Journal of Magnetic Resonance, Series B最新文献_第7页

Multinuclear MR Frequency Shifts of Hydrated Ions as a Function of Applied Pressure and Temperature 水合离子的多核磁共振频移作为施加压力和温度的函数

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0131

Subhendra N. Sarkar , Harold W. Dodgen , John P. Hunt

引用次数: 2

An Optimized 3D NOESY–HSQC 优化的3D噪声- hsqc

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0132

Sekhar Talluri, Gerhard Wagner

引用次数: 145

Use of Amplitude and Frequency Transformations to Generate Adiabatic Pulses of Wide Bandwidth and Low RF Power Deposition 利用振幅和频率变换产生宽带宽和低射频功率的绝热脉冲沉积

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0123

Jun Shen

引用次数: 17

The Manipulation of Water Relaxation and Water Suppression in Biological Systems Using the Water-PRESS Pulse Sequence 利用水压脉冲序列操纵生物系统中的水松弛和水抑制

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0129

William S. Price , Yoji Arata

引用次数: 17

New Double-Quantum Filtering Schemes 新的双量子滤波方案

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0119

K.J. Jung , J.S. Tauskela , J. Katz

{"title":"New Double-Quantum Filtering Schemes","authors":"K.J. Jung , J.S. Tauskela , J. Katz","doi":"10.1006/jmrb.1996.0119","DOIUrl":"10.1006/jmrb.1996.0119","url":null,"abstract":"<div>New double-quantum filtering (DQF) schemes are theoretically developed by reformulating the equations describing the double-quantum (DQ) signal. The equations describing the second- and third-rank DQ signals are simplified by restricting the RF phases as required for DQF. The equations are then factorized into two terms representing the separate contribution to the DQ signal from the RF pulses involved in the preparation and evolution times. This allows analysis of the DQ signal of a particular DQF scheme separately for each of these times in a concise manner. By use of the reformulated equations, the conventional DQF scheme is shown to be only one of four possible DQF schemes. The three new DQF schemes offer some desirable properties over the conventional DQF scheme. In the conventional DQF scheme, the third-rank DQ signal declines rapidly to null as the flip angles of the creation and readout RF pulses deviate from 90° to 54.7° or 125.3°. In addition, the second- and third-rank DQ signals in the conventional DQF scheme are opposite in their polarities, resulting in attenuation of the total DQ signal due to destructive interference between them. In one of three new DQF schemes, the DQ signal does not vanish at 54.7° and 125.3°, but varies smoothly with the same functional dependence on the RF flip angles as the second-rank DQ and triple-quantum signals. Furthermore, in two of the three new DQF schemes, the second- and third-rank DQ signals have the same polarity so that the total DQ signal may be enhanced through constructive interference between them. These features of new DQF schemes have been confirmed experimentally.</div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 2","pages":"Pages 103-110"},"PeriodicalIF":0.0,"publicationDate":"1996-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19781206","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: 5

Detection of Different Water Populations in Brain Tissue Using2H Single- and Double-Quantum-Filtered Diffusion NMR Spectroscopy 利用2h单和双量子过滤扩散核磁共振光谱检测脑组织中不同的水群

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0125

Yaniv Assaf, Yoram Cohen

{"title":"Detection of Different Water Populations in Brain Tissue Using2H Single- and Double-Quantum-Filtered Diffusion NMR Spectroscopy","authors":"Yaniv Assaf, Yoram Cohen","doi":"10.1006/jmrb.1996.0125","DOIUrl":"10.1006/jmrb.1996.0125","url":null,"abstract":"<div>This paper presents the first simultaneous2H single- and double-quantum (SQ and DQ, respectively) diffusion study of excised brain tissue. The apparent diffusion coefficients (ADCs) of the2H SQ and DQ signals were measured at a fixed diffusion time (Δ − δ/3 = 21.3 ms) and as a function of the diffusion time to assess restricted diffusion [(Δ − δ/3) was changed from 21.3 to 271.3 ms]. As expected, the ADC of the SQ signal was higher than that of the DQ signal [0.53 ± 0.03 × 10−5(n= 3) and 0.30 ± 0.03 × 10−5cm2s−1(n= 4), respectively]. When the ADCs of the SQ and DQ signals were measured as a function of the diffusion time, two components, a fast and a slow component, were observed in each case. The ADCs for the SQ signal were 1.16 ± 0.2 × 10−5and 0.35 ± 0.06 × 10−5cm2s−1(n= 3) for the fast and the slow components, respectively. The ADCs for the DQ signal were 0.31 ± 0.05 × 10−5and ∼0.03 ± 0.03 × 10−5cm2s−1(n= 2) with the slow component being relatively small. Interestingly, the slow-diffusion component of the SQ signal was found to have an ADC similar to that of the fast component of the DQ signal. These results suggest that brain water can be divided into at least three water populations and that the DQ signal originates from water molecules which interact with slow-diffusing structural components of the brain. The new insights that one can obtain using simultaneous SQ and DQ diffusion measurement and the ability to distinguish among water populations in biological tissues using the above approach are discussed.</div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 2","pages":"Pages 151-159"},"PeriodicalIF":0.0,"publicationDate":"1996-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0125","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19781158","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: 34

Directed TOCSY, a Method for Selection of Directed Correlations by Optimal Combinations of Isotropic and Longitudinal Mixing 有向TOCSY:一种选择各向同性和纵向混合最优组合的有向相关性的方法

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0126

S.J. Glaser, H. Schwalbe, J.P. Marino, C. Griesinger

引用次数: 22

Estimation of Signal Intensities in 2D NMR Spectra with Severe Baseline Distortion by Combined Linear-Prediction and Least-Squares Analyses 结合线性预测和最小二乘分析估计具有严重基线失真的二维核磁共振光谱信号强度

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0130

Søren M. Kristensen , Morten Dahl Sørensen, Henrik Gesmar, Jens J. Led

引用次数: 7

SRS-FT, a Fourier Imaging Method Based on Sparse Radial Scanning and Bayesian Estimation SRS-FT是一种基于稀疏径向扫描和贝叶斯估计的傅里叶成像方法

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0121

D. Graveron-Demilly , G.J. Marseille , Y. Crémillieux , S. Cavassila , D. van Ormond

引用次数: 7

Correlation-Peak Imaging 相关峰成像

Journal of Magnetic Resonance, Series B Pub Date : 1996-08-01 DOI: 10.1006/jmrb.1996.0124

A. Ziegler , A. Metzler , W. Köckenberger , M. Izquierdo , E. Komor , A. Haase , M. Décorps , M. von Kienlin

{"title":"Correlation-Peak Imaging","authors":"A. Ziegler , A. Metzler , W. Köckenberger , M. Izquierdo , E. Komor , A. Haase , M. Décorps , M. von Kienlin","doi":"10.1006/jmrb.1996.0124","DOIUrl":"10.1006/jmrb.1996.0124","url":null,"abstract":"<div>Identification and quantitation in conventional1H spectroscopic imagingin vivois often hampered by the small chemical-shift range. To improve the spectral resolution of spectroscopic imaging, homonuclear two-dimensional correlation spectroscopy has been combined with phase encoding of the spatial dimensions. From the theoretical description of the coherence-transfer signal in the Fourier-transform domain, a comprehensive acquisition and processing strategy is presented that includes optimization of the width and the position of the acquisition windows, matched filtering of the signal envelope, and graphical presentation of the cross peak of interest. The procedure has been applied to image the spatial distribution of the correlation peaks from specific spin systems in the hypocotyl of castor bean (Ricinus communis) seedlings. Despite the overlap of many resonances, correlation-peak imaging made it possible to observe a number of proton resonances, such as those of sucrose, β-glucose, glutamine/glutamate, lysine, and arginine.</div>","PeriodicalId":16130,"journal":{"name":"Journal of Magnetic Resonance, Series B","volume":"112 2","pages":"Pages 141-150"},"PeriodicalIF":0.0,"publicationDate":"1996-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1006/jmrb.1996.0124","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19781157","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: 33