1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Stray-field nuclear magnetic resonance imaging in microgravity conditions
Rent:
Rent this article for
USD
10.1063/1.2842406
/content/aip/journal/jap/103/5/10.1063/1.2842406
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/5/10.1063/1.2842406
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Photographs showing (a) polystyrene beads (bead size: , approximately) and (b) a grape with a diameter of , both samples levitated in aqueous solutions of the paramagnetic agent Gd(III)DTPA at concentrations of 10 and , respectively. To aid visualization of sample size, a millimeter scale is shown.

Image of FIG. 2.
FIG. 2.

-weigthed proton NMR profile (open circles) corresponding to the sample shown in Fig. 1(a). The decrease in signal intensity in the region between 0 and with respect to the center of the rf coil indicates the presence of the polystyrene beads within the FOV setup in the NMR imaging experiment. The sampling of the region of interest was performed by varying the spectrometer frequency stepwise between and (or their equivalent in millimeters: and , respectively) with respect to frequency at the center of the coil (set to ). The 1D profile represents the amplitude of the echo at each of the 36 imaging planes along the axis. The plane thickness was and the gap between planes was at the region where the beads were located and elsewhere. For each imaging plane, 256 scans were collected with a repetition rate of . Here, differences in relaxation times of protons in water and polystyrene beads are exploited to enhance image contrast. The base line (closed circles) corresponds to an aqueous medium without the beads sampled at intervals of . The error bars correspond to the rms of the NMR signal

Image of FIG. 3.
FIG. 3.

Plot illustrating the profile contrast, , between the medium with the sample as shown in Fig. 1(b) and without the sample. For each acquisition, the sampling of the region of interest within the FOV is performed by varying the spectrometer frequency stepwise between (or their equivalent in millimeters: ) with respect to the frequency at the center of the coil. The 1D profile represents the amplitude of the echo at each of the 15 regularly spaced imaging planes along the axis. The plane thickness is and the gap between planes is . For each imaging plane, 256 scans were collected with a repetition rate of . The rms of the NMR signal is used to calculate the standard deviation (bars) at each point.

Loading

Article metrics loading...

/content/aip/journal/jap/103/5/10.1063/1.2842406
2008-03-06
2014-04-16
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stray-field nuclear magnetic resonance imaging in microgravity conditions
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/5/10.1063/1.2842406
10.1063/1.2842406
SEARCH_EXPAND_ITEM