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FLUOROSCOPIC DATA AQUSITION-FLUOROSCOPIC DATA AQUSITION-IMAGE INTENSIFIED SYSTEMIMAGE INTENSIFIED SYSTEM
1. X-RAY TUBE2. PATIENT3. IMAGE INTENSIFIER4. OUTPUT PHOSPHOR5. CAMERA6. MONITOR
ADVANTAGE OF DF OVER ADVANTAGE OF DF OVER CONVENTIONAL I.I. CONVENTIONAL I.I.
FLUOROSCOPYFLUOROSCOPY
SPEED OF IMAGE ACQUISITION
POSTPROCESSING
DURING DF TUBE OPERATES IN DURING DF TUBE OPERATES IN RADIOGRAPHIC MODERADIOGRAPHIC MODE
( HIGH mA value)( HIGH mA value)
TUBE HEAT OVERLOAD!!!TUBE HEAT OVERLOAD!!!
NO, BEACAUSE OF PULSED BEAM!!!NO, BEACAUSE OF PULSED BEAM!!!
PULSED PROGRESSIVE PULSED PROGRESSIVE FLUOROSCOPYFLUOROSCOPY
IMAGE ACQUSITION TIME IMAGE ACQUSITION TIME ( CAPTURE) IN FLUORO( CAPTURE) IN FLUORO
1/SEC TO 10/SEC
TUBE INTERROGATION TUBE INTERROGATION TIMETIME
THE TIME REQUIRED FOR THE X-RAY TUBE TO BE SWITCHED ON
GENERATORS IN DIGITAL GENERATORS IN DIGITAL FLUOROSCOPYFLUOROSCOPY
THREE PHASE
HIGH FREQUENCY
EXTINCTION TIME < 1 ms
CCD SYSTEM ADVANTAGE CCD SYSTEM ADVANTAGE OVER CAMERA SYSTEMOVER CAMERA SYSTEM
HIGH DQE LOW LEVEL OF ELECTRONIC NOISE HIGH SPATIAL RESOLUTION NO LAG OR BLOOMING NO MAINTENANCE UNLIMITED LIFE UNAFFECTED BY MAGNETIC FIELD LINEAR RESPONSE LOWER DOSE
TEMPORAL SUBTRACTIONTEMPORAL SUBTRACTION
IMAGE OBTAINED AT ONE TIME IS SUBTRACTED FROM THE IMAGE OBTAINED AT THE LATER TIME
ENERGY SUBTRACTIONENERGY SUBTRACTION
USES TWO DIFFERENT X-RAY BEAMS ALTERNATELY TO PROVIDE A SUBTRACTION IMAGE RESULTING FROM DIFFERENCES IN PHOTOELECTRIC INTERACTION