Target Volume Determination 2015

Per-treatment parotid gland volume changes

Parotid gland volume changes during radiotherapy

Reference

Radiotherapy technique

Per-treatment imaging time

Δ pretreatment volume/ per-treatment volume

Barker 2004

2DRT/3DCRT/IMRT

3/week

-0.6%/day

Nishimura 2006

IMRT

Week 3-4

-25%

Ipsilateral: -0.9%/day Contralateral: -1%/day

Castadot 2010

IMRT

Week 2,3,4,5

Ahn 2010

IMRT

Week 3

-24%

GTV

GTV

CTV

CTV

PTV

PTV

Barker et al. IJROBP 2004;59:960-70. Nishimura et al. IJROBP 2006;64:355-62. Castadot et al. Radiother Oncol 2010;95:209-17. Ahn et al. IJROBP 2010;80:677-85.