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WorksheetsData Acquisition
Total questions: 10
Worksheet time: 5mins
Which CT gantry component enables continuous rotation by transferring power and signals without cables winding?
Static bearing with gear teeth
Rotary transformer with optical link
Slip ring with conductive tracks
Brush assembly with fixed cables
Which anode target material is typically chosen in CT x‑ray tubes for its high atomic number and heat tolerance?
Aluminum alloy for lightweight structure
Copper for superior electrical conduction
Tungsten or tungsten‑rhenium composite
Lead for maximum radiation shielding
During CT data acquisition, what happens when more photons reach the detector elements?
Signal stays constant across all views
Signal oscillates independent of exposure
Signal decreases producing darker pixels
Signal increases producing higher counts
Which statement best describes the purpose of a bowtie filter in CT imaging?
Blocks peripheral rays to reduce scatter only
Increases tube output to compensate attenuation
Shapes beam intensity to patient contour
Uniformly hardens the beam across the FOV
Pre-patient collimation primarily controls which parameter during CT acquisition?
Slice thickness and beam width
Detector gain calibration
Reconstruction kernel selection
Gantry rotation time
Compared with xenon gas detectors, solid-state crystal detectors typically have what key advantage?
Improved performance without any casing window
Reduced need for crystal scintillation layers
Lower susceptibility to mechanical vibration
Higher absorption efficiency of incident photons
A technologist must image a larger scan field of view. What is the most appropriate adjustment to maintain dose uniformity at the periphery?
Increase gantry rotation speed
Switch to xenon gas detectors
Disable pre-patient collimation
Use a wider bowtie filter profile
Which statement best distinguishes scintillation detectors from photon-counting detectors in CT?
Scintillation converts X-rays to light then electricity
Photon counting requires septa to control emitted light
Scintillation measures each photon’s energy directly
Photon counting converts light to X-rays then electrons
In CT detector electronics, what component performs the analog-to-digital conversion required by the computer?
Amplifier in the detector array
High-voltage power supply module
Analog-to-digital converter circuit
Photodiode light sensor
Table incrementation in CT refers to moving the patient table by what type of amount?
A fixed distance per rotation
A variable speed over a minute
A full scan length automatically
A percentage of detector coverage
