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PHYSICS
| Term | Definition |
|---|---|
| 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
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