Boston Scientific View Institution's Website 1 article published in JoVE Medicine Dorsal Column Steerability with Dual Parallel Leads using Dedicated Power Sources: A Computational Model Dongchul Lee1, Ewan Gillespie1, Kerry Bradley1 1Boston Scientific , Neuromodulation Using a mathematical model of spinal cord stimulation, we found that a multi-source system with independent power sources for each contact can target more central points of stimulation on the dorsal column (100 vs 3) and has 50-fold more field steering resolution (0.02mm vs 1mm) than a single-source system.