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breast cancer : radiation therapy process Flashcards

(5 cards)

1
Q

Patient Positioning Difficulties
CT: APERTURE SIZE

A

-arm position - mobility post surgery and if it fits through the bore

-breast board tilt
-field of view - not encompass the whole breast

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2
Q

Possible Positioning Uncertainties:
skin marks

A

-may shift TO DEEPER TISSUE
-the thickness in set up lines may cause variations in field position
-variation of remarking if faded

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3
Q

Positioning Uncertainties:
internal motion - intrafractional

A

Respiratory
cardiac
changes in size and shape of organ

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4
Q

techniques used to decrease mean heart dose

A

DIBH
prone RT
proton therapy

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5
Q

Proton Therapy

A

lower exit dose due to the sharp dose gradient fall off

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