In a method and a device, complex image data (61, 63, 71, 73) of an examination subject, the at least two different spin - species, processed. In this case, at least one mr - parameters, which in the case of an mr - acquiring data acquired data is influenced, is determined in a spatially resolved manner. With each of a plurality of gathering units are in the case of an mr - data acquisition in the case of a plurality of echo times in each case complex image data (61, 63, 71, 73) detected in such a way that a phase difference between the first spin - species and the second spin - species in the case of at least two of the echo times is different. For a plurality of pixels (64, 66, 74, 76; 67, 68, 77, 78), a value of the at least one mr - parameter determined in such a way that a function from the at least one mr - parameters and the corresponding pixel (64, 66, 74, 76; 67, 68, 77, 78) in the complex image data (61, 63, 71, 73), a condition is satisfied with.
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