rad 206 p05 fundamentals of imaging - fluoroscopy
TRANSCRIPT
Fundamentals of Imaging
RAD 206
Image Production
Fluoroscopic Imaging system
Fluoro : fluorescent screen
Scope : viewing; look at carefully; scan; assess or investigate something.
Microscope , telescope , arthroscopy, endoscope, kaleidoscope, stethoscope
Fluoroscopyis an imaging technique that uses X-rays to obtain real-time moving images.
Fluoroscopic Imaging system
Conventional Image intensifier
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1000 light photons at the photocathode from 1 x-ray photon Output phosphor = 3000 light photons (3 X more than at the input phosphor!) This increase is called the flux gain FLUX GAIN
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Fluoroscopic Imaging system
Digital (DDR / Flat Panel)
• AMORPHOUS SILICON (indirect) X-ray photon to light photon to electron
• AMORPHOUS SELENIUM (direct = No light) X-ray photon to electron
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Direct Capture
Indirect Capture
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CCD Array with a scintillation phosphor
Fluoroscopic Imaging system
Digital (CCD Array )3
Charge-Coupled Device CCD, which is the light-sensing element. The CCD is a silicon-based semiconductor has three principal advantageous imaging characteristics: sensitivity, dynamic range, and size.
Fluoroscopic Imaging system
Digital (CCD Array )3
Display Types CRT : Cathode Ray Tube
LCD : Liquid Crystal Display
Plasma Display
LED : Light Emitting Diode
OLED , AMOLED , EPD (electrophoretic display)
Things to note Over-Couch tube Under-Couch tube
Under-couch tubes produces lesser scatter radiation that reaches the staff
Reducing the OID produces lesser scatter radiation that reaches the staff
Digital Abbreviations/ Acronyms