scholarly journals Dehydration assessment via a portable, single sided magnetic resonance sensor

2019 ◽  
Vol 83 (4) ◽  
pp. 1390-1404 ◽  
Author(s):  
Ashvin Bashyam ◽  
Chris J. Frangieh ◽  
Matthew Li ◽  
Michael J. Cima
Keyword(s):  
Magnetic Resonance ◽  
Resonance Sensor

scholarly journals Mini Inside-Out Nuclear Magnetic Resonance Sensor Design for Soil Moisture Measurements

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1682 ◽  
Author(s):  
Jiamin Wu ◽  
Pan Guo ◽  
Sheng Shen ◽  
Yucheng He ◽  
Xin Huang ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Soil Moisture ◽  
Magnetic Resonance ◽  
Sandy Soil ◽  
Particle Diameter ◽  
Silica Sand ◽  
Resonance Sensor ◽  
Small Pore ◽  
Inside Out ◽  
Nuclear Magnetic

The improvement of water management in agriculture by exactly detecting moisture parameters of soil is crucial. To investigate this problem, a mini inside-out nuclear magnetic resonance sensor (NMR) was proposed to measure moisture parameters of model soils. This sensor combines three cylindrical magnets that are magnetized in the axial direction and three arc spiral coils of the same size in series. We calculated and optimized the magnet structure by equivalent magnetization to current density. By adjusting the radius and height between the cylinders, a circumferential symmetric constant gradient field (2.28 T/m) was obtained. The NMR sensor was set at 2.424 MHz to measure the water content of sandy soil with small particle diameter and silica sand with large particle diameter. The complete decaying, an NMR signal was analyzed through inverse Laplace transformation and averaged on a T2 space. According to the results, moisture content of the sample is positively correlated with the integral area of T2 spectrum peak (Apeak); T2 of the water in small pores is shorter than that in large pores, because the movement of water molecules are limited by the inner wall of the pores. In the same volume, water in large pore sample is more than that in small pore sample, so Apeak of silica sand is larger than Apeak of sandy soil. Therefore, the sensor is capable of detecting moisture both content and pore size of the sample. This mini sensor (4.0 cm in diameter and 10 cm in length) is portable, and the lowest measurable humidity is 0.38%. Thus, this sensor will allow easy soil moisture measurements on-field in the future.

Analysis of Characteristics of In-Line Magnetic Resonance Sensor

2006 ◽  
Vol 321-323 ◽  
pp. 1221-1224 ◽  
Author(s):  
Seong Min Kim ◽  
Michael J. McCarthy
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Real Time ◽  
Quality Evaluation ◽  
Data Acquisition System ◽  
Internal Quality ◽  
Conveyor System ◽  
Resonance Sensor ◽  
Nmr Techniques

This study was performed to show the feasibility of nuclear magnetic resonance (NMR) techniques for quality evaluation of various agricultural and food products. A real-time in-line NMR quality evaluation sensor was designed, constructed and tested. The device consists of an NMR spectrometer coupled to a conveyor system and a data acquisition system. The conveyor was run at speeds ranging from 0 to 300 mm/s. An NMR signal can be detected when a sample is within ±50 mm of the NMR coil center. The response of NMR sensor was tested using several fruits. The results showed a feasibility of an NMR sensor for evaluating internal quality of various fruits.

A portable single-sided magnetic-resonance sensor for the grading of liver steatosis and fibrosis

2020 ◽  
Author(s):  
Ashvin Bashyam ◽  
Chris J. Frangieh ◽  
Siavash Raigani ◽  
Jeremy Sogo ◽  
Roderick T. Bronson ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Liver Steatosis ◽  
Resonance Sensor

Monitoring the Transesterification Reaction Used in Biodiesel Production, with a Low Cost Unilateral Nuclear Magnetic Resonance Sensor

2011 ◽  
Vol 25 (6) ◽  
pp. 2696-2701 ◽  
Author(s):  
Luis F. Cabeça ◽  
Lucinéia V. Marconcini ◽  
Giovanni P. Mambrini ◽  
Rodrigo B. V. Azeredo ◽  
Luiz A. Colnago
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Low Cost ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Resonance Sensor ◽  
Nuclear Magnetic

scholarly journals Optical method for verification of homogeneity of phantoms for calibration of magnetic resonance

2018 ◽  
Vol 10 (3) ◽  
pp. 82
Author(s):  
Anna Magdalena Sękowska ◽  
Aleksandra Kamińska ◽  
Agnieszka Sabisz
Keyword(s):  
Optical Coherence Tomography ◽  
Quality Assurance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Tomography ◽  
Spin Lattice Relaxation ◽  
Optical Coherence ◽  
Optic Express ◽  
Time Calibration ◽  
Resonance Sensor ◽  
Set Up

The primary purpose of this study was to develop a laboratory photonic set-up for characterisation of homogeneity of gel phantoms for calibration of a magnetic resonance. In this system optical coherence tomography allows the detection of micro- and macroscopic heterogeneities of a structure. The set-up was used to perform measurements of agar and agar-carrageenan gels, which are the basis for more complex phantoms for magnetic resonance calibration. Obtained results were compared with magnetic resonance tomography methods used to detect macroscopic spatial differences in composition and heterogeneities in phantoms. Full Text: PDF ReferencesPrice R. R. et al., Quality assurance methods and phantoms for magnetic resonance imaging: report of AAPM nuclear magnetic resonance Task Group No. 1., Med Phys. 1990 Mar-Apr;17(2):287-95. CrossRef Tofts P.S., QA: quality assurance, accuracy, precision and phantoms. Chapter 3 in Tofts P.S. (ed.) Quantitative MRI of the brain: measuring changes caused by disease. Chichester: John Wiley, 55-81. ISBN: 0-470-84721-2 CrossRef Wróbel M., Popov A., Bykov A., Tuchin V.V., Jędrzejewska-Szczerska M., Nanoparticle-free tissue-mimicking phantoms with intrinsic scattering, Biomedical Optic Express, vol. 7(6), 2088-2094 (2016). CrossRef Feder I., Wróbel M., Duadi H., Jędrzejewska-Szczerska M., Fixler D., Experimental results of full scattering profile from finger tissue-like phantom, Biomedical Optic Express, vol. 7 (11), 4695-4701 (2016). CrossRef Wróbel M. S. et al., Use of optical skin phantoms for pre-clinical evaluation of laser efficiency for skin lesion therapy, Journal of Biomedical Optics, 20(8), 20(8):085003 (2015). CrossRef Wróbel M .S. et al., Multi-layered tissue head phantoms for noninvasive optical diagnostics, Journal of Innovative Optical Health Sciences, 8(3), 1541005-1÷1541005-10 (2015). CrossRef Hellerbach A, Schuster V, Jansen A, Sommer J., MRI Phantoms - Are There Alternatives to Agar?, Plos One, 2013;8(8), ARTN e70343. CrossRef Almazrouei N. K., Newton M. I., Dye E. R., Morris R. H., Novel food-safe spin-lattice relaxation time calibration samples for use in magnetic resonance sensor development, Proceedings 2018, 2, 122. CrossRef Ohno S. et al., Production of a Human-Tissue-Equivalent MRI Phantom: Optimization of Material Heating, Magn Reson Med Sci. 2008;7(3):131-40. CrossRef Choma M. A., SarunicM. V., Yang C., Izatt J. A., Sensitivity advantage of swept source and Fourier domain optical coherence tomography, Opt. Express 11, 2183-2189 (2003). CrossRef Strąkowski M. R., Głowacki M., Kamińska A., Sawczak M., Gold nanoparticles evaluation using functional optical coherence tomography, Proc. SPIE 10053, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXI, 1005336 (17 February 2017). CrossRef

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