DANB Radiology Practice Exam 2025 – The All-In-One Guide to Mastering Your Certification!

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What does a lower kVp setting typically result in regarding the x-ray beam?

Longer wavelengths and increased energy

Shorter wavelengths and increased energy

Longer wavelengths and decreased energy

A lower kVp setting in an x-ray machine results in the production of longer wavelengths and decreased energy for the x-ray beam.

In radiography, kilovolt peak (kVp) determines the quality of the x-ray beam, particularly its penetrating ability. A lower kVp means that the x-rays produced have less energy or penetrating power, which is reflected in longer wavelengths. This is fundamental in understanding x-ray physics, as lower energy and longer wavelengths are less effective in penetrating dense structures like bone. They tend to be absorbed more by the tissues, leading to a higher contrast image for softer tissues but potentially inadequate penetration for harder structures.

Thus, the outcomes associated with a lower kVp setting provide essential insight into the behavior of the x-ray beam and its interaction with matter, which is a crucial concept in radiology and imaging practices.

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Shorter wavelengths and decreased energy

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