Radial wall motion mapping with CMR. The phase of inward radial wall motion is represented by colours ranging from blue (zero phase shift: inward motion during global systole), to green (90° phase shift: inward motion at the end of global systole) and to red (180° phase shift: inward motion during global diastole). Accordingly, the bull's eye with a homogenous blue colour throughout denotes complete synchrony, whereas a bull's eye with a homogenous red colour throughout denotes complete synchrony. Heterogenouss colour coding denotes dyssynchrony of radial motion, with blue representing early (global systolic phase) activation and red representing late (global diastolic phase) inward radial wall motion. Note the patchy distribution of wall motion throughout the LV. Reproduced with permission from Foley P, et al.