Which component of a CT scanner converts x-ray photons into electrical signals?
System Operations And Instrumentation
Question · Easy
What is the primary advantage of slip-ring technology in CT scanning?
CT System Hardware & X-Ray Generation
X-Ray Tube Design and Focal Spots
Study guide
In CT scanning, pitch is defined as:
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Increasing the tube current (mA) in a CT scan will primarily:
Which factor directly determines the energy (penetrating ability) of the x-ray beam in CT?
A CT scanner with a rotation time of 0.5 seconds, a pitch of 1.5, and 64 × 0.625 mm detector configuration will move the table how far per rotation?
Question · Medium
Tube Heat Loading, Bearings and Cooling
In a third-generation CT scanner, the x-ray tube and detector array:
What is the primary purpose of the bowtie (beam-shaping) filter in CT?
Decreasing the rotation time on a CT scanner from 1.0 second to 0.5 seconds, while keeping all other parameters constant, will:
What type of detector material is most commonly used in modern multidetector CT scanners?
Beam Filtration and Collimation
Which tube parameter should be increased when scanning a very large patient to maintain adequate photon penetration?
The anode heat capacity of a CT x-ray tube is important because:
In dual-energy CT, two datasets are acquired at different kVp settings primarily to:
Question · Hard
The Hounsfield unit (HU) value for water is defined as:
Data Acquisition And Post Processing
Scanner Generations and Source/Detector Geometry
Adjusting the window width (WW) on a CT image primarily affects:
A maximum intensity projection (MIP) reconstruction is most useful for evaluating:
Multiplanar reformation (MPR) allows the technologist to:
A soft tissue (standard) reconstruction kernel compared to a bone (sharp) kernel produces images with:
Detector Technology & Data Acquisition Systems (DAS)
Which reconstruction technique allows the technologist to create thinner or different slice widths from the same helical scan data?
A CT image displayed with a window level (WL) of -600 HU and a window width (WW) of 1500 HU is optimized for viewing:
Iterative reconstruction algorithms in CT are primarily advantageous because they:
Volume rendering technique (VRT) in CT differs from surface rendering in that VRT:
Gantry Mechanics & Ancillary Systems
Gantry Architecture, Clearance and Centering
To produce the highest quality sagittal and coronal MPR images, the technologist should acquire axial images with:
In CT, the term 'partial volume averaging' refers to:
Beam hardening artifact in CT is caused by:
Image Quality And Qa
Ring artifacts on a CT image are most commonly caused by:
Slip Rings, Couch Motion and Load Safety
Which type of CT artifact is most effectively reduced by using metal artifact reduction (MAR) software?
Spatial resolution in CT is primarily measured in:
Contrast resolution in CT refers to the ability to:
During daily QA testing of a CT scanner, the technologist measures CT numbers on a water phantom. The acceptable tolerance for water HU values is typically:
Power Injector Hardware and Safety
Photon starvation artifact in CT is most likely to occur when scanning:
Which quality control test evaluates the uniformity of CT numbers across a homogeneous phantom?
Quantum noise in CT images is inversely proportional to:
Stair-step (staircase) artifacts on 3D and MPR CT images are most effectively reduced by:
DICOM, Worklists and Image Archiving
During QA testing, a CT phantom shows a consistent 15 HU difference between the center and periphery of a uniform water section. This finding most likely indicates:
Which artifact appears as alternating bright and dark streaks between two dense objects in a CT image?
Which artifact results from incomplete projection data when part of the patient extends beyond the scan field of view?
Before administering iodinated contrast media, the technologist should verify that the patient's estimated glomerular filtration rate (eGFR) is above which threshold to proceed without additional precautions?
Medications And Contrast Agents
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