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RAD 350 Chapter 16 Digital Radiography

RAD 350 Chapter 16 Digital Radiography. Many types/names for the digital imaging processes and devices. Types. CR: Barium Fluorohalide PSP SPR (scan projection RAD): Nal scintillator /photodiode Indirect DR: Csl , GdOS scintillator Indirect DR: Csl /Charge couploed device (CCD)

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RAD 350 Chapter 16 Digital Radiography

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  1. RAD 350 Chapter 16 Digital Radiography • Many types/names for the digital imaging processes and devices

  2. Types • CR: Barium Fluorohalide PSP • SPR (scan projection RAD): Nalscintillator/photodiode • Indirect DR: Csl, GdOSscintillator • Indirect DR: Csl/Charge couploed device (CCD) • Direct DR: a-Se, Thin-film transistor (TFT)

  3. ES’s “Clever approach (capture element, coupling element, collection element • “Capture element” – how the x-rays are captured (PSP’s, Csl, gado, etc) • “Coupling element” transferring the x-ray “signal” to the collection element • “Collection element: - devices to either collect light photons or electrons

  4. Scan Projection Radiography • As in CT, uses a “fan beam” (collimated by pre-pt. collimators); Post pt. remnant beam is collimated by a “fan” for the detector array – neither the tube or detector MOVE! • SPR is NOT too successful, but is re-emerging for another breath

  5. Charge Coupled Devices • CCD’s are SMALL, thus GREAT for digital imaging • Have HIGH sensitivity to radiation and WIDE dynamic range (dim to bright light) • STRAIGHT H & D Curve

  6. Types of CCD’s • Cesium Iodide/CCD • Cesium Iodide/Amorphous Silicon • Amorphous Selenium • Not going into digital mammo at this time

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