Lmrt core / radiation & safety questionsand answers 2024/25 update

high potential difference - CORRECT ANSWER Required to move the electron stream rapidly across the X-ray tube/ VOLTAGE Unit of potential difference - CORRECT ANSWER Volts patient dose: - CORRECT ANSWER calculated as ESE (entrance skin exposure) Transformer that has more windings on primary side: - CORRECT ANSWER stepdown Factors that affect xray QUALITY: - CORRECT ANSWER kvp & filtration How does scatter rad fog reduce visability of detail in image? - CORRECT ANSWER it decreases contrast Contrast is directly influenced by: - CORRECT ANSWER fog & collimation What minimizes shape distortion? - CORRECT ANSWER - position plane of subject parallel to IR - position CR perp to IR and subject Prime factors for exposure: - CORRECT ANSWER milliamperage exposure time kvp SID Precise area of target where xray beam strikes: - CORRECT ANSWER actual focal spot inverse square law - CORRECT ANSWER intensity of xray beam is inversely proportional to the square of the distance Essential elements for xray production: - CORRECT ANSWER a target a vacuum an electron source a high potential difference kvp increases then Compton scatter: - CORRECT ANSWER increases What reduces amt of scatter radiation fog on xray? - CORRECT ANSWER decrease kvp Lead equivalent for protective aprons - CORRECT ANSWER 0 5 mm scatter radiation fog will: - CORRECT ANSWER increase density decrease contrast reduce visibility of detail Velocity - CORRECT ANSWER electromagnetic energy mixes through space at this rate if mA doubles, QUANTITY of exposure: - CORRECT ANSWER doubles annual effective dose limit - CORRECT ANSWER .50 msv