arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1907.09264physics.med-phphysics.app-phphysics.chem-ph
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深部仿组织体模中单个运动微小目标的实时光声跟踪

Real-time optoacoustic tracking of single moving micro-objects in deep tissue-mimicking phantoms

Azaam Aziz, Mariana Medina-Sánchez, Jing Claussen, Oliver G. Schmidt

摘要:

医学影像学在多种疾病的诊断和治疗中发挥着重要作用。这是一个不断发展的领域,寻求提高灵敏度和时空分辨率,以允许动态监测发生在微米和纳米级的各种生物过程。用于靶向诊断和治疗的新兴技术,如纳米治疗剂、微型植入物、导管和小型医疗工具,在人体内执行功能时,也需要精确定位和监测。在这项工作中,我们首次展示了使用多光谱光声层析成像(MSOT)对低于厘米厚组织模仿幻影的移动单个微物体的实时跟踪。该技术结合了超声成像在深度和分辨率方面的优势与光学方法的分子特异性,从而有助于区分微观物体的光谱特征与内在组织分子的光谱特征。通过用金纳米棒涂覆微物体表面,所得的MSOT信号在对比度和特异性方面得到进一步改善,具有独特的吸收光谱,这将允许它们在转化为体内设置时与周围生物组织区分开。

英文摘要:

Medical imaging plays an important role in diagnosis and treatment of multiple diseases. It is a field under continuous development which seeks for improved sensitivity and spatiotemporal resolution to allow the dynamic monitoring of diverse biological processes that occur at the micro- and nanoscale. Emerging technologies for targeted diagnosis and therapy such as nanotherapeutics, micro-implants, catheters and small medical tools also need to be precisely located and monitored while performing their function inside the human body. In this work, we show for the first time the real-time tracking of moving single micro-objects below centimeter thick tissue-mimicking phantoms, using multispectral optoacoustic tomography (MSOT). This technique combines the advantages of ultrasound imaging regarding depth and resolution with the molecular specificity of optical methods, thereby facilitating the discrimination between the spectral signatures of the micro-objects from those of intrinsic tissue molecules. The resulting MSOT signal is further improved in terms of contrast and specificity by coating the micro-objects surface with gold nanorods, possessing a unique absorption spectrum, which will allow their discrimination from surrounding biological tissues when translated to in vivo settings.

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