1. Adeel Ahmad

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    1. Mentioned In 18 Articles

    2. Intravascular magnetomotive optical coherence tomography of targeted early-stage atherosclerotic changes in ex vivo hyperlipidemic rabbit aortas

      Intravascular magnetomotive optical coherence tomography of targeted early-stage atherosclerotic changes in ex vivo hyperlipidemic rabbit aortas
      ...geted MSs. early-stage atherosclerotic changes in ex vivo hyperlipidemic rabbit aortas 1. Jongsik Kim^1^1, 2. Adeel Ahmad^2, 3. Joanne Li^3, 4. Marina Marjanovic^1,3, 5. Eric J. Chaney^1, 6. Kenneth S. Suslick^1,4 and 7....
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    3. Magnetomotive optical coherence elastography using magnetic particles to induce mechanical waves

      Magnetomotive optical coherence elastography using magnetic particles to induce mechanical waves
      Magnetic particles are versatile imaging agents that have found wide spread applicability in diagnostic, therapeutic, and rheology applications. In this study, we demonstrate that mechanical waves generated by a localized inclusion of magnetic nanoparticles can be used for assessment of the tissue viscoelastic properties using magnetomotive optical coherence elastography. We show these capabilities in tissue mimicking elastic and viscoelastic phantoms and in biological tissues by measuring the shear wave speed ...
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    4. Magnetomotive Optical Coherence Tomography for the Assessment of Atherosclerotic Lesions Using αvβ 3 Integrin-Targeted Microspheres

      Magnetomotive Optical Coherence Tomography for the Assessment of Atherosclerotic Lesions Using αvβ 3 Integrin-Targeted Microspheres
      Purpose We investigated the early-stage fatty streaks/plaques detection using magnetomotive optical coherence tomography (MM-OCT) in conjunction with v 3 integrin-targeted magnetic microspheres (MSs). The targeting of functionalized MSs was investigated by perfusing ex vivo aortas from an atherosclerotic rabbit model in a custom-designed flow chamber at physiologically relevant pulsatile flow rates and pressures. Procedures Aortas were extracted and placed in a flow chamber. Magnetic MS contrast agents were perfused ...
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    5. Feature Of The Week 5/12/13: University of Illinois at Urbana-Champaign Reports on Real-Time In Vivo Computed Optical Interferometric Tomography

      Feature Of The Week 5/12/13: University of Illinois at Urbana-Champaign Reports on Real-Time In Vivo Computed Optical Interferometric Tomography
      ...ions such as image-guided surgery. For more information see recent Article . Courtesy of Nathan Shemonski and Adeel Ahmad from University of Illinois at Urbana-Champaign . Real-time, high-resolution tomography over an ex...
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    6. Real-time in vivo computed optical interferometric tomography

      Real-time in vivo computed optical interferometric tomography
      High-resolution real-time tomography of scattering tissues is important for many areas of medicine and biology 1 , 2 , 3 , 4 , 5 , 6 . However, the compromise between transverse resolution and depth-of-field, in addition to low sensitivity deep in tissue, continues to impede progress towards cellular-level volumetric tomography. Computed imaging has the potential to solve these long-standing limitations. Interferometric synthetic aperture microscopy 7 , 8 , 9 is a computed imaging technique enabling high-resolution volumetric ...
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    7. Dual-coil magnetomotive optical coherence tomography for contrast enhancement in liquids

      Dual-coil magnetomotive optical coherence tomography for contrast enhancement in liquids
      Magnetomotive optical coherence tomography (MM-OCT) is a functional extension of OCT which utilizes magnetically responsive materials that are modulated by an external magnetic field for contrast enhancement and for elastography to assess the structural and viscoelastic properties of the surrounding tissues. Traditionally, magnetomotive contrast relies on the interaction between the displacement of magnetic particles induced by an external magnetic field and the micro-environmental restoring (elastic) force acting on the particles ...
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    8. Feature Of The Week 12/9/12: University of Illinois at Urbana Champaign Researchers Extend Astronomical Guide-Star Techniques to Computational OCT Imaging

      Feature Of The Week 12/9/12: University of Illinois at Urbana Champaign Researchers Extend Astronomical Guide-Star Techniques to Computational OCT Imaging
      Researchers at the University of Illinois at Urbana-Champaign have a long history of novel work in the field of OCT and related fields. This includes the very promising area of computational adaptive optics and related methods that offer the promise of dramatically improved images in a wide variety of settings by performing post-acquisition processing of magnitude and phase data. Below is a summary of some of their recent work. Aberrations ...
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    9. Guide-star-based computational adaptive optics for broadband interferometric tomography

      Guide-star-based computational adaptive optics for broadband interferometric tomography
      We present a method for the numerical correction of optical aberrations based on indirect sensing of the scattered wavefront from point-like scatterers (guide stars) within a three-dimensional broadband interferometric tomogram. This method enables the correction of high-order monochromatic and chromatic aberrations utilizing guide stars that are revealed after numerical compensation of defocus and low-order aberrations of the optical system. Guide-star-based aberration correction in a silicone phantom with sparse sub-resolution-sized scatterers ...
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    10. Feature Of The Week 6/10/12: Computational Adaptive Optics: A New Digital Post-Processing Technique to Optimize Resolution in OCT and other Interferometric Optical Imaging Applications

      Feature Of The Week 6/10/12: Computational Adaptive Optics: A New Digital Post-Processing Technique to Optimize Resolution in OCT and other Interferometric Optical Imaging Applications
      OCT and other interferometric optical 2D and 3D imaging techniques have long been plagued by the fundamental optical limitations such as that which occurs between depth-of-field (Rayleigh range) and lateral resolution or limitations in image resolution due to optical aberrations (spatial and spectral) that occur within delivery or collection optics or within tissue themselves.  Over the past few years there have been a variety of new powerful post optical detection ...
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    11. Computational adaptive optics for broadband optical interferometric tomography of biological tissue

      Computational adaptive optics for broadband optical interferometric tomography of biological tissue
      Aberrations in optical microscopy reduce image resolution and contrast, and can limit imaging depth when focusing into biological samples. Static correction of aberrations may be achieved through appropriate lens design, but this approach does not offer the flexibility of simultaneously correcting aberrations for all imaging depths, nor the adaptability to correct for sample-specific aberrations for high-quality tomographic optical imaging. Incorporation of adaptive optics (AO) methods have demonstrated considerable improvement in ...
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    12. The impact of aberrations on object reconstruction with interferometric synthetic aperture microscopy

      The impact of aberrations on object reconstruction with interferometric synthetic aperture microscopy
      ...orrect the effects of aberrations, i.e. to perform virtual adaptive optics. Steven G. Adie, Benedikt W. Graf, Adeel Ahmad, Budiman Darbarsyah, Stephen A. Boppart and P. Scott Carney, "The impact of aberrations on object ...
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    13. 1-15 of 18 1 2 »
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  2. About Adeel Ahmad

    Adeel Ahmad

    Adeel Ahmad is a graduate student pursuing a PhD in the Department of Electrical and Computer Engineering at the University of Illinois at Urbana Champaign, USA. He received his bachelor’s degree in Electrical engineering from National University of science and technology, Pakistan in 2006 and his Master’s degree in Electrical and Computer engineering from the University of Illinois at Urbana Champaign in 2010. His current research interests lie in developing computational techniques for optical coherence tomography and in the application of magnetic particles for optical imaging.