A Patient Is Treated on a 6-MV Machine at 100

question 5

Multiple Choice

A patient is treated on a 6-MV machine at 100 cm SSD.The collimator setting is 15 x 15.There is no blocking used for this treatment.The prescription states that a dose of 3000 cGy is to be delivered to a depth of 3 cm in 10 fractions using a posterior treatment field using the nonisocentric method of calculation.The patient central axis separation is 20 cm.What is the MU setting for the treatment? Reference dose rate (RDR) for a 15 cm equivalent square is 0.993 cGy/MU.

• A) 315
• B) 321
• C) 319
• D) 317

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Definitions:

Intersexed

Pertaining to individuals born with physical sex characteristics that do not fit typical binary notions of male or female bodies.

Great Spirit

A concept in some indigenous beliefs of North America, referring to an all-encompassing, powerful, spiritual force or supreme being.

Mother Earth

A common personification of nature that focuses on the life-giving and nurturing aspects of nature by embodying it in the form of the mother.

Intersexed

An umbrella term for individuals whose anatomy or genes differ from typical definitions of male or female at birth.