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A Method for Accurate Reconstructions of the Upper Airway Using Magnetic Resonance Images.

Xiong H, Huang X, Li Y, Li J, Xian J, Huang Y - PLoS ONE (2015)

Bottom Line: Finally, the three-dimensional (3D) NURBS (Non-Uniform Rational B-Splines) surface of the UA was constructed using the registered boundaries in all three different planes.A smooth 3D structure of the UA was constructed, which captured the anatomical features from the three anatomical planes, particularly the location of the anterior wall of the nasopharynx.The volume and area of every cross section of the UA can be calculated from the constructed 3D model of UA.

View Article: PubMed Central - PubMed

Affiliation: School of Biomedical Engineering, Capital Medical University, Beijing, China; Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing, China.

ABSTRACT

Objective: The purpose of this study is to provide an optimized method to reconstruct the structure of the upper airway (UA) based on magnetic resonance imaging (MRI) that can faithfully show the anatomical structure with a smooth surface without artificial modifications.

Methods: MRI was performed on the head and neck of a healthy young male participant in the axial, coronal and sagittal planes to acquire images of the UA. The level set method was used to segment the boundary of the UA. The boundaries in the three scanning planes were registered according to the positions of crossing points and anatomical characteristics using a Matlab program. Finally, the three-dimensional (3D) NURBS (Non-Uniform Rational B-Splines) surface of the UA was constructed using the registered boundaries in all three different planes.

Results: A smooth 3D structure of the UA was constructed, which captured the anatomical features from the three anatomical planes, particularly the location of the anterior wall of the nasopharynx. The volume and area of every cross section of the UA can be calculated from the constructed 3D model of UA.

Conclusions: A complete scheme of reconstruction of the UA was proposed, which can be used to measure and evaluate the 3D upper airway accurately.

No MeSH data available.


The 3D nasal cavity constructed using Mimics.This reconstruction is based on the same boundaries segmented by the level set method.
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pone.0130186.g007: The 3D nasal cavity constructed using Mimics.This reconstruction is based on the same boundaries segmented by the level set method.

Mentions: Fig 6 shows the 3D upper airway reconstructed using the NX UG commercial software. Fig 7 is the same nasal cavity constructed using Mimics. The segmented coronal boundaries were converted to binary images, with the inner region of the boundary kept at a fixed lower gray value and the outer region at a fixed higher gray value in the Mimics models. Compared with the construction results given by NX UG, there were many small holes in the Mimics models, and therefore much work needs to be done to fill these holes in the 3D nasal cavity structure. Furthermore, to produce smooth geometry, the constructed object needs to be meshed by the specific function of the software. The more steps that are taken to smooth the constructed structure, the more the constructed object deviates from the real structure. In our construction, the constructed 3D UA was surrounded by the surfaces that passed through all the boundaries, and the region between the adjacent boundaries was constrained by the registered boundary lines crossing all the target boundaries. These procedures can make the reconstructed object depict the real anatomical structure.


A Method for Accurate Reconstructions of the Upper Airway Using Magnetic Resonance Images.

Xiong H, Huang X, Li Y, Li J, Xian J, Huang Y - PLoS ONE (2015)

The 3D nasal cavity constructed using Mimics.This reconstruction is based on the same boundaries segmented by the level set method.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4465749&req=5

pone.0130186.g007: The 3D nasal cavity constructed using Mimics.This reconstruction is based on the same boundaries segmented by the level set method.
Mentions: Fig 6 shows the 3D upper airway reconstructed using the NX UG commercial software. Fig 7 is the same nasal cavity constructed using Mimics. The segmented coronal boundaries were converted to binary images, with the inner region of the boundary kept at a fixed lower gray value and the outer region at a fixed higher gray value in the Mimics models. Compared with the construction results given by NX UG, there were many small holes in the Mimics models, and therefore much work needs to be done to fill these holes in the 3D nasal cavity structure. Furthermore, to produce smooth geometry, the constructed object needs to be meshed by the specific function of the software. The more steps that are taken to smooth the constructed structure, the more the constructed object deviates from the real structure. In our construction, the constructed 3D UA was surrounded by the surfaces that passed through all the boundaries, and the region between the adjacent boundaries was constrained by the registered boundary lines crossing all the target boundaries. These procedures can make the reconstructed object depict the real anatomical structure.

Bottom Line: Finally, the three-dimensional (3D) NURBS (Non-Uniform Rational B-Splines) surface of the UA was constructed using the registered boundaries in all three different planes.A smooth 3D structure of the UA was constructed, which captured the anatomical features from the three anatomical planes, particularly the location of the anterior wall of the nasopharynx.The volume and area of every cross section of the UA can be calculated from the constructed 3D model of UA.

View Article: PubMed Central - PubMed

Affiliation: School of Biomedical Engineering, Capital Medical University, Beijing, China; Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Capital Medical University, Beijing, China.

ABSTRACT

Objective: The purpose of this study is to provide an optimized method to reconstruct the structure of the upper airway (UA) based on magnetic resonance imaging (MRI) that can faithfully show the anatomical structure with a smooth surface without artificial modifications.

Methods: MRI was performed on the head and neck of a healthy young male participant in the axial, coronal and sagittal planes to acquire images of the UA. The level set method was used to segment the boundary of the UA. The boundaries in the three scanning planes were registered according to the positions of crossing points and anatomical characteristics using a Matlab program. Finally, the three-dimensional (3D) NURBS (Non-Uniform Rational B-Splines) surface of the UA was constructed using the registered boundaries in all three different planes.

Results: A smooth 3D structure of the UA was constructed, which captured the anatomical features from the three anatomical planes, particularly the location of the anterior wall of the nasopharynx. The volume and area of every cross section of the UA can be calculated from the constructed 3D model of UA.

Conclusions: A complete scheme of reconstruction of the UA was proposed, which can be used to measure and evaluate the 3D upper airway accurately.

No MeSH data available.