PT Unknown AU Jaume Garcia Joel Barajas Francesc Carreras Sandra Pujades Petia Radeva TI An intuitive validation technique to compare local versus global tagged MRI analysis BT Computers In Cardiology PY 2005 BP 29–32 VL 32 DI 10.1109/CIC.2005.1588025 AB Myocardium appears as a uniform tissue that seen in convectional Magnetic Resonance Images (MRI) shows just the contractile part of its movement. MR Tagging is a unique imaging technique that prints a grid over the tissue which moves according to the underlying movement of the myocardium revealing the true deformation of the cardiac muscle. Optical flow techniques based on spectral information estimate tissue displacement by analyzing information encoded in the phase maps which can be obtained using, local (Gabor) and global (HARP) methods. In this paper we compare both in synthetic and real Tagged MR sequences. We conclude that local method is slightly more accurate than the global one. On the other hand, global method is more efficient as it is much faster and less parameters have to be taken into account ER