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
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
