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	<title>MIG Blog &#187; Technical</title>
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	<description>Thoughts on microstructure imaging</description>
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		<title>The great diffraction distraction</title>
		<link>http://web4.cs.ucl.ac.uk/research/medic/mig/blog/?p=18</link>
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		<pubDate>Wed, 23 Jun 2010 13:04:14 +0000</pubDate>
		<dc:creator>Danny</dc:creator>
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		<description><![CDATA[Under the short-gradient pulse (SGP) approximation, the pulsed-gradient spin-echo (PGSE) diffusion NMR signal from a restricted population of spins as a function of b-value or wavenumber q or gradient strength &#124;G&#124; shows a characteristic diffraction pattern (Callaghan Nature 1990).  Moreover, the frequency of the diffraction pattern varies inversely with the size of the restricting pore, [...]]]></description>
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