Exam (elaborations)
Rad 370 Skin and melanoma- Questions & Answers
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Rad 370 Skin and melanoma- Questions & Answers
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Rad 370 Skin and melanoma- Questions& Answers
What are the 2 ways external beam treatment can be given for skin and melanoma? Correct
Ans-Electron and photon production
What size of cones are used for superficial and orthovoltage treatment? Correct Ans-1-13cm
What distance do you place electron cutouts for superficial and orthovoltage? Correct Ans-5-
20 cm away from the patient
What are electron cutouts made out of? Correct Ans-Cerroband
What are the cutouts made out of for photons? Correct Ans-lead
Where are the cutouts placed for photons? Correct Ans-directly on the skin
Why are interchangeable filters needed Correct Ans-to harden the beam
What distance are interchangeable filters placed for photon production? Correct Ans-13-50
ssd
What distance are scattering filters placed for electron production? Correct Ans-100-115 SSD
Do you want to use higher of lower ssds for interchangeable filters? Correct Ans-lower to
reduce penumbra
, what are scattering foils used for on linear accelerators? Correct Ans-They spread-out the
beam
What is the radiation field for Skin and melanoma? Correct Ans-1.5-2 cm margins, completely
encompassing lesion to cover microscopic disease
What is an advantage of a lead shield? Correct Ans-They can be customized
T/F using wet gauze as a bolus is very effective Correct Ans-False, in order for it to be
effective the gauze would have to be soaking wet which is never is
What dose in the inner ear kept under? Correct Ans-1000 cGy,
Do you want to maximize of minimize the surface dose of the ear? Correct Ans-maximize
When treating the lips, what is used to reduce dose to the gums and lips? Correct Ans-a lead
sheid covered in wax
When treating the nose what is used to save the septum? Correct Ans-lead strips covered in
wax up the nostrils
What is out in the nose if the treatment is not too deep? Correct Ans-just wax
Where can a shield be placed to protect the eye? Correct Ans-in-between the eye and eyelid
or a larger shield over the whole eye
What dose can cause cataracts? Correct Ans-a single dose of 200cGy
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