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CRDR Imaging 11 Exam Questions & Answers 2024/2025

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CRDR Imaging 11 Exam Questions & Answers 2024/2025 Digital Radiography (2) - ANSWERSIncludes both: 1. *Computed Radiography* (CR) 2. *Direct Radiography* (DR) CR - ANSWERSComputed Radiography (analog) DR - ANSWERSDirect Radiography Computed Radiography (CR) - ANSWERSCassette-based ...

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  • November 22, 2024
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  • 2024/2025
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CRDR Imaging 11 Exam Questions &
Answers 2024/2025

Digital Radiography (2) - ANSWERSIncludes both:

1. *Computed Radiography* (CR)

2. *Direct Radiography* (DR)



CR - ANSWERSComputed Radiography (analog)



DR - ANSWERSDirect Radiography



Computed Radiography (CR) - ANSWERSCassette-based *digital* radiography.



CR is a marketing term for? - ANSWERSphotostimulable phosphor (PSP) detector systems.



How does a PSP dectector system work? - ANSWERSAnalog signal (data) is created and interpreted by
computed and digital devices.



What role does phosphor play in PSP detector systems? - ANSWERSAs the exit beam strikes the
phosphors, some light is emitted but most energy is trapped in the PSP screen, which makes a latent
image.



phosphors - ANSWERSA synthetic fluorescent substance



Latent Image - ANSWERS-*After exposure, before the image*

-An image on an exposed film or print that has not yet been made visible by developing.



PSP screens are sometimes called? - ANSWERS1. storage phosphors

, 2. imaging plates.



CR Imaging Plates are made of - ANSWERS*Barium Fluorohalide Crystals*



ex. 85% BaFBr (barium flourobromide) and 15% BaFI (Barium Fluoroiodide)



Why is barium used? - ANSWERSIt helps imaging plate *absorb the exit beam* because it has a high
atomic number and does not allow the exit beam to pass through.



Why is europium used in CR plates? - ANSWERS-Europium creates defects in the barium fluorohalide
crystals.

-It act as a bucket to *trap electrons at a different energy level* until they're processed.



What element is responsible for activating CR imaging plates? - ANSWERSEuropium



Scanning the Imaging Plate Diagram - ANSWERS



- ANSWERS-Inside machine there is a Red lazer.

Lazer sends beam to a mirror.

-Mirrior goes around in a ciricel and reflects light down as its turning

-ITs caputing light beam and turns it so it moves across the panel

-keeps revolving and next oen comes and scans next line.

-scans one row at a time.

-gives off a burst of light

-gives off blue green light thats being captured in the guide.

-filter out red light- least penetrating- one thats gos away first- red light isnt part of imagein- its noice

-image is blue green light thats goes into the guide.

-blue green strikes photomupliter tube

-converts light to electrons

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