Medizinische Universität Graz - Research portal
Selected Publication:
Rauscher, A; Barth, M; Reichenbach, JR; Stollberger, R; Moser, E.
Automated unwrapping of MR phase images applied to BOLD MR-venography at 3 Tesla.
J Magn Reson Imaging. 2003; 18(2):175-180
Doi: 10.1002/jmri.10346
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- Co-authors Med Uni Graz
- Stollberger Rudolf
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- Abstract:
- PURPOSE: To improve the diagnostic value of BOLD MR-Venography by removing artifacts related to phase wrapping, particularly in regions of large background susceptibilities at high magnetic field strengths. MATERIALS AND METHODS: High resolution, T(2)(*)-weighted, single echo images were acquired on a 3 T system (Medspec 30/80 Avance, Bruker Medical, Ettlingen, Germany) with a three-dimensional, first order velocity compensated gradient echo sequence using a quadrature transmit/receive birdcage head coil. Data of nine healthy subjects and 19 patients were evaluated (age range: 27 to 76 years). To achieve improved MR-venograms, a fully automated region-growing phase unwrapping algorithm and subsequent high pass filtering were applied to phase images prior to the computation of minimum intensity projections. RESULTS: Considerably improved visualization of venous structures in regions of large background susceptibility-induced field inhomogeneities is demonstrated in healthy subjects and patients with brain tumors. CONCLUSION: BOLD MR venograms are improved compared to previous post-processing algorithms. It is now feasible to obtain high-resolution images also in inhomogeneous regions, which increases the clinical potential of BOLD MR-Venography.
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- Find related publications in this database (Keywords)
- magnetic resonance imaging
- susceptibility
- MR-venography
- BOLD
- phase-unwrapping
- 3 Tesla