Effect of Cation Binding on the Proton Chemical Shifts and the Spin–Spin Coupling Constant of Citrate

Graaf, Marinette van der; Heerschap, Arend

doi:10.1006/jmrb.1996.0109

Cited by 42 publications

(39 citation statements)

References 2 publications

(2 reference statements)

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“…All the pH measurements were performed with Cyberscan 500 (Eutech Instruments) pH meter. Some metabolites contain acid or basic chemical groups and so, in solution, pH value determines whereas hydrogen nuclei are associated or not with acid (or basic) groups, affecting proton chemical shift values and J -modulation [24]. Choline chloride (≥98%, C7527 Sigma-Aldrich, St. Louis, MO, USA), sodium citrate dehydrate (≥99%, W302600 Sigma-Aldrich, St. Louis, MO, USA) and creatine monohydrate (≥98%, C3630 Sigma-Aldrich, St. Louis, MO, USA), were used respectively as Cho, Cit and Cr source.…”

Section: Methodsmentioning

confidence: 99%

MR Spectroscopy in Prostate Cancer: New Algorithms to Optimize Metabolite Quantification

et al. 2016

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Prostate cancer (PCa) is the most common non-cutaneous cancer in male subjects and the second leading cause of cancer-related death in developed countries. The necessity of a non-invasive technique for the diagnosis of PCa in early stage has grown through years. Proton magnetic resonance spectroscopy (1H-MRS) and proton magnetic resonance spectroscopy imaging (1H-MRSI) are advanced magnetic resonance techniques that can mark the presence of metabolites such as citrate, choline, creatine and polyamines in a selected voxel, or in an array of voxels (in MRSI) inside prostatic tissue. Abundance or lack of these metabolites can discriminate between pathological and healthy tissue. Although the use of magnetic resonance spectroscopy (MRS) is well established in brain and liver with dedicated software for spectral analysis, quantification of metabolites in prostate can be very difficult to achieve, due to poor signal to noise ratio and strong J-coupling of the citrate. The aim of this work is to develop a software prototype for automatic quantification of citrate, choline and creatine in prostate. Its core is an original fitting routine that makes use of a fixed step gradient descent minimization algorithm (FSGD) and MRS simulations developed with the GAMMA libraries in C++. The accurate simulation of the citrate spin systems allows to predict the correct J-modulation under different NMR sequences and under different coupling parameters. The accuracy of the quantifications was tested on measurements performed on a Philips Ingenia 3T scanner using homemade phantoms. Some acquisitions in healthy volunteers have been also carried out to test the software performance in vivo.

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Section: Methodsmentioning

confidence: 99%

MR Spectroscopy in Prostate Cancer: New Algorithms to Optimize Metabolite Quantification

et al. 2016

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“…The phantom contained 90 mM citrate, 61 mM potassium chloride, 18 mM calcium chloride, 14.7 mM magnesium chloride, 8.5 mM zinc chloride dissolved in a phosphate buffered saline (PBS) solution, adjusted to pH = 7, thereby resembling the composition of human prostatic fluid [12]. An additional 50 mM creatine was added to provide a singlet methyl signal for amplitude and phase reference.…”

Section: Methodsmentioning

confidence: 99%

Echo-time independent signal modulations for strongly coupled systems in triple echo localization schemes: An extension of S-PRESS editing

Kickler

Gambarota

Mekle

et al. 2010

Journal of Magnetic Resonance

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a b s t r a c tThe double spin-echo point resolved spectroscopy sequence (PRESS) is a widely used method and standard in clinical MR spectroscopy. Existence of important J-modulations at constant echo times, depending on the temporal delays between the rf-pulses, have been demonstrated recently for strongly coupled spin systems and were exploited for difference editing, removing singlets from the spectrum (strong-coupling PRESS, S-PRESS). A drawback of this method for in vivo applications is that large signal modulations needed for difference editing occur only at relatively long echo times. In this work we demonstrate that, by simply adding a third refocusing pulse (3S-PRESS), difference editing becomes possible at substantially shorter echo times while, as applied to citrate, more favorable lineshapes can be obtained. For the example of an AB system an analytical description of the MR signal, obtained with this triple refocusing sequence (3S-PRESS), is provided.

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“…This is possible if information is available on the chemical shifts of each singlet or multiplet group, J-couplings, field strength and the acquisition pulse sequence and its timing. For instance in the quantification of citrate levels in the human prostate from its methylene 1 H MR signals, the scalar coupling and the relative phase of the multiplet peaks were derived from in vitro measurements and quantum mechanical calculations 52,53 and used as prior knowledge. 39 A general approach for the formation of a priori knowledge by spectral simulation of metabolite spin systems has been described 54 and applied to automated spectral analysis of 1 H MR spectroscopic imaging data of the human brain.…”

Section: Use Of Prior Knowledgementioning

confidence: 99%

Common processing of in vivo MR spectra

Zandt¹,

Heerschap²

2001

NMR in Biomedicine

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This introductory article addresses approaches currently in use to process in vivo spectra. First, a brief overview is given of the information content represented by the parameters of MR signals. Subsequently, common steps in the processing of MR spectra such as pre-processing, normalisation and quantification and the use of prior knowledge are described. Finally, some prospects for more advanced processing are given.

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Effect of Cation Binding on the Proton Chemical Shifts and the Spin–Spin Coupling Constant of Citrate

Cited by 42 publications

References 2 publications

MR Spectroscopy in Prostate Cancer: New Algorithms to Optimize Metabolite Quantification

MR Spectroscopy in Prostate Cancer: New Algorithms to Optimize Metabolite Quantification

Echo-time independent signal modulations for strongly coupled systems in triple echo localization schemes: An extension of S-PRESS editing

Common processing of in vivo MR spectra

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