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MCC Processing

Unit 4 Review

QuestionAnswer
WHAT IS LUMINESCENCE EMISSION OF LIGHT FROM A SUBSTANCE BOMBARDED WITH RADIATION
WHAT IS FLOURESCENCE LIGHT EMISSION ONLY WHILE BEING ENERGIZED (DESIRABLE IN INTENSIFYING SCREENS)
WHAT IS PHOSPHORESCENCE AFTER GLOW (GLOWS IN THE DARK)....LIGHT CONTINUES TO EMITTED FOR SOME TIME AFTER RADIATION EXPOSURE HAS ENDED
WHAT ARE THE ADVANTAGES OF INTESIFYING SCREENS TO REDUCE PATIENT DOES, INCREASE CONTRAST OF IMAGES AND INCREASE TUBE LIFE DUE TO LOWER EXPOSURES
WHAT ARE THE DISADVANTAGES OF INTENSIFYING SCREENS REDUCED RESOLUTION (DETAIL SHARPNESS)
WHAT IS THE SUBSTRATUM LAYER THE BONDING LAYER BETWEEN THE BASE AND PHOSPHOR LAYER. IT MAY BE REFLECTIVE, ABSORPTIVE OR TRANSPARENT
WHAT ARE THE CHARACTERISTICS OF REFLECTIVE AND ABSORPTIVE REFLECTIVE INCREASES SPEED AND DECREASES RESOLUTION (OR INCREASES UNSHARPNESS) AND ABSORPTIVE HAVE ADDED COLOR DYE, PREVENTS REFLECTION AND IS FOUND IN SLOWER SCREENS
WHICH LAYER IS THE ACTIVE LAYER PHOSPHOR LAYER
PHOSPHOR LAYER IS A FLOURESCENT LAYER THAT CONTAINS PHOSPHOR CRYSTALS SUSPENDED IN POLYURETHANE. IT INCREASES RESOLUTION BUT DECREASES SPEED
WHAT ARE THE RARE EARTH PHOSPHORS GANDLINIUM OXISULFIDE, LANTHANUM OXISULFIDE, LANTHANUM OXIBROMIDE, YTTRIUM OXISUFIDE AND YTTRIUM TANTALATE.
THE THICKER THE PHOSPHOR LAYER......... THE FASTER THE SPEED, DECREASE IN RESOLUTION (LARGER CRYSTALS)
THE THINNER THE LAYER OF PHOSPHOR.......... THE SLOWER THE SPEED AND SMALLER THE CRYSTALS (HIGHER RESOLUTION)
RARE EARTH PHOSPHORS ABSORB HOW MUCH MORE XRAYS THAN CaW04 (CALCIUM TUNGSTATE) 5 TIMES MORE ABSORPTION
CONVERSION EFFICIENCY IS THE ABILITY TO EMIT MANY LIGHT PHOTONS FOR EVERY XRAY ABSORBED
WHAT IS THE CONVERSION EFFICIENCY OF RARE EARTH COMPARED TO CALCIUM TUNGSTATE 15-20% OR 4-5 TIMES HIGHER
CALCIUM TUNGSTATE GLOWS BLUE WHILE RARE EARTHS GLOW GREEN
RARE EARTH INCREASES SPEED WITHOUT......... COMPROMISING RESOLUTION
QUANTUM MOTTLE IS USING FEW # OF PHOTONS TO MAKE AN IMAGE
FEWER PHOTONS (HIGH NOISE) = GRAINIER THE IMAGE
MORE PHOTONS (LOW NOISE) = SMOOTHER IMAGE
WHAT IS THE SPEED OF AN INTENSIFYING SCREEN THE RELATIVE MEASURE OF THE SCREENS ABILITY TO GIVE OFF LIGHT
IF MORE LIGHT MEANS FASTER SPEED AND LESS EXPOSURE THEN LESS LIGHT WOULD MEAN SLOWER SPEED AND MORE EXPOSURE
WHAT IS SPATIAL RESOLUTION/IMAGE BLUR THE ABILITY TO PRODUCE AN ACCURATE, CLEAR IMAGE OF AN OBJECT'S DETAIL (SHARP IMAGE)
HOW IS SPATIAL RESOLUTION MEASURED IN LINE PAIRS/MM (6-15LP/MM)
IF THE CRYSTAL SIZE INCREASES SPEED WHAT HAPPENS TO THE RESOLUTION IT DECREASES
IF THE PHOSPOR LAYER THICKNESS INCREASES THE SPEED WHAT HAPPENS TO THE RESOLUTION IT DECREASES
THE REFLECTIVE LAYER INCREASES THE SPEED AND DOES WHAT TO THE RESOLUTION DECREASES
THE ABSORPTIVE LAYER DECREASES THE SPEED AND THE RESOLUTION INCREASES
CROSSOVER INCREASES THE SPEED BUT __________ THE RESOLUTION DECREASES
WHAT EFFECT DOES QDE HAVE ON SPEED AND RESOLUTION IT INCREASES THE SPEED BUT HAS NO EFFECT ON RESOLUTION
WHAT EFFECT DOES CONVERSION EFFICIENCY HAVE ON SPEED AND RESOLUTION IT INCREASES THE SPEED BUT HAS NO EFFECT ON RESOLUTION
TRUE OR FALSE, SPEED AND RESOLUTION ARE INVERSLY RELATED TRUE
WHAT IS THE FORMULA FOR THE INTENSIFICATION FACTOR EXPOSURE WITHOUT SCREENS / EXPOSURE WITH SCREENS SO IF 200MAS/5MAS = 40 THEREFORE IT WOULD BE 40 X'S MORE EFFICIENT WITH INTENSIFYING SCREENS
WHAT IS THE FORMULA FOR SPEED SPEED 1 = MAS 2 / SPEED 2 = MAS 1
AS SPEED GOES UP TECHNIQUE GOES DOWN
DIRECT EXPOSURE REQUIRES HOW MUCH MORE RADIATION THAN WITH INTESIFYING SCREENS 20-50 TIMES MORE RADIATION
SPECTRAL COLOR EMISSION OF A SCREEN IS PAIRED WITH......... THE SPECTRAL SENSIVITY OF THE FILM
A MISMATCH OF SCREEN MATCHING RESULTS IN LOSS OF RESPONSE OF THE FILM OR A LIGHT DENSITY
GREEN EMISSION SCREEN IS PAIRED WITH (RARE EARTH) A GREEN SPECTRAL SENSITIVITY FILM
A BLUE EMISSION SCREEN IS PAIRED WITH (CALCIUM TUNGSTATE) A BLUE SPECTRAL SENSITIVITY FILM
WHAT PERCENTAGE OF THE XRAY FILM EXPOSURE IS DUE TO THE LIGHT EMITTED BY THE SCREEN PHOSPHORS 95-98%
THE PRINCIPLE ADVANTAGE OF DIRECT EXPOSURE RADIOGRAPHY COMPARED TO SCREEN RADIOGRAPHY IS INCREASED RESOLUTION
WHEN WOULD YOU USE DIRECT EXPOSURE FOR SMALL PARTS SUCH AS A FINGER OR HAND
THE EMISSION OF LIGHT FROM A PHOSPHOR AFTER INCIDENT RADIATION EXPOSURE IS PHOSPHORESCENSE
THE EFFECT OF QUANTUM MOTTLE IS MOST COMMONLY SEEN WHEN A _________________IS EMPLOYED FAST FILM SCREEN COMBO
RARE EARTH PHOSPHORS ARE A SIGNIFICANT IMPROVEMENT OVER CALCIUM TUNGSTATE SCREEN LARGELY DUE TO THEIR HIGH CONVERSION EFFICIENCY OR ABSORPTION EFFICIENCY
THE PRIMARY ADVANTAGE OF THE USE OF RARE EARTH PHOSPHORS IS TO REDUCE PATIENT DOSE
HOW DO YOU DETERMINE POOR SCREEN CONTACT BY PERFORMING A WIRE MESH TEST
IF A NON SCREEN EXPOSURE REQUIRES 100 MAS AND 75 KEV AND A 100 SPEED SCREEN IS USED AT 5 MAS WITH 75 KEV WHICH GIVES THE SAME RADIATION, WHAT IS TEH INTENSIFYING FACTOR 100 MAS / 5 MAS = 20 TIMES
A RADIOGRAPH IS TAKEN WITH A 50 SPEED SCREEN NON BUCKY USING 40 MAS @ 80 KVP. IF RARE EARTH SCREEN (400) WAS SUBSTITUTED WHAT IS THE NEW MAS SPEED 1 = MAS 2 / SPEED 2 / MAS 1 THEREFORE 400 / 50 = 8 SO 40 / 8 = 5 MAS
Created by: misha1228