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Proceedings Paper

Software implementation of ultrasound beamforming using ADSP-TS201 DSPs
Author(s): Hak-Yeol Sohn; Sin-hyeok Seo; Jaemin Kim; Tai-Kyong Song
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Paper Abstract

We present a software-based ultrasound beamformer to build a fully software-based ultrasound scanner which performs real-time delay-sum beamforming using fractional delay filters using ADSP-TS201 DPSs (Analog Device Inc.). Receive dynamic focusing generally requires fast transfer of a large amount of data for inter-channel summation and for delay control. The DSPs are connected in pipelined network architecture without a glue logic using the DPS's parallel ports, which allows the connection of unlimited DSPs. Each DSP has a small input FIFO which takes as input the data samples from each ADC and can take delay values either from a memory (to use pre-calculated delay values) or an external FPGA (for real-time delay calculation) via its LVDS channel. Two fractional delay beamformer (FDBF) schemes are implemented on the DSP system. Each scheme is programmed in assembly code optimized for speed; instruction level parallelism is secured to maximally utilize the four execution units of each DSP, pipeline scheduling is employed to avoid pipeline stall, and instruction reordering techniques are used to prevent memory contention while preserving the program semantics. It is found that dynamic focusing is carried out faster when delay filtering is performed prior to interchannel summation, whereas hardware implementation of the FDBF favors performing delay filtering after interchannel summation. The frame rate achievable with 16 DSPs is up to 28Hz when the sampling rate is 40MHz, the view depth is 20cm, the number of scanline is 128, and the number of channel is 64.

Paper Details

Date Published: 13 March 2008
PDF: 11 pages
Proc. SPIE 6920, Medical Imaging 2008: Ultrasonic Imaging and Signal Processing, 69200Z (13 March 2008); doi: 10.1117/12.770031
Show Author Affiliations
Hak-Yeol Sohn, Sogang Univ. (South Korea)
Sin-hyeok Seo, Sogang Univ. (South Korea)
Jaemin Kim, Sogang Univ. (South Korea)
Tai-Kyong Song, Sogang Univ. (South Korea)

Published in SPIE Proceedings Vol. 6920:
Medical Imaging 2008: Ultrasonic Imaging and Signal Processing
Stephen A. McAleavey; Jan D'hooge, Editor(s)

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