This paper presents a system for correcting ECG signals perturbed by MRI environments. The proposed system is based on a dedicated ASIC for measuring with high resolution the MRI magnetic gradients, which are the cause of the ECG artifacts. The measured data are used to calculate the coefficients of an integration compliant adaptive LMS filter. The filter removes the artifacts from the perturbed ECG. The filter has been implemented together with a QRS complex detection algorithm on an FPGA target. The promising experimental results validate the principle and open new perspectives in terms of ASIC integration of the whole system.