title: An optimized ultrasound digital beamformer with dynamic focusing implemented on FPGA.
abstract: We present a resource-optimized dynamic digital beamformer for an ultrasound system based on a field-programmable gate array (FPGA). A comprehensive 64-channel receive beamformer with full dynamic focusing is embedded in the Altera Arria V FPGA chip. To improve spatial and contrast resolution, full dynamic beamforming is implemented by a novel method with resource optimization. This was conceived using the implementation of the delay summation through a bulk (coarse) delay and fractional (fine) delay. The sampling frequency is 40 MHz and the beamformer includes a 240 MHz polyphase filter that enhances the temporal resolution of the system while relaxing the Analog-to-Digital converter (ADC) bandwidth requirement. The results indicate that our 64-channel dynamic beamformer architecture is amenable for a low power FPGA-based implementation in a portable ultrasound system.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Almekkawy
authors.forename: Jingwei
authors.initials: J
authors.lastname: Xu
authors.forename: Mohan
authors.initials: M
authors.lastname: Chirala
mesh_terms: D000703:Analog-Digital Conversion; D004867:Equipment Design; D007090:Image Interpretation, Computer-Assisted; D007091:Image Processing, Computer-Assisted; D014465:Ultrasonics / Q000295:instrumentation*