Abstract：
:Transceiver surface coil arrays improve transmit performance (B1/√kW) and B1 homogeneity for head imaging up to 9.4 T. To further improve reception performance and parallel imaging, the number of array elements must be increased with a corresponding decrease in their size. With a large number of small interacting antennas, decoupling is one of the most challenging aspects in the design and construction of transceiver arrays. Previously described decoupling techniques using geometric overlap, inductive or capacitive decoupling have focused on the elimination of the reactance of the mutual impedance only, which can limit the obtainable decoupling to -10 dB as a result of residual mutual resistance. A novel resonant inductive decoupling (RID) method, which allows compensation for both reactive and resistive components of the mutual impedance between the adjacent surface coils, has been developed and verified experimentally. This method provides an easy way to adjust the decoupling remotely by changing the resonance frequency of the RID circuit through the adjustment of a variable capacitor. As an example, a single-row (1 × 16) 7-T transceiver head array of n = 16 small overlapped surface coils using RID decoupling between adjacent coils was built. In combination with overlapped coils, the RID technique achieved better than -24 dB of decoupling for all adjacent coils.
journal_name
NMR Biomedjournal_title
NMR in biomedicineauthors
Avdievich NI,Pan JW,Hetherington HPdoi
10.1002/nbm.2989subject
Has Abstractpub_date
2013-11-01 00:00:00pages
1547-54issue
11eissn
0952-3480issn
1099-1492journal_volume
26pub_type
杂志文章abstract：:In this methodological paper I report the stereotactic correlation of different magnetic resonance imaging (MRI) techniques [MR angiography (MRA), MRI, blood bolus tagging (STAR), functional MRI, and high-resolution BOLD venography (HRBV)] in patients with cerebral arterio-venous malformations (AVM) and brain tumors. ...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.714
更新日期：2001-11-01 00:00:00
abstract：:During magnetic resonance imaging (MRI) examinations, the average specific absorption rate (SAR) of the whole body is calculated as an index of global energy deposition in biological tissue without taking into account the presence of metallic implants or conductive materials. However, this global SAR calculation is no...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3849
更新日期：2018-01-01 00:00:00
abstract：:The aim of the study was to establish the normal range and to evaluate the reproducibility of dynamic contrast enhanced MRI (DCE-MRI) parameter estimates in normal human pelvic tissues. Nineteen patients with prostate cancer, undergoing androgen deprivation treatment, had paired DCE-MRI examinations of the pelvis usin...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.732
更新日期：2002-04-01 00:00:00
abstract：:Wilms' tumours (WTs) are large heterogeneous tumours, which typically consist of a mixture of histological cell types, together with regions of chemotherapy-induced regressive change and necrosis. The predominant cell type in a WT is assessed histologically following nephrectomy, and used to assess the tumour subtype ...
journal_title：NMR in biomedicine
pub_type： 临床试验,杂志文章
doi：10.1002/nbm.3337
更新日期：2015-08-01 00:00:00
abstract：:The accuracy and precision of the quantification of metabolite concentrations in in vivo (1) H NMR spectroscopy are affected by linewidth and signal-to-noise ratio (SNR). To study the effect of both factors in in vivo (1) H NMR spectra acquired at ultrahigh field, a reference spectrum was generated by summing nine in ...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.2821
更新日期：2013-01-01 00:00:00
abstract：:A special characteristic of the brain is the usage of lactate as alternative fuel instead of glucose to preserve its energy homeostasis. This physiological function is valid for sufficient cerebral glucose supply, as well as presumably during hypoglycemia, given that exogenous lactate infusion suppresses hormonal coun...
journal_title：NMR in biomedicine
pub_type： 杂志文章,随机对照试验
doi：10.1002/nbm.4167
更新日期：2019-11-01 00:00:00
abstract：:Encoding of spatial information in magnetic resonance imaging is conventionally accomplished by using magnetic field gradients. During gradient encoding, the position in k-space is determined by a time-integral of the gradient field, resulting in a limitation in imaging speed due to either gradient power or secondary ...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.1399
更新日期：2009-11-01 00:00:00
abstract：:The intimal and medial linings of the pulmonary artery consist largely of vascular endothelial cells (VECs) and vascular smooth muscle cells (VSMCs), respectively. The migration of these cell types to a potential tissue-engineered pulmonary valve (TEPV) implant process is therefore of interest in understanding the val...
journal_title：NMR in biomedicine
pub_type： 杂志文章,评审
doi：10.1002/nbm.1642
更新日期：2012-03-01 00:00:00
abstract：:An outline is presented of metabolite-specific in vivo NMR spectroscopy (particularly in brain). It reviews from a physical spectroscopist's perspective, the need for and the methods of observation of, individual metabolite resonances. ...
journal_title：NMR in biomedicine
pub_type： 杂志文章,评审
doi：10.1002/(sici)1099-1492(199712)10:8<435::aid-nbm48
更新日期：1997-12-01 00:00:00
abstract：:The aim of this study was to investigate physiological variations of the water T2 relaxation time in vertebral bone marrow with respect to age, body mass index (BMI), sex and proton density fat fraction (PDFF) based on single-voxel magnetic resonance spectroscopy (MRS) at 3 T. Multi-TE single-voxel STEAM MRS data of a...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.4439
更新日期：2020-11-17 00:00:00
abstract：:MRI and MRS in small rodents demand very high sensitivity. Cryogenic transmit/receive radiofrequency probes (CryoProbes) designed for (1) H MRI of mouse brain provide an attractive option for increasing the performance of small-animal MR systems. As the Larmor frequency of (13) C nuclei is four times lower than that f...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3110
更新日期：2014-06-01 00:00:00
abstract：:Given the importance of genetically modified mice in studies of mammalian brain development and human congenital brain diseases, MRI has the potential to provide an efficient in vivo approach for analyzing mutant phenotypes in the early postnatal mouse brain. The combination of reduced tissue contrast at the high magn...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.932
更新日期：2004-12-01 00:00:00
abstract：:γ-Aminobutyric acid (GABA) and glutamate (Glu), major neurotransmitters in the brain, are recycled through glutamine (Gln). All three metabolites can be measured by magnetic resonance spectroscopy in vivo, although GABA measurement at 3 T requires an extra editing acquisition, such as Mescher-Garwood point-resolved sp...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3847
更新日期：2018-01-01 00:00:00
abstract：:Chemical exchange saturation transfer (CEST)-derived, pH-weighted, amide proton transfer (APT) MRI has shown promise in animal studies for the prediction of infarction risk in ischemic tissue. Here, APT MRI was translated to patients with acute stroke (1-24 h post-symptom onset), and assessments of APT contrast, perfu...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3048
更新日期：2014-02-01 00:00:00
abstract：:A recent analysis of the optimization of magnetization transfer experiments to estimate first-order rate constants is extended to the design of experiments for measuring these constants and T1 when both parameters are initially unknown. When the number of measurement times is fixed, an optimal design will consist of a...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/(SICI)1099-1492(199605)9:3<135::AID-NBM404
更新日期：1996-05-01 00:00:00
abstract：:The application of diffusion tensor imaging (DTI) to the evaluation of developing brain remains an area of active investigation. This review focuses on the changes in DTI parameters which accompany both brain maturation and injury. The two primary pieces of information available from DTI studies-water apparent diffusi...
journal_title：NMR in biomedicine
pub_type： 杂志文章,评审
doi：10.1002/nbm.784
更新日期：2002-11-01 00:00:00
abstract：:With a fixed time to acquire a magnetic resonance (MR) image, time can be spent to acquire better spatial resolution with decrease in signal-to-noise ratio (SNR) or decreased resolution with increase in SNR. This resolution/SNR tradeoff at fixed time has been investigated by a visual rater study using images of ex viv...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.1359
更新日期：2009-06-01 00:00:00
abstract：:The potential use of 13C multilabeled substrates has been studied in biological applications using in vivo and in vitro proton and 13C NMR spectroscopy. In 13C NMR spectroscopy, multilabeled compounds allow the simultaneous observation of several nuclei or increase distinctly the signal to noise ratio due to a higher ...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.1940020516
更新日期：1989-12-01 00:00:00
abstract：:In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of NMR in biomedicine. Each bibliography is divided into 9 sections: 1 Books, Re...
journal_title：NMR in biomedicine
pub_type：
doi：10.1002/nbm.667
更新日期：2001-02-01 00:00:00
abstract：:In the unstimulated brain energy is primarily supplied by the oxidation of glucose. However the oxygen-to-glucose index (OGI), which is the ratio of metabolic rates of oxygen to glucose, CMR(O2)/CMR(glc), diverges from the theoretical value of 6 as activity is increased. In vivo measurements of brain lactate show its ...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.741
更新日期：2001-11-01 00:00:00
abstract：:The progression of Parkinson's disease (PD) seems to vary according to the disease stage, which greatly influences the management of PD patients. However, the underlying mechanism of progression in PD remains unclear. This study was designed to explore the progressive pattern of iron accumulation at different stages i...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3489
更新日期：2017-04-01 00:00:00
abstract：:In recent years, quantitative nuclear magnetic resonance imaging and spectroscopy (NMRI and NMRS) have been used more systematically as outcome measures in natural history and clinical trial studies for Duchenne muscular dystrophy (DMD). Whereas most of these studies have emphasized the evaluation of the fat fraction ...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3839
更新日期：2018-01-01 00:00:00
abstract：:The purpose of this work was to carry out diffusion tensor imaging (DTI) at multiple diffusion times Td in skeletal muscle in normal subjects and chronic exertional compartment syndrome (CECS) patients and analyze the data with the random permeable barrier model (RPBM) for biophysical specificity. Using an institution...
journal_title：NMR in biomedicine
pub_type： 临床试验,杂志文章
doi：10.1002/nbm.3087
更新日期：2014-05-01 00:00:00
abstract：:The ability to assess the perfusion territories of major cerebral arteries can be a valuable asset to the diagnosis of a number of cerebrovascular diseases. Recently, several arterial spin labeling (ASL) techniques have been proposed for determining the cerebral perfusion territories of individual arteries by three di...
journal_title：NMR in biomedicine
pub_type： 杂志文章,评审
doi：10.1002/nbm.1177
更新日期：2007-11-01 00:00:00
abstract：:The purpose of this work was to harmonize data acquisition and post-processing of single voxel proton MRS ((1) H-MRS) at 7 T, and to determine metabolite concentrations and the accuracy and reproducibility of metabolite levels in the adult human brain. This study was performed in compliance with local institutional hu...
journal_title：NMR in biomedicine
pub_type： 杂志文章,多中心研究
doi：10.1002/nbm.3252
更新日期：2015-03-01 00:00:00
abstract：:This study investigated the association between the total choline (tCho) concentration and the clinical characteristics and biomarker status of breast cancer. Sixty-two patients with breast cancer, 1.5 cm or larger in size on MR images, were studied. The tCho concentration was correlated with the MRI features, contra...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.1595
更新日期：2011-04-01 00:00:00
abstract：:The purpose of this paper is to facilitate the comparison of magnetic resonance (MR) spectra acquired from unknown brain lesions with published spectra in order to help identify unknown lesions in clinical settings. The paper includes lists of references for published MR spectra of various brain diseases, including py...
journal_title：NMR in biomedicine
pub_type： 杂志文章,评审
doi：10.1002/nbm.1039
更新日期：2006-06-01 00:00:00
abstract：:The use of cerebral water as an internal intensity standard for the quantitation of spatially localized proton spectra of the human brain is investigated. The method is validated on standard samples of N-acetyl aspartate (NAA) and lactate, and possible sources of error are discussed. Using the STEAM pulse sequence, co...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.1940060114
更新日期：1993-01-01 00:00:00
abstract：:Resolution enhancement for glutamate (Glu), glutamine (Gln) and glutathione (GSH) in the human brain by TE-optimized point-resolved spectroscopy (PRESS) at 7 T is reported. Sub-TE dependences of the multiplets of Glu, Gln, GSH, γ-aminobutyric acid (GABA) and N-acetylaspartate (NAA) at 2.2-2.6 ppm were investigated wit...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.1529
更新日期：2010-11-01 00:00:00
abstract：:Increased lactate production through glycolysis in aerobic conditions is a hallmark of cancer. Some anticancer drugs have been designed to exploit elevated glycolysis in cancer cells. For example, lonidamine (LND) inhibits lactate transport, leading to intracellular acidification in cancer cells. Chemical exchange sat...
journal_title：NMR in biomedicine
pub_type： 杂志文章
doi：10.1002/nbm.3287
更新日期：2015-05-01 00:00:00
