For SID indicator accuracy, it needs to be within what tolerance of the measured value?

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Multiple Choice

For SID indicator accuracy, it needs to be within what tolerance of the measured value?

Explanation:
SID indicator accuracy is about how faithfully the displayed distance matches the actual source-to-image distance. A small error changes magnification and the expected dose, so QA uses a tight tolerance. The standard tolerance is within two percent of the measured value, meaning if the true SID is 100 cm, the indicator should read between 98 and 102 cm. A looser tolerance like five or ten percent would allow noticeable geometric distortion and dose errors, while a much tighter one would be impractical. That’s why the within-two-percent range is the appropriate requirement.

SID indicator accuracy is about how faithfully the displayed distance matches the actual source-to-image distance. A small error changes magnification and the expected dose, so QA uses a tight tolerance. The standard tolerance is within two percent of the measured value, meaning if the true SID is 100 cm, the indicator should read between 98 and 102 cm. A looser tolerance like five or ten percent would allow noticeable geometric distortion and dose errors, while a much tighter one would be impractical. That’s why the within-two-percent range is the appropriate requirement.

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