Font size
WorksheetsChapter 3 - Radiographic Image Production
Total questions: 20
Worksheet time: 10mins
What is the primary function of the photodetector in a CR reader?
Block scatter radiation during exposure
Emit coherent laser light for stimulation
Provide structural support for the cassette
Convert emitted light into an electrical signal
Bit depth in digital imaging determines which property of the image?
Field size defined by beam collimation
Noise level arising from photon starvation
Spatial resolution measured in line pairs
Number of gray levels available per pixel
Which term describes unwanted densities or distortions on an image not caused by anatomy?
Moiré pattern from grid interference
Shuttering that masks unused areas
Quantum noise from low photon counts
Artifacts that degrade diagnostic value
Which layer reduces static electricity buildup in a PSP imaging plate assembly?
Conductive layer that drains charge accumulation
Support layer that stiffens the phosphor panel
Color layer that absorbs stimulating light
Reflective layer that redirects emitted light
What is the purpose of the cassette in computed radiography?
Convert stimulated light into an electrical signal
Mask unused anatomy with postprocessing tools
Increase beam penetration with added filtration
Provide a lightproof housing for the PSP plate
Which description best defines grid ratio?
Number of lead strips per centimeter
Angle of lead strips to match divergence
Ratio of strip height to interspace width
Width of interspace material between strips
Focused grids are designed with what feature to match beam divergence?
Angled lead strips that converge appropriately
Randomized strips to reduce moiré artifacts
Parallel strips that remain perfectly vertical
Curved strips that follow cassette contours
Grid frequency refers to which measurement?
Height of grid strips to interspace width
Number of lead strips per unit length
Degree of grid focus for beam alignment
Thickness of the interspace material used
Which statement best describes collimation?
Balancing of gray levels by adjusting bit depth
Increase of photon flux by raising mAs
Enhancement of image edges during processing
Restriction of the X-ray beam to reduce scatter
Which pair correctly matches beam control with its effect?
mAs controls grid ratio and grid frequency
mAs controls photon quantity produced
kVp controls barcode linkage and exam matching
kVp controls laser scan speed and timing
kVp controls beam energy and penetration
Which component emits coherent light to release stored energy in a PSP plate during readout?
Photodetector converting light to signal
Laser providing the stimulating illumination
Reflective layer directing emitted light
Color layer absorbing the stimulating light
During readout, what is the function of the reflective layer in a PSP plate?
Store X-ray energy within the phosphor
Provide mechanical strength to the plate
Absorb stimulating light to reduce noise
Direct emitted light toward the reader
Which description best defines moiré in digital radiography?
Ghosting artifact from incomplete erasure
Grainy appearance from insufficient photons
Wavy artifact from grid frequency interference
Edge enhancement from excessive processing
What is the primary role of the protective layer on a PSP plate?
Shield the phosphor layer from physical damage
Increase the plate’s energy storage capacity
Block scatter radiation before exposure
Convert emitted light into an electrical signal
Fast scan direction refers to which movement during CR readout?
Grid alignment with the X-ray beam
Cassette insertion into the reader slot
Plate transport through the reader path
Laser movement across the imaging plate
What is the purpose of the color layer within a PSP plate?
Generate coherent light used for stimulation
Provide a lightproof seal around the cassette
Increase structural rigidity of the entire plate
Absorb stimulating light while reflecting emission
Which statement accurately defines quantum noise in digital imaging?
Random fluctuations caused by low photon quantity
Systematic pattern due to grid misalignment
Excess gray levels from high bit depth settings
Sharpness loss from slow laser scan speed
The phosphor center in a PSP crystal refers to what?
Region that reflects emitted light to the reader
Zone that dilutes scatter within the cassette
Point where the laser initially stimulates emission
Area where electrons are trapped during exposure
Which layer primarily protects the back of a PSP imaging plate from damage?
Backing layer made of a soft polymer
Conductive layer draining static charge
Support layer providing rigidity overall
Protective layer covering the phosphor
Which definition best describes the imaging plate in computed radiography?
PSP plate that stores energy from X-ray exposure
Lightproof container that houses the PSP plate
Laser that stimulates emission during readout
Detector that converts light into an electrical signal
