Applied Magnetic Resonance最新文献_第6页

Crossover to XXZ Chain Spin Liquid in the Frustrated Quantum Magnet Cs(_2)CoCl(_4) 受挫量子磁体 Cs $$_2$$ CoCl $$_4$$ 中向 XXZ 链自旋液体的跨越

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-27 DOI: 10.1007/s00723-024-01669-5

T. A. Soldatov, V. S. Edelman, A. I. Smirnov

引用次数: 0

Impact of Porous Matrix Morphology on the Phase Diagrams in the GaInSn Alloy Under Nanoconfinement 多孔基质形态对纳米强化下 GaInSn 合金相图的影响

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-26 DOI: 10.1007/s00723-024-01672-w

A. A. Vasilev, D. Yu. Nefedov, E. V. Charnaya, Yu. A. Kumzerov, A. V. Fokin

引用次数: 0

Automated Quantification of Lateral and Medial Temporal Lobe Volumes for Improved Diagnosis of Early Alzheimer’s Disease 自动量化颞叶外侧和内侧容积，提高早期阿尔茨海默病诊断水平

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-25 DOI: 10.1007/s00723-024-01667-7

Marufjon Salokhiddinov, Dharmesh Singh, Akash Gandhamal, Dileep Kumar, Elisabeth Stamou, Munojat Ismailova, Gulnora Rakhimbaeva, Dilshod Tolibov

{"title":"Automated Quantification of Lateral and Medial Temporal Lobe Volumes for Improved Diagnosis of Early Alzheimer’s Disease","authors":"Marufjon Salokhiddinov, Dharmesh Singh, Akash Gandhamal, Dileep Kumar, Elisabeth Stamou, Munojat Ismailova, Gulnora Rakhimbaeva, Dilshod Tolibov","doi":"10.1007/s00723-024-01667-7","DOIUrl":"10.1007/s00723-024-01667-7","url":null,"abstract":"<div><p>The purpose of this study was to evaluate the importance of automated lateral and medial temporal volume measurement technique for the early diagnosis of Alzheimer's disease (AD). A cross-sectional T1-weighted magnetic resonance image was obtained from 39 healthy adults and 39 patients with mild AD. The study demonstrates significant volume loss in the lateral temporal lobe (LTL) and medial temporal lobe (MTL) regions of the brain in early cases of AD, suggesting that volume loss could be used as a viable biomarker for mild AD diagnosis. Using a deep learning-based auto-segmentation network (CINet), the study accurately estimates the volumes of various LTL and MTL brain regions. Notably, higher volume loss is observed in the left MTL and LTL regions compared to the right, indicating an asymmetric impact in mild AD. The study underscores the significance of automated technique for AD diagnosis and monitoring disease progression, contributing valuable insights for potential early interventions.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 7","pages":"719 - 736"},"PeriodicalIF":1.1,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-024-01667-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lindblad Relaxation of Multiple Quantum NMR Coherence in Two-Spin Systems 双针系统中多重量子核磁共振相干的林德布拉德弛豫

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-25 DOI: 10.1007/s00723-024-01668-6

G. A. Bochkin, E. B. Fel’dman, E. I. Kuznetsova, S. G. Vasil’ev

引用次数: 0

Translational Mobility in Ternary Systems “Lithium Acetate–Cesium Acetate–Water” According to PFG NMR Data 根据 PFG NMR 数据得出的 "醋酸锂-醋酸铯-水 "三元体系中的转化迁移率

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-22 DOI: 10.1007/s00723-024-01670-y

Kirill A. Mukhin, Olga N. Pestova, Vladimir V. Matveev, Vladimir I. Chizhik

{"title":"Translational Mobility in Ternary Systems “Lithium Acetate–Cesium Acetate–Water” According to PFG NMR Data","authors":"Kirill A. Mukhin, Olga N. Pestova, Vladimir V. Matveev, Vladimir I. Chizhik","doi":"10.1007/s00723-024-01670-y","DOIUrl":"10.1007/s00723-024-01670-y","url":null,"abstract":"<div><p>The development of ecofriendly electrolytes for lithium-ion batteries is one of the actual tasks of modern electrochemistry. In particular, to this purpose, the highly concentrated ternary aqueous systems based on lithium acetate (LiOAc) have been actively investigated. Here, the diffusion coefficients of <sup>7</sup>Li<sup>+</sup> and <sup>133</sup>Cs<sup>+</sup> cations, OAc<sup>–</sup> anion, as well as water (<sup>1</sup>H), in ternary aqueous solutions of cesium and lithium acetates in a range of temperature (– 15 ÷ 35 °C) have been measured using the PFG NMR method. A direct attempt to interpret the obtained dependences within the framework of the Stokes–Einstein model led to the fact that the calculated hydrodynamic radius of the Cs<sup>+</sup> cation turned out to be noticeably smaller than its crystallographic one. An approach to describing the high rate of diffusion of cesium cations is proposed, based on taking into account the local viscosity near cations of both types. The use of the approach allowed us to calculate more correctly the hydrodynamic radii of cations, while remaining within the framework of the Stokes–Einstein model. As a result, it has been possible to describe the features of translational motion of components in a complex system that is interesting for electrochemical applications.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 8","pages":"775 - 783"},"PeriodicalIF":1.1,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Designing Gradient Coils Considering the Ferromagnetic Effect for a Movable Permanent MRI System 为可移动永久磁共振成像系统设计考虑铁磁效应的梯度线圈

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-19 DOI: 10.1007/s00723-024-01664-w

Jiamin Wu, Zheng Xu, Yanhe Zhu, Yucheng He

{"title":"Designing Gradient Coils Considering the Ferromagnetic Effect for a Movable Permanent MRI System","authors":"Jiamin Wu, Zheng Xu, Yanhe Zhu, Yucheng He","doi":"10.1007/s00723-024-01664-w","DOIUrl":"10.1007/s00723-024-01664-w","url":null,"abstract":"<div><p>The gradient coils represent an indispensable constituent within magnetic resonance imaging systems. Their performance significantly impacts the quality of images, particularly the nonlinearity of the gradient magnetic field. Due to the presence of ferromagnetic materials surrounding the gradient coil in the permanent magnet system, the magnetic field of the gradient coil experiences influence. Consideration must be given to ferromagnetic materials during the design phase. The objective of this study is to design gradient coils that mitigates the impact of ferromagnetic materials on gradient field linearity. In this paper, the original coil structure is formulated utilizing the discrete trajectory method, while introducing mirrored current to elucidate the effects of ferromagnetic material. Through the integration of these two methods, gradient coil structures with excellent linearity are achieved. Ultimately, the optimal gradient coils are fabricated, and computational as well as experimental findings demonstrate concordance between measured nonlinear degree and efficiency of the gradient coils with theoretical calculations in the presence of ferromagnetic materials.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 7","pages":"701 - 717"},"PeriodicalIF":1.1,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visualization of Conductors Inside an MRI Coil 磁共振成像线圈内导体的可视化

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-16 DOI: 10.1007/s00723-024-01666-8

Nikolay V. Anisimov, Lev L. Gervits, Arina A. Tarasova

{"title":"Visualization of Conductors Inside an MRI Coil","authors":"Nikolay V. Anisimov, Lev L. Gervits, Arina A. Tarasova","doi":"10.1007/s00723-024-01666-8","DOIUrl":"10.1007/s00723-024-01666-8","url":null,"abstract":"<div><p>This article reports on the use of fluorocarbons as an imaging medium in MRI. The function of this medium is to uniformly fill the space intended for MR scanning and to provide a strong signal against which objects of interest can be visualized. In our case, such objects were coils used as signal sensors in MRI studies. The aim of the study is visualization of the conductors located inside of an MRI coil and, therefore, could not be visually assessed. To enable the conductor’s imaging, signal amplification from the imaging medium in the vicinity of the conductors was used. The physical phenomenon behind this effect is the fact that the magnetic field induced in the conductor by precessing spins, causing a current in it, which is recorded by the receiver, greatly increases with decreasing distance of the spins from the conductor. The fluorocarbons—octafluorocyclobutane gas—C<sub>4</sub>F<sub>8</sub>, as well as so-called dry water—perfluoro(2-methyl-3-pentanone)—CF<sub>3</sub>CF<sub>2</sub>C(O)CF(CF<sub>3</sub>)<sub>2</sub> can be used as a visualization medium. In both cases, MRI scan is performed to detect fluorine nuclei (<sup>19</sup>F). The method is most effective in active mode—when the coil to be examined is connected to the receiver. The application of the conductor visualization method was shown for three types of two-channel quadrature coils. The ability to visualize the conductors separately for each channel, including volumetric reconstructions, and to construct coil sensitivity maps was demonstrated. <sup>19</sup>F MR images of the coils were compared with their photographs, X-ray and proton MR images, and showed high correspondence.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 8","pages":"753 - 765"},"PeriodicalIF":1.1,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Deep Learning Framework for Accurate Intracranial Brain Hemorrhage Detection and Classification Using Real-Time Collected NCCT Images 利用实时采集的 NCCT 图像准确检测和分类颅内脑出血的新型深度学习框架

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-13 DOI: 10.1007/s00723-024-01661-z

Simarjeet Kaur, Amar Singh

{"title":"A New Deep Learning Framework for Accurate Intracranial Brain Hemorrhage Detection and Classification Using Real-Time Collected NCCT Images","authors":"Simarjeet Kaur, Amar Singh","doi":"10.1007/s00723-024-01661-z","DOIUrl":"10.1007/s00723-024-01661-z","url":null,"abstract":"<div><p>Brain hemorrhage is a critical medical condition that is likely to cause long-term disabilities and death. Timely and precise emergency care, incorporating the accurate interpretation of computed tomography (CT) images, plays a crucial role in the effective management of a hemorrhagic stroke. However, conventional artificial intelligence methods are capable enough to detect the presence or absence of hemorrhage but fail to detect multiple types of hemorrhage with high accuracy. To address this, the paper introduces an innovative Deep Learning based approach that automatically detects, segments, and classifies subtypes of intracranial hemorrhages. The proposed model is trained and evaluated on two different datasets. It is initially trained on a dataset of CT images from the Radiological Society of North America (RSNA) brain CT hemorrhage database, which contained 752,803 head non-contrast computer tomography images obtained from 2,200 patients. Furthermore, the model's performance is validated using a real-time CT dataset collected from a diagnostic lab, comprising 15,000 CT scan images from 176 patients. The proposed model surpasses standard benchmarks for detection and classification, achieving exceptional metrics. It showcases overall segmentation accuracy with a Dice score and Jaccard Index of 0.99 and 0.88 respectively, while the classification metrics include an accuracy of 0.99, precision, recall, and F1 score of 0.97, 0.98, and 0.97 respectively. When two expert radiologists independently assessed the predicted hemorrhage locations and subtypes, ensuring uniform specificity levels, they determined the observed rate of false positives per patient was less. These results validate its applicability as a dependable clinical decision support tool.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 6","pages":"629 - 661"},"PeriodicalIF":1.1,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141519280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-07 DOI: 10.1007/s00723-024-01647-x

К.M. Salikhov

{"title":"Similarities and Differences in the Effect of Dipole–Dipole and Exchange Interactions on the Shape of the EPR Spectrum of Dilute Solutions of Paramagnetic Particles","authors":"К.M. Salikhov","doi":"10.1007/s00723-024-01647-x","DOIUrl":"10.1007/s00723-024-01647-x","url":null,"abstract":"<div><p>Spin exchange caused by the exchange interaction during bimolecular collisions of paramagnetic particles in dilute solutions causes several effects: broadens the resonance lines of the EPR spectrum, changes the resonance frequencies, changes the shape of the resonance lines of the spectrum, and causes the effect of the exchange narrowing of the spectrum. The well-established belief is that the dipole–dipole interaction between paramagnetic particles only broadens the resonance lines. According to the new paradigm of spin exchange, the dipole–dipole interaction causes effects similar to the effects of spin exchange. In this article, a detailed quantitative analysis of the effect of the dipole–dipole interaction on the shape of the EPR spectra of dilute solutions of paramagnetic particles is carried out for the model system. It is shown that the contribution of the dipole–dipole interaction to the spin coherence transfer between particles makes it possible to more accurately determine the rate of spin exchange and, as a result, the rate of bimolecular collisions of molecules from the analysis of the shape of the EPR spectra. An experimental protocol is proposed that definitely highlights the contribution of the dipole–dipole interaction to the transfer of spin coherence.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 12","pages":"1587 - 1603"},"PeriodicalIF":1.1,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141370893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

NMR Spectroscopy as an Alternative Analytical Method for Biopolymers Without Chromophore: Example of Hyaluronic Acid in Dietary Supplements 核磁共振光谱法作为无色团生物聚合物的替代分析方法：以膳食补充剂中的透明质酸为例

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-06-05 DOI: 10.1007/s00723-024-01663-x

Fabienne M. Lang, Klaudia Adels, Bernd W. K. Diehl, Margit Schulze, Yulia B. Monakhova

{"title":"NMR Spectroscopy as an Alternative Analytical Method for Biopolymers Without Chromophore: Example of Hyaluronic Acid in Dietary Supplements","authors":"Fabienne M. Lang, Klaudia Adels, Bernd W. K. Diehl, Margit Schulze, Yulia B. Monakhova","doi":"10.1007/s00723-024-01663-x","DOIUrl":"10.1007/s00723-024-01663-x","url":null,"abstract":"<div><p>To respond to the increasing demand for hyaluronic acid (HA) in dietary supplements (DSs) and nutricosmetics marketed for the treatment of osteoarthritis or moistening, it is essential to have an accurate and reliable method for its analysis in the final products. The study aimed to develop and validate alternative method for the quality control of HA in DSs using low-field (LF) and high-field (HF) nuclear magnetic resonance (NMR) spectroscopy at 80 MHz and 600 MHz, respectively. Moreover, chondroitin sulphate (CH), another active ingredient in DSs, can be simultaneously quantified. The <sup>1</sup>H-NMR methods have been successfully validated in terms of limit of detection (LOD) and limit of quantitation (LOQ), which were found to be 0.1 mg/mL and 0.2 mg/mL (80 MHz) as well as 0.2 mg/mL and 0.6 mg/mL (600 MHz). Recovery rates were estimated to be between 92 and 120% on both spectrometers; precision including sample preparation was found to be 4.2% and 8.0% for 600 MHz and 80 MHz, respectively. Quantitative results obtained by HF and LF NMR were comparable for 16 DSs with varying matrix. HF NMR experiments at 70 ℃ serve as a simple and efficient quality control tool for HA and CH in multicomponent DSs. Benchtop NMR measurements, upon preceding acid hydrolysis, offer a cost-effective and cryogen-free alternative for analyzing DSs in the absence of CH and paramagnetic matrix components.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 7","pages":"687 - 700"},"PeriodicalIF":1.1,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-024-01663-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141382139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0