K‐ <scp>CC</scp> ‐ <scp>MoCo</scp> : A Fast <i>k</i> ‐Space‐Based Respiratory Motion Correction for Highly Accelerated First‐Pass Perfusion Cardiovascular <scp>MR</scp>

K-CC-MoCo outperforms image-based correction in free-breathing FPP-CMR acquisitions accelerated up to 50×. Respiratory motion is estimated and corrected in k-space, enabling its use for model-based and/or deep learning reconstructions from highly accelerated scans.