PROBLEM TO BE SOLVED: To provide a concentration measurement device and a concentration measurement method, allowing high-accuracy calculation of an oxygen saturation degree even if noise is mixed in a detection signal.SOLUTION: A concentration measurement device 1 measures the temporal relative change amounts of the total hemoglobin concentration of a head and an oxygenated hemoglobin concentration. The concentration measurement device 1 includes: a probe 20 including a light incident part making measurement light incident on the head, and a photodetection part detecting the measurement light having propagated inside the head, and generating a detection signal corresponding to the intensity of the measurement light and a CPU 14 obtaining an oxygen saturation degree from the gradient of a regression line between the temporal relative change amount of the total hemoglobin concentration and the temporal relative change amount of the oxygenated hemoglobin concentration.COPYRIGHT: (C)2013,JPO&INPIT【課題】検出信号にノイズが混入しても酸素飽和度を精度良く算出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1は、頭部の総ヘモグロビン濃度及び酸素化ヘモグロビン濃度の時間的な相対変化量を測定する。濃度測定装置1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し、該測定光の強度に応じた検出信号を生成する光検出部とを含むプローブ20と、検出信号に基づいて、総ヘモグロビン濃度の時間的な相対変化量と、酸素化ヘモグロビン濃度の時間的な相対変化量との回帰直線の傾きから酸素飽和度を求めるCPU14とを備える。【選択図】図3
