2970-2971 / 3107
Options for matching shoulder/chest wall/breast fields
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Calculated angles for couch, gantry and collimator to
keep match plane at junction
–
(time-consuming if change length)
•
Half beam with single isocentre
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(easy set up and good match)
•
Junction by eye – combination of collimator, gantry
and couch angles to match
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(subject to day to day variation)
•
Leave gap
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(risk of under dosage)