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What is PSP backed by? And what does it absorb?
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What is Felt Material
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LRA 221 CH 4

Photostimulable Phosphor Image Capture

QuestionAnswer
What is PSP backed by? And what does it absorb? a thin sheet of aluminum or lead that absorbs backscatter X-ray photons
What is Felt Material antistatic material ; designed to reduce or prevent the buildup of static electricity
What is an ACTIVE LAYER of an imaging plate? a layer of photostimulable phosphor that “traps” electrons during exposure
What is a COLOR LAYER of an imaging plate? between the active layer and the support layer, which absorbs the stimulating light but reflects emitted light.
What does a REFLECTIVE LAYER do? sends light in a forward direction when released in the cassette reader.
What is the purpose of the barcode layer? allows the technologist to match the image information with the patient-identifying barcode on the examination request
The PHOSPHOR LAYER is made up of what type of Phosphor? usually made of phosphors from the barium fluorohalide family
When the imaging plate is irradiated, stimulated electrons enter what layer? PHOSPHOR/ACTIVE LAYER
What happens during laser beam formation? a laser emits a strong and focused beam of light by exciting atoms or molecules in the device
What is COHERENT LIGHT? And which way do the photons travel? Light amplification by stimulated emission of radiation ; all of the photons are traveling in the same direction at the same frequency.
What does the OPTICAL MIRROR do? ensure that the beam is positioned consistently and directs the laser beam to the surface of the imaging plate
What is the typical cassette throughput? # of cassettes that can be processed within a certain time frame which is 50 per hour
What is digitization? process of converting analog info into a digital format that can be stored, manipulated, and transmitted using computers or electronic devices
What is the wavelength of a PSP resolution? 633 nanometers
What type of pattern does the laser scan an imaging plate? raster scanning pattern ehich is a zigzag motion
Define translation the movement of the imaging plate through the reader because it moves in a parallel manner at a certain rate
What determines PSP resolution? phosphor layer thickness and pixel size
How are PSP imaging plates erased? flooding it with light to remove any electrons still trapped after the initial plate reading
What is spatial resolution? The amount of detail present in any image
What is image misrepresentation? the act of altering or manipulating an image in a way that distorts or misrepresents the original content
What does kVp do? control penetration and tissue type
The k-edge of a phosphor imaging plate ranges from? 30-50 keV and 60-110kVp
What is the range of kVps that can be used in PSP systems? 45-120
What is mAs selected for? number of photons required for the body part to be imaged
What will happen to the image if insufficient light is produced by a PSP plate? the image will be grainy, quantum mottle
What is quantum mottle caused by? low #s of photons reaching the IR, insufficient light
What should be considered for selecting a PSP plate? type and size
What is the outcome of HIGH # of pixels in a matrix? The more pixels there are, the greater the image resolution for a fixed field of view
Why is it more critical to use a grid in PSP examinations than it is in film/screen radiography? PSP systems are more sensitive to scatter radiation
Define grid frequency? the number of grid lines per centimeter or inch
Define grid ratio? The relationship between the height of the lead strips and the space between the lead strips
Which grid requires more critical beam centering? focus grid
What is the benefit of collimating small? decrease patient dose
Shuttering is a post exposure image manipulation technique that is added to the screen image (T/F) true
Using personal markers adds credibility to a technologist expertise (T/F) true
What is exposure index (indicator) measure? the amount of radiation recieved by the image receptor
What causes cracks in the imaging plate? As the imaging plate ages, it becomes prone to cracks from the action of removing and replacing the imaging plate within the reader.
What type of artifacts are intermittent extraneous lines? plate reader
PSP phosphor speed and radiographic film speed are always equal? (T/F) False
Does a PSP plate require periodic erasure? PSP readers have an erasure mode that allows the surface of the imaging plate to be scanned without recoding the generated signal.
Is less kVp needed for conventional radiography or PSP systems? Sufficient kVp is needed to penetrate the body part; however, higher kVp values can be used, allowing for lower mAs values.
Grid lines interfere with an image?(T/F) True
It is acceptable to replace collimation with shuttering?(T/F) False
Images should be marked with only computerized markers?(T/F) False; conventional lead markers
Created by: nishaat
 

 



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