WorksheetsImaging process of CR
Total questions: 17
Worksheet time: 9mins
Which radiography type uses a photostimulable phosphor plate scanned to form a digital image?
Digital radiography with CCD
Digital radiography with flat‑panel
Computed radiography with phosphor plates
Conventional radiography using film cassettes
A department is transitioning from conventional radiography to computed radiography. Which change most directly affects the image receptor workflow?
Replacing screen-film cassette with reusable plate cassette.
Switching to reusable film-screen cassettes
switching to new X-ray machine along with flat panel receptor.
Using stronger X-ray tubes for exposure
Which statement best distinguishes Computed Radiography (CR) from Direct Digital Radiography (DR)?
DR uses cassette plates scanned post-exposure
CR uses a reusable phosphor plate read later
DR requires separate image pre-processing step
CR directly converts x-rays to a display image
In a computed radiography setup shown, which component serves as the image receptor that stores the latent X‑ray image before reading?
Barcode scanner beside the workstation
Monitor and workstation display
Cassette rack or holder unit
Photo‑stimulated phosphor imaging plate
A department is upgrading from screen‑film to computed radiography. Which change best describes equipment continuity during the transition?
Eliminates use of any cassettes entirely
Demands new patient positioning tools
Keeps the same X‑ray machine hardware
Requires replacing all X‑ray generators
Which layer of a CR imaging plate stores the latent image after X‑ray exposure?
Reflective backing layer
Support substrate layer
Photostimulable phosphor layer
Protective overcoat layer
A technologist needs to retrieve the latent image from an exposed CR plate. Which step should be performed next?
Place the plate in a dark room
Scan the plate with a laser reader
Expose the plate to more X-rays
Manually peel off the protective layer
An imaging plate is irradiated by X‑rays. Which sequence best explains latent image formation within the phosphor?
Laser excites binder, electrons discharge instantly
Photons reflect from base, then emit immediately
Electrons remain in valence band, no trapping
Electrons jump to conduction band, then get trapped
Which material composition best describes the photostimulable phosphor layer in a CR imaging plate?
Barium fluorohalide with europium activator
Pure barium sulfate without activator
Calcium tungstate with gadolinium dopant
Aluminum oxides with thallium activator
After X-ray exposure in a CR plate, what process forms the latent image?
Protons stored within the valence band
Eu2+ remaining unchanged in valence
Immediate visible light emission only
Liberated electrons trapped at F-centers
In a computed radiography system, what triggers the stored energy in the photostimulable phosphor of the imaging plate to emit light during readout?
Laser beam scanning across the plate
Electrical current applied to plate electrodes
Thermal heating of the imaging plate surface
High-intensity X-ray pulse from the tube
Which component in a CR reader primarily directs the laser beam back and forth across the imaging plate during fast scan mode?
Light channeling guide to the PMT
Rotating polygon or oscillating mirror
Optical filter increasing the SNR
Analog-to-digital converter output
Which component converts collected visible light from the imaging plate into an electronic signal during CR read out?
Analog-to-digital converter digitizing
Photomultiplier tube converting light
Fiber optic light guide bundle
Rotating polygon mirror scanning laser
In computed radiography, what is the primary purpose of the optical filter during readout of the imaging plate?
Convert blue emission into longer wavelength light
Block blue emission reaching the laser source
Pass blue emission while blocking red stimulation
Amplify red stimulation into the photomultiplier tube
What is the primary function of the photomultiplier tube in a computed radiography system?
To store the latent image
To convert light into an electronic signal
To scan the imaging plate with a laser
To enhance the image quality during readout
Which process occurs immediately after the imaging plate is scanned by the laser in a CR system?
Storage of the image in the computer memory
Recharging of the phosphor layer
Conversion of light to digital signal
Erasure of residual latent image
In computed radiography, what is the role of the protective overcoat layer on the imaging plate?
To improve light emission during readout
To prevent physical damage to the plate
To facilitate the scanning process
To enhance the phosphor's sensitivity
