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Rad 370 Skin and melanoma Exam with Questions and Answers| Latest Update
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Rad 370 Skin and melanoma Exam with Questions and Answers| Latest Update
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Rad 370 Skin and melanoma Exam with Questionsand Answers| Latest Update
How is Radiation Therapy treatment used for non-melanomas? - ✔✔- For non-melanomas it
is very effective especially for small tumors, works well on extensive disease, where disease is
deeper and lymph nodes are involved
- most non-melanomas are superficial in treatment
- can use kV photons, MV used for deeper tumors
What are things to consider when deciding between electrons and KV x-rays - ✔✔- size of
treatment volume
- depth of lesion
- underlying anatomic structures
- physician preference
- availability of equipment
What to consider for Field size? - ✔✔- with kv the size doesn't matter however, w/a small
field size with electrons we will lose energy since the field is small
What to consider for depth of max dose? - ✔✔the surface dose less than 90-95% is
unacceptable for skin cancers, with low energy KV the Dmax hits the skin. electrons the higher
the energy = higher surface dose, decrease energy = decrease surface dose
What to consider for deep tissue dose? - ✔✔- electrons deep tissue dose goes down rapidly,
while photons keep traveling they penetrate much deeper
what to consider for differential bone absorption? - ✔✔- electrons give overall dose to bone
and tissue with 100 KV the bones gets more absorbed dose, so it may not treat the needed
area. 1 cm bone = 1.65 cm tissue, 1 cm lung tissue = .25 cm tissue
, What to consider for Cosmesis and cortal rates? - ✔✔- excellent and good cosmesis in 95%
of patients treated with photons, 80% in electrons. if bolus is used cosmesis is worse, and much
better in 50% or less is delivered with a bolus
What gives the sharpest beam edge? - ✔✔lead on the skin and photons
What gives the worst beam edge in small field sizes? - ✔✔smaller high dose region
w/electrons makes it worse in small field size
What does E/2 equal? - ✔✔E/2 equals the energy you are using over 2 and tell us the
practical ranges
What is E/2, E/2.5, E/3, E/4? - ✔✔- E/2 = d10%
-E/2.5 = d50%
- E/3 = d80%
- E/4 = d90%
How do linear accelerators and kv production focus the beam? - ✔✔Cones
What is the size range for the cones used to focus the beams? - ✔✔4x4-25x25
What are the 2 ways external beam treatment can be given for skin and melanoma? -
✔✔Electron and photon production
What size of cones are used for superficial and orthovoltage treatment? - ✔✔1-13cm
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