Lange Mammography Practice Exam

If the backup time stops a breast exposure, the technologist can repeat the radiograph using what adjustment?

Higher peak KVP setting Increase mA Longer exposure time Increase filtration

Correct Answer:

Higher peak KVP setting

Explanation:

The backup timer stops an exposure after a preset time, so if the exposure would exceed that limit you need to deliver the needed receptor exposure in less time. Raising the peak kVp increases beam energy and the dose delivered to the detector per unit time, allowing the same image quality to be achieved with a shorter on-time. That shortens the exposure enough to finish before the timer cuts off. Be mindful that higher kVp can reduce image contrast, but it’s the effective way to prevent a reset or repeat due to the timer. Other options either reduce beam intensity, extend exposure time, or increase dose without addressing the timer trigger.

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