American Registry of Radiologic Technologists (ARRT) Practice Exam

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Prepare for the American Registry of Radiologic Technologists Test with engaging quizzes and detailed explanations. Boost your test readiness with multiple-choice questions designed to enhance your knowledge and confidence.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Which grid ratio requires the most significant increase in mAs when performing radiographic procedures?

5:1
8:1
12:1
16:1

The correct answer is: 16:1

The grid ratio that requires the most significant increase in milliampere-seconds (mAs) when performing radiographic procedures is the 16:1 ratio. As the grid ratio increases, the amount of scatter radiation that is removed from the primary beam also increases. A higher grid ratio, such as 16:1, is more effective at filtering out scatter radiation, but it also requires a greater increase in exposure (mAs) to compensate for the reduction in the amount of primary radiation that reaches the image receptor. Consequently, using a grid with a higher ratio means that the patient is exposed to a greater amount of radiation, therefore requiring technologists to adjust their techniques accordingly. The other grid ratios, while also requiring increases in mAs compared to using no grid at all, do not necessitate as significant an increase as the 16:1 ratio. For example, the 5:1 grid would require the least amount of mAs adjustment, while moving to higher ratios like 8:1 and 12:1 would progressively demand more mAs, yet not to the extent of a 16:1 grid. This concept is crucial in radiography to ensure image quality while minimizing patient exposure to unnecessary radiation.