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In this paper, we introduce a compact, single-sided stray field sensor for NMR relaxometry applications. The sensor consists of four main components: the magnet, the RF coil, the spectrometer, and the translation stage. Our proposed magnet, an improved design of the Profile NMR-MOUSE, is designed for low weight, compactness, and magnetic field homogeneity, achieved through various shim strategies using a mixed genetic algorithm. The magnet comprises eight NdFeB blocks, generating a magnetic field of 0.424T within the sensitive region, positioned 12 mm above the magnet surface. For high spatial resolution measurements, we optimized the sensor performance by using a custom-designed rf coil, providing maximum sensitivity, lateral selectivity, and a dead time of less than 20µs. Moreover, we utilized 3D-printed structures to precisely align the sensitive slice within the object, using an experimental approach based on CPMG measurements. The presented setup achieved a spatial resolution of 50µm, with resolution changes proportional to acquisition time. We demonstrate the sensor's versatility and high resolution with measurements on materials such as cosmetics, elastomers, glue, and wood, verifying the good performance of our design, our alignment strategy, and the measuring scheme.
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http://dx.doi.org/10.1016/j.jmr.2024.107798 | DOI Listing |
J Am Chem Soc
December 2024
Univ Rennes, ENSCR, CNRS, ISCR-UMR6226, Université de Rennes, Rennes 35042, France.
Metal halide perovskites, including some of their related perovskitoid structures, form a semiconductor class of their own, which is arousing ever-growing interest from the scientific community. With halides being involved in the various structural arrangements, namely, pure corner-sharing MX (M is metal and X is halide) octahedra, for perovskite networks, or alternatively a combination of corner-, edge-, and/or face-sharing for related perovskitoids, they represent the ideal probe for characterizing the way octahedra are linked together. Well known for their inherently large quadrupolar constants, which is detrimental to the resolution of nuclear magnetic resonance spectroscopy, most abundant halide isotopes (Cl, Br, I) are in turn attractive for magnetic field-free nuclear quadrupolar resonance (NQR) spectroscopy.
View Article and Find Full Text PDFVopr Kurortol Fizioter Lech Fiz Kult
December 2024
Saratov State Medical University named after V. I. Razumovsky, Saratov, Russia.
Unlabelled: The problem of rational activation of functions of the central nervous system of a human remains highly relevant.
Objective: To analyze scientific data on the use of transcranial exposure method in obesity.
Results: The literature review presents current data on the effectiveness of non-invasive hardware brain neurostimulation in obese patients.
Discov Nano
December 2024
School of Electrical Engineering and Computing (SoEEC), Adama Science and Technology University (AS-TU), 1888, Adama, Ethiopia.
Cancer is a deadly disease with complex pathophysiological nature and is the leading cause of death worldwide. Traditional diagnosis methods often detect cancer at a considerably critical stage and the conventional methods of treatment like chemotherapy, radiation therapy, targeted therapy, and immunotherapy have several limitations, multidrug resistance, cytotoxicity, and lack of specificity are a few examples. These pose substantial challenge for effective and favourable cancer treatment.
View Article and Find Full Text PDFRadiology
December 2024
From the Departments of Radiology (F.C., A.L.) and Urology (M.G.), Clinique de l'Alma, 166 Rue de l'Université, 75007 Paris, France; Department of Urology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands (K.d.B., L.v.R.); and Department of Pathology, i-Path Institut de Pathologie des Hauts-de-France, Amiens, France (P.C.).
Background MRI-guided focal laser ablation (FLA) is a promising treatment in localized prostate cancer (PCa). MRI-guided micro-US FLA shows potential for outpatient use, but its clinical application remains unexplored. Purpose To evaluate the safety, feasibility, and 12-month functional and oncologic outcomes of MRI-guided micro-US transperineal FLA in localized PCa and to assess the accuracy of micro-US in showing lesions depicted at MRI with Prostate Imaging Reporting and Data System (PI-RADS) score of 3 or higher.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States.
In Nature, the four-electron reduction of O is catalyzed at preorganized multimetallic active sites. These complex active sites often feature low-coordinate, redox-active metal centers precisely positioned to facilitate rapid O activation processes that obviate the generation of toxic, partially reduced oxygen species. Very few biomimetic constructs simultaneously recapitulate the complexity and reactivity of these biological cofactors.
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