Abstract

Raman opportunities in the field of pathological calcifications

Highlights

  • First described in 1928 by Raman and Krishnan [1] from which it gets its name and predicted theoretically by Smekal in 1923 [2], Raman spectroscopy is an optical spectroscopy which allows the vibrational signatures of probed compounds to be extracted from the scattered light upon illumination of a sample with a monochromatic excitation source [3,4]

  • Raman spectra represent on the x-axis either the wavelength (λ: nm) or the energy (ν: wavenumber in inverse centimeter cm−1) associated with the optical transitions and on the y-axis their probability of occurrence

  • One main strength of Raman spectroscopy lies in the fact that the chemical signature is contained in the scattered light collected upon irradiation with a monochromatic laser source

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Summary

Introduction

First described in 1928 by Raman and Krishnan [1] from which it gets its name and predicted theoretically by Smekal in 1923 [2], Raman spectroscopy is an. It has been applied to complex biological samples, such as fluids [9,10], cells [11,12], minerals as physiological [13,14,15] and pathological calcifications [16,17,18] and tissues [19] Such versatility explains the numerous applications of Raman spectroscopy in different specialties of medicine [20,21,22], among which are nephrology [23,24,25,26,27,28,29,30], rheumatology [31,32,33], hematology [34,35,36], gastroenterology [37,38] or endocrinology [39,40]. A literature review focusing on pathological calcifications and featuring the most recent works will be presented

Notion of Raman shift
Vibration modes in Raman and IR spectroscopy
Notion of “virtual” state
Raman efficiency
Some characteristics of Raman spectra
Confocal Raman microscopy
Fluorescence: the Ramanist’s enemy
New developments related to Raman spectroscopy
Dispersive Raman versus Fourier-transform Raman
How to amplify the Raman signal?
Fluorescence rejection in time-resolved Raman
Raman implementation in vivo
Selected applications of Raman spectroscopy
Breast calcifications
Kidney stones and kidney biopsies
Gallstones
Prostate tissue and prostatic stones
Testicular microlithiasis
Atherosclerosis
Cartilage
Findings
Conclusion
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