A Patient Is Being Treated on the 18-MV Beam to an AP/PA

question 30

Multiple Choice

A patient is being treated on the 18-MV beam to an AP/PA stomach (midline) .The collimator setting is 12 × 12 with no blocks.The dose is 4400 cGy/22 fractions.The separation is 24 cm.The cord is 4 cm from the PA.What dose is delivered to the spinal cord?

• A) 206.4 cGy
• B) 180 cGy
• C) 220 cGy
• D) 133.7 cGy

---

Definitions:

Proximodistal

From the inner part (or axis) of the body outward.

Cephalocaudal

From head to tail.

Proximodistal

Refers to a pattern of development where growth starts at the center of the body and moves towards the extremities.

Differentiation

The process through which entities become more specialized and distinct from one another in terms of characteristics or functions.