Diffusion Measurements - DWI
The following diffusions measurements were aquired using a DWI sequence referring to the following two publications:
Sequences for Diffusion MRI
Jim Pipe, Ph.D., St. Joseph’s Hospital, Phoenix, Arizona, USA
https://afni.nimh.nih.gov/sscc/staff/rwcox/ISMRM_2006/Syllabus%202006%20-%203340/files/E_04.pdf
The Stejskal–Tanner equation generalized for any gradient shape - an overview of most pulse sequences measuring free diffusion
Davy Sinnaeve - Department of Organic Chemistry, Ghent University, Belgium
http://onlinelibrary.wiley.com/doi/10.1002/cmr.a.21223/abstract
The figure below shows the used sequence programmed in the openMATLAB interface. The DWI sequence can be configured to use multiple diffusion and imaging modules in 0D / 1D and 2D.
As a demonstration we measured the ADC values of a selection of oils: rapeseed oil, olive oil and sewing machine oil. This is shown in the left figure.
The ADC values of a combined sample of ethanol and water is shown in the right figure.
DWI results - Rapeseed oil, olive oil, sewing machine oil | DWI results - Water, Ethanol |