The boat that now arrived, assured by the answering signal that all was well, soon came in sight, white and silent as a phantom, and cast anchor within a cable's length of shore.

The method adjusts time constant and gain of compensation-circuits with determining change of magnetic resonance signal of phantom.

Based on physical phantom after 100 times data iteration, the measurement accuracy of this system for small and large signal is 1.0% and 0.1%.