Nonparametric clutter rejection in Doppler ultrasound using principal component analysis GPU-Based Reconstruction and Display for 4D Ultrasound Data Multipass GPU Surface Rendering in 4D Ultrasound Optimized Graphical Processing Unit Processing Framework for Surface Rendering in 4D Ultrasound Imaging New Methodologies for processing medical images New Methodology In Doppler Ultrasound 4D Ultrasound Adaptive Image Pre-processing Ultrasound speckle noise reduction based on motion compounding using Optimized Adaptive Rood Pattern Search Implementation of a Pulsed-Wave Spectral Doppler Module on a Programmable Ultrasound System