MR neurography of the median nerve at 3.0T: optimization of diffusion tensor imaging and fiber tractography
| Autor: | Daniel Nanz, Klaas P. Pruessmann, Daniel Markovic, Avneesh Chhabra, Roman Guggenberger, Gustav Andreisek, Patrick Eppenberger |
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| Přispěvatelé: | University of Zurich, Guggenberger, Roman |
| Rok vydání: | 2012 |
| Předmět: |
Adult
Male medicine.medical_specialty Fiber tract 610 Medicine & health Nerve Fibers Myelinated 170 Ethics Fractional anisotropy Healthy volunteers Neural Pathways Medicine 2741 Radiology Nuclear Medicine and Imaging Humans Radiology Nuclear Medicine and imaging 10237 Institute of Biomedical Engineering Prospective Studies Aged business.industry 10042 Clinic for Diagnostic and Interventional Radiology Echo-Planar Imaging Magnetic resonance neurography Fiber tractography Mean age General Medicine Middle Aged Median nerve Surgery Median Nerve Cross-Sectional Studies Diffusion Tensor Imaging Anisotropy Female Nuclear medicine business Algorithms Diffusion MRI |
| Zdroj: | European journal of radiology. 81(7) |
| ISSN: | 1872-7727 |
| Popis: | The purpose of this study was to systematically assess the optimal b-value and reconstruction parameters for DTI and fiber tractography of the median nerve at 3.0T.Local ethical board approved study with 45 healthy volunteers (15 men, 30 women; mean age, 41 ± 3.4 years) who underwent DTI of the right wrist at 3.0T. A single-shot echo-planar-imaging sequence (TR/TE 10123/40 ms) was acquired at four different b-values (800, 1000, 1200, and 1400 s/mm(2)). Two independent readers performed post processing and fiber-tractography. Fractional anisotropy (FA) maps were calculated. Fiber tracts of the median nerve were generated using four different algorithms containing different FA thresholds and different angulation tolerances. Data were evaluated quantitatively and qualitatively.Tracking algorithms using a minimum FA threshold of 0.2 and a maximum angulation of 10° were significantly better than other algorithms. Fiber tractography generated significantly longer fibers in DTI acquisitions with higher b-values (1200 and 1400 s/mm(2) versus 800 s/mm(2); p0.001). The overall quality of fiber tractography was best at a b-value of 1200 s/mm(2) (p0.001).In conclusion, our results indicate use of b-values between 1000 and 1400 s/mm(2) for DTI of the median nerve at 3.0T. Optimal reconstruction parameters for fiber tractography should encompass a minimum FA threshold of 0.2 and a maximum angulation tolerance of 10. |
| Databáze: | OpenAIRE |
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