@article {257, title = {Band-selective chemical exchange saturation transfer imaging with hyperpolarized xenon-based molecular sensors}, journal = {Journal of Magnetic Resonance}, volume = {213}, year = {2011}, note = {J Magn Reson847UKTimes Cited:3Cited References Count:29}, month = {Dec}, pages = {14-21}, abstract = {

Molecular imaging based on saturation transfer in exchanging systems is a tool for amplified and chemically specific magnetic resonance imaging. Xenon-based molecular sensors are a promising category of molecular imaging agents in which chemical exchange of dissolved xenon between its bulk and agent-bound phases has been use to achieve sub-picomolar detection sensitivity. Control over the saturation transfer dynamics, particularly when multiple exchanging resonances are present in the spectra, requires saturation fields of limited bandwidth and is generally accomplished by continuous wave irradiation. We demonstrate instead how band-selective saturation sequences based on multiple pulse inversion elements can yield saturation bandwidth tuneable over a wide range, while depositing less RF power in the sample. We show how these sequences can be used in imaging experiments that require spatial-spectral and multispectral saturation. The results should be applicable to all CEST experiments and, in particular, will provide the spectroscopic control required for applications of arrays of xenon chemical sensors in microfluidic chemical analysis devices. (C) 2011 Elsevier Inc. All rights reserved.

}, keywords = {xe-129}, isbn = {1090-7807}, doi = {Doi 10.1016/J.Jmr.2011.06.027}, url = {://WOS:000296997800002}, author = {Meldrum, T. and Bajaj, V. S. and Wemmer, D. E. and Pines, A.} } @article {341, title = {Broadband phase modulation by adiabatic pulses}, journal = {Journal of Magnetic Resonance}, volume = {164}, year = {2003}, note = {J Magn Reson717NCTimes Cited:14Cited References Count:14}, month = {Sep}, pages = {177-181}, abstract = {

The use of inhomogeneous but spatially correlated static and radiofrequency (RF) magnetic fields offers a potential methodology for performing magnetic resonance spectroscopy of samples placed outside the bore of the magnet. However, its practical implementation still presents challenging problems, among them the control of nuclear spins over broad frequency offset intervals. The present study introduces an efficient method of encoding the phase of the magnetization when the variation of the static field along the sample is much larger than the RF amplitude. The procedure is based on the use of consecutively applied full-passage adiabatic pulses. The induced phase modulation is broadband and selective because it does not depend on the offset relative to the central frequency and the limits can be sharply defined. Finally, the encoded phase depends almost linearly on the local RF amplitude. All these features enable the recovery of an inhomogeneity-free spectrum with amplitudes close to the theoretically attainable maximum. Published by Elsevier Science (USA).

}, keywords = {fields}, isbn = {1090-7807}, doi = {Doi 10.1016/S1090-7807(03)00157-5}, url = {://WOS:000185095200023}, author = {Meriles, C. A. and Sakellariou, D. and Pines, A.} } @article {412, title = {Bubbling NMR polarization onto surfaces and into solution.}, journal = {Abstracts of Papers of the American Chemical Society}, volume = {214}, year = {1997}, note = {Abstr Pap Am Chem SPart 2Xq859Times Cited:0Cited References Count:0}, month = {Sep 7}, pages = {378-PHYS}, isbn = {0065-7727}, author = {Pines, A.} } @article {450, title = {Berry dephasing due to diffusion in nuclear quadrupole resonance}, journal = {Chemical Physics Letters}, volume = {247}, year = {1995}, note = {Chem Phys LettTl671Times Cited:4Cited References Count:19}, month = {Dec 22}, pages = {215-220}, abstract = {

Berry\&$\#$39;s phase can give rise to coherence dephasing in optically detected nuclear quadrupole resonance of gaseous Xe-131. Diffusion of xenon atoms around a toroidal container should cause incoherent acquisition of Berry\&$\#$39;s phase, with consequent loss of phase coherence between atoms. This leads to signal loss which is equivalent to spin relaxation. The rate of dephasing is calculated by two different methods: first, using an exact treatment of diffusion, and secondly, using average propagators. Berry dephasing is predicted to be an important relaxation mechanism in this system.

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