This CT Registry Review quiz, dated May 13, 2010, tests knowledge on the technical aspects of CT imaging, including the function of components like the CT tube and the use of tungsten in its anode. It is designed for professionals preparing for certification and focuses on enhancing understanding of CT scanner operations.
Computerized axial tomography
Digital subtraction angiography
CAT-scan
Computed tomography
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Detector
Photodiode
Analog-to-digital converter
Host computer
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Reconstruction of the image from the raw data
Long term data storage
Digital distribution of images
Image display for the radiologists
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The temperature and color of the x-rays can be tuned
The energy level and the quantity of x-rays can be selected
The volume and tone of the x-rays can be dialed
The phase and frequency of the x-rays can be adjusted
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Miscalibrated detector
X-rays generated spontaneously in the ambient atmosphere
Deflections from the original trajectory of an x-ray photon through the patient
Improper patient positioning
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1 only
2 only
3 only
1,2 and 3
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1 only
2 only
3 only
1,2,&3
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Quantity of x-ray photons
Coefficient of attenuation
Slice thickness
Energy level of the x-ray photons
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Provide additional collimation in order to reduce scatter
Limit the x-ray dose to the patient
Capture x-ray photons and convert them to a measurable signal
Amplify the measured signal
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First-generation CT
PET/CT
Electron beam CT
MDCT
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The time between the end of one scan and the start of the next scan during which the tube will cool
A quality assurance text performed daily by the technologist
The time required for the tube to make a complete 360 revolution about the gantry
The length of time required for the production of photons to begin after applying the voltage to the tube
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Low, high
High, low
Low, low
High, high
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Tungsten target
Collimator
Rotating anode
Filament
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1 only
2 only
3 only
1, 2, & 3
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They are easily produced by the high frequency generator
They are less harmful than the heating effects of microwave radiation
They penetrate the body according to specific attenuation characteristics of each tissue
The FDA imposes no limit on the dose of the patient
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1 only
2 only
3 only
1, 2, and 3
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Bright artifact on a film
Single 3D volume elemnet within a volume of anatomical data
Single 2D picture element within the image plane
Range of gray levels on a CT image
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Anode target
Collimation
MA
KV
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Intensity of the x-rays emitted from the tube
Electron beam between the cathode and the anode in the tube
X-ray filter in the tube which absorbs the lower energy photons
Collision of the electron beam with the tungsten target on the tube anode
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Pre-patient collimators
Solid-state detectors
Array processor
X-ray tube
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Array processor
Operator's console
Host computer
Amplifier
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Line
Projection
View
Ray
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1only
2 only
3 only
1,2, and 3
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Iodinated contrast media
Vessels of interest
Air
Bones
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1 only
2 only
3 only
1, 2, & 3
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Multi-row detector scanners
The introduction of second-generation technology
The introduction of fourth-generation technology
Continuous rotation scanners
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1 only
2 only
3 only
1, 2, and 3
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1 only
2 only
3 only
1, 2, & 3
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1 only
2 only
1 & 2
2 & 3
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Second-generation
Third-generation
Fourth-generation
First-generation
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1 only
2 only
3 only
1, 2, & 3
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1 only
2 only
3 only
1, 2, and 3
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1 only
1 & 2
2 & 3
1, 2, & 3
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Weighted averaging
Filtered back projection
The fourier transform
Integration of the area under the curve
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1 only
2 only
3 only
1, 2, and 3
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Is accomplished by electrically blocking x-rays
Affects the scan time
Limits the low energy x-ray photons and passes the high energy photons
Is accomplished by physically blocking x-rays
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1 only
2 only
3 only
1, 2, and 3
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Minimal anatomical misregistration sometimes caused by inconsistent breath-holding
Shorter total exam time
Can retrospectively reconstruct a slice at any arbitrary position
Offers the best image quality for a brain exam
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1 only
2 only
3 only
1, 2, & 3
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They both produce digital images
The patient table moves at a constant velocity
They both produce cross-sectional images
The x-ray tube makes complete 360 degree rotations
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A reconstructed image is the sagittal plane
CT raw data
More photons
CT image data
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Second-generation
Third-generation
Multi-row detector
Continuous rotation
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1 only
1 & 2
2 & 3
1, 2, and 3
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1 only
2 only
3 only
1,2 and 3
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Component in the x-ray tube
Post-processing filter applied to image data
Type of detector
Filter applied to the CT raw data
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1 only
2 only
3 only
1, 2, & 3
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1 only
2 only
2&3
3 only
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Helps determine the size of the focal spot
Lights up the tube so it can be seviced by an engineer
Releases the x-ray photons
Focuses x-rays onto the anode target
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