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.

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If a patient receives 2000 MRAD during a 10-minute fluoroscopy exam, how much exposure will they receive in five minutes?

500 MRAD
1000 MRAD
2000 MRAD
4000 MRAD

The correct answer is: 1000 MRAD

To determine the radiation exposure a patient would receive in five minutes based on the information provided, it is important to consider the relationship between time and radiation dose. During the original fluoroscopy exam lasting 10 minutes, the patient received a total dose of 2000 MRAD. The dose per minute can be calculated by dividing the total dose by the total time: 2000 MRAD ÷ 10 minutes = 200 MRAD per minute. If we need to find out how much exposure the patient receives in a reduced timeframe of five minutes, we can multiply the dose per minute by five: 200 MRAD/minute × 5 minutes = 1000 MRAD. Thus, the patient would receive a total exposure of 1000 MRAD during the five-minute period. This calculation demonstrates how to directly scale radiation exposure based on time, providing a clear understanding of the principles involved in dose measurement during fluoroscopy.