Michael Bach1, Bram Stieltjes2,
Klaus Fritzsche3, Wolfhard Semmler1, Frederik Bernd
Laun1
1Medical Physics in
Radiology, German Cancer Research Center, Heidelberg, Germany; 2Quantitative
Imaging-based Disease Characterization, German Cancer Research Center,
Heidelberg, Germany; 3Medical Imaging & Biological
Informatics, German Cancer Research Center, Heidelberg, Germany
Recently, several different diffusion phantoms have been proposed but a dedicated resolution phantom is lacking. Here we present a circular phantom consisting of four 2mm wide tracts separated by a 2 mm space. The phantom was measured at isotropic resolutions of 2x2x2 mm3 and 3x3x3 mm3. A high FA of 0.7 was obtained. Fiber tracking clearly shows a resolution effect; at 2x2x2 mm3, the individual bundles can be separated whereas at 3x3x3 mm3, no separation can be obtained. The presented resolution phantom may be used to investigate various parameters influencing the obtainable effective resolution of the used DTI-sequence and post-processing.