Angebote zu "Density" (12 Treffer)

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Segmentation and Density Estimation in Femur
48,99 € *
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Segmentation and Density Estimation in Femur ab 48.99 € als Taschenbuch: Preprocessing segmentation and analysis of the femoral head bone density. Aus dem Bereich: Bücher, Wissenschaft, Medizin,

Anbieter: hugendubel
Stand: 29.02.2020
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Segmentation and Density Estimation in Femur
48,99 € *
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Segmentation and Density Estimation in Femur ab 48.99 EURO Preprocessing segmentation and analysis of the femoral head bone density

Anbieter: ebook.de
Stand: 29.02.2020
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Segmentation and Density Estimation in Femur
49,00 € *
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We present a novel method for a femoral head segmentation and a density measurement. Our approach is based on a semi-automatical femoral head segmentation from a CT dataset based on finding an optimal path through the axial slices transformed to polar coordinates. The cost function itself is based on a combination of corticallis properties, mostly the directional behavior of the 3D gradients and their size in 2D slices, where they form typical "channels". The final volume is computed using filling and morphological algorithms and its properties are further measured. The final implementation was experimentally validated on the radiology department of the Bulovka hospital and allows a radiologist to intuitively and accurately estimate the femoral head density in approximately 1 to 3 minutes.

Anbieter: Dodax
Stand: 29.02.2020
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Effects of Iodine and Selenium Depletion on the...
79,00 € *
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We investigated the effects of experimental Iodine (I) and/or selenium (Se) depletion on bone quality in young rats. I and Se status and growth in animals were assessed. Weight gain was decreased by I depletion in all animals and by Se depletion in males. I and Se depletion independently decreased bone length and mineral area (BMA) in tibia and femur and Se depletion decreased femur cortical thickness. There was higher bone turnover and lipid oxidation, and lower bone ash weight in male rats. BMA and bone mineral density in vertebra, and bone mineral content in tibia, femur and vertebra were reduced by Se depletion in male rats. Proximal tibia and L3 trabecular bone had a better structure in females than males and when Se was adequate, the deficiency of I increased the structural quality of both tibia and L3 trabecular bone.Tibia cortical bone volume and thickness were higher in males when Se was adequate. The compressive strength of L3 trabecular bone and the bending strength of femur were higher in females. The breaking force of femur was higher in I and Se adequate rats, and the adequacy of I increased femur stiffness in females.

Anbieter: Dodax
Stand: 29.02.2020
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Bone Mineral Density and Atherosclerosis in Pos...
59,00 € *
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The relationship between Bone mineral density (BMD) and atherosclerosis in older postmenopausal women is a subject of increasing concern because of the great importance of atherosclerotic diseases in later life and the need to identify its potentially modifiable risk factors. This thesis was carried on 150 ambulant postmenopausal women apparently healthy (aging from 55 years old and above) in Ain Shams University Hospitals, Cairo, Egypt. Measurement of BMD of lumbar spine and femur neck by DEXA scan and measurement of intima-media thickness of both common and internal carotid arteries by ultrasonography with assessment of plaques and the degree of stenosis (if present) were carried out. The results of this study revealed that there is a statistically significant positive relation between the presence of plaques in carotid arteries and low BMD of both lumbar spine and femur neck. Multinomial logistic regression analysis showed that after controlling for age and duration of menopause, osteoporosis of femur neck could be used as a predictor for atherosclerotic plaques in postmenopausal women.

Anbieter: Dodax
Stand: 29.02.2020
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Finite Element Analysis of Bone Remodeling. Imp...
73,90 CHF *
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Master's Thesis from the year 2006 in the subject Medicine - Biomedical Engineering, grade: 1.0, Technical University of Munich (LS Statik), course: Master of Science of Computational Mechanics, 94 entries in the bibliography, language: English, abstract: The process of adaptive bone remodeling can be described mathematically and simulated in a computer model, integrated with the finite element method. The main focus of this thesis is the implementation of a bone remodeling algorithm in MATLAB and ANSYS on the basis of FEM. The strain energy density is used as mechanical stimulus. The cortical and trabecular bone are described as continuous materials with variable density. This thesis can be divided into four main parts. The first part is due to the material properties of cortical and trabecular bone. The second part is about the remodeling theory and gives an historical review of the developed numerical approaches up to now. The implementation of the remodeling algorithm in ANSYS and MATLAB as well as its validation is topic of part three. In last main part, the algorithm is applied to a 2D FE-model of a human proximal femur.

Anbieter: Orell Fuessli CH
Stand: 29.02.2020
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Effects of Iodine and Selenium Depletion on the...
134,00 CHF *
ggf. zzgl. Versand

We investigated the effects of experimental Iodine (I) and/or selenium (Se) depletion on bone quality in young rats. I and Se status and growth in animals were assessed. Weight gain was decreased by I depletion in all animals and by Se depletion in males. I and Se depletion independently decreased bone length and mineral area (BMA) in tibia and femur and Se depletion decreased femur cortical thickness. There was higher bone turnover and lipid oxidation, and lower bone ash weight in male rats. BMA and bone mineral density in vertebra, and bone mineral content in tibia, femur and vertebra were reduced by Se depletion in male rats. Proximal tibia and L3 trabecular bone had a better structure in females than males and when Se was adequate, the deficiency of I increased the structural quality of both tibia and L3 trabecular bone.Tibia cortical bone volume and thickness were higher in males when Se was adequate. The compressive strength of L3 trabecular bone and the bending strength of femur were higher in females. The breaking force of femur was higher in I and Se adequate rats, and the adequacy of I increased femur stiffness in females.

Anbieter: Orell Fuessli CH
Stand: 29.02.2020
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Finite Element Analysis of Bone Remodeling - Im...
40,90 CHF *
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Master's Thesis from the year 2006 in the subject Medicine - Biomedical Engineering, grade: 1.0, Technical University of Munich (LS Statik), course: Master of Science of Computational Mechanics, 94 entries in the bibliography, language: English, abstract: The process of adaptive bone remodeling can be described mathematically and simulated in a computer model, integrated with the finite element method. The main focus of this thesis is the implementation of a bone remodeling algorithm in MATLAB and ANSYS on the basis of FEM. The strain energy density is used as mechanical stimulus. The cortical and trabecular bone are described as continuous materials with variable density. This thesis can be divided into four main parts. The first part is due to the material properties of cortical and trabecular bone. The second part is about the remodeling theory and gives an historical review of the developed numerical approaches up to now. The implementation of the remodeling algorithm in ANSYS and MATLAB as well as its validation is topic of part three. In last main part, the algorithm is applied to a 2D FE-model of a human proximal femur.

Anbieter: Orell Fuessli CH
Stand: 29.02.2020
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Finite Element Analysis of Bone Remodeling. Imp...
46,30 € *
ggf. zzgl. Versand

Master's Thesis from the year 2006 in the subject Medicine - Biomedical Engineering, grade: 1.0, Technical University of Munich (LS Statik), course: Master of Science of Computational Mechanics, 94 entries in the bibliography, language: English, abstract: The process of adaptive bone remodeling can be described mathematically and simulated in a computer model, integrated with the finite element method. The main focus of this thesis is the implementation of a bone remodeling algorithm in MATLAB and ANSYS on the basis of FEM. The strain energy density is used as mechanical stimulus. The cortical and trabecular bone are described as continuous materials with variable density. This thesis can be divided into four main parts. The first part is due to the material properties of cortical and trabecular bone. The second part is about the remodeling theory and gives an historical review of the developed numerical approaches up to now. The implementation of the remodeling algorithm in ANSYS and MATLAB as well as its validation is topic of part three. In last main part, the algorithm is applied to a 2D FE-model of a human proximal femur.

Anbieter: Thalia AT
Stand: 29.02.2020
Zum Angebot