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Delta-sigma oversampled ultrasound beamformer with dynamic delays

机译:具有动态延迟的Delta-sigma过采样超声波束形成器

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摘要

The principles of oversampling are exploited in a simple beamforming architecture using a single bit delta-sigma (/spl Delta/C) analog to digital converter (A/D) on every channel. The high sampling rate required for the single bit A/D provides adequate delay accuracy for high quality beamforming using elementary sample manipulations. Images produced with this beamformer exhibit significant artifacts directly related to dynamic focusing. However, a simple digital recording technique following delays permits dynamically focused beamforming without degrading image quality. The simplicity of this beamformer compared to conventional methods may facilitate very large channel count or low power beamformers suitable for 1.5-D arrays or portable scanners.
机译:在简单的波束成形架构中利用过采样的原理,在每个通道上使用单个位的delta-sigma(/ spl Delta / C)模数转换器(A / D)。单位A / D所需的高采样率为使用基本样本操作​​的高质量波束形成提供了足够的延迟精度。用这种波束形成器产生的图像显示出与动态聚焦直接相关的大量伪像。但是,延迟后的简单数字记录技术允许动态聚焦的波束成形而不会降低图像质量。与传统方法相比,此波束形成器的简单性可以促进非常大的通道数或适用于1.5-D阵列或便携式扫描仪的低功率波束形成器。

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