American Society of Radiologic Technologist (ASRT) Practice Exam

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What is the voltage ripple of a high-frequency generator typically less than?

1%
12%
50%
100%

The correct answer is: 1%

High-frequency generators are used in radiography to produce consistent and high-quality images. One of the significant advantages of these generators is their ability to minimize voltage ripple, which is the variation in voltage output during the generation of X-rays. Lower voltage ripple contributes to improved image quality by providing a more stable and predictable X-ray beam. Typically, the voltage ripple of high-frequency generators is less than 1%. A ripple this low helps ensure that the X-ray output is smooth and consistent, which is essential for achieving optimal imaging results. This low ripple allows for better control over exposure parameters, thus enhancing the contrast and detail in radiographic images. In contrast, higher levels of voltage ripple—such as 12%, 50%, or 100%—would result in significant fluctuations in the X-ray output, adversely affecting the image quality and potentially leading to higher doses of radiation to patients in order to compensate for the inconsistencies. Therefore, a lower voltage ripple is critical for efficient and safe radiographic practices.