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PHYSICS

TermDefinition
CONTROLLING FACTOR OF CONTRAST KVP IS MAIN CONTROLLING FACTOR (HAS IN DIRECT RELATIONSHIP TO CONTRAST)
FILTRATION BEAM ATTENUATORS (DECREASE SKIN EXPOSURE TO PATIENT)
GRIDS TO DENSITY INCREASE IN GRID RATIO WILL DECREASE
RECORDED DETAIL (CAN BE AFFECTED BY) SID, OID, FOCAL SPOT, & MOTION
SID & DETAIL DIRECTLY PROPORTIONAL (MORE DISTANCE = MORE DETAIL)
OID & DETAIL INDIRECTLY PROPORTIONAL (LESS DISTANCE = MORE DETAIL) LESS MAGNIFICATION
DISTORTION TYPES SHAPE (ELONGATION/FORSHORTENING)OR SIZE DISTORTION(MAGNIFICATION)
GREATER SID LESS MAGNIFICATION (INDIRECT RELATIONSHIP)
GREATER OID GREATER MAGNIFICATION (DIRECT RELATIONSHIP)
DENSITY OVERALL BLACKNESS PRODUCED ON THE IMAGE (A LOT OF DENSITY = DECREASE IN BRIGHTNESS)
FACTORS THAT AFFECT DENSITY MAS, SID, KVP, GRIG, FILTRATION, BEAM RESTRICTION, FILM SCREEN COMBO
MAS AMOUNT OF RADIATION EXPOSURE
MAS TO DENSITY HAS DIRECT PROPORTIONAL (INCREASE IN MAS = INCREASE IN )
DOUBLE MAS = DOUBLE DENSITY 20 MAS 80 KVP 40 MAS 80 KVP (DOUBLED MAS)
MAS TO CONTRAST HAS NO AFFECT ON MAS
KVP ENERGY
KVP TO DENSITY HAS DIRECT RELATIONSHIP / NOT PROPORTIONAL (DOUBLE DENSITY-INCREASE KVP BY 15%)
DOUBLE KVP = 15% INCREASE 20 MAS 80 KVP 20 MAS 92KVP (DOUBLED DENSITY)
CONTROLLING FACTOR OF CONTRAST KVP IS MAIN CONTROLLING FACTOR (HAS IN DIRECT RELATIONSHIP TO CONTRAST)
KVP TO CONTRAST INCREASE TO KVP = DECREASE TO CONTRAST
SID SOURCE TO IMAGE DISTANCE
SID TO CONTRAST SID HAS NO AFFECT
GRID ELIMINATES SCATTER RADIATION PRIOR TO INTERACTING WITH IR
FILTRATION TO DENSITY FILTRATION INCREASE WILL DECREASE
FILTRATION TO LOW ENERGY ABSORBS LOW ENERGY TO PATIENT BUT NOT GO FOR IMAGE
BEAM RESTRICTION COLLIMATION (LESS AREA FOR PHOTONS TO REACH)
INCREASE BEAM RESTRICTION (COLLIMATE SMALLER) DECREASES FIELD SIZE, DECREASES DENSITY
COLLIMATION TO DENSITY INDIRECT RELATIONSHIP TO DENSITY
INCREASE BEAM RESRTICTION DECREASE SCATTER , INCREASE CONTRAST, DIRECT RELATIONSHIP
ANODE HEEL EFFECT A PHENOMENON IN WHICH THE THE INTENSITY OF THE X-RAY BEAM IS GREATER TOWARDS THE CATHODE SIDE OF THE TUBE. THE VARIATION IN X-RAY INTENSITY ALONG THE LONGITUDINAL TUBE AXIS
CONTRAST DEGREE OF DIFF BETWEEN ADJACENT DENSITIES (RESULT OF TISSUE DIFFERENTIAL ABSORPTION OF THE XRAY PHOTONS)
HIGH CONTRAST SHORT SCALE = LOW KVP RADIOGRAPH WITH FEW DENSITIES BUT GREAT DIFF BETWEEN THEM - HAND, TIB/FIB
LOW CONTRAST HIGH SCALE = HIGH KVP RADIOGRAPH WITH LARGE NUMBER OF DENSITIES WITH LITTLE DIFF AMONG THEM - CHEST, PELVIS
CONTRAST IS AFFECTED BY TISSSUE THICKNESS, DENSITY, EFECTIVE AUTOMIC NUM.
QUALITY OF BEAM (CONTRAST) AFFECTS ATTENUATION WHICH IN RETURN AFFECTS SUBJECT CONTRAST
CHEST XRAY HAS HIGH OR LOW CONTRAST LOW CONTRAST (DIFF TISSUE THICKNESS, AUTOMIC #)
ABDOMEN WOULD HAVE HIGH OR LOW CONTRAST LOW CONTRAST (ORGANS ARE SIMILAR)
OID OBJECT IMAGE DISTANCE (SPACE FROM SUBJECT TO IR)
OID TO CONTRAST IF OID INCREASES, CONTRAST WILL INCREASE BECAUSE OF THE AIR GAP. ROOM FOR THE SCATTER PHOTONS TO DIVERGE
KVP FACTS INCREASE KVP = INCREASE IN DENSITY KVP IS THE SQUARE OF DENSITY INCREASE KVP = DECREASE IN CONTRAST NOTHING TO DETAIL NOTHING TO DISTORTION
MAS FACTS DOUBLE MAS = DOUBLE DENSITY NO AFFECT ON ON CONTRAST NOTHING ON DETAIL NOTHING ON DISTORTION
TUBE PART ANGLE INCREASE ANGLE = DECREASE DENSITY INCREASE ANGLE = DECREASE DETAIL INCREASE ANGLE = INCREASE DISTORTION NOTHING TO CONTRAST
FOCAL SPOT SIZE INCREASE FOCAL SPOT = DECREASE DETAIL NOTHING TO DENSITY NOTHING TO CONTRAST NOTHING TO DISTORTION
OID FACTS INCREASE TO OID = DECREASE TO DENSITY INCREASE TO OID = INCREASE TO CONTRAST INCREASE TO OID = INCREASE TO DISTORTION INCREASE TO OID = DECREASE TO DETAIL
SID FACTS INCREASE SID = DECREASE TO DENSITY INCREASE SID = DECREASE TO DISTORTION INCREASE SID = INCREASE TO DETAIL NOTHING TO CONTRAST
BEAM RESTRICTION (COLLIMATION) INCREASE BEAM RESTRICTION = DECREASE DENSITY INCREASE BEAM RESTRICTION = INCREASE CONTRAST NOTHING ON DETAIL NOTHING ON DISTORTION
FILTRATION FCATS NCREASE FILTRATION = DECREASE CONTRAST INCREASE FILTRATION = DECREASE DENSITY NOTHING ON DISTORTION NOTHING ON DETAIL
GRID FACTS INCREASE GRID = DECREASE DENSITY INCREASE GRID = INCREASE CONTRAST NOTHING TO DETAIL NOHTING TO DISTORTION
Created by: CHILLFCTR007