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