Geopolymers are emerging construction materials with lower carbon dioxide emissions compared to the conventional cementitious materials. The knowledge of curing process and related pore structures important for optimizing properties these different applications. final structure sensitive amount used water, however specifics unclear. metakaolin-based geopolymers a narrow water-to-solid (w/s) rat...

The aim of this study was to test the ability of magnetic resonance imaging (MRI) technique to characterize gonad development and to determine the sex of live Pacific oysters through their shells. A preliminary nuclear magnetic resonance (NMR) relaxometry study was conducted to characterize T1 and T2 NMR relaxation parameters for the main oyster organs. This showed that T1-weighted MRI sequence...

Two quantitative ocular magnetic resonance imaging (MRI) methods for the clinical use in Ophthalmology and Radiology were developed. Ocular MRI images with spatio-temporal resoultions of 0.78/1.56/2/(5 to 84) mm/mm/mm/s were acquired from patients with diabetic retinopathy and normal subjects using a 1 T MRI system. T1 and T2 MRI relaxometry maps were generated offline from the MRI images acqui...

Poly (Dimethyl siloxane) thin films were prepared by solvent evaporation method in porous alumina hosts. The thickness of these layers ranged from multilayer to sub-monolayer. Different NMR methods (FFC relaxometry, transverse relaxation, H Double quantum NMR) were applied to study the dynamics and order in these thin films. We found that dynamic restrictions and order increased with decreasing...

In vivo spin spin relaxation time (T2) heterogeneity of hyperpolarized [13C,15N2]urea in the rat kidney was investigated. Selective quenching of the vascular hyperpolarized 13C signal with a macromolecular relaxation agent revealed that a long-T2 component of the [13C,15N2]urea signal originated from the renal extravascular space, thus allowing the vascular and renal filtrate contrast agent poo...

BACKGROUND Myocardial black blood (BB) T2* relaxometry at 1.5T provides robust, reproducible and calibrated non-invasive assessment of cardiac iron burden. In vitro data has shown that like T2*, novel native Modified Look-Locker Inversion recovery (MOLLI) T1 shortens with increasing tissue iron. The relative merits of T1 and T2* are largely unexplored. We compared the established 1.5T BB T2* te...

Introduction: As part of our work on myocardial iron quantification we have developed an breath-hold fast spin echo (FSE) T2 technique with good reproducibility (1,2). This T2 technique, however, is based on region-ofinterest (ROI) analysis. Although ROI analysis can increase signal to noise ratio (SNR), it may introduce errors to T2 measurement by averaging every pixel within the region. By co...

Previous studies have shown that maturation of the white matter in terms of its relative signal intensity changes on MRI is almost complete at 2-3 years of age. We hypothesized that quantitative analysis may show maturation of the white matter during childhood and adolescence. In the present study we performed multi-echo T2 relaxometry in 33 healthy subjects (girls, 15; boys, 18) aged 3-15 year...

Magnetic resonance imaging (MRI) and MRI relaxometry were used to investigate disturbed brain myelination in 18q- syndrome, a disorder characterized by mental retardation, dysmorphic features, and growth failure. T1-weighted and dual spin-echo T2-weighted MR images were obtained, and T1 and T2 parametric image maps were created for 20 patients and 12 controls. MRI demonstrated abnormal brain wh...