Abstract
Oriented elements compose fibrous structures in biological tissue, and their geometry plays an important role in organ function. In the heart, for example, myocytes are stacked end on end in a particular fashion to facilitate electrical conductivity and efficient mechanical contraction. In the brain, white matter fiber tracts are neuro-anatomically partitioned into specific bundles which connect distinct brain regions. In both cases, the local geometry has been qualitatively described as being sheet-like in particular regimes. Yet, to date, few if any quantitative methods exist for finding these sheets from imaging data. We here introduce a novel computational solution to this problem, motivated by the property that a holonomic vector field is locally normal to a family of smooth surfaces. We propose an algorithm which, given an input vector field, finds a second one with which it best spans a sheet-like structure locally, by minimizing non-holonomicity. We show that our algorithm converges in theory and in practice, under reasonable assumptions about the input data, and we provide high quality sheet reconstructions from both heart wall DTI data and labeled tracts in the human brain, along with a sheet likeliness measure. Whereas sheet-like geometries have been described qualitatively in past literature, ours is the first method to provide a reconstruction of them from a single direction field. Our algorithm also admits a parallel implementation that exploits GPUs and is hence very efficient. We thus anticipate that it will find use in the community for retrieving sheets on which oriented fibrous structures lie from imaging data.
B. Samari and T. A. Syed—Equal contribution.
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Acknowledgments
We are grateful to NSERC (Canada) and FRQNT (Québec) for funding that has supported this research.
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Samari, B., Syed, T.A., Siddiqi, K. (2019). Minimizing Non-holonomicity: Finding Sheets in Fibrous Structures. In: Chung, A., Gee, J., Yushkevich, P., Bao, S. (eds) Information Processing in Medical Imaging. IPMI 2019. Lecture Notes in Computer Science(), vol 11492. Springer, Cham. https://doi.org/10.1007/978-3-030-20351-1_14
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DOI: https://doi.org/10.1007/978-3-030-20351-1_14
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