A Patient Is Being Treated on the 6-MV Beam to an Opposed

question 35

Multiple Choice

A patient is being treated on the 6-MV beam to an opposed lateral whole brain (midline) .The collimator setting is 14 × 18 with no blocks.The dose is 4000 cGy/20 fractions.The separation is 22 cm.What is the dose delivered to Dmax?

• A) 200 cGy
• B) 212 cGy
• C) 150 cGy
• D) 61.9 cGy

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