• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-Optics >Compensation of acoustic attenuation for high-resolution photoacoustic imaging with line detectors
【24h】

Compensation of acoustic attenuation for high-resolution photoacoustic imaging with line detectors

机译：用线路检测器的高分辨率光声成像的声学衰减补偿

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Photoacoustic imaging is based on the generation of acoustic waves in a semitransparent sample after illumination with short pulses of light or radio waves. The goal is to recover the spatial distribution of absorbed energy density inside the sample from acoustic pressure signals measured outside the sample (photoacoustic inverse problem). We have proposed a numerical method to calculate directly the time reversed field by re-transmitting the measured pressure on the detection surface in reversed temporal order. This model-based time reversal method can solve the photoacoustic inverse problem exactly for an arbitrary closed detection surface. Recently we presented a set up which requires a single rotation axis and line detectors perpendicular to the rotation axis. Using a two-dimensional reconstruction method, such as time reversal in two dimensions, and applying the inverse two-dimensional radon transform afterwards gives an exact reconstruction of a three-dimensional sample with this set up. The resolution in photoacoustic imaging is limited by the acoustic bandwidth and therefore by acoustic attenuation, which can be substantial for high frequencies. This effect is usually ignored in reconstruction algorithms but has a strong impact on the resolution of small structures. It is demonstrated that the model based time reversal method allows to partly compensate this effect.
机译：光声成像基于在光线或无线电波的短脉冲照射后半透明样品中的声波的产生。目标是从样品外部（光声反向问题）外的声压信号中恢复样品内吸收能量密度的空间分布。我们已经提出了一种数值方法，通过以反向的时间顺序重新传输测量的检测表面上的测量压力来直接计算时间反转场。这种基于模型的时间反转方法可以解决适用于任意闭合检测表面的光声反向问题。最近我们提出了一个设置，需要一个旋转轴和垂直于旋转轴的线路检测器。使用二维重建方法，例如在两个维度中的时间反转，并且之后施加逆二维氡变换，可以通过该设置精确地重建三维样本。光声成像中的分辨率受声学带宽的限制，因此通过声学衰减，这对于高频率来说是基本的。在重建算法中通常忽略这种效果，但对小型结构的分辨率产生了强烈影响。证明基于模型的时间反转方法允许部分补偿这种效果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号