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29. A patient is to be treated with parallel opposed fields that are weighted 2:1 Anterior to Posterior. The prescription dos
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Answer #1

If a dose DRx is prescribed through multiple fields each having a relative weight wti, then the dose Di from each field is given by the following equation

D_{i} = D_{Rx}(\frac{Wt_{i}}{\sum_{i}wt})

In our case Total weight wt-2+1-3

DRx = 200 cGy

So, Dose from anterior = 200 ×ニー133.33cGy

Dose from posterior = 3 200 ×-= 66 .67cGu

Approximate answer will be (B) otherwise none of the the above is correct.

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