Boundary transformation representation of attractor shape deformation

2021 ◽  
Vol 31 (8) ◽  
pp. 083133
Author(s):  
A. R. Sloboda
Keyword(s):  
Shape Deformation

scholarly journals The Correlations between Horizontal and Vertical Peripheral Refractions and Human Eye Shape Using Magnetic Resonance Imaging in Highly Myopic Eyes

Healthcare ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 966
Author(s):  
Hui-Ying Kuo ◽  
John Ching-Jen Hsiao ◽  
Jing-Jie Chen ◽  
Chi-Hung Lee ◽  
Chun-Chao Chuang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Shape Deformation ◽  
Spherical Equivalent ◽  
Horizontal Meridian ◽  
Resonance Imaging ◽  
Vertical Meridian ◽  
Useful Knowledge ◽  
Human Eye ◽  
The Relationship

The aim of this study was to determine the relationship between relative peripheral refraction and retinal shape by 2-D magnetic resonance imaging in high myopes. Thirty-five young adults aged 20 to 30 years participated in this study with 16 high myopes (spherical equivalent < −6.00 D) and 19 emmetropes (+0.50 to −0.50 D). An open field autorefractor was used to measure refractions from the center out to 60° in the horizontal meridian and out to around 20° in the vertical meridian, with a step of 3 degrees. Axial length was measured by using A-scan ultrasonography. In addition, images of axial, sagittal, and tangential sections were obtained using 2-D magnetic resonance imaging. The highly myopic group had a significantly relative peripheral hyperopic refraction and showed a prolate ocular shape compared to the emmetropic group. The highly myopic group had relative peripheral hyperopic refraction and showed a prolate ocular form. Significant differences in the ratios of height/axial (1.01 ± 0.02 vs. 0.94 ± 0.03) and width/axial (0.99 ± 0.17 vs. 0.93 ± 0.04) were found from the MRI images between the emmetropic and the highly myopic eyes (p < 0.001). There was a negative correlation between the retina’s curvature and relative peripheral refraction for both temporal (Pearson r = −0.459; p < 0.01) and nasal (Pearson r = −0.277; p = 0.011) retina. For the highly myopic eyes, the amount of peripheral hyperopic defocus is correlated to its ocular shape deformation. This could be the first study investigating the relationship between peripheral refraction and ocular dimension in high myopes, and it is hoped to provide useful knowledge of how the development of myopia changes human eye shape.

scholarly journals Quantitative Assessment of Shape Deformation of Regional Cranial Bone for Evaluation of Surgical Effect in Patients with Craniosynostosis

2021 ◽  
Vol 11 (3) ◽  
pp. 990
Author(s):  
Min Jin Lee ◽  
Helen Hong ◽  
Kyu Won Shim
Keyword(s):  
Quantitative Assessment ◽  
Deformable Registration ◽  
Occipital Bone ◽  
Cranial Bone ◽  
Shape Deformation ◽  
Surface Model ◽  
Cephalic Index ◽  
Skull Shape ◽  
Quantification Method ◽  
Parietal Bones

Surgery in patients with craniosynostosis is a common treatment to correct the deformed skull shape, and it is necessary to verify the surgical effect of correction on the regional cranial bone. We propose a quantification method for evaluating surgical effects on regional cranial bones by comparing preoperative and postoperative skull shapes. To divide preoperative and postoperative skulls into two frontal bones, two parietal bones, and the occipital bone, and to estimate the shape deformation of regional cranial bones between the preoperative and postoperative skulls, an age-matched mean-normal skull surface model already divided into five bones is deformed into a preoperative skull, and a deformed mean-normal skull surface model is redeformed into a postoperative skull. To quantify the degree of the expansion and reduction of regional cranial bones after surgery, expansion and reduction indices of the five cranial bones are calculated using the deformable registration as deformation information. The proposed quantification method overcomes the quantification difficulty when using the traditional cephalic index(CI) by analyzing regional cranial bones and provides useful information for quantifying the surgical effects of craniosynostosis patients with symmetric and asymmetric deformities.

Salt-responsive polyampholyte-based hydrogel actuators with gradient porous structures

2021 ◽  
Author(s):  
Zijian Shao ◽  
Shanshan Wu ◽  
Qian Zhang ◽  
Hui Xie ◽  
Tao Xiang ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Shape Deformation ◽  
Porous Structures ◽  
Gradient Distribution

A polyampholyte-based hydrogel actuator with water-responsive shape deformation was fabricated, and the gradient distribution of chemical composition was proved by micro-FTIR.

Pattern-aware shape deformation using sliding dockers

2011 ◽  
Author(s):  
Martin Bokeloh ◽  
Michael Wand ◽  
Vladlen Koltun ◽  
Hans-Peter Seidel
Keyword(s):  
Shape Deformation

scholarly journals Modeling of Personalized Anatomy Using Plastic Strains

2021 ◽  
Vol 40 (2) ◽  
pp. 1-21
Author(s):  
Bohan Wang ◽  
George Matcuk ◽  
Jernej Barbič
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Large Strain ◽  
Human Anatomy ◽  
Shape Deformation ◽  
Human Hand ◽  
Plastic Strains ◽  
Resonance Imaging ◽  
Deformation Method

We present a method for modeling solid objects undergoing large spatially varying and/or anisotropic strains, and use it to reconstruct human anatomy from medical images. Our novel shape deformation method uses plastic strains and the finite element method to successfully model shapes undergoing large and/or anisotropic strains, specified by sparse point constraints on the boundary of the object. We extensively compare our method to standard second-order shape deformation methods, variational methods, and surface-based methods, and demonstrate that our method avoids the spikiness, wiggliness, and other artifacts of previous methods. We demonstrate how to perform such shape deformation both for attached and un-attached (“free flying”) objects, using a novel method to solve linear systems with singular matrices with a known nullspace. Although our method is applicable to general large-strain shape deformation modeling, we use it to create personalized 3D triangle and volumetric meshes of human organs, based on magnetic resonance imaging or computed tomography scans. Given a medically accurate anatomy template of a generic individual, we optimize the geometry of the organ to match the magnetic resonance imaging or computed tomography scan of a specific individual. Our examples include human hand muscles, a liver, a hip bone, and a gluteus medius muscle (“hip abductor”).

scholarly journals Hippocampal Shape Deformation in Female Patients with Unremitting Major Depressive Disorder

2011 ◽  
Vol 32 (4) ◽  
pp. 671-676 ◽  
Author(s):  
W.S. Tae ◽  
S.S. Kim ◽  
K.U. Lee ◽  
E.C. Nam ◽  
J.W. Choi ◽  
...  
Keyword(s):  
Major Depressive Disorder ◽  
Depressive Disorder ◽  
Shape Deformation ◽  
Major Depressive ◽  
Female Patients
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