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Computed Radiography Direct

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    1. Computed Radiography & Direct/Indirect Digital Radiography Dong-kwan, Kim radiation25@hotmail.com

    2. ? ? DR(Digital Radiography)? ?? CR(Computed Radiography) Direct/Indirect Digital Radiography ? DR Detectors ? DR Image Preprocessing

    3. Digital radiograpy ? ?? ??????? Digital? ? TFT(Thin Film Transistor) ? F P D(Flat Panel Detector) ??? ?? ????

    4. Digital & Analog

    5. X-ray Imaging Technologies

    6. Computed Radiography

    7. Reading

    8. Recording/Reading/Erasing Cycle

    9. Image Plate (IP)

    10. IP ???? 1.??? ?? ???? ???? Eu++? Eu+++? ??, ?? ?? 2.?????? Fluoride Center(F+)? ?? 3.??? ???? Subsequent Exposure ?? ???? ????? ?? ? ??? ?????? ?? 4.??? ???? Eu++??? ??? ?? 390nm? ??? ???? ???? Eu++? ??? ?? 5.Phosphor??? ????? ??? 7?sec Light Exposure ??? ?????

    11. Digital Fluoroscopy

    12. CCD Technologies

    13. Selenium Technology

    14. Image Quality Parameters

    15. Contrast / Dynamic Range

    16. Limiting Spatial Resolution (LSR)

    17. Signal to Noise Ratio (SNR)

    18. Impact of Noise Quantum and electronic noise are unavoidable in a digital imaging chain. The effect, often expressed as signal-to-noise ratio (SNR), can vary widely from system to system. Signal Useful Image Formation ---------- = -------------------------------------- Noise Erratic Information

    19. Modulation Transfer Function (MTF)

    20. Digital Detector Outperforms ...

    21. DR Data Processing ? Penetration X-ray Photon Data? FPD?? Electrical Analog Signal? ?? ? A/D Conversion Processing ?? ? Pixel Data(Gray Scale)? ?? ? DSP ??(Noise ??)

    22. Quality Assurance Plan Image Quality Signature Test (IQST) Phantom

    23. FDA Standard Parameters at Digital Radiography System Requirements : at DN-5 Condition 1) Horizontal MTF data sheets / Comparing Internet data 2) Vertical MTF data sheets / Comparing Internet data 3) DQE data sheets / Comparing Internet data 4) Low no of dead pixels 5) High resolution Monitor > 2k * 2k

    24. Digital Mammography

    25. Digital Mammography - Productivity