Résumé : Current intraoperative margin assessment techniques lack the accuracy needed for clinical practice. Indocyanine green fluorescence imaging (ICG-FI) offers a useful technique for detection of tumoral tissue, including breast cancer (BC). There is a great inconsistency in the literature regarding the use of ICG for BC fluorescence imaging mainly concerning ICG dosing and the timing of administration. This study aims to determine the dose and timing of intravenous (IV) ICG administration that provides the optimal diagnostic accuracy for ICG-FI margin assessment during breast-conserving surgery (BCS).