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Fluroscopy
Image Intensification
| Question | Answer |
|---|---|
| WHAT IS THE MAJOR PURPOSE OF FLUOROSCOPY? | IMAGE OBJECTS IN MOTION (DYNAMIC IMAGING) |
| rt ONLY PERFORM FLUOROSCOPY FOR DIAGNOSTIC PURPOSES NOT FOR STATIC IMAGING. T/F | FALSE - ONLY FOR STATIC IMAGING; NOT A POSITIONING PREVIEW |
| PRIOR TO THE IMAGE INTENSIFICATION (II) SCREENS WHAT DID WE USE? | DARK FLUOROSCOPY - ZINC CADMIUM SULFIDE HAND HELD ATTACHED TO TABLE |
| WHAT TWO II SCREENS DO WE USE TODAY? | INPUT - CESIUM IODIDEOUTPUT - ZINC CADMIUM SULFIDE |
| LIGHT SENSORS ON THE PERIPHERY OF THE RETNA THAT ARE RESPONSIBLE FOR NIGHT VISION. | RODS |
| LIGHT SENSORS ON CENTER OF RETNA THAT ARE RESPONSIBLE FOR DAY VISION. | CONES |
| NIGHT VISION IS ALSO KNOWN AS _____ _____. | SCOPTIC VISION |
| pHOTOSCOPIC VISION IS ANOTHER NAME FOR ______ ______. | DAY VISION |
| WHAT ARE SOME DISADVANTAGES OF DARK FLUOROSCOPY? | LARGE DOSE TO RAD; NEED TO DARK ADAPT EYES; MIRROR OPTICS ONLY ALLOWED FOR ONE VIEWER |
| DOES THE II OPERATE AT HIGH OR LOW mA? | low mA - .5 - 5 mA |
| WHAT IS INTERMITTENT FLUORO? | PULSED FLUORO, SIMPLY TAKING YOUR FOOT OFF THE FLUORO PEDAL, reduce exposure without compromising a procedure |
| WHAT ALARA STANDARD IS PLACED SO THE RADIOLOGIST AND THE TECHNOLOGISTS ARE AWARE OF THE LENGTH OF TIME THEY HAVE BEEN FLUOROING? | 5 MINUTE ALARM |
| wHAT IS THE MINIMUM SOD FOR THE II SCREEN? C-ARM? | 15" AND 12" |
| WHEN RELEASE THE ____________ WILL AUTOMATICALLY SHUT OFF. | HAND OR FOOT DEADMAN SWITCH |
| WHAT ARE SOME ADVANTAGES TO USING THE II SCREENS? | USE PHOTOPIC VISION (DAY CONE VISION); INCREASE VISUAL ACUITY, DOES NOT NEED DARK ADAPTATION, AMPLIFIES BRIGHTNESS, VACUUM TUBE |
| ABILITY OF THE EYE TO DISCRIMINATE SMALL DETAILS. | VISUAL ACUITY |
| WHAT COMPONENT OF OF THE II HELPS TO MAKE THE TUBE A VACUUM? | GLASS ENVELOPE |
| wHAT MATERIAL IS THE INPUT PHOSPHOR MADE OF? | CESIUM IODIDE |
| WHY IS THE INPUT PHOSPHOR MADE TO MATCH THE SHAPE OF THE OUTPUT PHOSPHOR? | IT IS CONCAVE TO DECREASE DISTORTION |
| XRAYS INTERACT WITH THE INPUT PHOSOPHOR CREATING _________. | LIGHT |
| CHARGED ELECTRODES PLATED ONTO THE INSIDE OF THE GLASS ENVELOPE TO ACCELERTE AND FOCUS ELECTRON STREAM. | ELECTROSTATIC FOCUSING LENSES |
| CONVERT LIGHT TO ELECTRONS FROM INPUT PHOSPHOR. | PHOTOCATHODE |
| WHAT MATERIAL IS THE PHOTOCATHODE MADE OF? | PHOTOEMISSIVE CESIUM AND ANTIMONY |
| THE FOCUSING LENSES FOCUS OPTICALLY, WHAT HAPPENS TO THE IMAGE? | THE IMAGE IS INVERTED ON THE OUTPUT PHOSPHOR |
| THE PHOTO CATHODE IS COATED ON THE ________ OF THE TUBE. | INPUT SIDE |
| WHERE IS THE ANODE LOCATED? IS IT A ROTATING OR FIXED TARGET? | IN FRONT OF THE OUTPUT PHOSPHOR; FIXED |
| WHAT IS THE CONSTANT POTENTIAL DIFFERENCE WITHIN THE II? | 25 kVp |
| WHAT MATERIAL IS USED FOR THE OUTPUT PHOSPHOR? | ZINC CADMIUM SULFIDE |
| WHAT IS PLACED UNDER THE OP TO ABSORB ISOTROPIC LIGHT AND DECREASE BACKFLOW TO IP? | OPAQUE FILTER |
| BRIGHTNESS GAIN | INCREASE IN IMAGE INTENSITY |
| UNIT OF LIGHT | CANDELLA |
| CONVERSION EFFICIENCY | FLUX GAIN |
| AUTOMATICALLY ADJUSTS TECHNIQUE TO MAINTAIN DENSITY AND CONTRAST. | AUTOMATIC BRIGHTNESS CONTROL (ABC) OR AUTOMATIC DOSE CONTROL (ADC) OR AUTOMATIC BRIGHTNESS STABILIZATION (ABS) |
| A SLOW RESPONSE TIME IS TERMED ______. | LAG |
| PINCUSION EFFECT | EDGE DISTORTION DUE TO CURVE AND REPULSION OF ELECTRONS |
| REDUCTION OF IMAGE BRIGHTNESS AT THE PERIPHERY COMPARED TO THE IMAGE CENTER. | VIGNETTING |
| QUANTUM MOTTLE | BLOTCHY, GRAINY APPEARANCE |
| WHAT ARE THE TWO TYPES OF VIDEO CAMERA TUBES? | VIDICON AND PLUMBICON (FASTER RESPONSE TIME) |
| WHAT IS THE PURPOSE OF THE VIDEO CAMERA TUBE? | MOUNTED ON TOP OF II; CONVERTS LIGHT IMAGE INTO VIDEO SIGNAL |
| HOW DO THEY VIDEO CAMERA TUBES AVOID FLICKER? | BY DIVIDING THE SCREEN IN 1/2 |
| TO ALLOW FOR SPOT FILMS, USE _____ _____. | BEAM SPLITTERS |
| What is the leakest link in the system that causes a loss of resolution? | tv monitor |
| WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF PHOTO SPOT FILMS AND CASSETTE SPOT FILMS? | PHOTO - ADV. LESS INTERUPTION OF FLUORO TIME; NO INCREASE IN PT. DOSE; DISADV. IMAGE SIZE IS SMALLCASSETTE - ADV. BIGGER IMAGE; DISADV. INTERRUPTION OF FLUORO TIME; INCREASE IN EXPOSURE |
| THE HIGHEST ENERGY OF SCATTER OCCURS AT ____ DEGREES TO THE PATIENT AND LOWEST AT ____ TO THE TECH. | 180-90 |
| WITH VIGNETTING YOU GET A LOSS OF ________, WHILE WITH PINCUSHIONING YOU GET A LOSS OF ______. | BRIGHTNESS, RESOLUTION |
| HOW DO YOU DETERMINE FLUX GAIN? | NUMBER OF OUTPUT LIGHT PHOTONS OVER THE NUMBER OF INPUT XRAY PHOTONS |
| oUTPUT PHOSPHOR ILLUMINATION OVER INPUT EXPOSURE RATE | CONVERSION FACTOR |
| MINIFICATION GAIN TIMES FLUX GAIN. | BRIGHTNESS GAIN |
| WHAT CCD STAND FOR? | CHARGED COUPLED DEVICE VIDEO CAMERA |
| sEMICONDUCTOR THAT SOTRES A CHARGE FROM LIGHT ON A PHOTOSENSITIVE SURFACE. STORES FREED ELECTRONS AS LATENT IMAGE; ELIMINATES LAG; converts analog to electronic signal | CCD |
Created by:
sr4095
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