ATP Barcelona 2017

What have we learned after >10 years searching the holy grail for PET based GTV-segmentation? • Using molecular imaging for GTV delineation at all is more important than finding the right method to include the last voxel • Maybe drawing one line is not what resembles the information needed for future RT planning • If we need one line, visual delineation is not a bad idea, institutional standardisation makes sense • Automatic delineation (by something else than simple thresholding) speeds up the contouring process but should be used as a starting point for user review • The use 4D imaging for TVD will not be possible without automation

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