Cover Imaging for Physicists

Gradient-based segmentation improves

target volume definition in NSCLC

Wanet M et al. Radiother

Oncol 2011;98:117-25.

• N=10 NSCLC patients

• GTV delineation on

CT±PET

• Comparison with surgical

specimen

• PET yields more robust

delineation in poorly

defined tumors

• Gradient based seg.

outper-formed threshold

method in terms of

accuracy and robustness

ESTRO Teaching Course Advanced Imaging: PET – Reconstruction, Contouring