Yanqin Lin1, Guiping Sheng1,
Congbo Cai1, Shuhui Cai1, Jianhui Zhong2,
Zhong Chen1
1Department of Physics,
Xiamen University, Xiamen, Fujian, China, People's Republic of; 2Department
of Imaging Sciences, University of Rochester, Rochester, NY, United States
Intermolecular double-quantum coherences (iDQCs) have some unique properties and have been applied for novel contrast of MRI. In the conventional iDQC imaging experiments, the distant dipolar field (DDF) is generated by coherence selection gradients (CSGs). However, it is found that DDF can arise from certain sample geometry in the absence of CSGs. Here, we demonstrate that sample geometry plays an important role in generating DDF in the absence of CSGs, and this DDF can yield stronger iDQC signal than that from the CSGs if an appropriate phase cycling scheme is adopted. This will facilitate iDQC practical applications.