2375160 MTRasym magnetization transfer ratio asymmetry 74 2375161 MTRasym magnetic resonance ratio asymmetry 2 2375162 MTRasym magnetization transfer ratio with asymmetric analysis 2 2375163 MTRasym maps with asymmetric analysis 1 2375165 MTRasym MRI is often calculated using the asymmetry analysis 1 2375166 MTRasym MRI quantification remains challenging because routine asymmetry analysis 1 2375167 MTRasym MT ratio asymmetry 1 2375168 MTRasym MTR asymmetric analysis 1 2375164 MTRasym MTR asymmetry 1