CT Registry Review (MIC) questions with accurate detailed
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solutions
In order for an x-ray photon to be measured it must:
|| || || || || || || || || ||
1. enter the detector chamber
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2. be absorbed by the detector material
|| || || || || ||
3. be converted to a measurable event - ✔✔1,2,3
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Which system component converts the projection attenuation data into the proper digital
|| || || || || || || || || || || ||
form for the array processor? - ✔✔analog-to-digital converter
|| || || || || || ||
Which of the following is NOT a function of a PACS system?
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a. reconstruction of the image from the raw data
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b. long term data storage
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c. digital distribution of images
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d. image display for the radiologist - ✔✔reconstruction of the image from raw data
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Which of the following is not part of the CT tube?
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a. tungsten target
|| ||
b. collimator
|| ||
c. rotating anode
|| ||
d. filament - ✔✔collimator
|| || ||
Which of the following is FALSE regarding CT systems?
|| || || || || || || ||
1. they are limited to nonoblique transverse scanning
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,2. they cannot generate a straight coronal or sagittal image
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3. hey have no moving parts - ✔✔1,2,3
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Xrays are used in CT because:
|| || || || ||
a. they are easily produced by the high frequency generator
|| || || || || || || || || ||
b. they are less harmful than 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 - ✔✔C
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Most of the commands from the technologists are received by the: - ✔✔operators console
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Xrays are produced whenever fast moving electrons collide with any form of matter
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because: - ✔✔The electron loses kinetic energy which is converted into the emission of an
|| || || || || || || || || || || || || || ||
x-ray photon||
The mA determines the: - ✔✔quantity of x-ray photons
|| || || || || || || ||
Which of the following is a component NOT normally located in the gantry of a modern CT
|| || || || || || || || || || || || || || || || ||
system? - ✔✔array processor || || ||
Tube interscan delay time refers to: - ✔✔the time between the end of one scan and the start
|| || || || || || || || || || || || || || || || || ||
of the next scan during which the tube will cool
|| || || || || || || || ||
Increased _______ will increase the likelihood that a given x-ray will penetrate a material
|| || || || || || || || || || || || ||
1. kV
||
2. mA
||
3. exposure time - ✔✔1
|| || || ||
,Which of the following are NOT commonly used on today's commercially available CT
|| || || || || || || || || || || || ||
scanners?
1. xenon detectors
|| ||
2. fourth-generation technology
|| ||
3. continous rotation technology - ✔✔1,2
|| || || || ||
Which of the following statements is FALSE regarding occurrences after an x-ray photon
|| || || || || || || || || || || || ||
penetrates the detector aperture? || || || ||
1. the photon can pass through the detector unmeasured
|| || || || || || || || ||
2. the photon is converted completely into a electron
|| || || || || || || ||
3. the measured signal in enhanced by an amplifier - ✔✔2
|| || || || || || || || || ||
Scatter radiation is caused by: - ✔✔deflections from the original trajectory of an x-ray
|| || || || || || || || || || || || || ||
photon through the patient
|| || ||
What control does the operator have over the x-rays in a CT exam? - ✔✔the energy level
|| || || || || || || || || || || || || || || || ||
and the quantity of x-rays can be selected
|| || || || || || ||
Which of the following is the standard that's used to achieve compatibility for image
|| || || || || || || || || || || || || ||
transfer between various imaging modalities, viewing stations, and printers in a hospital? -
|| || || || || || || || || || || || ||
✔✔DICOM
The enormous heat that builds up in the CT tube is caused by what? - ✔✔Collision of the
|| || || || || || || || || || || || || || || || || ||
electron beam with the tungsten target on the tube anode
|| || || || || || || || ||
_________________ made helical imaging possible - ✔✔Continuous rotation scanners || || || || || || || ||
, 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 through the exam once it is initially positioned
|| || || || || || || || || ||
d. only moves after each slice is completed - ✔✔A
|| || || || || || || || ||
The main purpose of the detector is to: - ✔✔capture x-ray photons and convert them to a
|| || || || || || || || || || || || || || || || ||
measurable signal ||
The cathode filament: - ✔✔helps determine the size of the focal spot
|| || || || || || || || || || ||
Which of the statements in TRUE:
|| || || || ||
1. kV is the voltage potential between the tube cathode and anode while mA ultimately
|| || || || || || || || || || || || || || ||
controls the filament temp of the cathode filament
|| || || || || || ||
2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray
|| || || || || || || || || || || || || || || || ||
photons emitted from the tube || || || ||
3. although kV and the mA affect the operation of the CT x-ray tube, the two parameters
|| || || || || || || || || || || || || || || || ||
have no bearing on the image quality - ✔✔1,2
|| || || || || || || ||
The number of electrons that flow from the cathode to the anode is controlled by the: -
|| || || || || || || || || || || || || || || || ||
✔✔mA
Which of the following is TRUE regarding solid state detectors:
|| || || || || || || || ||
1. x-ray photons cause the detectors to generate a flash of light
|| || || || || || || || || || ||
2. they are the detector type used on most CT scanners
|| || || || || || || || || ||
3. they can be used in both third-generation and fourth-generation CT systems - ✔✔1,2,3
|| || || || || || || || || || || || ||
|| || || || || || || ||
solutions
In order for an x-ray photon to be measured it must:
|| || || || || || || || || ||
1. enter the detector chamber
|| || || ||
2. be absorbed by the detector material
|| || || || || ||
3. be converted to a measurable event - ✔✔1,2,3
|| || || || || || || ||
Which system component converts the projection attenuation data into the proper digital
|| || || || || || || || || || || ||
form for the array processor? - ✔✔analog-to-digital converter
|| || || || || || ||
Which of the following is NOT a function of a PACS system?
|| || || || || || || || || || ||
a. reconstruction of the image from the raw data
|| || || || || || || ||
b. long term data storage
|| || || ||
c. digital distribution of images
|| || || || ||
d. image display for the radiologist - ✔✔reconstruction of the image from raw data
|| || || || || || || || || || || || ||
Which of the following is not part of the CT tube?
|| || || || || || || || || ||
a. tungsten target
|| ||
b. collimator
|| ||
c. rotating anode
|| ||
d. filament - ✔✔collimator
|| || ||
Which of the following is FALSE regarding CT systems?
|| || || || || || || ||
1. they are limited to nonoblique transverse scanning
|| || || || || || ||
,2. they cannot generate a straight coronal or sagittal image
|| || || || || || || || ||
3. hey have no moving parts - ✔✔1,2,3
|| || || || || || ||
Xrays are used in CT because:
|| || || || ||
a. they are easily produced by the high frequency generator
|| || || || || || || || || ||
b. they are less harmful than 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 - ✔✔C
|| || || || || || || || || || || || ||
Most of the commands from the technologists are received by the: - ✔✔operators console
|| || || || || || || || || || || || ||
Xrays are produced whenever fast moving electrons collide with any form of matter
|| || || || || || || || || || || || ||
because: - ✔✔The electron loses kinetic energy which is converted into the emission of an
|| || || || || || || || || || || || || || ||
x-ray photon||
The mA determines the: - ✔✔quantity of x-ray photons
|| || || || || || || ||
Which of the following is a component NOT normally located in the gantry of a modern CT
|| || || || || || || || || || || || || || || || ||
system? - ✔✔array processor || || ||
Tube interscan delay time refers to: - ✔✔the time between the end of one scan and the start
|| || || || || || || || || || || || || || || || || ||
of the next scan during which the tube will cool
|| || || || || || || || ||
Increased _______ will increase the likelihood that a given x-ray will penetrate a material
|| || || || || || || || || || || || ||
1. kV
||
2. mA
||
3. exposure time - ✔✔1
|| || || ||
,Which of the following are NOT commonly used on today's commercially available CT
|| || || || || || || || || || || || ||
scanners?
1. xenon detectors
|| ||
2. fourth-generation technology
|| ||
3. continous rotation technology - ✔✔1,2
|| || || || ||
Which of the following statements is FALSE regarding occurrences after an x-ray photon
|| || || || || || || || || || || || ||
penetrates the detector aperture? || || || ||
1. the photon can pass through the detector unmeasured
|| || || || || || || || ||
2. the photon is converted completely into a electron
|| || || || || || || ||
3. the measured signal in enhanced by an amplifier - ✔✔2
|| || || || || || || || || ||
Scatter radiation is caused by: - ✔✔deflections from the original trajectory of an x-ray
|| || || || || || || || || || || || || ||
photon through the patient
|| || ||
What control does the operator have over the x-rays in a CT exam? - ✔✔the energy level
|| || || || || || || || || || || || || || || || ||
and the quantity of x-rays can be selected
|| || || || || || ||
Which of the following is the standard that's used to achieve compatibility for image
|| || || || || || || || || || || || || ||
transfer between various imaging modalities, viewing stations, and printers in a hospital? -
|| || || || || || || || || || || || ||
✔✔DICOM
The enormous heat that builds up in the CT tube is caused by what? - ✔✔Collision of the
|| || || || || || || || || || || || || || || || || ||
electron beam with the tungsten target on the tube anode
|| || || || || || || || ||
_________________ made helical imaging possible - ✔✔Continuous rotation scanners || || || || || || || ||
, 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 through the exam once it is initially positioned
|| || || || || || || || || ||
d. only moves after each slice is completed - ✔✔A
|| || || || || || || || ||
The main purpose of the detector is to: - ✔✔capture x-ray photons and convert them to a
|| || || || || || || || || || || || || || || || ||
measurable signal ||
The cathode filament: - ✔✔helps determine the size of the focal spot
|| || || || || || || || || || ||
Which of the statements in TRUE:
|| || || || ||
1. kV is the voltage potential between the tube cathode and anode while mA ultimately
|| || || || || || || || || || || || || || ||
controls the filament temp of the cathode filament
|| || || || || || ||
2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray
|| || || || || || || || || || || || || || || || ||
photons emitted from the tube || || || ||
3. although kV and the mA affect the operation of the CT x-ray tube, the two parameters
|| || || || || || || || || || || || || || || || ||
have no bearing on the image quality - ✔✔1,2
|| || || || || || || ||
The number of electrons that flow from the cathode to the anode is controlled by the: -
|| || || || || || || || || || || || || || || || ||
✔✔mA
Which of the following is TRUE regarding solid state detectors:
|| || || || || || || || ||
1. x-ray photons cause the detectors to generate a flash of light
|| || || || || || || || || || ||
2. they are the detector type used on most CT scanners
|| || || || || || || || || ||
3. they can be used in both third-generation and fourth-generation CT systems - ✔✔1,2,3
|| || || || || || || || || || || || ||
