Applied Magnetic Resonance最新文献_第3页

Design of Inside-Out Magnetic Resonance Sensor Based on Coordinate Search Method 基于坐标搜索法设计内向外磁共振传感器

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-04-24 DOI: 10.1007/s00723-024-01649-9

Jiamin Wu, Zheng Xu, Yanhe Zhu, Yucheng He

{"title":"Design of Inside-Out Magnetic Resonance Sensor Based on Coordinate Search Method","authors":"Jiamin Wu, Zheng Xu, Yanhe Zhu, Yucheng He","doi":"10.1007/s00723-024-01649-9","DOIUrl":"10.1007/s00723-024-01649-9","url":null,"abstract":"<div>The application of inside-out magnetic resonance sensors has emerged as a focal point in soil moisture detection, offering a non-invasive approach crucial for evaluating soil physical structure. While existing inside-out magnetic resonance sensors with a unilateral structure can effectively measure the shallow soil layer, they fall short in assessing deeper soil layers (1–10 cm). However, the lack of optimal design and horizontal comparison among relevant sensors has impeded the widespread adoption of magnetic resonance sensors in soil moisture measurement. This paper addresses this gap by optimizing a magnetic resonance sensor with a dumbbell structure. The magnet structure is fine-tuned using a non-derivative optimization method, specifically the coordinate search, under practical engineering constraints to establish a uniform field in the region of interest. Employing the coordinate search method enhances the sensor’s relative signal-to-noise ratio (SNR) to its maximum. Artificial soil samples are then tested, and the T2 spectrum distribution reveals insights into water distribution characteristics across different pores.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 6","pages":"599 - 613"},"PeriodicalIF":1.1,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140664340","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

Development of Magnetic Resonance Imaging (MRI) Phantom With Arbitrary T1 Value Using Dextrin Hydrate 利用糊精水合物开发具有任意 T1 值的磁共振成像（MRI）模型

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-04-21 DOI: 10.1007/s00723-024-01655-x

Yusuke Sato, Daiki Ito, Norio Hayashi, Kouichi Ujita, Takayuki Suto, Haruyuki Watanabe, Yoshito Tsushima

{"title":"Development of Magnetic Resonance Imaging (MRI) Phantom With Arbitrary T1 Value Using Dextrin Hydrate","authors":"Yusuke Sato, Daiki Ito, Norio Hayashi, Kouichi Ujita, Takayuki Suto, Haruyuki Watanabe, Yoshito Tsushima","doi":"10.1007/s00723-024-01655-x","DOIUrl":"10.1007/s00723-024-01655-x","url":null,"abstract":"<div>To formulate the relationship between the dextrin hydrate concentration and T1 relaxation rate and create a magnetic resonance imaging (MRI) phantom with an arbitrary T1 value. Dextrin solution with nine different concentrations was prepared by dissolving 0–20 g (2.5 g increments) of dextrin in 25 g of purified water. The T1 values of the phantoms were measured using a 1.5 T MR scanner, and the relationship between the R1 value and dextrin concentration was regressed using linear and quadratic equations. Phantoms with concentrations adjusted to T1 values of 500, 1000, and 1500 ms were created from each regression equation, and the errors between the measured T1 and target values were evaluated. In addition, the temporal changes in the T1 and T2 values of the phantoms were also evaluated. The T1 and T2 values ranged from 367.4 ± 14.1 to 2577.6 ± 76.5 ms and 20.0 ± 0.9 to 1805.3 ± 8.3 ms, respectively. The linear and quadratic regression equations were (y=2.9631x+0.2043) and (y=1.8295{x}^{2}+1.4995x+0.37), with coefficients of determination of 0.9763 and 0.9954, respectively. The maximum errors were 12.3% and 2.1% for the linear and quadratic equations, respectively. The T1 value was maintained at a fluctuation rate of approximately 10% during the first 4 weeks. The T2 value decreased by approximately 20% after 4 weeks. MRI phantoms with arbitrary T1 values in the range of 500–1500 ms with an error within 2.1% can be created using dextrin, which can be used as human tissue-equivalent MRI phantoms for T1 of the grey or white matter of the brain, liver, pancreas, spleen, and prostate.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 5","pages":"497 - 507"},"PeriodicalIF":1.1,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628410","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

Experimental Studies of Power-Saturated Spin Modes of Nitroxides in Liquids 1 液体中氮氧化物功率饱和自旋模式的实验研究 1

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-04-19 DOI: 10.1007/s00723-024-01651-1

Barney L. Bales, Miroslav Peric, Robert N. Schwartz

引用次数: 0

Towards Routine 7Li In Situ Solid-State NMR Studies of Electrochemical Processes in Li|LiPF6|LFP Cells 对 Li|LiPF6|LFP 电池中的电化学过程进行常规 7Li 原位固态 NMR 研究

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-04-11 DOI: 10.1007/s00723-024-01643-1

Edina Šić, Dominion Fredericks, Oliver Pecher, Sebastian Wegner, Hergen Breitzke, Vickram Singh, Gerd Buntkowsky, Torsten Gutmann

引用次数: 0

13C MAS NMR Mechanistic Study of Propene Transformation on Silver-Modified ZSM-5 Zeolite in the Presence of Molecular Oxygen 分子氧存在下银改性 ZSM-5 沸石上丙烯转化的 13C MAS NMR 机制研究

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-04-08 DOI: 10.1007/s00723-024-01652-0

Zoya N. Lashchinskaya, Anton A. Gabrienko, Alexander V. Toktarev, Alexander G. Stepanov

{"title":"13C MAS NMR Mechanistic Study of Propene Transformation on Silver-Modified ZSM-5 Zeolite in the Presence of Molecular Oxygen","authors":"Zoya N. Lashchinskaya, Anton A. Gabrienko, Alexander V. Toktarev, Alexander G. Stepanov","doi":"10.1007/s00723-024-01652-0","DOIUrl":"10.1007/s00723-024-01652-0","url":null,"abstract":"<div>Silver-modified zeolites have demonstrated promising properties for hydrocarbon feedstock valorization and the oxidation of organic compounds. Within the frame of the scientific interest for selective oxidation of light alkenes on metal-modified zeolites, the transformation of propene on Ag/H-ZSM-5 zeolite in the presence of molecular oxygen has been monitored by 13C (CP) MAS NMR spectroscopy at 296–773 K. Silver-allyl intermediate species have been detected by 13C CP/MAS NMR, indicating that Ag+ sites are involved in propene transformation. It is assumed that oxygen and propene compete for the Ag+ adsorption sites, thus prompting propene adsorption on zeolite Brønsted acid sites (BAS) and its further transformation by oligomerization and conjunct polymerization. Among the products of propene oxidation by molecular oxygen, only carbon dioxide has been detected by 13C MAS NMR, implying high activity of Ag/H-ZSM-5 in alkene total oxidation. It is thus inferred that silver-modified zeolite is not a promising catalyst for propene selective oxidation to propene oxide and carbonyl group containing organics.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 10","pages":"1263 - 1274"},"PeriodicalIF":1.1,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140578045","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

Spin-Wave Model of Free Induction Decay in Ring Spin Cluster 环状自旋簇自由感应衰变的自旋波模型

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-03-28 DOI: 10.1007/s00723-024-01650-2

Kirill Tsiberkin, Ekaterina Kovycheva

引用次数: 0

EPR Investigation of Gamma-Irradiated Tiopronin 伽马辐照硫普罗宁的 EPR 研究

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-03-28 DOI: 10.1007/s00723-024-01645-z

Kerem Sütçü, Yunus Emre Osmanoğlu

引用次数: 0

Dynamic Viscosity of Blood Serum Determined Using Proton Magnetic Relaxation 利用质子磁弛豫测定血清的动态粘度

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-03-22 DOI: 10.1007/s00723-024-01644-0

Yulianela Mengana Torres, Manuel Arsenio Lores Guevara, Hugo Ferrales Milán, Lidia Clara Suárez Beyries, Samuel Jorge Rosales Rodríguez, Inocente Rodríguez Reyes, Juan Carlos García Naranjo, Yamirka Alonso Geli

{"title":"Dynamic Viscosity of Blood Serum Determined Using Proton Magnetic Relaxation","authors":"Yulianela Mengana Torres, Manuel Arsenio Lores Guevara, Hugo Ferrales Milán, Lidia Clara Suárez Beyries, Samuel Jorge Rosales Rodríguez, Inocente Rodríguez Reyes, Juan Carlos García Naranjo, Yamirka Alonso Geli","doi":"10.1007/s00723-024-01644-0","DOIUrl":"10.1007/s00723-024-01644-0","url":null,"abstract":"<div>An experimental procedure, based on proton magnetic relaxation, is presented to determine the absolute dynamic viscosity in blood serum (ηS). The blood serum samples were obtained voluntary from whole blood of healthy individuals and patients, and processed by classical methods (centrifugation and decanting). The Carr–Purcell–Meiboom–Gill pulse sequence was employed to determine the transverse proton magnetic relaxation time (T2) in a Tecmag Magnetic Resonance console coupled to a magnet of 0.095 T and the temperature of measurement was 293 K. A theoretical linear behavior of the transverse proton magnetic relaxation rate (1/T2) as a function of ηS was obtained after the consideration of blood serum as an extremely diluted solution of albumin and globulins, and assuming a fast exchange of water molecules between the bound phase and the solvent. A value of ηS = 1.29 ± 0.07 mPa s was obtained in samples belonging to 20 voluntary healthy individuals, which statistically match with the value obtained using the Ostwald viscometer for the same samples (ηS = 1.32 ± 0.04 mPa s, P = 0.104319 > 0.05, α = 0.05). The potential medical utility of the presented proton magnetic resonance procedure was demonstrated in patients with Multiple Myeloma (24) and Sickle Cell Disease (34), in which ηS resulted increased with values of 1.40 ± 0.18 mPa s (P = 0.0137509 < 0.05, α = 0.05) and 1.36 ± 0.10 mPa s (P = 0.00809615 < 0.05, α = 0.05), respectively.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 5","pages":"527 - 536"},"PeriodicalIF":1.1,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140202236","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

Motion Corrected DCE-MR Image Reconstruction Using Deep Learning 利用深度学习进行运动校正的 DCE-MR 图像重建

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-03-11 DOI: 10.1007/s00723-024-01642-2

Taquwa Aslam, Faisal Najeeb, Hassan Shahzad, Madiha Arshad, Hammad Omer

{"title":"Motion Corrected DCE-MR Image Reconstruction Using Deep Learning","authors":"Taquwa Aslam, Faisal Najeeb, Hassan Shahzad, Madiha Arshad, Hammad Omer","doi":"10.1007/s00723-024-01642-2","DOIUrl":"10.1007/s00723-024-01642-2","url":null,"abstract":"<div>Respiratory motion in abdomen generates motion artifacts during Dynamic Contrast Enhanced MRI (DCE-MRI) data acquisition and it is clinically challenging to minimize the motion artifacts. Extraction of self-gated respiratory signal from the acquired k-space data is one of the methods to deal with the respiratory motion artifacts. The literature shows that non-Cartesian trajectories are less sensitive to motion artifacts than Cartesian trajectories. Golden-angle data acquisition in radial trajectory is preferred to extract the self-gated signal that splits the free-breathing data into different respiratory phases; also called motion states or bins. Conventionally, XD-GRASP (eXtra-Dimension golden-angle-radial Sparse Parallel MRI) reconstructs the binned data, but this method has limitations such as it does not preserve noise like texture (MR images have noise like artifacts) and it is a computationally intensive method. This research work proposes the use of a dedicated Convolutional Neural Network (CNN) architecture to remove motion artifacts from the binned (using uniform and adaptive binning) DCE golden-angle-radial liver perfusion data. The results of the proposed method are compared with XD-GRASP reconstruction. The results demonstrate that the proposed method takes significantly less computation time and provides similar quality of the reconstructed images as compared to the XD-GRASP method. Furthermore, receiver coil sensitivity information is required in XD-GRASP to reconstruct the MR image that may be difficult to estimate in some applications, whereas the proposed method does not require any such information.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 5","pages":"509 - 526"},"PeriodicalIF":1.1,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140124990","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 Study to Identify and Analyze the Radiosensitivity of 4-Piperidinecarboxylic Acid Using Electron Paramagnetic Resonance Spectroscopy 利用电子顺磁共振波谱鉴别和分析 4-哌啶甲酸辐射敏感性的研究

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2024-02-01 DOI: 10.1007/s00723-024-01641-3

Kerem Sütçü

{"title":"A Study to Identify and Analyze the Radiosensitivity of 4-Piperidinecarboxylic Acid Using Electron Paramagnetic Resonance Spectroscopy","authors":"Kerem Sütçü","doi":"10.1007/s00723-024-01641-3","DOIUrl":"10.1007/s00723-024-01641-3","url":null,"abstract":"<div>This study aims to investigate the spectroscopic, dosimetric, and stability properties of free radicals generated within 4-piperidinecarboxylic acid (4PCA) sample due to gamma irradiation within the 2–20 kGy range, utilizing electron paramagnetic resonance (EPR) spectroscopy. To achieve this goal, the EPR signals of the samples were studied in relation to microwave power, ranging from 0.01 to 50 mW, at room temperature. The investigation revealed that γ-irradiation induces the formation of –CH2ĊCH2CH2– (radical I) and –ĊHN– (radical II) radicals within the 4PCA compound. Hyperfine structure constants and g values were also determined for the radicals. The optimal agreement between experimental and computed results within the dose range of 2–20 kGy was achieved using polynomial and linear functions. Experimental measurements were undertaken under varied temperature conditions (123–323 K) to study the dosimetric features of free radicals generated as a consequence of gamma irradiation. Furthermore, an investigation into the time dependency of signal intensity within the irradiated sample was conducted, with the objective of analyzing the long-term stability characteristics of the free radicals present.</div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 5","pages":"537 - 549"},"PeriodicalIF":1.1,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139669551","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