TY - JOUR AU - Perez, Juan J. PY - 2014 DA - 2014/09/06 TI - To what extent is the bipolar rheoencephalographic signal contaminated by scalp blood flow? A clinical study to quantify its extra and non-extracranial components JO - BioMedical Engineering OnLine SP - 131 VL - 13 IS - 1 AB - Impedance plethysmography applied to the head by using a pair of electrodes attached to the scalp surface is known as bipolar Rheoencephalography or REG I and was originally proposed to measure changes in cerebral blood volume related to the heartbeat. REG I was soon discarded in favor of other REG configurations, since most of the signal was shown to be heavily contaminated by the extracranial blood flow. The main goal of this study was to identify and compare the part of the REG I signal caused by scalp blood flow with that originating from non-extracranial sources. SN - 1475-925X UR - https://doi.org/10.1186/1475-925X-13-131 DO - 10.1186/1475-925X-13-131 ID - Perez2014 ER -