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Title:

IMAGE ACQUISITION

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Title: IMAGE ACQUISITION Author: rose Last modified by: Montgomery College Created Date: 11/20/2006 12:13:17 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: IMAGE ACQUISITION


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
DEVELOPER
  • 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

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
  • YESYOU 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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