CT REGISTRY UPDATED EXAM TEST PAPER QUESTIONS
AND ANSWERS SURE A+
✔✔A CT gantry includes all of the following components except:
a. collimators.
b. detectors.
c. central processing unit.
d. bow tie filters. - ✔✔central processing unit
✔✔Increased kVp means - ✔✔increased penetration of material
✔✔CT operator - ✔✔controls by selecting the energy level and the quantity of xrays
✔✔xray photon - ✔✔discrete bundle of energy
✔✔xray photon flux - ✔✔equals the rate at which xray photons pass through a given
unit of tissue over a given unit of time
✔✔xray photon - ✔✔the photon can pass through the detector unmeasured and the
measured signal is enhanced by an amplifier
✔✔Scatter radiation - ✔✔Radiation that is deflected from its original trajectory of an
photon through the patient.
✔✔DICOM - ✔✔Digital imaging and communications in medicine, a standard protocol
used for blending a picture archiving and communications system and various imaging
modalities, viewing stations, and printers
✔✔Heat builds up in the ct tube - ✔✔caused by collision of the electron beam with the
tungsten target on the tube anode
✔✔Helical Imaging - ✔✔_________ is well suited for 3D rendering because there is
minimal misregistration or gaps.
✔✔Continuous rotating CT systems, which were introduced in ____ by ____ and _____
medical systems were based on new "slip ring technology". - ✔✔
✔✔Continuous rotation of the CT x-ray tube and detector array, with simultaneous
movement of the CT couch, has been accomplished through implementation of
A. additional cables.
B. slip rings.
C. multiple rows of detectors.
D. electron beam CT. - ✔✔slip rings
, ✔✔In helical imaging, the path of the x-ray beam is determined by the thickness of the
_______ ________ and the speed of the _________ _______. - ✔✔
✔✔The patient table:
a. may move continuously during the scan
b. can never be positioned automatically by software due to safety precautions
c. remains stationary throughout the patient exam once
it is initially positioned
d. only moves after each slice is completed - ✔✔may move continuously during the
scan
✔✔continuous rotation scanners - ✔✔made helical imaging possible
✔✔The CT detectors cannot differentiate and adjust for differences in attenuation that
are caused by what type of energy x-ray photons which ultimately produces image
artifacts - ✔✔
✔✔CT detector - ✔✔main purpose is to capture xray photons and convert them to a
measurable signal
✔✔The cathode filament:
a. helps determine the size of the focal spot
b. lights up the tube so it can be serviced by an engineer
c. releases the x-ray photons
d. focuses x-ray onto the anode target - ✔✔size of the focal spot
✔✔kVp - ✔✔voltage potential between tube cathode and anode, while MA ultimately
controls the filament current nd thus, the temperature of the cathode filament
✔✔kVp - ✔✔controls the energy level of the xray photons and mA controls the number
of xray photons emitted from the tube
✔✔mA - ✔✔number of electrons that flow from the cathode to the anode in the rube is
controlled by mA.
✔✔solid state detectors - ✔✔xray photons cause detectors to generate a flash of light.
they are the detector used in most scanners today
can be used in 3rd or 4th gen scanners
✔✔Slip ring technology - ✔✔slip riLocated inside the CT gantry; allows the tube to
continue to rotate without the need to rewind
AND ANSWERS SURE A+
✔✔A CT gantry includes all of the following components except:
a. collimators.
b. detectors.
c. central processing unit.
d. bow tie filters. - ✔✔central processing unit
✔✔Increased kVp means - ✔✔increased penetration of material
✔✔CT operator - ✔✔controls by selecting the energy level and the quantity of xrays
✔✔xray photon - ✔✔discrete bundle of energy
✔✔xray photon flux - ✔✔equals the rate at which xray photons pass through a given
unit of tissue over a given unit of time
✔✔xray photon - ✔✔the photon can pass through the detector unmeasured and the
measured signal is enhanced by an amplifier
✔✔Scatter radiation - ✔✔Radiation that is deflected from its original trajectory of an
photon through the patient.
✔✔DICOM - ✔✔Digital imaging and communications in medicine, a standard protocol
used for blending a picture archiving and communications system and various imaging
modalities, viewing stations, and printers
✔✔Heat builds up in the ct tube - ✔✔caused by collision of the electron beam with the
tungsten target on the tube anode
✔✔Helical Imaging - ✔✔_________ is well suited for 3D rendering because there is
minimal misregistration or gaps.
✔✔Continuous rotating CT systems, which were introduced in ____ by ____ and _____
medical systems were based on new "slip ring technology". - ✔✔
✔✔Continuous rotation of the CT x-ray tube and detector array, with simultaneous
movement of the CT couch, has been accomplished through implementation of
A. additional cables.
B. slip rings.
C. multiple rows of detectors.
D. electron beam CT. - ✔✔slip rings
, ✔✔In helical imaging, the path of the x-ray beam is determined by the thickness of the
_______ ________ and the speed of the _________ _______. - ✔✔
✔✔The patient table:
a. may move continuously during the scan
b. can never be positioned automatically by software due to safety precautions
c. remains stationary throughout the patient exam once
it is initially positioned
d. only moves after each slice is completed - ✔✔may move continuously during the
scan
✔✔continuous rotation scanners - ✔✔made helical imaging possible
✔✔The CT detectors cannot differentiate and adjust for differences in attenuation that
are caused by what type of energy x-ray photons which ultimately produces image
artifacts - ✔✔
✔✔CT detector - ✔✔main purpose is to capture xray photons and convert them to a
measurable signal
✔✔The cathode filament:
a. helps determine the size of the focal spot
b. lights up the tube so it can be serviced by an engineer
c. releases the x-ray photons
d. focuses x-ray onto the anode target - ✔✔size of the focal spot
✔✔kVp - ✔✔voltage potential between tube cathode and anode, while MA ultimately
controls the filament current nd thus, the temperature of the cathode filament
✔✔kVp - ✔✔controls the energy level of the xray photons and mA controls the number
of xray photons emitted from the tube
✔✔mA - ✔✔number of electrons that flow from the cathode to the anode in the rube is
controlled by mA.
✔✔solid state detectors - ✔✔xray photons cause detectors to generate a flash of light.
they are the detector used in most scanners today
can be used in 3rd or 4th gen scanners
✔✔Slip ring technology - ✔✔slip riLocated inside the CT gantry; allows the tube to
continue to rotate without the need to rewind
