Which statement best describes the purpose of Couinaud segment boundaries in imaging and surgery?

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Functional segmentation of the liver provides a precise map for locating disease and guiding treatment. The boundaries defined by Couinaud correspond to planes where portal inflow and hepatic venous drainage separate the liver into eight functionally independent segments. Because each segment has its own vascular and biliary supply, imaging can map a lesion to a specific segment, and surgeons can plan segmental resections that remove the pathology while preserving as much healthy liver as possible. This makes the main purpose of these boundaries to help locate pathology and direct targeted interventions.