Dieter Klatt1,
Detlef Stiller2, Thomas Kaulisch2, Heiko Nieen2,
Kerstin Riek1, Sebastian Papazoglou1, Thomas Elgeti1,
Ingolf Sack1, Jrgen Braun3
1Institute of Radiology, Charit -
University Medicine Berlin, Berlin, Germany; 2Boehringer Ingelheim
Pharma GmbH & Co. KG, Biberach, Germany; 3Institute of Medical
Informatics, Charit - University Medicine Berlin, Berlin, Germany
MR
elastography (MRE) enables the measurement of the complex shear modulus G* of
biological tissue. Using MRE, the frequency dependency of G* has been
examined in the past within a limited dynamic range due to inherent technical
restrictions. In this study, G* of liver in a wide dynamic range of more than
4.5 octaves was measured by combining MRE at a 1.5T human scanner system with
MRE at a 7T animal scanner. The results of both systems agreed excellently
and revealed a power-law behavior of G* between 25Hz and 600Hz vibration
frequency. The springpot-model was used for calculating viscoelastic
parameters.
Keywords