Ultrasound modulated optical tomography for functional imaging of engineered tissue

用于工程组织功能成像的超声调制光学断层扫描

• 批准号: BB/F004923/1
• 负责人: Megan Povey
• 金额: $ 32.19万
• 依托单位: University of Leeds
• 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=BB%2FF004923%2F1
• 关键词: Ultrasound; modulated; optical; tomography; functional

Tissue engineering is the growth of new tissue or organs for clinical use, which could have a profound effect on medicine in the future. Biologists routinely use microscopes to understand the way that cells combine to form tissue. However, as the tissue being grown within the laboratory becomes thicker (2mm-1cm) then conventional microscopes cannot be used. The reason for this is that light is heavily scattered by tissue (this is the reason that you can't see the bone in your finger when you hold it up to a light bulb). New imaging methods therefore need to be developed to allow imaging of thick tissue using light. Ultrasound is a method that is routinely used in medicine for imaging thick tissue and is very useful for measuring the mechanical structure of tissue. However it cannot obtain the same functional information that can be obtained using light. For example, light can be used to detect the fluorescence of cells or the oxygen content of the blood. Within this project we will develop a new device that combines light and ultrasound to image thick tissue. This new device will provide the functional information of light at the image resolution of ultrasound. The device is based on the principle that when light passes through ultrasound it becomes modulated at the frequency of the ultrasound. This allows one to use ultrasound to place a flashing beacon of light within the tissue at a precise location and provides a method of working out where the light has been within the tissue. Moving the focus of the ultrasound to different locations within the tissue (as would be done in conventional ultrasound imaging) allows one to build up an image of light within the tissue at the resolution of ultrasound. There are several technical challenges to developing such a device as the interaction between light and sound within tissue is very weak and hence the modulated light signals emerging from the tissue are very weak. The group has expertise in light interaction with tissue, the design of medical instruments and ultrasound and we will combine this expertise to increase the size of the light signal emerging from tissue and make the light detection as sensitive as possible. One example is to use more than one source of ultrasound and interfere the ultrasound waves to provide larger light signals and better resolution. In addition we will use computer simulations to model the way light propagates through tissue and interacts with the ultrasound. This will help us understand the best way to position the ultrasound sources and light detectors to achieve the best performance. The engineers and biologists will work closely together during the project to ensure that we are constructing a useful device. Experiments will be performed to image fluorescent signals within tissue at the resolution of ultrasound during the project. The main aims can be summarised as follows; 1) Development a system combining light and ultrasound to obtain images of light within tissue at the resolution of ultrasound. 2) Use novel ultrasound methods to make the light signals emerging from the tissue as large as possible. 3) Obtain the first images of fluorescence at high resolution within thick tissue 4) Simultaneously measure the original light colour and the fluorescence within tissue. The new device will provide an important new tool for tissue engineers.

组织工程是指培育新的组织或器官用于临床，这可能对未来的医学产生深远的影响。生物学家通常使用显微镜来了解细胞联合收割机形成组织的方式。然而，随着实验室内生长的组织变得更厚（2 mm-1cm），传统的显微镜无法使用。原因是光被组织严重散射（这就是当你把手指举到灯泡前时，你看不到手指中的骨头的原因）。因此，需要开发新的成像方法，以允许使用光对厚组织进行成像。超声波是一种常规用于医学中对厚组织进行成像的方法，并且对于测量组织的机械结构非常有用。然而，它不能获得使用光可以获得的相同功能信息。例如，光可用于检测细胞的荧光或血液的氧含量。在这个项目中，我们将开发一种新的设备，结合光和超声成像厚组织。这种新设备将提供超声图像分辨率的光的功能信息。该装置基于这样的原理，即当光通过超声时，它在超声的频率下被调制。这允许人们使用超声波将闪烁的光信标放置在组织内的精确位置，并提供了一种确定光在组织内的位置的方法。将超声的焦点移动到组织内的不同位置（如在常规超声成像中所做的）允许以超声的分辨率建立组织内的光的图像。开发这种装置存在若干技术挑战，因为组织内的光和声之间的相互作用非常弱，因此从组织发出的调制光信号非常弱。该小组在光与组织的相互作用、医疗仪器和超声设计方面拥有专业知识，我们将联合收割机结合这些专业知识来增加组织发出的光信号的大小，并使光检测尽可能灵敏。一个例子是使用一个以上的超声波源并干扰超声波以提供更大的光信号和更好的分辨率。此外，我们将使用计算机模拟来模拟光通过组织传播并与超声波相互作用的方式。这将帮助我们了解定位超声源和光探测器以实现最佳性能的最佳方法。工程师和生物学家将在项目期间密切合作，以确保我们正在构建一个有用的设备。在项目期间，将进行实验，以超声分辨率对组织内的荧光信号进行成像。主要目的可以概括如下：1）开发一种结合光和超声的系统，以超声的分辨率获得组织内的光的图像。2)使用新颖的超声方法，使从组织中发出的光信号尽可能大。3)在厚组织内以高分辨率获得荧光的第一图像4）同时测量原始光颜色和组织内的荧光。新设备将为组织工程师提供重要的新工具。

项目成果

Pulse inversion ultrasound modulated optical tomography.

脉冲反转超声调制光学断层扫描。

• DOI: 10.1364/ol.37.001658
• 发表时间: 2012
• 期刊: Optics letters
• 影响因子: 3.6
• 作者: Ruan H

Application of a maximum likelihood algorithm to ultrasound modulated optical tomography.

最大似然算法在超声调制光学断层扫描中的应用。

• DOI: 10.1117/1.jbo.17.2.026014
• 发表时间: 2012
• 期刊: Journal of biomedical optics
• 影响因子: 3.5
• 作者: Huynh NT

Ultrasonic study of the gelation of gelatin: Phase diagram, hysteresis and kinetics

• DOI: 10.1016/j.foodhyd.2011.04.016
• 发表时间: 2012-01-01
• 期刊: FOOD HYDROCOLLOIDS
• 影响因子: 10.7
• 作者: Parker, N. G.;Povey, M. J. W.
• 通讯作者: Povey, M. J. W.

Food Microstructures

食品微观结构

• DOI: 10.1533/9780857098894.1.192
• 发表时间: 2013
• 作者: Povey M

Effect of object size and acoustic wavelength on pulsed ultrasound modulated fluorescence signals.

物体尺寸和声波波长对脉冲超声调制荧光信号的影响。

• DOI: 10.1117/1.jbo.17.7.076008
• 发表时间: 2012
• 期刊: Journal of biomedical optics
• 影响因子: 3.5
• 作者: Huynh NT