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UNIT 6 RADIOLOGY

PRINCIPLE OF EXPOSURE AND IMAGE QUALITY

QuestionAnswer
DESCRIBE ONE PRIME FACTORS OF EXPOSURE - mA CONTROLS THE # OF ELECTRONS PRODUCED AT THE FILAMENT AND THE QUANITY OF XRAY PHOTONS PRODUCED AT THE NODE
DESCRIBE ONE PRIME FACTOR OF EXPOSURE - Exposure Time CONTROLS HOW LONG THE ELECTRONS CROSS FROM CATHODE TO ANODE. AND HOW LONG THE EXPOSURE WILL LAST
DESCRIBE ONE PRIME FACTOR OF EXPOSURE - kVp CONTROLS THE SPEED (kinetic energy) OF THE ELECTRONS CROSSING FROM CATHODE TO ANOTE AND THE QUALITY (PENETRATING ABILITY) OF THE XRAY PHOTONS PRODUCED
DESCRIBE ONE PRIME FACTOR OF EXPOSURE - SID THE DISTANCE BETWEEN THE XRAY TUBE TARGET AND THE IR
DEFINE DENSITY: REFERS TO HOW DARK OR BLACK AND IMAGE APPEARS
DEFINE CONTRAST: REFERS TO THE DIFFERENCE IN DENSITY BETWEEN ADJACENT AREAS ON AND IMAGE
DEFINE DISTORTION REFERS TO MISREPRESENTATION IN SIZE AND/OR SHAPE OF AN OBJECT ON AN IMAGE
DEFINE DETAIL: REFERS TO THE VISUAL CLARITY OR SHARPENESS OF AN IMAGE
LIST THE PRIMARY CONTROLLER OF DENSITY AND WHAT HAPPENS TO DENSITY IF IT IS CHANGED. A) mAs B) mAs increase = Density Decreased C) mAs decreased = Density Increased
LIST THE PRIMARY CONTROLLER OF CONTRAST AND WHAT HAPPENS TO CONTRAST IF IT IS CHANGED. A)kVp B) AS kVp Increase - Contrast Decreases C) As kVp Decreases - Contrast Increases
DIFFERENTIATE BETWEEN SHORT-SCALE AND LONG-SCALE CONTRAST A) LONG-SCALE = LOW CONTRAST B) SHORT-SCALE = HIGH CONTRAST
DESCRIBE WHAT HAPPENS TO SIZE DISTORTION WHEN SIDE & OID ARE CHANGED SID INCREASED = SIZE DISTORTION DECREASES SID DECREASED = SIZE DISTORTION INCREASES OID INCREASED = SIZE DISTORTION INCRESES OID DECREASED = SIZE DISTORTION DECREASES
DESCRIBE WHAT HAPPENS TO SHAPE DISTORTION WHEN BEAM ANGLE, CR/IR/BODY PART ALIGNMENT IS CHANGED A BEAM ANGULATION INCREASES - SHAPE DISTORTION INCREASES - WHEN ANGULATION DECREASES SHAPE DISTORTION DECREASES
DESCRIBE THE EFFECTS OF SIZE AND SHAPE DISTORTION ON RECORDED DETAIL AN IMAGE VARIES IN ITS SHARPNESS
DESCRIBE HOW VOLUNTARY AND INVOLUNTARY MOTION CAN BE AVOIDED VOLUNTARY - GOOD PT INSTRUCTION AND COMMUNICATION INVOLUNTARY - PROPER POSITIONING - IMMOBILIZATION - SHORT EXPOSURE TIME
Created by: spoon6464