1. Al-Hafeez Dhalla

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    1. Mentioned In 17 Articles

    2. How to Acquire High-Resolution Anatomic Ocular Tissue Information with Optical Coherence Tomography (OCT): Leica Science Lab

      How to Acquire High-Resolution Anatomic Ocular Tissue Information with Optical Coherence Tomography (OCT): Leica Science Lab
      OCT was first demonstrated in 1991 and was quickly recognized as an important tool in ophthalmology, rapidly becoming the standard of care in retinal diagnostics. Today, OCT is one of the most frequently ordered diagnostic tests. OCT technology is continually evolving, becoming increasingly popular in clinical and non-clinical imaging applications, including ophthalmic surgery, gastrointestinal imaging and interventional cardiology. OCT functions by a process very similar to ultrasound except, of course ...
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    3. Procedural optical coherence tomography (OCT) for surgery and related methods

      Procedural optical coherence tomography (OCT) for surgery and related methods
      Methods for performing a surgical procedure using optical coherence tomography (OCT) are provided. The method includes extracting lenticular material from within a capsular bag of an eye of a patient; acquiring at least one OCT image of an interior region of the capsular bag after extraction of substantially all of the lenticular material from within the capsular bag; determining from the at least one OCT image the presence of cellular ...
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    4. Image registration, averaging, and compounding for high speed extended depth optical coherence tomography

      Image registration, averaging, and compounding for high speed extended depth optical coherence tomography
      An optical coherence tomography (OCT) system including a source of broadband optical radiation and a beamsplitter coupled to the source is provided. The beamsplitter divides the source radiation into a reference path and a sample path. The reference path includes an optical switch to switch the reference path between a first path having a first reference reflector at a first reference optical path length and a second path having a ...
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    5. Systems and methods for complex conjugate artifact resolved optical coherence tomography

      Systems and methods for complex conjugate artifact resolved optical coherence tomography
      Systems and methods are disclosed for optical coherence tomography (OCT). For example, imaging can use optical phase modulators based on optical delay lines that, in conjunction with a swept-source laser, can be used to achieve heterodyne swept source optical coherence tomography (SSOCT). These techniques resolve the complex conjugate ambiguity in SSOCT, thereby doubling the usable imaging range. This increased imaging range has numerous important clinical applications in ophthalmology, cardiology and ...
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    6. Procedural Optical Coherence Tomography (OCT) For Surgery And Related Systems And Methods

      Procedural Optical Coherence Tomography (OCT) For Surgery And Related Systems And Methods
      Methods for performing a surgical procedure using optical coherence tomography (OCT) are provided. The method includes orienting the subject for the surgical procedure, wherein orienting comprises imaging a region of the subject that contains a structure having a known orientational asymmetry, testing the image for the presence and location of the structure, and confirming correct orientation of the subject using the OCT image of the structure having the known orientational ...
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    7. Blood flow velocity quantification using split-spectrum amplitude-decorrelation angiography with optical coherence tomography

      Blood flow velocity quantification using split-spectrum amplitude-decorrelation angiography with optical coherence tomography
      The split-spectrum amplitude-decorrelation angiography (SSADA) algorithm was recently developed as a method for imaging blood flow in the human retina without the use of phase information. In order to enable absolute blood velocity quantification, in vitro phantom experiments are performed to correlate the SSADA signal at multiple time scales with various preset velocities. A linear model relating SSADA measurements to absolute flow velocities is derived using the phantom data. The ...
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    8. Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch

      Efficient sweep buffering in swept source optical coherence tomography using a fast optical switch
      We describe a novel buffering technique for increasing the A-scan rate of swept source optical coherence tomography (SSOCT) systems employing low duty cycle swept source lasers. This technique differs from previously reported buffering techniques in that it employs a fast optical switch, capable of switching in 60 ns, instead of a fused fiber coupler at the end of the buffering stage, and is therefore appreciably more power efficient. The use ...
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    9. Development of Extended-Depth Swept Source Optical Coherence Tomography for Applications in Ophthalmic Imaging of the Anterior and Posterior Eye (Thesis)

      Development of Extended-Depth Swept Source Optical Coherence Tomography for Applications in Ophthalmic Imaging of the Anterior and Posterior Eye (Thesis)
      Optical coherence tomography (OCT) is a non-invasive optical imaging modality that provides micron-scale resolution of tissue micro-structure over depth ranges of several millimeters. This imaging technique has had a profound effect on the field of ophthalmology, wherein it has become the standard of care for the diagnosis of many retinal pathologies. Applications of OCT in the anterior eye, as well as for imaging of coronary arteries and the gastro-intestinal tract ...
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    10. Dual-depth SSOCT for simultaneous complex resolved anterior segment and conventional retinal imaging

      Dual-depth SSOCT for simultaneous complex resolved anterior segment and conventional retinal imaging
      We present a novel optical coherence tomography (OCT) system design that employs coherence revival-based heterodyning and polarization encoding to simultaneously image the ocular anterior segment and the retina. Coherence revival heterodyning allows for multiple depths within a sample to be simultaneously imaged and frequency encoded by carefully controlling the optical pathlength of each sample path. A polarization-encoded sample arm was used to direct orthogonal polarizations to the anterior segment and ...
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    11. 1-17 of 17
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  2. About Al-Hafeez Dhalla

    Al-Hafeez Dhalla

    Hafeez Dhalla is a postdoctoral research fellow at the Research Laboratory of Electronics at MIT, working in the Optics and Quantum Electronics and Laser Medicine and Medical Imaging groups under the guidance of Professor James Fujimoto. He also holds appointments at the New England Eye Center of Tufts Medical Center and the Casey Eye Institute of the Oregon Health & Science University . He received his Bachelor's of Science in Engineering in 2007, his Master's of Science in 2010, and his Ph.D. in 2012 - all in Biomedical Engineering at Duke University in the Fitzpatrick Institute for Photonics, under the guidance of Professor Joseph Izatt. He is interested in all forms of optical imaging, though to date his research has largely focused on microscopy and ophthalmic imaging, especially scanning laser ophthalmoscopy and optical coherence tomography.