Correlations of low-field NMR and variable-field NMR parameters with osteoarthritis in human articular cartilage under load

Characterization of Shales with Low Field Nmr

Nuclear Magnetic Resonance (NMR) relaxation methods are key techniques for evaluating shales, both from cores and logging data. First, very small pore sizes, down to nano-meter length scales, can be detected and quantified if the NMR tool has the ability to measure relaxation times in the range [0.1 – 1 ms], and second the different proton populations (water, oil, gas, organic matter) can be di...

Permanent Magnet Arrangements for Low-Field NMR

For low-field NMR, NdFeB permanent magnet arrangements are proposed to provide the static polarizing magnetic field. Especially a parallel and a circular arrangement of the permanent magnets, iron yokes and small shim magnets were tested and improved by COMSOL. The intent was to guide the design and the construction of NMR magnets by calculating the magnetic field strength and the associated fi...

Load-dependent low-field profiling and relaxometry of osteoarthritic articular cartilage

At low magnetic fields, T1 variation within cartilage represents a robust parameter that is employed to quantify the layered structure in the tissue and is sensitive to factors such as enzymatic degradation, external load, and diseases such as osteoarthritis. Variable-field relaxometry provides access to the quadrupolar dips that probe proton-nitrogen interaction and thus the content and local ...

اندازه گیری پراکندگی تخلخل در مخازن کربناته با استفاده از(Low Field NMR)

Low-Field NMR Relaxation Times Distributions and Their Magnetic Field Dependence as a Possible Biomarker in Cartilage

The dependence of the proton NMR relaxation times on field strength and on location within the tissue has been determined for a number of bovine and human articular cartilage samples. While the strong variation of T2 across the triplelayered cartilage structure as well as its orientation dependence are well known from clinical and laboratory high-field studies, T1 shows similar behavior only in...