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CT REGISTRY REVIEW EXAM GUIDE QUESTIONS WITH CORRECT ANSWERS 2024
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CT REGISTRY REVIEW EXAM GUIDE
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CT REGISTRY REVIEW EXAM GUIDEd) digital subtraction angiography – answer CT is commonly referred to as all of the
following names except: A)computed tomography B)computerized axial tomography C)
CAT-scan D)digital subtraction angiography
c) the energy level & quantity of x-rays can be selected - answer What control does the
operator have over the x-rays in a CT exam: A)the temp & color of the x-rays can be
tuned B)the phase & frequency of the x-rays can be adjusted C)the energy level & the
quantity of x-rays can be selected D)the volume & tone of the x-rays can be dialed
c) both a & b are correct - answer Which of the following statements is true: A)kV is the
voltage potential between the tube cathode and anode while mA controls the filament
current & thus ultimately the temperature of the cathode filament B)kV controls the
energy level of the x-ray photons & emitted from the tube C)both a & b are correct
D)none of these
c) the type of detector material used - answerWhich of the following does not affect the
quantity of x-rays that completely penetrates the patients: A)the distance that the x-rays
must travel on their course through the patient's body B) the molecular composition of
the tissues through which the x-ray photons pass C) the type of detector material used
D) both a & b
C) in a system with a low voltage slip ring, the high voltage generator is stationary
during a scan - answerWhich of the following statements is false: A) the CT x-ray tube
emits x-ray at the same time x-rays are measured by the detectors B) the CT tube
rotates around the patient while projection data is acquired C) in a system with a low
voltage slip ring, the high voltage generator is stationary during a scan D) none of these
D) long scan times are more desirable because they average out motion - answerWhich
of the following is false regarding the collection of CT data: A) the detectors measure
only those x-rays which completely penetrate the patient B) to collect the complete set
of CT data x-rays must be passed through the body at many diffrerent angles C) the
reconstruction process used to create the image occurs in the array processor D) long
scan times are more desirable because they average out motion
C) array processor - answerWhich of the following component is not normally located in
the gantry of a modern CT system: A) solid-state detector B) x-ray tube C) array
processor D)pre-patient collimators
C)they penetrate the body according to specific attenuation characteristics of each
tissue - answerWhy are x-ray used in CT: A) they are easily produced by the high
, frequency generator B)they are less harmful then the heating effects of microwave
radiation C)they penetrate the body according to specific attenuation characteristics of
each tissue D) the FDA imposes no limit on the dose to the patient
B) the electrons loses kinetic energy which is converted into the emission of an x-ray
photon - answerX-rays are produce whenever fast moving electron collide with any form
of matter because: A) the electron splits into two x-ray photons of equal energy upon
impact with matter B) the electrons loses kinetic energy which is converted into the
emission of an x-ray photon C) the electron converts the electron it coilildes with into an
x-ray photon D) all of these
B) collision between an incoming electron and an electron in an inner shell of the target
atom - answerBremsstrahlung radiation does not include which type of electron activity:
A) collision between an incoming electron and the nucleus of the target atom B) collision
between an incoming electron and an electron in an inner shell of the target atom C)
slowing down of an incoming electron due to the effect of passing close to the positive
charge of the nucleus of the target atom D) all of these
A) it has an high atomic number an a high melting point - answerWhich of the following
is the reason why tungsten is used as the target material on the tube anode: A) it has an
high atomic number an a high melting point B) it has an low atomic number and a high
melting point C) it has an high atomic number and an a low melting point D) it has an
low atomic number and a low melting point
C) many more x-rays are produce from general radiation than those from characteristic
radiation - answerWhat are the many reason that the majority of x-rays used in CT are
derived from general radiation and not from characteristic radiation: A) characteristic
radiation introduces artifacts in the images B) general radiation is more controllable with
kV and mA C) many more x-rays are produce from general radiation than those from
characteristic radiation D)general radiation is bremsstrahlung which constitutes a
cleaner form of x-ray
B) the collision of the electron beam with the tungsten target on the tube anode -
answerThe enormous heat that builds up in the CT tube is caused by: A) the electron
beam between the cathode and the anode in the tube B) the collision of the electron
beam with the tungsten target on the tube anode C)the intensity of the x-ray emitted
from the tube D) the x-ray filter in the tube which absorbs the lower energy photons
before they can enter the patient
C) the mA - answerThe number of electrons that flow from the cathode to the anode in
the tube is controlled by: A) the kV B)the anode target C) the mA D) none of these
D) allof these - answerThe continuous slip ring: A)prevents the high voltage from
winding up B) allows the exam to commence more rapidly C) prevents the reversal of
rotation of the gantry frame D) all of these
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