Art -Optical Coherence Tomography News

Articles in category: Art

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1. Training on Application of Optical Coherence Tomography (OCT) to Structural Analysis of Cultural Heritage Objects: June 27–28, 2013 Nicolaus Copernicus University, Torun, Poland
  
  Explore Optical Coherence Tomography News Apr 1 2013 Art
  
  This two-day training event will be dedicated to traditional and innovative applications of optical coherence tomography (OCT) to the examination of cultural heritage objects. The first day will focus on the scientific background and a review of the state-of-the-art of OCT, as well as applications to cultural heritage. The second day will be devoted to hands-on training. Various objects will be provided by the organizers, but participants are encouraged to bring their own samples – contact Piotr Targowski, Nicolaus Copernicus University, ptarg@fizyka.umk.pl for details. There will be no admission fee. Invitation for submission of oral presentations or posters ...
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  Mentions: Nicolaus Copernicus University OCT4ART Piotr Targowski
2. Optimum spectral window for imaging of art with optical coherence tomography
  
  Explore Home - Springer Mar 16 2013 Art
  
  Optical coherence tomography (OCT) has been shown to have potential for important applications in the field of art conservation and archaeology due to its ability to image subsurface microstructures non-invasively. However, its depth of penetration in painted objects is limited due to the strong scattering properties of artists’ paints. VIS–NIR (400–2,400 nm) reflectance spectra of a wide variety of paints made with historic artists’ pigments have been measured. The best spectral window with which to use OCT for the imaging of subsurface structure of paintings was found to be around 2.2 μm. The same spectral window ...
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  Mentions: Wolfgang Drexler Nottingham Trent University Haida Liang
3. How Lasers Are Changing the Study of Art
  
  Explore Home | Duke University Research Aug 21 2012 Art
  
  Shooting a laser at a priceless 14th century painting may seem problematic. But, precisely tuned and timed, the laser system may be the only non-destructive way to get into the mind of long-dead artists like Puccio Capanna and determine his materials, techniques and intent for painting the Crucifixion around 1330 A.D. Duke chemist Warren Warren originally designed the laser system, which uses less power than a laser pointer, to detect changes in the chemicals that give skin cells their color. But one day, while walking through the National Gallery in England, Warren wondered whether his laser system would be ...
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  Mentions: Joseph A. Izatt Duke University William J. Brown
4. Optical Coherence Tomography for the non-invasive investigation of the microstructure of ancient Egyptian faience
  
  Explore ScienceDirect Jul 21 2012 Art
  
  Optical Coherence Tomography (OCT) is a non-invasive subsurface 3D imaging technique based on the Michelson interferometer. The non-invasive nature of OCT and its speed of acquisition makes it possible to image large volumes of intact objects to yield a complete overview of the microstructure. The production methods for ancient Egyptian faience were first investigated using scanning electron microscopy (SEM) imaging of the microstructure in polished sections and microprobe analysis of the composition of the glass phases. These studies were based on original Egyptian faience objects and laboratory reproductions of faience beads made using three different production methods. The microstructure of ...
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  Mentions: Nottingham Trent University Haida Liang
5. Using optical coherence tomography to characterize thick-glaze structure: Chinese Southern Song Guan glaze case study
  
  Explore ingentaconnect.com Apr 18 2012 Art
  
  This study explores the structure characteristics of thick glaze, in terms of the case study of Chinese Southern Song Guan (SSG) ware, focusing on the bubble and its media structure, using a novel focus-tracking optical coherence tomography (OCT) system. The OCT images we obtained not only unveil the structural uniqueness of the thick-glaze SSG sample, but also establish a distinguishable structural pattern for aiding authentication. In addition, information revealed in our images provides a logical explanation for the subtle texture and tone of SSG glaze as well as insights into the technologies used in layering and firing these thick glazes.
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  Mentions: Jennifer K. Barton UC Davis University of Arizona
6. Dual-wavelength multifrequency photothermal wave imaging combined with optical coherence tomography for macrophage and lipid detection in atherosclerotic plaques using gold nanoparticles
  
  Explore Linking to Scitation Content Mar 27 2012 Art , Cardiology
  
  The objective of this study was to assess the ability of combined photothermal wave (PTW) imaging and optical coherence tomography (OCT) to detect, and further characterize the distribution of macrophages (having taken up plasmonic gold nanorose as a contrast agent) and lipid deposits in atherosclerotic plaques. Aortas with atherosclerotic plaques were harvested from nine male New Zealand white rabbits divided into nanorose- and saline-injected groups and were imaged by dual-wavelength (800 and 1210 nm) multifrequency (0.1, 1 and 4 Hz) PTW imaging in combination with OCT. Amplitude PTW images suggest that lateral and depth distribution of nanorose-loaded macrophages (confirmed ...
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  Mentions: Thomas E. Milner Marc D. Feldman University of Texas at Austin
7. Optical Coherence Tomography: its role in the non-invasive structural examination and conservation of cultural heritage objects—a review
  
  Explore SpringerLink Home Nov 25 2011 Art
  
  A brief introduction to Optical Coherence Tomography (OCT) is presented, stressing the origin of the tomographic signal and the detection methods defining various modalities of the technique. The parameters of the tomographs, such as axial and lateral resolution, wavelength and intensity of the probing light, imaging range, time of examination, and sensitivity are then defined, and a paradigm for interpreting the OCT tomograms provided. The second part of the article comprises a review of the utilisation of OCT for structural examination of artworks, illustrated with some representative results. Applications to the structural imaging of semi-transparent subsurface layers such as varnishes ...
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  Mentions: Nicolaus Copernicus University Piotr Targowski
8. High precision dynamic multi-interface profilometry with optical coherence tomography
  
  Explore opticsinfobase.org Nov 1 2011 Art
  
  Optical coherence tomography (OCT) has mostly been used for high-speed volume imaging but its profilometry potentials have not been fully exploited. This paper demonstrates high precision (as good as ∼50 nm) multi-interface profilometry using a Fourier domain OCT system without special antivibration devices. The precision is up to 2 orders of magnitude better than the depth resolution of the OCT. Detailed analysis of the precision achieved for different surfaces is presented. The multi-interface profiles are obtained as a by-product of the tomography data. OCT has the advantage in speed and sensitivity at detecting rough and internal interfaces versus conventional optical ...
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  Mentions: Nottingham Trent University Haida Liang
9. A Bright Future For Lasers In Art Conservation: News From LACONA IX
  
  Explore HERITAGE PORTAL Sep 20 2011 Art
  
  First used for the conservation of artwork around 15 years ago, researchers are now embarking on the use of lasers to clean and restore organic-based materials. Until recently these were considered too delicate for exposure to lasers, compared to inorganic objects. Organic materials ranging from Australian Aboriginal bark paintings to ancient Egyptian papyrus rope are now serving as case studies for demonstrating the effectiveness of lasers for removing dirt and old coats of varnish. One of the drawbacks of laser ablation, however, is the difficulty of ensuring complete removal of the top varnish layer without damaging the surface beneath. This ...
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  Mentions: Nicolaus Copernicus University OCT4ART Piotr Targowski
10. Optical coherence tomography and spectral imaging of a wall painting
  
  Explore Home: SPIE.org Aug 4 2011 Art
  
  There are two reasons for determining the composition of paints used in historical paintings. The first is for conservation purposes, i.e., to identify which conservation methods should be used to best treat an artwork based on its paint composition. The second purpose is art history. For example, some pigments were used in certain periods, while others are more modern. Analysis of the pigments allows art historians to constrain the time when the painting was created, which assists with dating the artwork. Furthermore, pigments can be attributed to geographical areas and are used to shed light on historical pigment trade ...
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  Mentions: Nottingham Trent University Haida Liang
11. Review of several optical non-destructive analyses of an easel painting. Complementarity and crosschecking of the results
  
  Explore ScienceDirect Jun 23 2011 Art
  
  Five optical analyses of a given work of art are presented, using multispectral imaging, optical coherence tomography, goniophometry, UV-fluorescence emission spectroscopy and diffuse reflectance spectroscopy. All these methods are non-destructive, contactless, and implementable in situ. They all lead to results in quasi-real time. The multispectral camera allows imaging of the whole painting with very high definition and recording of 240 millions of spectra. Optical coherence tomography allows local 2D and 3D imaging with in-face and in depth stratigraphies inside the painting with a micrometric accuracy. It allows the evaluation of the pigment volume concentration inside a layer, the measurement of ...
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  Mentions: Université Pierre et Marie Curie Mady Elias
12. Non-invasive investigations of a wall painting using optical coherence tomography and hyperspectral imaging
  
  Explore SPIE Digital Library Jun 9 2011 Art
  
  Multispectral and hyperspectral imaging are efficient methods of measuring spectral reflectance at high spatial resolution. This non-invasive technique has been applied to the imaging of paintings over the last 20 years. PRISMS (Portable Remote Imaging System for Multispectral Scanning) was designed specifically for imaging wall paintings. Optical Coherence Tomography (OCT) is a low coherence interferometric technique capable of fast non-invasive imaging of subsurface microstructure. This paper shows the first application of in situ OCT imaging of a wall painting. The combination of PRISMS and OCT gives information on the varnish and paint layer structure, pigment identification, the state of degradation ...
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  Mentions: Nottingham Trent University Haida Liang
13. Application of optical coherence tomography (OCT) for real time monitoring of consolidation of the paint layer in Hinterglasmalerei objects
  
  Explore SPIE Digital Library Jun 9 2011 Art
  
  Optical coherence tomography (OCT) is a fast non-contact and non-invasive technique for examination of objects consisting of transparent or semitransparent layers. Since it is a useful tool for inspection of Hinterglasmalerei paintings, the aim of the experiment was to explore its feasibility for monitoring of the consolidation process, which plays the most important role in the conservation treatment of such artefacts.
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  Mentions: Nicolaus Copernicus University Piotr Targowski Marcin Sylwestrzak
14. OCT and NMR for non-invasive in-situ monitoring of the vulnerability of rock art monuments
  
  Explore SPIE Digital Library Jun 6 2011 Art , NDE/NDT
  
  This paper will introduce a new application of Optical Coherence Tomography (OCT) to the monitoring of vulnerability of rock art monuments in-situ. The porosity of the host rock is an important factor affecting the susceptibility of rock art monuments to decay. Pore characteristics of rocks are one of the main factors that control the intensity of physical deterioration. OCT has successfully been applied to paintings and archaeological objects, including geological materials, to produce cross sectional images non-invasively. The stack of cross sectional images can be rendered as a volume to visualise the structure in depth over an extended area. Preliminary ...
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  Mentions: Nottingham Trent University Haida Liang
15. Medical Imaging Used to Probe Tower of London Mural (Video)
  
  Explore newscientist.com Nov 9 2010 Art
  
  Tucked away in the Tower of London, a mysterious wall painting has been intriguing art historians. Commonly called the Byward Angel, it's one of the most well-preserved murals in the UK and the only surviving medieval interior at the castle. The style of the painting suggests it dates back to the 1390s - but nobody knows who painted it or why it's there. Until recently, investigating the mural has been a painstaking task as it could only be analysed invasively by taking tiny samples of paint. Now, Haida Liang and her team from Nottingham Trent University have repurposed a ...
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  Mentions: Nottingham Trent University Haida Liang
16. OCT system to examine priceless paintings
  
  Explore Engineering News & Engineering Jobs Sep 9 2010 Art , Funding
  
  A team of researchers from Nottingham Trent University have received more than £600,000 of funding to develop a new Optical Coherence Tomography (OCT) system that they hope will become a tool used by art galleries around the world. The funding was received from the Science and Heritage Programme of the Arts and Humanities Research Council (AHRC) and the EPSRC. Since 2004, Dr Haida Liang from the university’s School of Science and Technology has led research into the application of Optical Coherence Tomography (OCT) for the non-invasive examination of paintings.
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  Mentions: Nottingham Trent University Haida Liang
17. They go through the pictures without touching them! (A Swiss Television Video on OCT in Art)
  
  Explore Nouvelles tendances & technologies Jul 5 2010 Art
  
  Text translation of the web page can be obtained using Google Language Tools. A new technique useful in the restoration attracting interest from major museums. Using a method derived from ophthalmology, researchers are able to get inside even works of art! Its name: optical coherence tomography. In the restoration workshops of the Museum of Art and History in Geneva, a romantic landscape painter undergoes a battery of tests. Fluorescence ultraviolet light to diagnose the condition of the varnish, and then exposed to a raking light to explore the contours of the material, Victor Lopes, the conservator of places, has ten ...
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  Mentions: Université Pierre et Marie Curie Nicolaus Copernicus University Mady Elias
18. Contribution of surface state characterization to studies of works of art
  
  Explore opticsinfobase.org Apr 6 2010 Art
  
  This paper has two purposes. The first one underlines that qualitative and quantitative studies of surface states lead to relevant information for analyzing works of art, with lots of potential for art history, restorers, and curators. The discrimination between different artistic techniques and the influence of a varnish on the leveling of paint surfaces are presented. The second purpose is the comparison between different nondestructive optical topographic methods, i.e., goniophotometry, optical coherence topography, and confocal microscopy, according to their accuracy, their discriminatory ability, their practicability inside a museum, and the size limits of the studied objects.
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  Mentions: Université Pierre et Marie Curie Mady Elias Jean-Marc Frigerio
19. Two New Methods Lend Scientific Muscle To Detecting Art Forgeries
  
  Explore io9. We come from the future. Feb 10 2010 Art
  
  If you're looking to sell some phony art, your time appears to be running out. Dartmouth researchers can spot art forgeries using neuroscience techniques, while Polish scientists use medical imaging technology to do likewise. The Dartmouth College team of James Hughes, Daniel Graham, and Daniel Rockmore took an established part of neuroscience - the notion of sparse coding - and applied it to the art world. Sparse coding technology imitates the human visual system by attempting to replicate the ways in which the brain takes complex images and breaks them down into simple patterns thanks to a series of filter neurons ...
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  Mentions: Nicolaus Copernicus University Piotr Targowski
20. Imaging method for eye disease used to eye art forgeries
  
  Explore PhysOrg.com Feb 3 2010 Art
  
  Scientists in Poland are describing how a medical imaging technique has taken on a second life in revealing forgery of an artist's signature and changes in inscriptions on paintings that are hundreds of years old. A report on the technique, called optical coherence tomography (OCT), is in ACS' Accounts of Chemical Research. Piotr Targowski notes that easel paintings prepared according to traditional techniques consist of multiple layers. The artist, for instance, first applies a glue sizing over the canvas to ensure proper adhesion of later layers. Those layers may include an outline of the painting, the painting itself, layers ...
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  Mentions: Nicolaus Copernicus University Piotr Targowski
21. Structural Examination of Easel Paintings with Optical Coherence Tomography
  
  Explore ACS Publications Home Page Dec 31 2009 Art
  
  Identification of the order, thickness, composition, and possibly the origin of the paint layers forming the structure of a painting, that is, its stratigraphy, is important in confirming its attribution and history as well as planning conservation treatments. The most common method of examination is analysis of a sample collected from the art object, both visually with a microscope and instrumentally through a variety of sophisticated, modern analytical tools. Because of its invasiveness, however, sampling is less than ideally compatible with conservation ethics; it is severely restricted with respect to the amount of material extirpated from the artwork. Sampling is ...
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  Mentions: Nicolaus Copernicus University Piotr Targowski Marcin Sylwestrzak
22. Speckle noise reduction in optical coherence tomography of paint layers
  
  Explore opticsinfobase.org Dec 21 2009 Art , NDE/NDT , Other Non-Medical
  
  We present and characterize a sequential angular compounding method for reducing speckle contrast in optical coherence tomography images of paint layers. The results are compared with postprocessing methods, and we show that the compounding technique can improve the speckle contrast ratio in B-scans by better than a factor of 2 in exchange for a negligible loss of resolution. As a result, image aesthetics are improved, thin layers become more distinct, and edge-detection algorithms work more efficiently. The effect of varying the angular scan size and number of averages is investigated, and it is found that a degree of statistical correlation ...
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  Mentions: Adrian G. Podoleanu University of Kent
23. The Nature of the Extraordinary Finish of Stradivaris Instruments
  
  Explore www3.interscience.wiley.com Dec 13 2009 Art
  
  The composition of Stradivari\9s varnish has raised numerous hypotheses and controversies for the past two centuries, although a clear understanding of the materials could not be reached. In their Communication (DOI: 10.1002/anie.200905131), J.-P. Echard et al. describe the chemical stratigraphy of the varnishes from five representative Stradivari instruments by using a wide array of analytical techniques. In particular, Stradivari used several red pigments, and may have sought a variety of tints to give his instruments their beautiful appearance.
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  Mentions: Jean-Philippe Echard Stéphane Vaiedelich Balthazar Soulier
24. Feature Of The Week 12/13/09: Using Optical Coherence Tomography to Study Wood and Wood Finishes on an 18th century Italian violin
  
  Explore Optical Coherence Tomography News Dec 13 2009 Art
  
  Feature Of The Week 12/13/09: When available, non-contact, non-destructive and in situ techniques are very much favoured to study the cultural heritage artefacts that are precious witnesses of the past, by limiting the number of micro-samples. Optical Coherence Tomography (OCT) is then especially attractive. OCT potentially allows a better representativity than techniques which require a sample, by increasing the number of instruments studied and the number of measurements on each instrument. During the past few years, many applications of OCT have been reported in the field of art technology and art conservation. An original full-field time-domain OCT system ...
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  Mentions: Université Pierre et Marie Curie Mady Elias Gaël Latour
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