Gynae BT 2017
Intro
Mission
Concept
Solution
Practice
Example EBRT + PDR -BT for cervical carcinoma
a/b = 10 Gy for cervical tumour a/b = 3 Gy for OAR (bladder, rectum, sigmoid) T1/2 = 1.5 h for cervical tumour and OAR BT treatment time: 80h (PDR: pulse time = 15 min, interval = 1 h) D90 HR-CTV physical dose EQD2 External beam 25 x 1.8 Gy = 45 Gy 44 Gy ab10 BT 0.5Gy/h 80 x 0.5 Gy = 40 Gy 40 Gy ab10 Total dose 85Gy 84 Gy ab10 ( ) ( )
HDR
=
84 Gy
10
OAR brachy dose to OAR D2cc External beam 25 x 1.8 Gy =
45 Gy ( ) ( )
43 Gy
HDR
ab3
BT 0.35Gy/h 80 x 0.35 Gy = 28 Gy
31 Gy
ab3
<
74 Gy
Total dose
73 Gy
68 Gy
3
ab3
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