Andreas Lemke1, Frederik Bernd Laun2, Dirk Simon3, Bram Stieltjes4, Lothar Rudi Schad1
1Department of Computer Assisted Clinical Medicine, Heidelberg University, Mannheim, Germany; 2Department of Medical Physics in Radiology, German Cancer Research Center, Heidelberg, Germany; 3Software Development for Integrated Diagnostics and Therapy, German Cancer Research Center, Heidelberg; 4Department of Radiology, German Cancer Research Center, Heidelberg, Germany
The DWI signal was measured as a function of the b-value in the pancreas using three different echo times (TE=50, 70, 100 ms) from six healthy volunteers. A modified equation incorporating relaxation effects was introduced and parameters derived from this equation were compared to the original IVIM equation. The perfusion fraction f increased significantly with increasing echo time (P=0.0025) whereas the relaxation time compensated perfusion fraction f' showed no significant dependence on TE (P=0.31). The relaxation time compensation had no influence on the diffusion coefficients.