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Code:
FOB
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Time Slot/Poster Number:
10:45-11:10
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Session:
Exotica & Beyond
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Remotely Detected Magnetic Resonance Imaging and Velocimetry
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| Vikram Bajaj; Jeffrey Paulsen; Nicholas Halpern-Manners; Thomas Teisseyre; Elad Harel; Alexander Pines
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LBNL & UC Berkeley, Berkeley, CA
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| Abstract |
We present consequences and applications of a multidimensional magnetic resonance method, remotely detected MRI, in which sample flow or translation separates the encoding and detection steps of an experiment, allowing each to be separately optimized. The method is particularly useful in rapidly flowing samples, or in microporous or other materials in which low filling factors preclude sensitive direct imaging. We show acute examples within microfluidics, and preliminary applications in microporous systems, including the possibility of microimaging of vasculature in vivo. We discuss how remote detection will enable the operation of new portable magnetic resonance devices.
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Code:
FOB
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Time Slot/Poster Number:
11:10-11:25
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Session:
Exotica & Beyond
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Multi-Slice Scanning Magnetic Imaging and Applications in Molecular Recognition
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| Shoujun Xu
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University of Houston, Houston, TX
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| Abstract |
We present a novel technique for direct imaging of magnetic nanoparticles. The technique, scanning magnetic imaging, is based on atomic magnetometry which utilizes optically-pumped atomic coherence interacting with polarized laser. In contrast to magnetic resonance imaging which relies on the relaxation contrast of nuclear spins to detect magnetic particles, our technique is capable of sensing dc magnetic signal. We show two applications in molecular imaging. One is quantitative binding of magnetically-labeled antibodies to specific targets. The other is measuring the rupture force of biotin-streptavidin interaction in a continuous flow mode. Finally, we compare scanning magnetic imaging with magnetic resonance imaging in terms of capability, sensitivity, and cost.
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Code:
FOB
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Time Slot/Poster Number:
11:25-11:50
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Session:
Exotica & Beyond
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Compact Permanant Magnet NMR: On the path to portable NMR
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| Eiichi Fukushima1; Shin Utsuzawa2; Andrew McDowell1
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1ABQMR, Albuquerque, NM; 2New Mexico Resonance, Albuquerque, New Mexico
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| Abstract |
We present permanent magnet and probe combinations that advance the field of portable NMR. One is unilateral NMR that is functionally similar to NMR MOUSE but generates a remote uniform field spot that is well suited to characterize longer relaxation time signals. Another is a compact dipole magnet that yields NMR signals in 80 to 400 micron capillaries at 1 to 1.7T. The 1T magnet is 5cm cubed and weighs 700 grams. These magnets are used to detect magnetic nano-particles that perturb the static magnetic field for sufficient fractions of the cross-section to affect the signal. The same magnet in its unshimmed state has been used to obtain moderate resolution chemical shift spectra of ethanol.
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Code:
FOB
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Time Slot/Poster Number:
11:50-12:05
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Session:
Exotica & Beyond
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Polarization transport in a one-dimensional spin chain
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| Chandrasekhar Ramanathan1; Paola Cappellaro1; Lorenza Viola2; David Cory1
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1Massachusetts Institute of Technology, Cambridge, MA; 2Dartmouth College, Hanover, NH
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| Abstract |
We characterize the spin dynamics underlying the transport of polarization in a spin chain under the nearest-neighbor-coupled isotropic XY and double quantum (DQ) Hamiltonians, in the weak polarization limit. We show that the spins evolves in a sub-space (N x N) of the system Hilbert space (n x n, where N = log2(n) ), and that the spin dynamics map on to a continuous-time quantum walk on a 1D graph. We experimentally measure the collective polarization of the spins under DQ evolution in a single-crystal of fluorapatite for both end-polarized and thermally polarized initial states. Excellent agreement is obtained between experiment and theory. This work opens the door to the experimental characterization of additional spin-spin correlations in these systems.
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