The correlation between left ventricle (LV) rotation and cardiovascular diseases, encourages the studying of regional parameters such as regional rotation in cardiac evaluation. Radial Tagged MRI (tMRI) is a promising technique for rotational motion assessment. However, a robust and reproducible method is required to quantify displacement from tMRI. Monogenic signal method and its performance on radial tMRI is investigated in this study for the first time. The proposed method, due to possibility of dense displacement vector estimation, provides an opportunity to accurately analyze the LV twist and its effect on the cardiac function. Results showed a very robust pattern for transmural changes of the rotation across the wall, calculated as -0.033 degrees per millimeter.