Abstract: An information processing apparatus includes: a memory that stores a predetermined instruction command, and stores an image showing a blood vessel of a biological tissue imaged by a probe; and a processor configured to execute the instruction command stored in the memory, to generate an index indicating the state of blood in the blood vessel at one or more coordinate positions in the image, and output each generated index associated with each corresponding coordinate position.

Abstract: A process and an apparatus for measuring the biocurrent distribution call for initially assuming a number of multiple currents which is more than the number of isolated currents possibly existing in a living body and calculating the virtual magnetic field created by the assumed currents at actual measuring points. The estimated location and current vectors of said assumed currents are consecutively changed to decrease the difference between said virtual and actual magnetic fields so that the estimated location and current vectors of the assumed currents having the number corresponding to the true isolated currents substantially approximate the true values and the estimates of the other assumed currents approximate zero. This enables the biocurrent distribution to be exactly determined even when the number of isolated currents is not preliminarily known.