ability of an xray beam? - correct answer
✔✔Increased kvp
Increasing ma and rotation time increased number of photons but not the energy of those photons
which kvp does
If the rotation time of a scan is decreased, what other exposure parameter should be changed to
maintain the image quality? - correct answer ✔✔Increase the ma
If ma increased then rotation time decreases
If ma decreased then rotation time increases
A single view acquired during a ct scan is called a? - correct answer ✔✔Projection
The main difference between image production in ct compared to image production in radiography? -
correct answer ✔✔Projections are compiled into a 3D volume of data
Physical components located inside the ct gantry include?? - correct answer ✔✔X-ray tube and high-
voltage generator
Increasing the ma and kvp of a ct scan will usually result in? - correct answer ✔✔Increased patient dose
and increased image quality
(should use lowest dose possible)
A common kvp setting used in ct? - correct answer ✔✔120 kvp
Usually used 80,100,120 and 140 kvp
The signal produced by a detector is an? - correct answer ✔✔Analog electrical signal
An 8-slice scanner has?? - correct answer ✔✔8 detector rows
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