Imaging Beyond the Born Approximation: A Physical Approach

超越出生近似的成像：物理方法

• 批准号: EP/F00947X/1
• 负责人: Francesco Simonetti
• 金额: $ 38.07万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF00947X%2F1
• 关键词: Imaging; Beyond; Born; Approximation; Physical

The objective of this proposal is to improve imaging techniques which exploit the interaction of waves with matter to reconstruct the physical properties of an object. To date these techniques have been limited by the tradeoff between resolution and imaging depth. While long wavelengths can penetrate deep into a medium, the classical diffraction limit precludes the possibility of observing subwavelength structures. Over the past twenty years, near-field microscopy has demonstrated that the diffraction limit can be broken by bringing a probing sensor within one wavelength distance from the surface of the object to be imaged. Now, the scope of near field microscopy has been extended to the reconstruction of subwavelength structures from measurements performed in the far-field, this approach having a much wider range of applications since often the structure to be imaged is not directly accessible. The key to subwavelength resolution lies in the physical models employed to describe wave scattering. Conventional imaging methods use the Born approximation which does not take into account the distortion of the probing wave as it travels through the medium to be imaged, so neglecting what is known as multiple scattering. On the other hand, multiple scattering is the key mechanism which can encode subwavelength information in the far-field, thus leading to a potentially unlimited resolution. New experimental evidence has shown that a resolution better than a quarter of the wavelength can be achieved for an object more than 70 wavelengths away from the probing sensors. This preliminary work has established the fundamental principle that subwavelength resolution from far-field measurements is possible as long as the Born approximation is abandoned and more accurate models for the wave-matter interaction are adopted. The aim of this proposal is to pursue this new and exciting idea and to focus on more specific applications such as medical diagnostics and geophysical imaging.

这项提议的目的是改进成像技术，利用波与物质的相互作用来重建物体的物理特性。迄今为止，这些技术受到分辨率和成像深度之间权衡的限制。虽然长波长可以穿透到介质深处，但经典的衍射极限排除了观察亚波长结构的可能性。在过去的二十年里，近场显微镜已经证明，通过在距离被成像物体表面一个波长距离内放置一个探测传感器，可以打破衍射极限。现在，近场显微镜的范围已经扩展到从远场测量中重建亚波长结构，这种方法具有更广泛的应用范围，因为通常要成像的结构不能直接接近。亚波长分辨率的关键在于用来描述波散射的物理模型。传统的成像方法使用玻恩近似，它不考虑探测波在被成像介质中传播时的畸变，因此忽略了所谓的多重散射。另一方面，多重散射是在远场编码亚波长信息的关键机制，从而导致潜在的无限分辨率。新的实验证据表明，对于距离探测传感器超过70个波长的物体，可以实现优于四分之一波长的分辨率。这项初步工作建立了一个基本原理，即只要放弃玻恩近似并采用更精确的波-物质相互作用模型，就可以实现远场测量的亚波长分辨率。这项提议的目的是追求这一令人兴奋的新想法，并将重点放在更具体的应用上，如医学诊断和地球物理成像。

项目成果

A practical, robust approach to high-resolution breast ultrasound tomography

一种实用、稳健的高分辨率乳腺超声断层扫描方法

• DOI: 10.1117/12.878690
• 发表时间: 2011
• 作者: Huthwaite P

On the measurement of ultrasound transmission through a penetrable acoustic cone

可穿透声锥的超声波传输测量

• DOI: 10.1117/12.878692
• 发表时间: 2011
• 作者: Huthwaite P

High-resolution imaging with a real-time synthetic aperture ultrasound system: a phantom study

• DOI: 10.1117/12.878767
• 发表时间: 2011-03
• 作者: Lianjie Huang;Y. Labyed;F. Simonetti;Michael R. Williamson;R. Rosenberg;P. Heintz;D. Sandoval

The different structural scales of the breast and their impact on time-of-flight and diffraction tomography

乳房的不同结构尺度及其对飞行时间和衍射断层扫描的影响

• DOI: 10.1117/12.844346
• 发表时间: 2010
• 作者: Huthwaite P