The Effect of Labeled/Unlabeled Prior Information for Masseter Segmentation

Tabar, Yousef Rezaei
Ulusoy, İlkay
Several segmentation methods are implemented and applied to segment the facial masseter tissue from magnetic resonance images. The common idea for all methods is to take advantage of prior information from different MR images belonging to different individuals in segmentation of a test MR image. Standard atlas-based segmentation methods and probabilistic segmentation methods based on Markov random field use labeled prior information. In this study, a new approach is also proposed where unlabeled prior information from a set of MR images is used to segment masseter tissue in a probabilistic framework. The proposed method uses only a seed point that indicates the target tissue and performs automatic segmentation for the selected tissue without using labeled training set. The segmentation results of all methods are validated and compared where the influences of labeled or unlabeled prior information and initialization are discussed particularly. It is shown that if appropriate modeling is done, there is no need for labeled prior information. The best accuracy is obtained by the proposed approach where unlabeled prior information is used.


Effect of thermal neutron irradiation on the elastic constants of tourmaline
Özkan, H. (Informa UK Limited, 1987-2)
The effect of thermal neutron irradiation due to the B10(n, α)Li7 reaction on the elastic wave velocities and the elastic moduli of tourmaline crystals has been studied. Oriented tourmaline samples have been irradiated with thermal neutrons to 7.6 × 1018n/cm2 and the elastic wave velocities determined by ultrasonic measurements. The elastic wave velocities are not affected by thermal neutron irradiation below 8 × 10l7n/cm2, effects starting to appear at approximately 1 × l018n/cm2 with more important decrea...
ONDER, M; Kuzuoğlu, Mustafa (Institution of Engineering and Technology (IET), 1992-10-01)
An optimisation approach is presented for the problem of reconstructing the permittivity and conductivity profiles of a dielectric slab from the reflected and transmitted field data. The problem is treated as an optimal control problem where the norm of the difference of measured and calculated boundary data is minimised subject to the state equation governing the system. The original constrained optimisation problem is reduced to the evaluation of stationary points of an augmented functional which is obtai...
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In the present study Fourier Transform Infrared Spectroscopy was used to examine the effects of streptozotocin-induced diabetes mellitus on the structural components of slow- and fast-twitch rat skeletal muscles, at molecular level. Diabetes mellitus is a chronic disorder of carbohydrate, fat and protein metabolism, which is characterized by hyperglycemia caused by a defective or deficient insulin secretory response. The effect of diabetes is seen on a variety of tissues leading to important secondary compl...
An Alternative Interpretation for the Spectral Response of Self-Assembled Pseudoisocyanine J-Aggregates in Aqueous Solution
Gulen, Demet (American Scientific Publishers, 2009-04-01)
An alternative interpretation for the optical response of pseudoisocyanine J-aggregates is given on the basis of a recently suggested monomeric absorption spectrum exhibiting the seemingly universal spectral fingerprint of cyanines. Temperature-dependence of the generic J-aggregate absorption spectra reported in the literature is quantified by employing simulations obtained in the Frenkel exciton formalism augmented by diagonal energetic disorder and exciton-phonon coupling. It is concluded that the pseudoi...
A Five Layer One-Dimensional PEMFC Model with Detailed Electrode Kinetics
Ficicilar, B.; Eroğlu, İnci; Nguyen, T. V. (2010-10-01)
In this study, a non-isothermal, two-phase, one-dimensional, and steady state proton exchange membrane (PEM) fuel cell model is developed to investigate the detailed electrode kinetics in the anode and cathode catalytic regions and the effects of these reaction mechanisms on the performance of a PEM fuel cell. Langmuir-Butler-Volmer (LBV) type reaction rate expressions are suggested for both anode and cathode electrochemical reactions. A two-phase energy balance approach is used to catch the thermal transpo...
Citation Formats
Y. R. Tabar and İ. Ulusoy, “The Effect of Labeled/Unlabeled Prior Information for Masseter Segmentation,” MATHEMATICAL PROBLEMS IN ENGINEERING, pp. 0–0, 2013, Accessed: 00, 2020. [Online]. Available: