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DR & PACS ch4

Digital Radiographt & Pacs- Carter & Veale Chapter 4

What are the parts of the Digital Imaging cassette? The imaging plate and the reader.
What are the different layers in the IP? Protective layer, phosphor layer, reflective layer, conductive layer, color layer, support layer, backing layer.
What is photostimulation and what is its purpose in the IP? Traps the electrons during exposure.
How is the IP read? It is inserted into a reader that removes the imaging plate and scans it with a laser to release the stored electrons.
What is the phosphor layer? A layer of photostimulable phosphor that traps electrons during exposure.
What is the protective layer? A very thin, touch, clear plastic that protects the phosphor layer.
What is the reflective layer? This layer sends a light in a forward direction when it is released in the cassette reader.
What is the conductive layer? A layer of material that absorbs and reduces static electricity.
What is the color layer? Absorbs the stimulating light but reflects emitted light.
What is the support layer? A semi-rigid material that gives the imaging sheet some strength.
What is the backing layer? A soft polymer that protects the back of the cassette.
How is the imaging plate erased? By returning most of the electrons to a lower energy state, removing the image from the plate.
What are barcodes used on imaging plates? Links the imaging plate to the patient information and is used to identify the IP/cassette.
What do Barium fluorohalide crystals do? Release light energy in the IP, which is then stored in the conductive layer.
What does a photomultiplier do? amplifies the light and sends it to a signal digitizer.
What does the digitizer do? assigns a numerical value to each pixel in a matrix according to the brightness of the light and its position.
How is spatial resolution determined? The thickness of the phosphor layer and the number of pixels.
Created by: jenny.dvorak