Mean kurtosis (MK) obtained from the kurtosis tensor is often associated with acquisition protocols that may be long for clinical demands. Apparent kurtosis (Kapp), obtained from the direct fit of the signal to an exponential decay, is faster to acquire and may provide with similar information. Directional averaging is required to preserve spherical invariance; however, in clinical applications the trace of diffusion tensor measured with 3 directions is often used as tissue marker with good results. In this study we investigate Kapp derived from trace data in forty brain tumour patients and compare it to mean kurtosis. Kapp was found to be underestimated but the two metrics show a significantly high degree of correlation.
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