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Journal of Magnetic Resonance, Series B最新文献

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Indirect Estimation of Lens Protein Dynamics via Magnetization Transfer 通过磁化转移间接估计透镜蛋白动力学
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0170
Hong N. Yeung , Der-Lii Tzou , Shu Ming Lee , Fu-Yung Huang , Yur Hur
{"title":"Indirect Estimation of Lens Protein Dynamics via Magnetization Transfer","authors":"Hong N. Yeung , Der-Lii Tzou , Shu Ming Lee , Fu-Yung Huang , Yur Hur","doi":"10.1006/jmrb.1996.0170","DOIUrl":"10.1006/jmrb.1996.0170","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 167-171"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0170","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Absolute Quantification of Phospholipid Metabolites in Brain-Tissue Extracts by1H NMR Spectroscopy 脑组织提取物中磷脂代谢物的1h NMR绝对定量研究
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0174
Mika Ala-Korpela , Pirjo Posio , Sampo Mattila , Ari Korhonen , Stephen R. Williams
{"title":"Absolute Quantification of Phospholipid Metabolites in Brain-Tissue Extracts by1H NMR Spectroscopy","authors":"Mika Ala-Korpela , Pirjo Posio , Sampo Mattila , Ari Korhonen , Stephen R. Williams","doi":"10.1006/jmrb.1996.0174","DOIUrl":"10.1006/jmrb.1996.0174","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 184-189"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
Gradient-Echo Imaging Considerations for Hyperpolarized129Xe MR 超极化129xe MR的梯度回波成像考虑
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0173
Lei Zhao , Robert Mulkern , Ching-Hua Tseng , Daniel Williamson , Samuel Patz , Robert Kraft , Ronald L. Walsworth , Ferenc A. Jolesz , Mitchell S. Albert
{"title":"Gradient-Echo Imaging Considerations for Hyperpolarized129Xe MR","authors":"Lei Zhao , Robert Mulkern , Ching-Hua Tseng , Daniel Williamson , Samuel Patz , Robert Kraft , Ronald L. Walsworth , Ferenc A. Jolesz , Mitchell S. Albert","doi":"10.1006/jmrb.1996.0173","DOIUrl":"10.1006/jmrb.1996.0173","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 179-183"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0173","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82833110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 184
Temperature Dependence of NMR Relaxation Times of Nucleoside Triphosphates and Inorganic Phosphate in the Isolated Perfused Rat Liver. Effect on Pi Compartmentation 三磷酸核苷和无机磷酸盐在离体灌注大鼠肝脏中核磁共振弛豫时间的温度依赖性。对Pi区隔的影响
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0165
Sylvie Dufour, Eric Thiaudière, Giovanni Vidal, Jean-Louis Gallis, Nicole Rousse, Paul Canioni
{"title":"Temperature Dependence of NMR Relaxation Times of Nucleoside Triphosphates and Inorganic Phosphate in the Isolated Perfused Rat Liver. Effect on Pi Compartmentation","authors":"Sylvie Dufour,&nbsp;Eric Thiaudière,&nbsp;Giovanni Vidal,&nbsp;Jean-Louis Gallis,&nbsp;Nicole Rousse,&nbsp;Paul Canioni","doi":"10.1006/jmrb.1996.0165","DOIUrl":"10.1006/jmrb.1996.0165","url":null,"abstract":"<div><p>The effect of temperature on<sup>31</sup>P NMR spectra from isolated perfused rat livers was studied at 9.4 T. Relaxation times (<em>T</em><sub>1</sub>and<em>T</em><sub>2</sub>) of nucleoside triphosphates (NTP) and inorganic phosphate (Pi) were determined at 37, 25, 15, and 4°C. Under hypothermic conditions, an unexpected apparent line sharpening in the Pi spectral region and a clear emergence of an additional Pi resonance were observed. This additional signal was assigned to mitochondrial Pi.<em>T</em><sub>1</sub>values obtained for cytosolic and mitochondrial Pi at 4°C were 1.14 ± 0.24 s (<em>n</em>= 5) and 0.71 ± 0.18 s (<em>n</em>= 5), respectively. No significant mitochondrial contribution to the Pi resonance was observed at 37°C. Quantification of Pi and NTP liver contents at 37 and 4°C was performed by comparing the perfused liver spectrum and the corresponding perchloric acid extract spectrum. Under experimental conditions of low external Pi (0.12 m<em>M</em>), it was concluded that intracellular Pi was completely NMR-visible at 4 and 37°C. The observation of the mitochondrial Pi signal at 4°C was well explained by an increase in the Pi level within the matrix, in response to the mitochondrial swelling induced by hypothermia, as observed by electron microscopy.<em>T</em><sub>2</sub>values for the cytosolic Pi at 37 and 4°C were 17 ± 4 ms (<em>n</em>= 8) and 22 ± 4 ms (<em>n</em>= 10), respectively. Comparison with measured linewidths indicated that line broadening for the main phosphorylated metabolites—including matrix Pi—was the result of<em>B</em><sub>0</sub>field inhomogeneity. The additional broadening of the cytosolic Pi resonance at 4 and 37°C was attributed to pH heterogeneity within the liver.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 125-135"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0165","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Double-Sampled Echo-Planar Imaging at 3 Tesla 3特斯拉双采样回波平面成像
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0167
Qing X. Yang , Stefan Posse , Denis Le Bihan , Michael B. Smith
{"title":"Double-Sampled Echo-Planar Imaging at 3 Tesla","authors":"Qing X. Yang ,&nbsp;Stefan Posse ,&nbsp;Denis Le Bihan ,&nbsp;Michael B. Smith","doi":"10.1006/jmrb.1996.0167","DOIUrl":"10.1006/jmrb.1996.0167","url":null,"abstract":"<div><p>A persistent artifact in the images acquired by the echo-planar imaging (EPI) method is the Nyquist or N/2 ghost which interferes with the image and reduces the signal-to-noise ratio (SNR). The Nyquist ghost is the result of the time-reversal asymmetry between the even and odd echoes. To eliminate this artifact, the authors present a double-sampled EPI (DSEPI) method in which echoes from each even and odd echo pair are equally phase encoded. The even and odd echoes are separately reconstructed into two distinct images which are then added together. The DSEPI method has been applied to human brain at 3.0 T and shown to be a simple and effective way to eliminate the Nyquist ghost and restore image SNR loss.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 145-150"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Indirect Referencing of31P and19F NMR Spectra 31p和19f核磁共振谱的间接参考
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0172
Till Maurer, Hans Robert Kalbitzer
{"title":"Indirect Referencing of31P and19F NMR Spectra","authors":"Till Maurer,&nbsp;Hans Robert Kalbitzer","doi":"10.1006/jmrb.1996.0172","DOIUrl":"10.1006/jmrb.1996.0172","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 177-178"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0172","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19916792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 45
Improved Processing of Selective NMR Spectra of Biopolymers by Separation of Noise and Signal Subspaces through Singular-Value Decomposition 利用奇异值分解分离噪声和信号子空间改进生物聚合物选择性核磁共振谱处理
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0169
Mauro Fedrigo, Federico Fogolari, Paolo Viglino, Gennaro Esposito
{"title":"Improved Processing of Selective NMR Spectra of Biopolymers by Separation of Noise and Signal Subspaces through Singular-Value Decomposition","authors":"Mauro Fedrigo,&nbsp;Federico Fogolari,&nbsp;Paolo Viglino,&nbsp;Gennaro Esposito","doi":"10.1006/jmrb.1996.0169","DOIUrl":"10.1006/jmrb.1996.0169","url":null,"abstract":"<div><p>A novel sensitivity-enhancement procedure is introduced for 2D NMR data matrices. It is based on the separation of the signal-and-noise subspaces by means of singular-value decomposition of the experimental 2D array. Although no theoretical limitation exists for a general application of the method, the reliability of the results increases considerably with reduced data sets such as those of selective measurements. Advantageous applications can be envisaged for the quantitation of NMR parameters in biopolymers whose linewidths are often large enough to undermine severely the sensitivity of selective experiments.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 160-166"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Mapping of the Magnetic-Field Distribution in Cancellous Bone 松质骨磁场分布的测绘
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0171
Hsiao-Wen Chung , Scott N. Hwang , Hong N. Yeung , Felix W. Wehrli
{"title":"Mapping of the Magnetic-Field Distribution in Cancellous Bone","authors":"Hsiao-Wen Chung ,&nbsp;Scott N. Hwang ,&nbsp;Hong N. Yeung ,&nbsp;Felix W. Wehrli","doi":"10.1006/jmrb.1996.0171","DOIUrl":"10.1006/jmrb.1996.0171","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 172-176"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0171","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19911194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Optimal Measurement of Magnitude and Phase from MR Data 从MR数据中进行幅度和相位的最佳测量
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01 DOI: 10.1006/jmrb.1996.0166
Jean-Marie Bonny , Jean-Pierre Renou , Michel Zanca
{"title":"Optimal Measurement of Magnitude and Phase from MR Data","authors":"Jean-Marie Bonny ,&nbsp;Jean-Pierre Renou ,&nbsp;Michel Zanca","doi":"10.1006/jmrb.1996.0166","DOIUrl":"10.1006/jmrb.1996.0166","url":null,"abstract":"<div><p>General expressions of magnitude- and phase-probability distributions of MRI signals are presented and discussed. From these expressions, maximum-likelihood estimators are derived that allow optimal measurement of true magnitude and true phase from a set of noisy samples. Bias and uncertainty of estimates are determined by Monte Carlo simulations. It is demonstrated that with 100 samples and for signal-to-noise ratios above 1, bias and uncertainty of ML estimates are approximately 1 and 3% for magnitude and 0.1 and 5% for phase, respectively.</p></div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"Pages 136-144"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0166","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19916790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
Gradient-Echo Imaging Considerations for Hyperpolarized 129Xe MR 超极化129Xe MR的梯度回波成像考虑
Journal of Magnetic Resonance, Series B Pub Date : 1996-11-01
Zhao, Mulkern, Tseng, Williamson, Patz, Kraft, Walsworth, Jolesz, Albert
{"title":"Gradient-Echo Imaging Considerations for Hyperpolarized 129Xe MR","authors":"Zhao,&nbsp;Mulkern,&nbsp;Tseng,&nbsp;Williamson,&nbsp;Patz,&nbsp;Kraft,&nbsp;Walsworth,&nbsp;Jolesz,&nbsp;Albert","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"113 2","pages":"179-83"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19916793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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