论文标题
通过编码超声传输增加了声学成像中的SNR
Increased SNR in acousto-optic imaging via coded ultrasound transmission
论文作者
论文摘要
声学成像（AOI）是一种非侵入性方法，它使用声学调制来绘制生物组织内部的光通量。在许多AOI实现中，超声脉冲用于时间门控测量中，以执行深度分辨成像，而无需进行机械扫描。但是，为了达到高轴向分辨率，需要使用很少循环的超声脉冲，从而限制了调制强度。在这封信中，我们开发了一种新的基于脉冲的AOI方法，其中使用了编码的超声传输。在编码 - 传输AOI（CT-AOI）中，可以实现与单个周期相对应的轴向分辨率，但具有信噪比（SNR）（SNR），该比率（SNR）缩放为周期数的平方根。与单周期AOI方案相比，使用与79个周期的CT-AOI相比，我们在SNR中表明SNR超过4倍以上。
Acousto-optic imaging (AOI) is a non-invasive method that uses acoustic modulation to map the light fluence inside biological tissue. In many AOI implementations, ultrasound pulses are used in a time-gated measurement to perform depth-resolved imaging without the need for mechanical scanning. However, to achieve high axial resolution, it is required that ultrasound pulses with few cycles are used, limiting the modulation strength. In this Letter, we developed a new approach to pulse-based AOI in which a coded ultrasound transmission is used. In coded-transmission AOI (CT-AOI), one may achieve an axial resolution that corresponds to a single cycle, but with a signal-to-noise ratio (SNR) that scales as the square root of the number of cycles. Using CT-AOI with 79 cycles, we experimentally demonstrate over 4-fold increase in SNR in comparison to a single-cycle AOI scheme.
