Abstract
This investigation highlights the use of infrared microspectroscopy for the morphological analysis of urinary stones. The research presented here has utilized the reflectance mode of an infrared microscope for use in creating chemically specific maps of cross-sectioned renal calculi surfaces, precisely showing the placement of renal stone components in a calculus sample. The method has been applied to renal stones of both single and multiple components consisting primarily of hydroxyapatite, calcium oxalate monohydrate and calcium oxalate dihydrate. Factors discussed include the photometric accuracy of the spectra obtained, a comparison of the surface reflectance method with existing methods such as diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and attenuated total internal reflection (ATR) analysis, and the influence of specular reflectance between polished and unpolished sample spectra. Full spectral maps of cross-sectioned renal stones provided positive localization of components using qualitatively accurate spectra similar in appearance to DRIFTS spectra. Unlike ATR and DRIFTS spectra, surface reflectance spectra lack photometric accuracy and are therefore not quantifiable; at present, however, spectra are suitable for qualitative analysis. It was found that specular reflectance increases minimally with a highly polished stone cross-section surface, though qualitative data is not affected. Surface reflectance imaging of sections of renal stones is useful for determining the identity of stone components while simultaneously providing precise locations of mineral components within the stone using presently available instruments.
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Acknowledgments
The authors would like to thank Molly Jackson for her aid in the acquisition and preparation of the urinary calculi samples. Additionally, funding for a portion of this research was obtained from the National Institute of Health, grant PO1 DK56788.
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Anderson, J.C., Williams, J.C., Evan, A.P. et al. Analysis of urinary calculi using an infrared microspectroscopic surface reflectance imaging technique. Urol Res 35, 41–48 (2007). https://doi.org/10.1007/s00240-006-0077-x
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DOI: https://doi.org/10.1007/s00240-006-0077-x