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.
Second-generation
Third-generation
Multi-row detector
Continuous rotation
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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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Anode target
Collimation
MA
KV
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1 only
2 only
3 only
1,2,&3
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Tungsten target
Collimator
Rotating anode
Filament
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1 only
1 & 2
2 & 3
1, 2, & 3
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Detector
Photodiode
Analog-to-digital converter
Host computer
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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, & 3
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Computerized axial tomography
Digital subtraction angiography
CAT-scan
Computed tomography
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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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1 only
2 only
1 & 2
2 & 3
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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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Long scan times are more desirable because they average out motion artifacts
The reconstruction process used to create the image occurs in the array processor
To collect the complete set of CT data, x-rays mus be passed through the body at many different angles
The detectors measure x-rays which completely penetrate the patient
Pre-patient collimators
Solid-state detectors
Array processor
X-ray tube
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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, & 3
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1 only
2 only
3 only
1, 2, and 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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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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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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Second-generation
Third-generation
Fourth-generation
First-generation
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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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1 only
2 only
3 only
1, 2, and 3
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1 only
2 only
3 only
1, 2, and 3
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Array processor
Operator's console
Host computer
Amplifier
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1 only
2 only
3 only
1, 2, and 3
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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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2 only
3 only
1, 2, and 3
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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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1 only
2 only
3 only
1, 2 and 3
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May move continuously during the scan
Can never be positioned automatically by software due to safety precautions
Remains stationary throughout the patient exam once it is initially positioned
Only moves after each slice is completed
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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, and 3
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1 only
2 only
3 only
1, 2, and 3
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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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1 only
2 only
2&3
3 only
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1only
2 only
3 only
1,2, and 3
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Helical image data is well suited for 3D SSD because there is minimal misregistration or gaps
The volume data, from which the 3D SSD is generated, is created by combining transverse, sagittal, and coronal reconstructions
The tissure surface may be selected by using a threshold value equal to the tissue's CT number
Patient motion during the scan is detrimental to the quality of the 3D images
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1 only
2 only
3 only
1,2 and 3
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Iodinated contrast media
Vessels of interest
Air
Bones
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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 and 3
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Volume rendering
Multi-planar reconstruction
Maximum intensity projection
3D shaded surface display
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1 only
2 only
3 only
1, 2, & 3
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