Stephen Dodd1, Gary Zabow1, Alan Koretsky1
1Laboratory of Functional and Molecular Imaging, NINDS, National Insitutes of Health, Bethesda, MD, United States
A method to measure the distance between two magnetic particles at high spatial resolution is presented. Microfabrication is used to make an array of particles at different separations with high precision. Gradient-echo MR images are acquired with 4x higher spatial resolution in the direction of the particle spacing and using phase maps the distance between particles can be measured down to the level of a pixel.