作者
Warren S Warren, Sangdoo Ahn, Marlene Mescher, Michael Garwood, Kamil Ugurbil, Wolfgang Richter, Rahim R Rizi, Jeff Hopkins, John S Leigh
发表日期
1998/7/10
期刊
Science
卷号
281
期号
5374
页码范围
247-251
出版商
American Association for the Advancement of Science
简介
A new method for magnetic resonance imaging (MRI) based on the detection of relatively strong signal from intermolecular zero-quantum coherences (iZQCs) is reported. Such a signal would not be observable in the conventional framework of magnetic resonance; it originates in long-range dipolar couplings (10 micrometers to 1 millimeter) that are traditionally ignored. Unlike conventional MRI, where image contrast is based on variations in spin density and relaxation times (often with injected contrast agents), contrast with iZQC images comes from variations in the susceptibility over a distance dictated by gradient strength. Phantom and in vivo (rat brain) data confirm that iZQC images give contrast enhancement. This contrast might be useful in the detection of small tumors, in that susceptibility correlates with oxygen concentration and in functional MRI.
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