1. Optical Coherence Tomography News

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    1. Feature Of The Week 4/26/09: Linear-Wavenumber Spectrometer for High-Speed Spectral-Domain Optical Coherence Tomography

      Feature Of The Week 4/26/09: Linear-Wavenumber Spectrometer for High-Speed Spectral-Domain Optical Coherence Tomography
      Feature Of The Week 4/26/09: Spectral-domain optical coherence tomography (SD OCT) is based on measuring of optical spectrum of sum of two interfering waves: the reference one and the backscattered from the object one. The information about object inner structure is reconstructed by inverse Fourier transform of optical spectrum. The Fast Fourier transform (FFT) is used to get maximized processing speed. Using FFT has in mind strongly equally spaced (by argument) samples (in SD OCT argument is optical frequency of receiving light). In real systems this equidistance is guaranteed only with some accuracy. This results in distortion and ...
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    2. Feature Of The Week 4/19/09: Dual Window Method for Processing SOCT Signals with High Spectral and Temporal Resolution

      Feature Of The Week 4/19/09: Dual Window Method for Processing SOCT Signals with High Spectral and Temporal Resolution
      Feature Of The Week 4/19/09. In spectroscopic optical coherence tomogramphy (SOCT), both the intensity and the spectrum of scattered light is obtained; thus, through spectral analysis and coherence gating, one can increase the information content of OCT signals and obtain functional information of tissue. Moreover, in order to resolve depth varying signals, several methods have been employed including short time Fourier transform (STFT), Cohen’s time frequency distributions (TFDs), and model based TFDs. Unfortunately, these methods suffer from several drawbacks, including a trade-off between temporal/depth and spectroscopic/wavelength resolution, the requirement that knowledge of complex fields rather ...
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    3. Feature Of The Week 4/5/09: In-vivo Optical Coherence Tomography from a Hand-Held Probe

      Feature Of The Week 4/5/09: In-vivo Optical Coherence Tomography from a Hand-Held Probe
      Feature of the week 4/5/09: Many OCT systems, particularly microscopy systems, have fixed probe modules where samples are brought to the OCT system. Several papers have been published on hand-held probes which instead bring the OCT system to the sample. Applications such as cardiology and endoscopy have long brought the light to the sample, but the engineering challenges of hand-held microscopy, ophthalmology, or NDE application are quite different. Several factors enable hand-held probes including: fiber-optic systems decouple the OCT engine from the probe; speed capabilities of Fourier domain detection minimize motion induced artifacts; and improvements in miniature scanning ...
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    4. OCT imaging consultants/applications-experts sought by Michelson Diagnostics

      OCT imaging consultants/applications-experts sought by Michelson Diagnostics
      Michelson Diagnostics seeks consultants with expertise in imaging, especially OCT, to assist with demonstrations and evaluation trials of its Multi-Beam OCT technology at customer sites in US and Germany. The consultants will provide local technical expertise, to help scientific and clinical custome
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    5. Ophthalmic Optical Coherence Tomography Market: Past, Present, & Future

      In 1992 the first commercial optical coherence tomography (OCT) company was started. It was called Advanced Ophthalmic Devices (AOD) and as the name implies was focused on the ophthalmology market. AOD grew out of research at the Massachusetts Institute of Technology, Massachusetts Eye and Ear Infir
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    6. Feature Of The Week 3/22/09: Increased Penetration Depth in Optical Coherence Tomography using Hyper-Osmotic Agents

      Feature Of The Week 3/22/09: Increased Penetration Depth in Optical Coherence Tomography using Hyper-Osmotic Agents
      Feature Of The Week 3/22/09: Penetration depth has always been an Achilles’ heel for OCT. Ophthalmologists have enjoyed the transparency of the eye to allow high efficiency transmission of light to and from the retina. For other applications such as dermatology the strong light scattering of surface skin represents a fundamental challenge. There have been numerous studies on methods to increase penetration depth including optical clearing agents and mechanical techniques. One technique being investigated at Nankai University by Xiaonong Zhu et al is the use of hyper-osmotic agents. Shown here are OCT images of a forefinger obtained without ...
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    7. Lightlab Imaging, Axsun Technologies, and Volcano Corporation in Legal Dispute

      Lightlab Imaging, Axsun Technologies, and Volcano Corporation in Legal Dispute
      Volcano Corporation's recent Securities and Exchange Commission 10-k filing announced a suit by Lightlab Imaging against Axsun Technologies and Volcano Corporation. Some background information that may be relevant to this court case: On January 7, 2009 Lightlab Imaging filed suit against Axsun Technologies and Volcano Corporation in the Business Litigation Section of the Superior Court of Massachusetts. On December 10, 2007, Volcano, a leading supplier in Intravascular Ultrasound (IVUS) equipment acquired startup company CardioSpectra for ~$55M ($25M plus an additional ~$30M earnout). According to the press release, "CardioSpectra's unique OCT imaging system is expected to complement Volcano's ...
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    8. Feature Of The Week 3/8/09: MEMS micromirror with dual-reflective surfaces for circumferential scanning endoscopic OCT imaging

      Feature Of The Week 3/8/09: MEMS micromirror with dual-reflective surfaces for circumferential scanning endoscopic OCT imaging
      Feature Of The Week 3/8/09: Optical endoscopic imaging based on high-resolution, cross-sectional imaging techniques such as optical coherence tomography and non-linear optical imaging has demonstrated a great potential for non-invasive, in vivo clinical applications especially after MEMS probe scanning mirrors are employed as the scanning mechanisms. For intravascular and some internal organ imaging applications, imaging probes with full circumferential scanning (FCS) capability are highly desired. Professor Huikai Xie, PhD Student Lei Wu, and others from the University of Florida, have made some very impressive MEMS scanner designs. This video shows a dual-reflective MEMS mirror using a dual-folded electrothermal ...
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    9. Feature Of The Week 3/1/09: Optical Coherence Tomography to Improve Diagnostic and Therapeutic Bronchoscopy

      Feature Of The Week 3/1/09: Optical Coherence Tomography to Improve Diagnostic and Therapeutic Bronchoscopy
      Feature Of The Week 3/1/09: Ophthalmic and Cardiovascular applications are two of the leading commercialized areas of OCT. There are an ever increasing number of applications poised to make the successful transition to commercialization thanks to progress by researchers around the world. One such area is Bronchoscopy where, for example, researchers at University of Western Australia and Sir Charles Gairdner Hospital have been very active. A recent publication by Jonathan P. Williamson et al presents new work on anatomical optical coherence tomography to accurately measure diameter and lumen area of the central airways during bronchoscopy. This study describes ...
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    10. Feature Of The Week 2/22/09: Self-Assembled Quantum Dots for High-Performance Broadband Optical Coherence Tomography Sources

      Feature Of The Week 2/22/09: Self-Assembled Quantum Dots for High-Performance Broadband Optical Coherence Tomography Sources
      Feature Of The Week 2/22/09: The development of low-cost, compact, and high-power broadband sources for OCT applications is a very interesting research area being pursued in a number of research laboratories and companies around the world. Superluminescent light emiting diodes (SLEDs), in particular, have made tremendous progress towards a commercializable low-cost source for point of care screening and diagnostics OCT systems. Self-assembled quantum dots (SAQD) are a new and exciting class of nanomaterials which are leading to a revolution in the development of high power and broadband SLEDs, most recently by utilizing their natural broad emission spectra due ...
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    11. Feature Of The Week 2/13/09: Common-Path Optical Coherence Tomography Using an Integrated Fiber Microlens

      Feature Of The Week 2/13/09: Common-Path Optical Coherence Tomography Using an Integrated Fiber Microlens
      Feature Of The Week 2/13/09: Common-path optical coherence tomography systems have a variety of advantages over traditional interferometer implementations in certain applications. These include compactness, stability, tolerance to group velocity dispersion, and polarization missmatch since the sample arm and reference arm, to a high degree, share the same path. A recent paper by Khay Ming Tan et al from the University of St. Andrews demonstrates this in a Fourier-Domain OCT system where they integrate the reference reflection and a fiber micro-lens and discuss applications such as needle biopsy and endoscopy. For more information see article. article. Click "toggle ...
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    12. Feature Of The Week 2/8/09: Application of Optical Coherence Tomography to Deep Lamellar Endothelial Keratoplasty (DLEK) Procedures

      Feature Of The Week 2/8/09: Application of Optical Coherence Tomography to Deep Lamellar Endothelial Keratoplasty (DLEK) Procedures
      Feature Of The Week 2/8/09: OCT has had a dramatic impact on ophthalmology over the past 20 years. Evolving from a scientific concept to a main stream imaging and diagnostic tool used world wide. Next generation Fourier domain systems are now commercialized and offering major advances such as 3D data sets and functional imaging in acquisition times and resolutions that yesterday's 2D system could not achieve. Improved imaging is synergistic with new surgical techniques. For example, laser vision correction has become one of the fastest-growing disciplines in medicine. A fairly new corneal transplant procedure called deep lamellar ...
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    13. Feature Of The Week 1/31/09: Polarization-Sensitive Optical Coherence Tomography Imaging of Demineralization on Tooth Surfaces

      Feature Of The Week 1/31/09: Polarization-Sensitive Optical Coherence Tomography Imaging of Demineralization on Tooth Surfaces
      Feature Of The Week 1/31/09: The promise of low-cost, high-resolution, non-ionizing imaging for dentistry continues to spur research and commercial activity. Daniel Fried, a professor from UCSF, has done a lot of interesting work on OCT applications in dentistry. One recent publication shows PS-OCT imaging of demineralization of tooth roots. This figure contains three images: Top/A Polarized Light Microscopy (PLM), Center/B microradiography (TMR); and bottom/C PS-OCT. The PS-OCT B-scan image is of the orthogonal polarization state, taken across a block of human dentin after exposure of the block to a solution designed to cause subsurface ...
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    14. Feature Of The Week 1/25/09: Fourier Domain a Hugh Boost to Optical Coherence Tomography for Cardiovascular Applications

      Feature Of The Week 1/25/09: Fourier Domain a Hugh Boost to Optical Coherence Tomography for Cardiovascular Applications
      Feature Of The Week 1/25/09: By the early 1990's both Ophthalmology and Cardiology were being investigated as potential applications of OCT (see for example Huang et al). But while OCT for ophthalmologic exams developed into a main stream application in less than 10 years with well over 10,000 units currently fielded, 100,000’s patients diagnosed, and over $200M/year in revenue for a variety of Companies, cardiology has lagged behind. This is due to a variety of issues including the more invasive and complex nature of the procedure and the implicit demand on the technology ...
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    15. Feature Of The Week 1/18/09: Shedding New Light on Early Caries Detection with Optical Coherence Tomography

      Feature Of The Week 1/18/09: Shedding New Light on Early Caries Detection with Optical Coherence Tomography
      Feature Of The Week 1/18/09: Dentistry continues to develop as an exciting application of OCT. The promise of high resolution imaging and identification of new features via non-ionization radiation has captured both research interest as well as commercial interest. This OCT movie shows a scan across the surface of a tooth near the Dental Enamel Junction (DEJ). Image courtesy of Dr. Lin-P'ing Choo-Smith from the University of Manitoba and NRCC. For more information a recent paper by Dr. Choo-Smith et al published in the Journal of the Canadian Dental Association can be seen here. Click "toggle fullscreen ...
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    16. Volcano Corporation Makes Big Bets on Optical Coherence Tomography: Projects OCT Cardiology & Related Markets At More Than $1B

      Volcano Corporation Makes Big Bets on Optical Coherence Tomography: Projects OCT Cardiology & Related Markets At More Than $1B
      Volcano Corporation, a leading company in the IVUS, seems to be a big believer in the OCT cardiology market and is backing that belief with big bets. Last year Volcano acquired CardioSpectra (a 2 year old startup company out of the University of Texas at Austin) for $63M ($25M plus an additional $38M earn out). See article. More recently Volcano acquired Axsun Technologies (a leading company in micro-optical systems technology) for $21.5M mainly for their high performance compact swept-source laser. See article. A laser their main OCT competitor Lightlab Imaging (a leading company in the OCT space) claimed to ...
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    17. Michelson Diagnostics Release Preliminary Specifications for Clinical Hand-Held OCT Probe

      Michelson Diagnostics Release Preliminary Specifications for Clinical Hand-Held OCT Probe
      Michelson Diagnostics has issued a preliminary specification for its clinical Optical Coherence Tomography (OCT) probe and processing system, which the company says is planned for launch in late spring 2009. The new OCT system has been given the name ‘Vivosight’. Preliminary specifications for the new release can be seen here. Two variants of the new Vivosight probe are specified, one is a version with X-Y scanning, to enable 3D mapping of flat tissue such as skin, and the other is a version equipped with a rigid endoscope, suitable for internal applications. The unique multi-beam design provides double the image resolution ...
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    18. Lightlab Imaging Leads Global Advancement of Intracoronary Imaging

      Finishes 2008 with More Than 300 Systems in 20 Countries and a 45% Increase in Per-System Catheter Utilization. Total OCT Image Procedures Performed Surpass 10,000 Westford, MA, January 5, 2009 -- LightLab Imaging Inc. today announced several important developments in the field this past year that
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    19. ‘OMICRON’ collaboration announces OCT images at 1 micron

      ‘OMICRON’ collaboration announces OCT images at 1 micron
      OMICRON, a UK government sponsored collaboration, led by UK optical imaging company Michelson Diagnostics (MDL), has produced its first Optical Coherence Tomography (OCT) images at the new wavelength of 1 micron, providing improved resolution and contrast. To date, most imaging of skin tissue has be
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    20. Michelson Diagnostics Announces New PS1301 Processing System

      Michelson Diagnostics Announces New PS1301 Processing System
      Michelson Diagnostics is pleased to announce the launch of its latest product, the PS1301 four-channel Optical Coherence Tomography (OCT) processing system. It is targeted at research customers who need to build their swept-source OCT experiments quickly, and do not want to use valuable project time
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    1969-1992 of 1999 « 1 2 ... 80 81 82 83 84 »
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