Lmrt core / radiation & safety EXAM(Answered;graded A+)

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