Magnetic field anisotropy based MR tractography
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- Magnetic field anisotropy based MR tractography
- Han, S. H.; Song, Y. K.; Cho, F. H.; Ryu, S.; Cho, G.; Song, Y. -Q.; Cho, Hyungjoon
- Anisotropic structure; Capillary model; Diffusion anisotropy; External magnetic field; Fiber materials; Fiber structures; Interference patterns; Internal gradient; Magnetic field strengths; MR tractography; Noninvasive measurements; Structural orientations; Tractography; Vessel orientation imaging; Water diffusion
- Issue Date
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- JOURNAL OF MAGNETIC RESONANCE, v.212, no.2, pp.386 - 393
- Non-invasive measurements of structural orientation provide unique information regarding the connectivity and functionality of fiber materials. In the present study, we use a capillary model to demonstrate that the direction of fiber structure can be obtained from susceptibility-induced magnetic field anisotropy. The interference pattern between internal and external magnetic field gradients carries the signature of the underlying anisotropic structure and can be measured by MRI-based water diffusion measurements. Through both numerical simulation and experiments, we found that this technique can determine the capillary orientation within 3. Therefore, susceptibility-induced magnetic field anisotropy may be useful for an alternative tractography method when diffusion anisotropy is small at higher magnetic field strength without the need to rotate the subject inside the scanner.
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