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IMAGE ACQUISITION

IMAGE ACQUISITION. FILM SCREEN SYSTEM. PROCESSING THE LATENT IMAGE. AUTOMATIC DARKROOM PROCESSOR DAYLIGHT PROCESSOR 45 SECONDS TO 3.5 MINUTE PROCESSORS PROCESSOR CAPACITY=# OF FILMS THAT CAN BE PROCESSED PER MINUTE LARGER FILM SIZES TAKE LONGER TO GO THROUGH THE PROCESSING CYCLE .

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IMAGE ACQUISITION

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  1. IMAGE ACQUISITION FILM SCREEN SYSTEM

  2. PROCESSING THE LATENT IMAGE • AUTOMATIC • DARKROOM PROCESSOR • DAYLIGHT PROCESSOR • 45 SECONDS TO 3.5 MINUTE PROCESSORS • PROCESSOR CAPACITY=# OF FILMS THAT CAN BE PROCESSED PER MINUTE • LARGER FILM SIZES TAKE LONGER TO GO THROUGH THE PROCESSING CYCLE

  3. FOUR STAGES OF PROCESSING • DEVELOPER • FIXER • WASH • DRY

  4. LATENT TO MANIFEST IMAGE AMPLIFY AMOUNT OF ATOMIC SILVER AT SENSITIVITY SPECK REDUCE THIS SILVER TO METALLIC SILVER METALLIC SILVER TRANSLATES TO VARIOUS RADIOGRAPHIC DENSITIES UNEXPOSED SILVER HALIDE DOES NOT REACT TO THE DEVELOPING CHEMICALS UNLESS… DEVELOPER

  5. DEVELOPER CONT. • THE FILM STAYS IN THE DEVELOPING CYCLE TOO LONG • OR • THE DEVELOPING TEMP. IS TOO HIGH • WHAT MIGHT CAUSE A FILM TO STAY TOO LONG IN THE DEVELOPER?

  6. DEVELOPING AGENTS • YES…YOU NEED TO KNOW AGENTS BUT YOU DO NOT NEED TO KNOW THE SPECIFIC CHEMICALS • DEVELOPING OR REDUCING AGENTS • ACCELERATOR OR ACTIVATOR • ALKALINE • RESTRAINER • PRESERVATIVE • HARDENER

  7. FIXING • PRIMARY FUNCTION? • FIXING AGENT • ACIDIFIER • PRESERVATIVE • HARDENER • SOLVENT • HYPORETENSION

  8. THE PROCESSOR • FEED TRAY • ENTRANCE ROLLER ASSEMBLY • AUDIBLE SIGNAL • ACTIVATES REPLENISHMENT SYSTEM (CIRCULATORY SYSTEM) • TRANSPORT ROLLERS • SQUEEGIE ASSEMBLY • TURNAROUND ROLLER • CROSSOVER ROLLER • GUIDE PLATES

  9. MORE TERMS • MICROSWITCH • REPLENISHMENT • OXIDATION • AERIAL/USE • FILM ORIENTATION • TEMPERATURE • 93 DEGREES TO 95 DEGREES • 50% HUMIDITY-DARKROOM • ARTIFACTS PGS 218-221

  10. DIGITAL ACQUISITION • DYNAMIC RANGE =RANGE OF VISIBLE IMAGES • MATRIX AND PIXELS • THE LARGER THE MATRIX THE SMALLER THE PIXEL SIZE • THE LARGER THE MATRIX THE GREATER THE NUMBER OF PIXELS

  11. DIGITAL ACQUISTION - CR • IMAGING PLATE IS PLACED INTO A READER • INSIDER THE READER THE PLATE IS SCANNED BY A LASER WHICH RELEASES THE TRAPPED X-RAY ENERGY AS VISIBLE LIGHT • THE PMT (PHOTOMULTIPLIER TUBE) COLLECTS, AMPLIFIES AND CONVERTS THE LIGHT INTO AN ELECTRICAL SIGNAL

  12. DIGITAL ACQUISTION - CR • SIGNAL IS ANALYZED TO THE PREPROGRAMMED INFORMATION • ELECTRIC SIGNAL IS CONVERTED FROM ANALOG DATA TO DIGITAL DATA • LASER SCANS PLATE TO ERASE THE PLATE THOROUGHLY FOR NEXT EXPOSURE

  13. DIGITAL ACQUISTION - DR • CCD • FLAT PANEL • INDIRECT CONVERSION DETECTORS • DIRECT CONVERSION DETECTORS

  14. DIGITAL ACQUISTION – ADDITIONAL TERMS • HISTOGRAM • ALGORITHMS • POST PROCESSING • WINDOW LEVEL • WINDOW WIDTH • NOISE • DICOM • PACS

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