1
|
Lenz AJM, Clemente P, Climent V, Lancis J, Tajahuerce E. Imaging the optical properties of turbid media with single-pixel detection based on the Kubelka-Munk model. Opt Lett 2019; 44:4797-4800. [PMID: 31568445 DOI: 10.1364/ol.44.004797] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 08/31/2019] [Indexed: 06/10/2023]
Abstract
We present a diffuse optical imaging system with structured illumination and integrated detection based on the Kubelka-Munk light propagation model for the spatial characterization of scattering and absorption properties of turbid media. The proposed system is based on the application of single-pixel imaging techniques. Our strategy allows us to retrieve images of the absorption and scattering properties of a turbid media slab by using integrating spheres with photodiodes as bucket detectors. We validate our idea by imaging the absorption and scattering coefficients of a spatially heterogeneous phantom.
Collapse
|
2
|
Filograna R, Koolmeister C, Upadhyay M, Pajak A, Clemente P, Wibom R, Simard ML, Wredenberg A, Freyer C, Stewart JB, Larsson NG. Modulation of mtDNA copy number ameliorates the pathological consequences of a heteroplasmic mtDNA mutation in the mouse. Sci Adv 2019; 5:eaav9824. [PMID: 30949583 PMCID: PMC6447380 DOI: 10.1126/sciadv.aav9824] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 02/11/2019] [Indexed: 05/18/2023]
Abstract
Heteroplasmic mtDNA mutations typically act in a recessive way and cause mitochondrial disease only if present above a certain threshold level. We have experimentally investigated to what extent the absolute levels of wild-type (WT) mtDNA influence disease manifestations by manipulating TFAM levels in mice with a heteroplasmic mtDNA mutation in the tRNAAla gene. Increase of total mtDNA levels ameliorated pathology in multiple tissues, although the levels of heteroplasmy remained the same. A reduction in mtDNA levels worsened the phenotype in postmitotic tissues, such as heart, whereas there was an unexpected beneficial effect in rapidly proliferating tissues, such as colon, because of enhanced clonal expansion and selective elimination of mutated mtDNA. The absolute levels of WT mtDNA are thus an important determinant of the pathological manifestations, suggesting that pharmacological or gene therapy approaches to selectively increase mtDNA copy number provide a potential treatment strategy for human mtDNA mutation disease.
Collapse
Affiliation(s)
- R. Filograna
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
| | - C. Koolmeister
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
| | - M. Upadhyay
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
| | - A. Pajak
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
| | - P. Clemente
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
| | - R. Wibom
- Center for Inherited Metabolic Diseases, Karolinska University Hospital, S-171 76 Stockholm, Sweden
| | - M. L. Simard
- Department of Mitochondrial Biology, Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany
| | - A. Wredenberg
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
- Center for Inherited Metabolic Diseases, Karolinska University Hospital, S-171 76 Stockholm, Sweden
| | - C. Freyer
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
- Center for Inherited Metabolic Diseases, Karolinska University Hospital, S-171 76 Stockholm, Sweden
| | - J. B. Stewart
- Department of Mitochondrial Biology, Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany
| | - N. G. Larsson
- Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden
- Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden
- Center for Inherited Metabolic Diseases, Karolinska University Hospital, S-171 76 Stockholm, Sweden
- Department of Mitochondrial Biology, Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany
- Corresponding author.
| |
Collapse
|
3
|
Jauregui-Sánchez Y, Clemente P, Lancis J, Tajahuerce E. Single-pixel imaging with Fourier filtering: application to vision through scattering media. Opt Lett 2019; 44:679-682. [PMID: 30702709 DOI: 10.1364/ol.44.000679] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 12/22/2018] [Indexed: 06/09/2023]
Abstract
We present a novel approach for imaging through scattering media that combines the principles of Fourier spatial filtering and single-pixel imaging. We compare the performance of our single-pixel imaging setup with that of a conventional system. First, we show that a single-pixel camera does not reduce the frequency content of the object, when a small pinhole is used as a low-pass filter at the detection side. Second, we show that the introduction of Fourier gating improves the contrast of imaging through scattering media in both optical systems. We conclude that single-pixel imaging fits better than conventional imaging on imaging through scattering media by the Fourier gating.
Collapse
|
4
|
Soldevila F, Clemente P, Tajahuerce E, Uribe-Patarroyo N, Andrés P, Lancis J. Computational imaging with a balanced detector. Sci Rep 2016; 6:29181. [PMID: 27353733 PMCID: PMC4926225 DOI: 10.1038/srep29181] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 06/15/2016] [Indexed: 11/16/2022] Open
Abstract
Single-pixel cameras allow to obtain images in a wide range of challenging scenarios, including broad regions of the electromagnetic spectrum and through scattering media. However, there still exist several drawbacks that single-pixel architectures must address, such as acquisition speed and imaging in the presence of ambient light. In this work we introduce balanced detection in combination with simultaneous complementary illumination in a single-pixel camera. This approach enables to acquire information even when the power of the parasite signal is higher than the signal itself. Furthermore, this novel detection scheme increases both the frame rate and the signal-to-noise ratio of the system. By means of a fast digital micromirror device together with a low numerical aperture collecting system, we are able to produce a live-feed video with a resolution of 64 × 64 pixels at 5 Hz. With advanced undersampling techniques, such as compressive sensing, we can acquire information at rates of 25 Hz. By using this strategy, we foresee real-time biological imaging with large area detectors in conditions where array sensors are unable to operate properly, such as infrared imaging and dealing with objects embedded in turbid media.
Collapse
Affiliation(s)
- F. Soldevila
- GROC·UJI, Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| | - P. Clemente
- Servei Central d’Instrumentació Científica (SCIC), Universitat Jaume I, E12071 Castelló, Spain
| | - E. Tajahuerce
- GROC·UJI, Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| | - N. Uribe-Patarroyo
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, Boston, Massachusetts 02114, USA
| | - P. Andrés
- Facultat de Física, Universitat de València, E46100 Burjassot, Spain
| | - J. Lancis
- GROC·UJI, Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| |
Collapse
|
5
|
Soldevila F, Salvador-Balaguer E, Clemente P, Tajahuerce E, Lancis J. High-resolution adaptive imaging with a single photodiode. Sci Rep 2015; 5:14300. [PMID: 26382114 PMCID: PMC4585607 DOI: 10.1038/srep14300] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/18/2015] [Indexed: 11/10/2022] Open
Abstract
During the past few years, the emergence of spatial light modulators operating at the tens of kHz has enabled new imaging modalities based on single-pixel photodetectors. The nature of single-pixel imaging enforces a reciprocal relationship between frame rate and image size. Compressive imaging methods allow images to be reconstructed from a number of projections that is only a fraction of the number of pixels. In microscopy, single-pixel imaging is capable of producing images with a moderate size of 128 × 128 pixels at frame rates under one Hz. Recently, there has been considerable interest in the development of advanced techniques for high-resolution real-time operation in applications such as biological microscopy. Here, we introduce an adaptive compressive technique based on wavelet trees within this framework. In our adaptive approach, the resolution of the projecting patterns remains deliberately small, which is crucial to avoid the demanding memory requirements of compressive sensing algorithms. At pattern projection rates of 22.7 kHz, our technique would enable to obtain 128 × 128 pixel images at frame rates around 3 Hz. In our experiments, we have demonstrated a cost-effective solution employing a commercial projection display.
Collapse
Affiliation(s)
- F Soldevila
- GROC.UJI, Departament de Física, Universitat Jaume I, E12071 Castelló, Spain.,Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| | - E Salvador-Balaguer
- GROC.UJI, Departament de Física, Universitat Jaume I, E12071 Castelló, Spain.,Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| | - P Clemente
- GROC.UJI, Departament de Física, Universitat Jaume I, E12071 Castelló, Spain.,Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain.,Servei Central d'Instrumentació Científica (SCIC), Universitat Jaume I, E12071 Castelló, Spain
| | - E Tajahuerce
- GROC.UJI, Departament de Física, Universitat Jaume I, E12071 Castelló, Spain.,Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| | - J Lancis
- GROC.UJI, Departament de Física, Universitat Jaume I, E12071 Castelló, Spain.,Institute of New Imaging Technologies (INIT), Universitat Jaume I, E12071 Castelló, Spain
| |
Collapse
|
6
|
Durán V, Soldevila F, Irles E, Clemente P, Tajahuerce E, Andrés P, Lancis J. Compressive imaging in scattering media. Opt Express 2015; 23:14424-14433. [PMID: 26072804 DOI: 10.1364/oe.23.014424] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
One challenge that has long held the attention of scientists is that of clearly seeing objects hidden by turbid media, as smoke, fog or biological tissue, which has major implications in fields such as remote sensing or early diagnosis of diseases. Here, we combine structured incoherent illumination and bucket detection for imaging an absorbing object completely embedded in a scattering medium. A sequence of low-intensity microstructured light patterns is launched onto the object, whose image is accurately reconstructed through the light fluctuations measured by a single-pixel detector. Our technique is noninvasive, does not require coherent sources, raster scanning nor time-gated detection and benefits from the compressive sensing strategy. As a proof of concept, we experimentally retrieve the image of a transilluminated target both sandwiched between two holographic diffusers and embedded in a 6mm-thick sample of chicken breast.
Collapse
|
7
|
Rodríguez AD, Clemente P, Irles E, Tajahuerce E, Lancis J. Resolution analysis in computational imaging with patterned illumination and bucket detection. Opt Lett 2014; 39:3888-3891. [PMID: 24978763 DOI: 10.1364/ol.39.003888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In computational imaging by pattern projection, a sequence of microstructured light patterns codified onto a programmable spatial light modulator is used to sample an object. The patterns are used as generalized measurement modes where the object information is expressed. In this Letter, we show that the resolution of the recovered image is only limited by the numerical aperture of the projecting optics regardless of the quality of the collection optics. We provide proof-of-principle experiments where the single-pixel detection strategy outperforms the resolution achieved using a conventional optical array detector for optical imaging. It is advantageous in the presence of real-world conditions, such as optical aberrations and optical imperfections in between the sample and the sensor. We provide experimental verification of image retrieval even when an optical diffuser prevents imaging with a megapixel array camera.
Collapse
|
8
|
Clemente P, Durán V, Martínez-León L, Climent V, Tajahuerce E, Lancis J. Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal-on-silicon display. Opt Express 2008; 16:1965-1974. [PMID: 18542276 DOI: 10.1364/oe.16.001965] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We provide experimental measurement of the Mueller matrices corresponding to an on-state liquid-crystal-on-silicon display as a function of the addressed voltage. The polar decomposition of the Mueller matrices determines the polarization properties of the device in terms of a diattenuation, a retardance and a depolarization effect. Although the diattenuation effect is shown to be negligible for the display, the behavior of the degree of polarization as a function of the input polarization state shows a maximum coupling of linearly polarized light into unpolarized light of about 10%. Concerning the retardation effect, we find that the display behaves as a retarder with a fast-axis orientation and a retardance angle that are voltage-dependent. The above decomposition provides a convenient framework to optimize the optical response of the display for achieving a phase-mostly modulation regime. To this end, the display is sandwiched between a polarization state generator and a polarization state analyzer. Laboratory results for a commercial panel show a phase modulation depth of 360 masculine at 633 nm with a residual intensity variation lower than 6 %.
Collapse
Affiliation(s)
- P Clemente
- Servei Central d'Instrumentació Científica, Universitat Jaume I, E12080 Castelló, Spain
| | | | | | | | | | | |
Collapse
|
9
|
Dejonckere PH, Bradley P, Clemente P, Cornut G, Crevier-Buchman L, Friedrich G, Van De Heyning P, Remacle M, Woisard V. A basic protocol for functional assessment of voice pathology, especially for investigating the efficacy of (phonosurgical) treatments and evaluating new assessment techniques. Guideline elaborated by the Committee on Phoniatrics of the European Laryngological Society (ELS). Eur Arch Otorhinolaryngol 2001; 258:77-82. [PMID: 11307610 DOI: 10.1007/s004050000299] [Citation(s) in RCA: 689] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The proposal of this basic protocol is an attempt to reach better agreement and uniformity concerning the methodology for functional assessment of pathologic voices. The purpose is to allow relevant comparisons with the literature when presenting/publishing the results of voice treatment, e.g. a phonosurgical technique, or a new/improved instrument or procedure for investigating the pathological voice. Meta-analyses of the results of voice treatments are generally limited and may even be impossible owing to the major diversity in the ways functional outcomes are assessed. A multidimensional set of minimal basic measurements suitable for all "common" dysphonias is proposed. It includes five different approaches: perception (grade, roughness, breathiness), videostroboscopy (closure, regularity, mucosal wave and symmetry), acoustics (jitter, shimmer, Fo-range and softest intensity), aerodynamics (phonation quotient), and subjective rating by the patient. The protocol is elaborated on the basis of an exhaustive review of the literature, of the experience of the Committee members, and of plenary discussions within the European Laryngological Society. Instrumentation is kept to a minimum, but it is considered essential for professionals performing phonosurgery.
Collapse
Affiliation(s)
- P H Dejonckere
- Institute of Phoniatrics, University Medical Centre Utrecht, AZU F.02.504, P.O. Box 85500, Nl-3508 GA Utrecht, The Netherlands.
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Di Sciascio G, Calò P, Clemente P. Can SSRI induce mania? Eur Psychiatry 1998. [DOI: 10.1016/s0924-9338(99)80399-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
|
11
|
Abstract
The present paper reports on experience gathered with the first 140 implantations of the Kelman II anterior chamber lens following intracapsular cataract extraction (ICCE). The technique of ICCE combined with lens implantation is described; the possible complications and the advantages of this new lens type are pointed out. With smooth implantation there have so far been no serious complications due to the lens, such as keratopathy, lens dislocation, secondary glaucoma, chronic iritis or membrane inflammation. The IC technique excludes the possibility of secondary cataract.
Collapse
|
12
|
Abstract
In order to obtain a more permanent regulation of I.O.P. the size of the usual 20 mm2 scleral flap is reduced by about one half. Instead of the quadrangular scleral flap a lamellar triangular flap of 5 mm side length is prepared. This corresponds with a surface area of ca.10 mm2. The reduction of the scleral flap and accordingly the scleral wound does not lead to any disadvantages as compared to the method of Fronimopoulos. The advantages, however, are a significant shortening of the filtration path with less scarring tendency and a simpler way of preparing the scleral flap. Also in the combination of cataract and glaucoma operations the triangular scleral flap was found to be useful.
Collapse
|
13
|
Menotti A, Signoretti P, Cianti C, Angelico F, Bucci A, Clemente P, Giuliani A, Trezzini C, Ricci G. ["Community" treatment in arterial hypertension. Preliminary trials in the Rome Project for the Prevention of Coronary Cardiopathy]. Clin Ter 1977; 82:31-44. [PMID: 902462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|