Photostimulable Phosphor (PSP) Screen Construction Flashcards
PSP has 6 different layers, what are they?
- Protective Layer
- Phosphor or Active Layer
- Support Layer
- Reflective Layer
- Lead Backscatter Control
- Backing Layer
Protective layer
Very thin, tough, clear plastic that protects the phosphor layer
Phosphor or active layer is a ___________ that _____ electrons.
- photostimulable phosphor
- “traps”
The Phosphor or Active layer is made of phosphors from the _____________ family. Contains _____________ to prevent light spread.
- Barium Fluorohalide
- light absorbing dye
Support layer
- semi-rigid material
- gives imaging sheet some strength
- supports phosphor layer
Reflective layer
sends light in a forward direction when released in the cassette reader.
Lead Backscatter Control
To absorb backscatter
Backing Layer
- Soft polymer
- Protects the back of the cassette
- Bar code is placed here
Digital images are a matrix of _____ (picture element) values
pixels
Exposure involves a numeric value representing the amount of exposure the ____ and ____ screen received
- IP
- PSP
Exposures value is dependent on _______ who set guidelines
manufacturer
Exposure is signified by the ____________.
Sensitivity number (S)
The S number is _____________ to radiation striking detector
inversely proportional
ex) 100 - 400 for exam
over 400–> underexposure
under 100—> overexposure
Other manufacturers may use ___________ rather than the S number.
exposure index (EI)
EI is ____________ to radiation striking the detector
directly proportional
ex) 2.0 to 2.4 for exam
lower than 2.0–> underexposure
higher than 2.4–> overexposure
