Data underlying the publication: Ultrasound Transparent Neural Interfaces for Multimodal Interaction - Phantom experiments of neural electrode phantom

<strong>Data for phantom experiments</strong><strong>Fow phantom imaging sequence</strong>Ultrasound images were acquired using an 18 MHz linear array (L22-14vX LF with 128 piezoelectric elements, 100 μm pitch, 22 mm elevation focus, Verasonics, USA) connected to a programmable ultrasound scanner (Vantage 256 High frequency configuration, Verasonics, USA). We transmitted a sequence of 12 angled plane waves (-10° to 10°), resulting in a 1 kHz frame rate after compounding. Ensembles of 200 compounded frames were acquired every 2 s for a total period of 360 s, resultingin an effective power Doppler rate of 0.5 Hz. During acquisition, RF data were real-time delay-and-sum beamformed to complex In-phase and Quadrature (IQ) frames, which were saved for later offline Doppler processing. In the phantom study, an ultrasound imaging plane was selected to capture the transverse cross-section of the BMF channel. The imaging probe was positioned at three different distances to the channel, and data were recorded in separate sessions for each distance. During each session, the probe was mounted on a motorized XYZ-stage and positioned over the phantom, which was immersed in a water tank. For each session, recordings were made both without and with the Neural Electrode Phantom (NEP) placed between the probe and the phantom. The NEP consisted of a 2.5 μm ParC substrate, 300 nm Au with a 50 nm Ti adhesion layer, and 1.5 μm ParC insulation. To prevent floating, the NEP was weighted down during placement.<br>

<strong>体模实验数据</strong>
<strong>体模成像序列（phantom imaging sequence）</strong>
本研究使用美国Verasonics公司生产的可编程超声扫描仪（Vantage 256高频配置版），搭配其18 MHz线阵探头（L22-14vX LF，含128个压电阵元，阵元间距100 μm，聚焦高度22 mm）采集超声图像。我们发射12组斜平面波（角度范围-10°至10°），经复合成像后帧率可达1 kHz。每2秒采集200帧复合图像，总采集时长360 s，最终得到有效功率多普勒帧率为0.5 Hz。采集过程中，射频（RF）数据经实时延迟求和波束成形处理为同相正交（IQ）复帧并保存，用于后续离线多普勒处理。
在本次体模实验中，选取超声成像平面以捕捉BMF通道的横向横截面。将成像探头与该通道设置为三种不同间距，针对每种间距分别开展独立实验环节。每个实验环节中，探头固定于电动XYZ位移台并置于浸没于水槽的体模上方。每个实验环节均完成两组采集：一组未在探头与体模之间放置神经电极体模（Neural Electrode Phantom, NEP），另一组则放置该体模。该NEP的结构包含2.5 μm厚的ParC基底、300 nm厚的金（Au）层与50 nm厚的钛（Ti）粘附层，以及1.5 μm厚的ParC绝缘层。为防止其漂浮，放置过程中对NEP进行了配重固定。