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High Spatial Frequency Structured Light Imaging for Intraoperative Breast Tumor Margin Assessment

机译:高空间频率结构光成像术中乳腺癌肿瘤边缘评估。

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A new superficial wide-field imaging technique is presented, which utilizes high spatial frequency structured illumination to constrain the light sampling volume to a sub-diffuse regime. In this transport regime, the effects of absorption are drastically reduced and the sensitivity to local scattering from ultrastructrual alterations is increased. Absorption independence is validated with multiple experiments including a bovine blood-Intralipid solution matrix and avian tissue with superficial bovine blood. The resulting structured light demodulated images show a complete insensitivity to the blood over Hb concentrations of 0 - 240 μM. Increased sensitivity to ultrastructual changes is demonstrated by imaging avian tissue with controlled morphological alterations including formalin-induced crosslinking. This imaging technique is currently being translated towards intraoperative assessment of breast tumor margins because of its ability to capture an entire lumpectomy margin in a single field of view, insensitivity to confounding surface blood present on lumpectomies, and its inherent scatter signal without the need of any model inversion. Further, a new lumpectomy marking system is introduced that allows for both the surgeon to mark the lumpectomy during excision and optical assessment of the specimen after the margins have been marked. Structured light images acquired intraoperatively of all margins of lumpectomy specimens are presented to show feasibility of clinical translation. Immediate future work will focus on developing a multi-spectral system.
机译:提出了一种新的浅表广域成像技术,该技术利用高空间频率结构化照明将光采样量限制在亚扩散范围内。在这种运输方式中,吸收的影响被大大降低,并且对超微结构改变引起的局部散射的敏感性增加了。吸收独立性已通过多个实验验证,包括牛血-脂内溶液基质和带有浅表牛血的禽类组织。所得的结构化光解调图像显示,在0-240μM的Hb浓度下,对血液完全不敏感。通过对禽类组织进行具有受控形态变化(包括福尔马林诱导的交联)的成像,可以证明对超微结构变化的敏感性提高。由于该成像技术能够在单个视野中捕获整个肿块切除术的边缘,对混杂物上存在的表面血流不敏感以及其固有的散射信号而无需任何操作,因此目前正被转化为术中评估乳腺肿瘤边缘的技术。模型反转。此外,引入了一种新的肿块切除术标记系统,该系统允许外科医生在切除过程中对肿块切除术进行标记,并在标记边缘后对标本进行光学评估。术中获取的所有切除术标本的边缘的结构化光图像被提出,以显示临床翻译的可行性。近期的工作将集中在开发多光谱系统上。

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