Regional Blood Flow in the Cerebral Cortex, Measured Simultaneously by Heat and Inert Gas Clearance

Regional blood flow of the cerebral cortex was measured simultaneously with two methods, one being a modification of the discontinuous 85 Krypton clearance method, the other a continuous heat‐clearance method. A correlation could be established between the regional cortical blood flow values obtained with the two methods. It is concluded that the heat‐clearance method can be calibrated by the 85 Krypton method, and that, hence, a combined use of the two methods may be helpful for a quantitative analysis of rapid and transient changes in regional cortical blood flow.