PROBLEM TO BE SOLVED: To provide a concentration measurement device and a concentration measurement method, allowing the evaluation of the accuracy of calculation or the possibility of reverse direction blood transmission from a main vein to a head based on a phase shift between an oxygenated hemoglobin concentration and a deoxidized hemoglobin concentration.SOLUTION: A concentration measurement device includes: a probe 20 having a light incident part making measurement light incident on a head, and a photodetection part detecting the measurement light having propagated inside the head and a CPU 14 obtaining the temporal relative change amounts of an oxygenated hemoglobin concentration and a deoxidized hemoglobin concentration, and obtaining a numerical value representing a phase shift between the relative change amounts.COPYRIGHT: (C)2013,JPO&INPIT【課題】酸素化ヘモグロビン濃度と脱酸素化ヘモグロビン濃度との位相ずれに基づく、演算の正確性や大静脈から頭部への逆方向送血の可能性を評価することが可能な濃度測定装置および濃度測定方法を提供する。【解決手段】濃度測定装置は、頭部に測定光を入射する光入射部と、頭部の内部を伝搬した測定光を検出する光検出部とを有するプローブ20と、酸素化ヘモグロビン濃度及び脱酸素化ヘモグロビン濃度の時間的な相対変化量を求め、これら相対変化量の位相ずれを表す数値を求めるCPU14とを備える。【選択図】図3
