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Development of a spatially offset Raman spectroscopy probe for breast tumor surgical margin evaluation.

Keller MD, Vargis E, de Matos Granja N, Wilson RH, Mycek MA, Kelley MC, Mahadevan-Jansen A
J Biomed Opt. 2011 16 (7): 077006

PMID: 21806286 · PMCID: PMC3144975 · DOI:10.1117/1.3600708

The risk of local recurrence for breast cancers is strongly correlated with the presence of a tumor within 1 to 2 mm of the surgical margin on the excised specimen. Previous experimental and theoretical results suggest that spatially offset Raman spectroscopy (SORS) holds much promise for intraoperative margin analysis. Based on simulation predictions for signal-to-noise ratio differences among varying spatial offsets, a SORS probe with multiple source-detector offsets was designed and tested. It was then employed to acquire spectra from 35 frozen-thawed breast tissue samples in vitro. Spectra from each detector ring were averaged to create a composite spectrum with biochemical information covering the entire range from the tissue surface to ∼2 mm below the surface, and a probabilistic classification scheme was used to classify these composite spectra as "negative" or "positive" margins. This discrimination was performed with 95% sensitivity and 100% specificity, or with 100% positive predictive value and 94% negative predictive value.

MeSH Terms (13)

Animals Breast Neoplasms Carcinoma, Ductal, Breast Chickens Female Humans In Vitro Techniques Mastectomy, Segmental Models, Statistical Monte Carlo Method Optical Phenomena Signal-To-Noise Ratio Spectrum Analysis, Raman

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