Comparison of models of diffusion in Wilms ’ tumours and normal contralateral renal tissue

This study aimed to compare the suitability of four diffusion models (mono exponential, IVIM [Intravoxel Incoherent Motion], stretched exponential, and kurtosis) in Wilms’ tumours and the unaffected contralateral kidneys.Materials and methodsDWI data were retrospectively reviewed(110 Wilms ’ tumours and 75 normal kidney datasets). The goodness of fit for each model was measured voxel-wise using Akaike Information Criteria (AIC). Mean AIC was calculated for each tumour volume (or contralateral normal kidney tissue). One-way ANOVAs with Greenhouse–Geisser correction and post hoc tes ts using the Bonferroni correction evaluated significant differences between AIC values; the lowest AIC indicating the optimum model.ResultsIVIM and stretched exponential provided the best fits to the Wilms ’ tumour DWI data. IVIM provided the best fit for the normal kidney data. Mono exponential was the least appropriate fitting method for both Wilms’ tumour and normal kidney data.DiscussionThe diffusion weighted signal in Wilms ’ tumours and normal kidney tissue does not exhibit a mono-exponential decay and is better described by non-Gaussian models of diffusion.
Source: Magnetic Resonance Materials in Physics, Biology and Medicine - Category: Materials Science Source Type: research