Event Details
Evaluation of GSC-based and ASSB-based Beamforming Methods Applied to Ultrasound Imaging
Presenter: Mohammed Albulayli
Supervisor: Dr. Daler Rakhmatov
Date: Fri, July 27, 2012
Time: 13:00:00 - 14:00:00
Place: EOW 430
ABSTRACT
Abstract:
Adaptive beamforming techniques have been shown to improve the quality of ultrasound images by achieving excellent sidelobe suppression. This quality improvement, however, comes at a high computational cost. We aim to answer the following basic question: Can we reduce the computational complexity of adaptive beamforming without a significant degradation of the image quality? Our objective is to explore a combination of low-complexity non-adaptive beamforming, such as the conventional Delay-and-Sum (DAS) method, with high-complexity adaptive beamforming, such as the standard Minimum-Variance Distortionless Response (MVDR) method implemented using the Generalized Sidelobe Canceller (GSC). We also investigate the performance of the Adaptive Single Snapshot Beamformer (ASSB), which is relatively unexplored in the ultrasound imaging literature. Our B-mode ultrasound simulation results show that, in comparison to optimal high-complexity always-adaptive beamforming, our simple hybrid beamformer can yield significant computational savings (approximately 59%), while maintaining the image quality (measured in terms of resolution and contrast) within a 5% degradation margin.