Journal ArticleDOI
Muscles of mastication model-based MR image segmentation
Hsiao Piau Ng,Sim Heng Ong,Qingmao Hu,Kelvin Weng Chiong Foong,Poh Sun Goh,Wieslaw L. Nowinski +5 more
- Vol. 1, Iss: 3, pp 137-148
TLDR
A model-based method for segmenting the muscles of mastication from MR images was developed and tested and the results show good agreement between manual and automatic segmentations.Abstract:
Objective The muscles of mastication play a major role in the orodigestive system as the principal motive force for the mandible. An algorithm for segmenting these muscles from magnetic resonance (MR) images was developed and tested. Materials and methods Anatomical information about the muscles of mastication in MR images is used to obtain the spatial relationships relating the muscle region of interest (ROI) and head ROI. A model-based technique that involves the spatial relationships between head and muscle ROIs as well as muscle templates is developed. In the segmentation stage, the muscle ROI is derived from the model. Within the muscle ROI, anisotropic diffusion is applied to smooth the texture, followed by thresholding to exclude bone and fat. The muscle template and morphological operators are employed to obtain an initial estimate of the muscle boundary, which then serves as the input contour to the gradient vector flow snake that iterates to the final segmentation. Results The method was applied to segmentation of the masseter, lateral pterygoid and medial pterygoid in 75 images. The overlap indices (κ) achieved are 91.4, 92.1 and 91.2%, respectively. Conclusion A model-based method for segmenting the muscles of mastication from MR images was developed and tested. The results show good agreement between manual and automatic segmentations.read more
Citations
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Journal ArticleDOI
Computer-Assisted versus Conventional Freehand Mandibular Reconstruction with Fibula Free Flap: A Systematic Review and Meta-Analysis.
TL;DR: Computer-assisted mandibular reconstruction showed increased efficiency considering the reduced ischemic time, total operative time, reconstructive time, and length of stay, and the accuracy, reconstruction outcomes, and perioperative cost should be further elucidated.
Journal ArticleDOI
3D Segmentation and Quantification of a Masticatory Muscle from MR Data Using Patient-Specific Models and Matching Distributions
Hsiao Piau Ng,Sim Heng Ong,Jimin Liu,Su Huang,Kelvin Weng Chiong Foong,Poh Sun Goh,Wieslaw L. Nowinski +6 more
TL;DR: Evaluation indicates good agreement between the segmentations and manual tracings, and it was observed that the left and right masseter muscles’ volumes in young adults are higher than those of older (ethnic group removed) adults.
Proceedings ArticleDOI
Medical Image Segmentation Using Feature-based GVF Snake
TL;DR: A feature-based GVF snake is proposed for medical image segmentation that stops its iterations when the area bounded by its propagation is approximately equal to the estimated area and when it undergoes little change over two consecutive iterations.
Journal ArticleDOI
An improved shape determinative slice determination method for patient-specific modeling of facial anatomical structure
Hsiao Piau Ng,Jimin Liu,Su Huang,Sim Heng Ong,Kelvin Weng Chiong Foong,Poh Sun Goh,Wieslaw L. Nowinski +6 more
TL;DR: An improved method to determine shape determinative slices, which captures the salient features of the shape of the 3D anatomical structure, to facilitate building of patient-specific models and rapid quantification is proposed.
Journal Article
Skeletal effects of the alteration of masseter muscle function.
TL;DR: In this article, the effects of muscle denervation and the introduction of the β2-adrenoceptor agonist, formoterol, on the relationship between muscles and underlying skeletal growth were investigated.
References
More filters
Journal ArticleDOI
A Computational Approach to Edge Detection
TL;DR: There is a natural uncertainty principle between detection and localization performance, which are the two main goals, and with this principle a single operator shape is derived which is optimal at any scale.
Journal ArticleDOI
Snakes : Active Contour Models
TL;DR: This work uses snakes for interactive interpretation, in which user-imposed constraint forces guide the snake near features of interest, and uses scale-space continuation to enlarge the capture region surrounding a feature.
Book
Pattern Recognition with Fuzzy Objective Function Algorithms
TL;DR: Books, as a source that may involve the facts, opinion, literature, religion, and many others are the great friends to join with, becomes what you need to get.
Journal ArticleDOI
Scale-space and edge detection using anisotropic diffusion
Pietro Perona,Jitendra Malik +1 more
TL;DR: A new definition of scale-space is suggested, and a class of algorithms used to realize a diffusion process is introduced, chosen to vary spatially in such a way as to encourage intra Region smoothing rather than interregion smoothing.
Journal ArticleDOI
Snakes, shapes, and gradient vector flow
Chenyang Xu,Jerry L. Prince +1 more
TL;DR: This paper presents a new external force for active contours, which is computed as a diffusion of the gradient vectors of a gray-level or binary edge map derived from the image, and has a large capture range and is able to move snakes into boundary concavities.