Feasibility of co-registered ultrasound and acoustic-resolution photoacoustic imaging of human colorectal cancer

Xiandong Leng, William Chapman, Bin Rao, Sreyankar Nandy, Ruimin Chen, Rehan Rais, Ivan Gonzalez, Qifa Zhou, Deyali Chatterjee, Matthew Mutch, Quing Zhu

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Colorectal cancer is the second leading cause of cancer death in the United States. Significant limitations in screening and surveillance modalities continue to hamper early detection of primary cancers or recurrences after therapy. In this study, we describe a new registered ultrasound (US) and acoustic-resolution photoacoustic microscopy (AR-PAM) system and report its initial testing in ex vivo human colorectal tissue. A total of 8 colorectal specimens were imaged, which included 2 polyps, 4 malignant colon cancers, and 2 treated colorectal cancers. In each specimen, normal tissue was also imaged for internal control. Initial data have demonstrated the feasibility of identifying colorectal cancer imaging features and the invasion depth using co-registered US and an AR-PAM system. In normal tissue, we found that our system consistently demonstrates the multi-layer structure of normal colonic tissue while differentiating layers with elevated vascularity; these findings highly correlated with histologic findings of each specimen. For malignant colorectal samples, the tissue structure is highly disorganized as seen in US, and photoacoustic imaging revealed distorted vascular distribution inside the tumor. Notably, AR-PAM of tumor beds after complete tumor destruction by radiation and chemotherapy yielded a pattern identical to benign tissue. Quantitative analysis of photoacoustic spectral slope has demonstrated more high-frequency components in malignant tissue as compared to the normal colon tissue, which may be caused by significantly increased microvessel networks. In summary, we demonstrate the successful differentiation of benign and malignant colorectal tissue with our co-registered ultrasound and photoacoustic system.

Original languageEnglish
Article number#342357
Pages (from-to)5159-5172
Number of pages14
JournalBiomedical Optics Express
Volume9
Issue number11
DOIs
StatePublished - Nov 1 2018

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