Research Papers

Diffusion-Tensor Imaging Versus Digitization in Reconstructing the Masseter Architecture

[+] Author and Article Information
Cristina Falcinelli

Orthopaedic Biomechanics Laboratory,
Sunnybrook Research Institute,
2075 Bayview Avenue,
Toronto, ON M4N 3M5, Canada
e-mails: cristina.falcinelli@sunnybrook.ca; c.falcinelli@unicampus.it

Zhi Li

Musculoskeletal Anatomy Laboratory,
Division of Anatomy,
Faculty of Medicine,
University of Toronto,
1 King's College Circle, Room 1158,
Toronto, ON M5S 1A8, Canada
e-mail: jameszhi.li@mail.utoronto.ca

Wilfred W. Lam

Physical Sciences,
Sunnybrook Research Institute,
Room S6 05 2075 Bayview Avenue,
Toronto, ON M4N 3M5, Canada
e-mail: lamw@sri.utoronto.ca

Greg J. Stanisz

Physical Sciences,
Sunnybrook Research Institute,
Room S6 72 2075 Bayview Avenue,
Toronto, ON M4N 3M5, Canada
e-mail: stanisz@sri.utoronto.ca

Anne M. Agur

Musculoskeletal Anatomy Laboratory,
Division of Anatomy,
Faculty of Medicine,
University of Toronto,
1 King's College Circle, Room 1158,
Toronto, ON M5S 1A8, Canada
e-mail: anne.agur@utoronto.ca

Cari M. Whyne

Orthopaedic Biomechanics Laboratory,
Sunnybrook Research Institute,
Room S6 20 2075 Bayview Avenue,
Toronto, ON M4N 3M5, Canada
e-mail: cwhyne@sri.utoronto.ca

1Present address: Department of Engineering, Campus Bio-Medico University of Rome, Via Alvaro del Portillo 21, Rome 00128, Italy.

Manuscript received January 9, 2018; final manuscript received September 19, 2018; published online October 4, 2018. Assoc. Editor: Anna Pandolfi.

J Biomech Eng 140(11), 111010 (Oct 04, 2018) (6 pages) Paper No: BIO-18-1014; doi: 10.1115/1.4041541 History: Received January 09, 2018; Revised September 19, 2018

Accurate characterization of the craniomaxillofacial (CMF) skeleton using finite element (FE) modeling requires representation of complex geometries, heterogeneous material distributions, and physiological loading. Musculature in CMF FE models are often modeled with simple link elements that do not account for fiber bundles (FBs) and their differential activation. Magnetic resonance (MR) diffusion-tensor imaging (DTI) enables reconstruction of the three-dimensional (3D) FB arrangement within a muscle. However, 3D quantitative validation of DTI-generated FBs is limited. This study compares 3D FB arrangement in terms of pennation angle (PA) and fiber bundle length (FBL) generated through DTI in a human masseter to manual digitization. CT, MR-proton density, and MR-DTI images were acquired from a single cadaveric specimen. Bone and masseter surfaces were reconstructed from CT and MR-proton density images, respectively. PA and FBL were estimated from FBs reconstructed from MR-DTI images using a streamline tracking (STT) algorithm (n = 193) and FBs identified through manual digitization (n = 181) and compared using the Mann–Whitney test. DTI-derived PAs did not differ from the digitized data (p = 0.411), suggesting that MR-DTI can be used to simulate FB orientation and the directionality of transmitted forces. Conversely, a significant difference was observed in FBL (p < 0.01) which may have resulted due to the tractography stopping criterion leading to early tract termination and greater length variability. Overall, this study demonstrated that DTI can yield muscle FB orientation data suitable to representative directionality of physiologic muscle loading in patient-specific CMF FE modeling.

Copyright © 2018 by ASME
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Grahic Jump Location
Fig. 1

The image processing procedure: (i) registration of different imaging modalities; (ii) segmentation of the CT scan to reconstruct the craniofacial bone surface; (iii) segmentation of the MR structural image volume to extract the boundaries of the masseter; and (iv) FB pathways reconstructed through the DTI-based STT algorithm

Grahic Jump Location
Fig. 2

Manual digitization of the masseter FBs. The muscle specimen (on the left) and the FBs reconstructed through the digitization (on the right) are shown.



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