An MR process locates a medical instrument with an attached microcoil in the examination volume of an MR device. The microcoil is part of a resonant circuit matched to the resonant frequency of the MR device and having no external controls. At least two temporally successive high frequency pulses (RF) are generated within the examination volume. After each of the high frequency pulses (RF), frequency-coded MR signals (S1, S2) from the examination volume are recorded. The position of the medical instrument is determined by analyzing the differences between the recorded MR signals (S1, S2).
