3. Evaluation of the 3D breast model Tumor localization by this 3D breast model is then compared to the localization by ROLL. The intraoperative 3D optical scan gives us the tumor localization obtained by radioguided occult lesion localization thanks to pen marking left by the surgeon. The novel technique gives us a 3D model and the localization of the tumor visible by transparency. Comparison is done by superimposing both acquisitions.