Resolution Limit (without Deconvolution) for Different Particle Sizes as a Function of Gradient Strength. Resolution Δx achievable without deconvolution for different diameters d of magnetite particles (Fe3O4) as a function of gradient strength G. According to equations (18) and (19), the limit is proportional to d
-3 and G
-1. The cross-hairs indicate a gradient/particle combination used in recent in vivo experiments .