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Caponi S, Fioretto D, Mattarelli M. On the actual spatial resolution of Brillouin Imaging. OPTICS LETTERS 2020; 45:1063-1066. [PMID: 32108770 DOI: 10.1364/ol.385072] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
Brillouin imaging is an emerging optical elastography technique that is able to generate maps of the mechanical properties at microscale with great potential in biophysical and biomedical fields. A key parameter is its spatial resolution, which is usually identified with that of the confocal microscope coupled to the Brillouin interferometer. Conversely, here we demonstrate that the mean free path of acoustic phonons plays a major role in defining the resolution, especially for high numerical aperture confocal setups. Surprisingly, the resolution of elastography maps may even deteriorate when decreasing the scattering volume.
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Mattana S, Caponi S, Tamagnini F, Fioretto D, Palombo F. Viscoelasticity of amyloid plaques in transgenic mouse brain studied by Brillouin microspectroscopy and correlative Raman analysis. JOURNAL OF INNOVATIVE OPTICAL HEALTH SCIENCES 2017; 10:1742001. [PMID: 29151920 PMCID: PMC5687568 DOI: 10.1142/s1793545817420019] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Amyloidopathy is one of the most prominent hallmarks of Alzheimer's disease (AD), the leading cause of dementia worldwide, and is characterized by the accumulation of amyloid plaques in the brain parenchyma. The plaques consist of abnormal deposits mainly composed of an aggregation-prone protein fragment, β-amyloid 1-40/1-42, into the extracellular matrix. Brillouin microspectroscopy is an all-optical contactless technique that is based on the interaction between visible light and longitudinal acoustic waves or phonons, giving access to the viscoelasticity of a sample on a subcellular scale. Here, we describe the first application of micromechanical mapping based on Brillouin scattering spectroscopy to probe the stiffness of individual amyloid plaques in the hippocampal part of the brain of a β-amyloid overexpressing transgenic mouse. Correlative analysis based on Brillouin and Raman microspectroscopy showed that amyloid plaques have a complex structure with a rigid core of β-pleated sheet conformation (β-amyloid) protein surrounded by a softer ring-shaped region richer in lipids and other protein conformations. These preliminary results give a new insight into the plaque biophysics and biomechanics, and a valuable contrast mechanism for the study and diagnosis of amyloidopathy.
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Affiliation(s)
- Sara Mattana
- Department of Physics and Geology, University of Perugia, Perugia I-06123, Italy
| | - Silvia Caponi
- Istituto Officina dei Materiali del CNR (CNR-IOM) - Unità di Perugia Department of Physics and Geology, University of Perugia, Perugia I-06123, Italy
| | - Francesco Tamagnini
- Hatherly Laboratories, Medical School University of Exeter, Exeter EX4 4PS, UK
| | - Daniele Fioretto
- Department of Physics and Geology, University of Perugia, Perugia I-06123, Italy
| | - Francesca Palombo
- School of Physics and Astronomy, University of Exeter, Exeter EX4 4QL, UK
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Masciovecchio C, Battistoni A, Giangrisostomi E, Bencivenga F, Principi E, Mincigrucci R, Cucini R, Gessini A, D'Amico F, Borghes R, Prica M, Chenda V, Scarcia M, Gaio G, Kurdi G, Demidovich A, Danailov MB, Di Cicco A, Filipponi A, Gunnella R, Hatada K, Mahne N, Raimondi L, Svetina C, Godnig R, Abrami A, Zangrando M. EIS: the scattering beamline at FERMI. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:553-564. [PMID: 25931068 DOI: 10.1107/s1600577515003380] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 02/17/2015] [Indexed: 06/04/2023]
Abstract
The Elastic and Inelastic Scattering (EIS) beamline at the free-electron laser FERMI is presented. It consists of two separate end-stations: EIS-TIMEX, dedicated to ultrafast time-resolved studies of matter under extreme and metastable conditions, and EIS-TIMER, dedicated to time-resolved spectroscopy of mesoscopic dynamics in condensed matter. The scientific objectives are discussed and the instrument layout illustrated, together with the results from first exemplifying experiments.
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Affiliation(s)
- Claudio Masciovecchio
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Andrea Battistoni
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Erika Giangrisostomi
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Filippo Bencivenga
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Emiliano Principi
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Riccardo Mincigrucci
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Riccardo Cucini
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Alessandro Gessini
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Francesco D'Amico
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Roberto Borghes
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Milan Prica
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Valentina Chenda
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Martin Scarcia
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Giulio Gaio
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Gabor Kurdi
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Alexander Demidovich
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Miltcho B Danailov
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Andrea Di Cicco
- Physics Division, School of Science and Technology, Università di Camerino, via Madonna delle Carceri 9, I-62032 Camerino (MC), Italy
| | - Adriano Filipponi
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, I-67100 L'Aquila, Italy
| | - Roberto Gunnella
- Physics Division, School of Science and Technology, Università di Camerino, via Madonna delle Carceri 9, I-62032 Camerino (MC), Italy
| | - Keisuke Hatada
- Physics Division, School of Science and Technology, Università di Camerino, via Madonna delle Carceri 9, I-62032 Camerino (MC), Italy
| | - Nicola Mahne
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Lorenzo Raimondi
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Cristian Svetina
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Roberto Godnig
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Alessandro Abrami
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
| | - Marco Zangrando
- Elettra - Sincrotrone Trieste SCpA, SS 14 km 163.5 in AREA Science Park, I-34012 Basovizza, Italy
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Pochylski M, Gapiński J. Simple way to analyze Brillouin spectra from turbid liquids. OPTICS LETTERS 2015; 40:1456-1459. [PMID: 25831358 DOI: 10.1364/ol.40.001456] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The shape of the Brillouin light-scattering spectrum recorded from turbid liquids is distinctly distorted compared to that from a transparent sample. The reason for this is the multiple scattering of light within the medium. The usual expression for the Brillouin spectrum does not apply to the multiple scattering situation. In this Letter, we consider a Brillouin spectrum from opaque samples composed of a distribution of spectra resulting from elementary scattering events, each occurring in single scattering vector conditions. We introduce a one-parameter test function to define the probability distribution of scattering events occurring at a given value of the scattering vector. The proposed procedure was tested on model liquids that consisted of suspensions of sub-micrometer spherical particles of different size and concentration, dispersed in different carrier liquids and studied as a function of temperature. Our analysis made it possible to account for the effect of multiple scattering and to recover the values of mechanical parameters describing the pure solvents.
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