نتایج جستجو برای: microstructural aspects

تعداد نتایج: 368024  

Journal: :Frontiers in neuroanatomy 2016
Lidia M. Nagae Justin M. Honce Jody Tanabe Erika Shelton Stefan H. Sillau Brian D. Berman

Diffusion tensor imaging (DTI) of the substantia nigra has shown promise in detecting and quantifying neurodegeneration in Parkinson disease (PD). It remains unknown, however, whether differences in microstructural changes within the basal ganglia underlie PD motor subtypes. We investigated microstructural changes within the basal ganglia of mild to moderately affected PD patients using DTI and...

2014
Jinming Zhou Volodymyr Bushlya Ru Peng Zhe Chen Sten Johansson Jan-Erik Stahl Dragos Axinte Ru Lin Peng Jan Eric Stahl

Subsurface microstructural alterations and residual stresses caused by machining significantly affect component lifetime and performance by influencing fatigue, creep, and stress corrosion cracking resistance. Assessing the surface quality of a machined part by characterizing subsurface microstructural alterations and residual stresses is essential for ensuring part performance and lifetime in ...

2016
Zhigang Bai Xiaofen Ma Junzhang Tian Jianwei Dong Jinlong He Wenfeng Zhan Lijuan Xu Yikai Xu Guihua Jiang

PURPOSE To study whole-brain microstructural alterations in patients with end-stage renal disease (ESRD) and examine the relationship between brain microstructure and physiological indictors in the disease. MATERIALS AND METHODS Diffusion tensor imaging data were collected from 35 patients with ESRD (28 men, 18-61 years) and 40 age- and gender-matched healthy controls (HCs, 32 men, 22-58 year...

2016
Ala Birca Vasily A Vakorin Prashob Porayette Sujana Madathil Vann Chau Mike Seed Sam M Doesburg Susan Blaser Dragos A Nita Rohit Sharma Emma G Duerden Edward J Hickey Steven P Miller Cecil D Hahn

OBJECTIVE To evaluate whether structural and microstructural brain abnormalities in neonates with congenital heart disease (CHD) correlate with neuronal network dysfunction measured by analysis of EEG connectivity. METHODS We studied a prospective cohort of 20 neonates with CHD who underwent continuous EEG monitoring before surgery to assess functional brain maturation and network connectivit...

2012
Geoffrey L Kung Olujimi Ajijola Rafael J Ramirez Jin Kyu Gahm Wei Zhou N Wisniewski Aman Mahajan Alan Garfinkel Kalyaman Shivkumar Daniel Ennis

The objective of this study was to quantify microstructural remodeling in peri-infarcted and infarcted porcine myocardium using diffusion tensor MRI (DT-MRI) for the first time. High resolution ex vivo late gadolinium enhanced (LGE) MRI was used to segment the DT-MRI data into normal, peri-infarct and infarcted myocardium. LGE-MRI based segmentation produces regions with significantly different...

Journal: :The Journal of chemical physics 2010
Noam Shemesh Evren Ozarslan Peter J Basser Yoram Cohen

NMR observable nuclei undergoing restricted diffusion within confining pores are important reporters for microstructural features of porous media including, inter-alia, biological tissues, emulsions and rocks. Diffusion NMR, and especially the single-pulsed field gradient (s-PFG) methodology, is one of the most important noninvasive tools for studying such opaque samples, enabling extraction of...

2009
M. F. Falangola C. Hu V. Adisetiyo A. Tabesh W. R. Gelb J. H. Jensen

Figure 1. Significant (*) group mean differences were detected for Kra when compared the adolescent group with the young adult (p=0.004) and elderly group (p=0.01). The increase of Kra represents an increase in the microstructural complexity of the thalamus, possibly related to ongoing myelination and increase in fiber packing density. Assessment of Age-Related Microstructural Changes in the Th...

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