论文标题
频域中的相位不敏感与相位敏感的超声吸收断层扫描
Phase-insensitive versus phase-sensitive ultrasound absorption tomography in the frequency domain
论文作者
论文摘要
随着检测器元素尺寸的增加，相敏感检测器（例如压电检测器）的灵敏度变得越来越多。相比之下，具有相位敏感的高电感传感器，即使对于大元素尺寸，它们也保留了全元素方向，尽管它们的时间分辨率明显较差。这项研究使用数值模型来检查相位不敏感的检测器是否可以在超声断层扫描（特别是吸收断层扫描）中使用，当时检测器数量很少。我们介绍了针对相敏感和相敏感传感器的测量模型，并根据图像对比度指标比较了这些传感器类型之间的吸收重建质量。我们使用基于雅各布的线性矩阵反转方法进行综合数据执行反演。
The sensitivity of phase-sensitive detectors, such as piezoelectric detectors, becomes increasingly directional as the detector element size increases. In contrast, pyroelectric sensors, which are phase-insensitive, retain their omni-directionality even for large element sizes, although they have significantly poorer temporal resolution. This study uses numerical models to examine whether phase-insensitive detectors can be used advantageously in ultrasound tomography, specifically absorption tomography, when the number of detectors is sparse. We present measurement models for phase-sensitive and phase-insensitive sensors and compare the quality of the absorption reconstructions between these sensor types based on image contrast metrics. We perform the inversion using synthetic data with a Jacobian-based linearised matrix inversion approach.
