Magnetic Resonance Imaging (MRI) Board Practice Exam

For a protocol of 0.1 mmol/kg, what is the mmol dose for an 80 kg patient?

8 mmol 4 mmol 80 mmol 0.8 mmol

Correct Answer:

8 mmol

Explanation:

When a protocol is given in mmol per kilogram, you multiply the per-kilogram dose by the patient's weight to get the total mmol. For an 80 kg patient, 0.1 mmol/kg × 80 kg equals 8 mmol. So the total dose is 8 mmol. This reflects that the dose scales directly with weight: doubling weight would double the total amount at the same per-kilogram dose. If you got a different number, it would mean using a different per-kilogram dose or a different weight, not the 0.1 mmol/kg specified.

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