A Study on Blood Flow Changes by Near Infrared Spectroscopy at Organ Surfaces for a Human Health Index

近红外光谱技术目前已被应用于检测毛细血管网络的脑血流变化。我们发现这种方法适用于检测人体四肢或躯干较大的血流变化。在本研究中，我们安全、连续地测量了门静脉血流的变化。我们能够定性地检测门静脉血流变化，但不能定量地检测。即使有这样的限制，预计血流量的变化反映了肠道的消化功能，可能有助于检查受试者的一般情况，并为早期检查提供动力。在我们的研究中使用的这个装置的设备价格便宜，因此，它可能适合家庭使用。

Near infra-red spectroscopy is presently applied to detect cerebral blood flow changes of the capillary network. We have found that this method is applicable to detect larger blood flow changes at the extremities or the trunk in a human body. In this study, we measured portal vein blood flow change safely and continuously.We were able to detect portal vein blood flow changes qualitatively but not quantitatively. Even with this limitation, it is expected that blood flow change reflects digestive function of the intestines and may help examine the general condition of a subject and provide the impetus for an early checkup. The equipment with this device used in our study is inexpensive, therefore, it may be suitable for home-use.