Lmrt core / radiation & safety exam questions & answers 2023/2024
high potential difference - ANSWER-Required to move the electron stream rapidly across the X-ray tube/ VOLTAGE
Unit of potential difference - ANSWER-Volts
patient dose: - ANSWER-calculated as ESE (entrance skin exposure)
...
high potential difference - ANSWER-Required to move the electron stream rapidly across the X-ray tube/
VOLTAGE
Unit of potential difference - ANSWER-Volts
patient dose: - ANSWER-calculated as ESE (entrance skin exposure)
Transformer that has more windings on primary side: - ANSWER-step-down
Factors that affect xray QUALITY: - ANSWER-kvp & filtration
How does scatter rad fog reduce visability of detail in image? - ANSWER-it decreases contrast
Contrast is directly influenced by: - ANSWER-fog & collimation
What minimizes shape distortion? - ANSWER-- position plane of subject parallel to IR
- position CR perp to IR and subject
Prime factors for exposure: - ANSWER-milliamperage
exposure time
kvp
SID
Precise area of target where xray beam strikes: - ANSWER-actual focal spot
, inverse square law - ANSWER-intensity of xray beam is inversely proportional to the square of the
distance
Essential elements for xray production: - ANSWER-a target
a vacuum
an electron source
a high potential difference
kvp increases then Compton scatter: - ANSWER-increases
What reduces amt of scatter radiation fog on xray? - ANSWER-decrease kvp
Lead equivalent for protective aprons - ANSWER-0 5 mm
scatter radiation fog will: - ANSWER-increase density
decrease contrast
reduce visibility of detail
Velocity - ANSWER-electromagnetic energy mixes through space at this rate
if mA doubles, QUANTITY of exposure: - ANSWER-doubles
annual effective dose limit - ANSWER-.50 msv
When incoming photon interacts with atom in its body: - ANSWER-creates photoelectric effect / its
totally absorbed by the atom
SI unit if exposure measured in the air: - ANSWER-air kerma (Gy-a)
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