Journal of Biomedical Optics
Geisel School of Medicine
Thayer School of Engineering
Wide local excision (WLE) of tumors with negative margins remains a challenge because surgeons cannot directly visualize the mass. Fluorescence-guided surgery (FGS) may improve surgical accuracy; however, conventional methods with direct surface tumor visualization are not immediately applicable, and properties of tissues surrounding the cancer must be considered. We developed a phantom model for sarcoma resection with the near-infrared fluorophore IRDye 800CW and used it to iteratively define the properties of connective tissues that typically surround sarcoma tumors. We then tested the ability of a blinded surgeon to resect fluorescent tumor-simulating inclusions with ∼1-cm margins using predetermined target fluorescence intensities and a Solaris open-air fluorescence imaging system. In connective tissue-simulating phantoms, fluorescence intensity decreased with increasing blood concentration and increased with increasing intralipid concentrations. Fluorescent inclusions could be resolved at ≥1-cm depth in all inclusion concentrations and sizes tested. When inclusion depth was held constant, fluorescence intensity decreased with decreasing volume. Using targeted fluorescence intensities, a blinded surgeon was able to successfully excise inclusions with ∼1-cm margins from fat- and muscle-simulating phantoms with inclusion-to-background contrast ratios as low as 2∶1. Indirect, subsurface FGS is a promising tool for surgical resection of cancers requiring WLE.
Samkoe KS, Bates BD, Tselepidakis NN, DSouza AV, Gunn JR, Ramkumar DB, Paulsen KD, Pogue BW, Henderson ER. Development and evaluation of a connective tissue phantom model for subsurface visualization of cancers requiring wide local excision. J Biomed Opt. 2017 Dec;22(12):1-12. doi: 10.1117/1.JBO.22.12.121613. PMID: 29274143; PMCID: PMC5741805.
Dartmouth Digital Commons Citation
Samkoe, Kimberly S.; Bates, Brent D.; Tselepidakis, Niki N.; Dsouza, Alisha V.; Gunn, Jason R.; Ramkumar, Dipak B.; Paulsen, Keith D.; Pogue, Brian W.; and Henderson, Eric R., "Development and Evaluation of a Connective Tissue Phantom Model for Subsurface Visualization of Cancers Requiring Wide Local Excision" (2017). Dartmouth Scholarship. 3930.