1. Articles from Raphael André

    1-5 of 5
    1. Feature Of The Week 6/23/13: Ludwig Maximilian University of Munich Investigates Benefits of Joint Aperture Detection in Ophthalmic MHz OCT

      Feature Of The Week 6/23/13: Ludwig Maximilian University of Munich Investigates Benefits of Joint Aperture Detection in Ophthalmic MHz OCT

      Joint-aperture optical coherence tomography (JA-OCT) is an angle-resolved OCT method, in which illumination from an active channel is simultaneously probed by several passive channels. JA-OCT increases the collection efficiency and effective sensitivity of the OCT system without increasing the power on the sample. Additionally, JA-OCT provides angular scattering information about the sample in a single acquisition, so the OCT imaging speed is not reduced. Thus, JA-OCT is especially suitable for ultra high speed in-vivo imaging. JA-OCT is compared to other angle-resolved techniques, and the relation between joint aperture imaging, adaptive optics, coherent and incoherent compounding is discussed. We present angle-resolved ...

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    2. Joint aperture detection for speckle reduction and increased collection efficiency in ophthalmic MHz OCT

      Joint aperture detection for speckle reduction and increased collection efficiency in ophthalmic MHz OCT

      Joint-aperture optical coherence tomography (JA-OCT) is an angle-resolved OCT method, in which illumination from an active channel is simultaneously probed by several passive channels. JA-OCT increases the collection efficiency and effective sensitivity of the OCT system without increasing the power on the sample. Additionally, JA-OCT provides angular scattering information about the sample in a single acquisition, so the OCT imaging speed is not reduced. Thus, JA-OCT is especially suitable for ultra high speed in-vivo imaging. JA-OCT is compared to other angle-resolved techniques, and the relation between joint aperture imaging, adaptive optics, coherent and incoherent compounding is discussed. We present angle-resolved ...

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    3. Ultrahigh-speed non-invasive widefield angiography

      Ultrahigh-speed non-invasive widefield angiography

      tinal and choroidal vascular imaging is an important diagnostic benefit for ocular diseases such as age-related macular degeneration. The current gold standard for vessel visualization is fluorescence angiography. We present a potential non-invasive alternative to image blood vessels based on functional Fourier domain optical coherence tomography (OCT). For OCT to compete with the field of view and resolution of angiography while maintaining motion artifacts to a minimum, ultrahigh-speed imaging has to be introduced. We employ Fourier domain mode locking swept source technology that offers high quality imaging at an A-scan rate of up to 1.68 MHz. We present retinal ...

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    4. Multi-MHz FDML OCT: snapshot retinal imaging at 6.7 million axial-scans per second

      Multi-MHz FDML OCT: snapshot retinal imaging at 6.7 million axial-scans per second

      We demonstrate the acquisition of densely sampled wide-field 3D OCT datasets of the human retina in 0.3s. This performance is achieved with a multi-MHz Fourier domain mode-locked (FDML) laser source operating at 1050nm. A two-beam setup doubles the 3.35MHz laser sweep rate to 6.7MHz, which is 16x faster than results achieved with any non-FDML source used for retinal OCT. We discuss two main benefits of these high line rates: First, large datasets over an ultra-wide field of view can be acquired with a low probability of distortions. Second, even if eye movements occur, now the scan rate ...

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    5. Feature Of The Week 9/4/11: Researchers at Ludwig-Maximilians University Continue to Blaze Trails Developing High Performance Swept Source OCT Technology and Its Application in Medical Imaging

      Feature Of The Week 9/4/11: Researchers at Ludwig-Maximilians University Continue to Blaze Trails Developing High Performance Swept Source OCT Technology and Its Application in Medical Imaging
      Researchers at Ludwig-Maximilians University continue to blaze trails in their work developing high performance swept source optical coherence tomography technology and the application of high speed frequency tuned sources in medical imaging. The Fourier-domain mode locked laser (FDML) together with tapped-delay line sweep-rate multipliers, light delivery and calibration optics, novel frame averaging and sampling techniques, wide FOV scanning technology, and high speed signal processing and visualization technology are impressive and will clearly have a significant impact on future medical imaging systems and ultimately patient care. Below is a presentation on some of their work entitled “(Multi-) MHz FDML OCT: Retinal ...
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    1-5 of 5
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  2. Topics in the News

    1. (5 articles) Ludwig Maximilian University of Munich
    2. (5 articles) Robert A. Huber
    3. (5 articles) Wolfgang Wieser
    4. (4 articles) Thomas Klein
    5. (4 articles) Raphael André
    6. (2 articles) Tom Pfeiffer
    7. (2 articles) Anselm Kampik
    8. (2 articles) Christoph M. Eigenwillig
    9. (2 articles) Aljoscha S. Neubauer
    10. (1 articles) Benjamin R. Biedermann
    11. (1 articles) Medical University of Vienna
    12. (1 articles) Angelika Unterhuber
    13. (1 articles) Perimeter Medical Imaging
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    Feature Of The Week 9/4/11: Researchers at Ludwig-Maximilians University Continue to Blaze Trails Developing High Performance Swept Source OCT Technology and Its Application in Medical Imaging Multi-MHz FDML OCT: snapshot retinal imaging at 6.7 million axial-scans per second Ultrahigh-speed non-invasive widefield angiography Joint aperture detection for speckle reduction and increased collection efficiency in ophthalmic MHz OCT Feature Of The Week 6/23/13: Ludwig Maximilian University of Munich Investigates Benefits of Joint Aperture Detection in Ophthalmic MHz OCT Diagnostic Performance of Deep Learning for Angle Closre Wide-field Optical Coherence Tomography Imaging of Excised Breast Tissue. PhD, Doctoral Student Opening in Multimodal Optical Imaging at the Medical University of Vienna Progression in Glaucoma (Thesis) Curved-Full-Field OCT for high-resolution imaging of living human retina over a large field-of-view Perioperative intraretinal fluid observed using optical coherence tomography in the epiretinal membrane Functional and Structural Reliability of Optic Nerve Head Measurements in Healthy Eyes by Means of Optical Coherence Tomography Angiography