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
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
3
Q
Positioning Uncertainties:
internal motion - intrafractional
A
Respiratory
cardiac
changes in size and shape of organ
4
Q
techniques used to decrease mean heart dose
A
DIBH
prone RT
proton therapy
5
Q
Proton Therapy
A
lower exit dose due to the sharp dose gradient fall off
