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UNIT 9 RADIOLOGY

CONTROLLING SCATTER RADIATION

QuestionAnswer
HOW DOES SCATTER AFFECT CONTRAST CONTRAST: SCATTER DECREASES IN CONTRAST
HOW DOES SCATTER AFFECT DENSITY DENSITY: AND SCATTER INCREASE IN DENSITIY
WHAT IS THE PRIMARY SOURCE OF SCATTER RADIATION DURING EXPOSURE
HOW DO CHANGES IN kVp and tissure thickness affect scatter and contrast Decreasing kVp will DECREASE SCATTER and INCREASE CONTRAST
HOW DOES CHANGES INFIELD SIZE AFFECT SCATTER AND CONTRAST DECREASING FIELD SIZE REDUCES SCATTER AND INCREASING CONTRAST
WHEN SHOULD A GRID BE USED? SHOULD BE USED WHEN THE BODY PART EXCEEDS 10-12cm THICK OR WHERE THE AMOUNT OF SCATTER WILL INTERFERE WITH THE IMAGE. CHEST-SPINE-PELVIS-ABDOMEN AND LARGE EXTREMITIES
HOW DOES GRID RATIO AFFECT THE ABSORPTION OF SCATTER The higher the grid ratio the more scatter radiation absorbs and the higher the contrast-LIKEWISE- A low grid ratio absorbs less scatter and produces images with lower contrast
WHAT IS A FOCUSED GRID They allow the passage of remnant radiation that is alligned with the lead strips, while absorbing the scatter traveling on an angle
HOW CAN GRID CUT OFF OCCUR? When the primary beam is off center to the gird or the grid is tilted. Also if the wrong SID is used or if the beam is angled against the lead strips
Created by: spoon6464
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