Measurement of liquid flows in a living organism

A method of measuring liquid flows in a living organism, comprising the steps of:

• applying an applied magnetic field to a living organism;
• introducing a quantity of a magnetizable fluid from an external source into a flow of liquid in the living organism, wherein the quantity of magnetizable fluid flowing from the external source varies as a function of time;
• measuring the variation in an induced magnetic field emanating from the living organism as a measure of the flow of the magnetizable fluid and the liquid within the living organism using at least two magnetic field sensors disposed adjacent to the body, each magnetic field sensor having an associated SQUID detector that detects the electric current flowing in its associated magnetic field sensor;
• and
• correlating the induced magnetic fields sensed by each of the magnetic field sensors to deduce the flow of the magnetizable fluid past the magnetic field sensors.