1. Jigang Wu

    0 Comments Leave a Comment

    1-16 of 16
    1. Mentioned In 16 Articles

    2. Three-dimensional endoscopic OCT using sparse sampling with a miniature magnetic-driven scanning probe

      Three-dimensional endoscopic OCT using sparse sampling with a miniature magnetic-driven scanning probe
      We propose to apply sparse sampling and compressive sensing (CS) reconstruction in three-dimensional (3D) endoscopic optical coherence tomography (OCT) to reduce the amount of data required in the imaging process. We used a homemade miniature side-imaging magnetic-driven scanning probe with an outer diameter of 1.4 mm in a 1310 nm swept-source OCT system to acquire two-dimensional (2D) circumferential cross-sectional images of an ex vivo pigeon trachea sample. 3D imaging ...
      Read Full Article
    3. A 2.8-mm-diameter scanhead for multispectral photoacoustic microscopy and optical coherence tomography

      A 2.8-mm-diameter scanhead for multispectral photoacoustic microscopy and optical coherence tomography
      An endoscopic probe with high resolution and multiple contrasts provides useful diagnostic information. For example, a miniature probe capable of multimodal imaging including photoacoustic imaging, optical coherence tomography (OCT), and ultrasound has been reported. However, microscale resolution is only realized in OCT modality in the probe, which may restrict the applications where high resolutions for multiple contrasts are required. Here, we present an approach to construct a miniature scanhead with ...
      Read Full Article
    4. Endoscopic optical coherence tomography using compressive sensing

      Endoscopic optical coherence tomography using compressive sensing
      Conventionally endoscopic OCT images are reconstructed by uniform sampling in both axial and transverse direction of the image. To shorten the scanning time and reduce the acquisition data, we propose to sparsely sample the axial scans and use compressive sensing (CS) to reconstruct the full endoscopic OCT image with randomly chosen axial scans that are much less than conventional Nyquist criteria requirement. And we study the ratio of sparse sampling ...
      Read Full Article
    5. Miniaturized magnetic-driven scanning probe for endoscopic optical coherence tomography

      Miniaturized magnetic-driven scanning probe for endoscopic optical coherence tomography
      We designed and implemented a magnetic-driven scanning (MDS) probe for endoscopic optical coherence tomography (OCT). The probe uses an externally-driven tiny magnet in the distal end to achieve unobstructed 360-degree circumferential scanning at the side of the probe. The design simplifies the scanning part inside the probe and thus allows for easy miniaturization and cost reduction. We made a prototype probe with an outer diameter of 1.4 mm and ...
      Read Full Article
    6. Optical imaging techniques in microfluidics and their applications

      Optical imaging techniques in microfluidics and their applications
      Microfluidic devices have undergone rapid development in recent years and provide a lab-on-a-chip solution for many biomedical and chemical applications. Optical imaging techniques are essential in microfluidics for observing and extracting information from biological or chemical samples. Traditionally, imaging in microfluidics is achieved by bench-top conventional microscopes or other bulky imaging systems. More recently, many novel compact microscopic techniques have been developed to provide a low-cost and portable solution. In ...
      Read Full Article
    7. Congratulations to Jian Ren from Caltech a Winner of a 2012 Student Travel Grant Award

      Congratulations to Jian Ren from  Caltech a Winner of a 2012 Student Travel Grant Award
      Jian Ren from the California Institute of Technology is one of four winners of the OCT News 2012 student travel grant awards (see prior announcement Here). Below is a summary of his work. Glaucoma is one type of ophthalmic diseases, where ocular hypertension damages optical nerve, making it the second leading cause of blindness worldwide. One major cause of Open Angle Glaucoma is the poor outflow of aqueous humor through ...
      Read Full Article
    8. Feature Of The Week 5/1/11: Caltech Researchers Develop an OCT Needle Probe for Investigating Open Angle Glaucoma

      Feature Of The Week 5/1/11: Caltech Researchers Develop an OCT Needle Probe for Investigating Open Angle Glaucoma
      Feature Of The Week 5/1/11: One major cause of Open Angle Glaucoma is the poor outflow of aqueous humor through the Trabecular Meshwork (TM). Potential treatments include the micro-bypass stents, which are implanted in the TM and shunt fluid directly to the Schlemm’s Canal (SC) to reduce intraocular pressure. Implanting the stent with the appropriate orientation near a major collector channel (CC) might maximize outflow of aqueous ...
      Read Full Article
    9. Feature Of The Week 2/7/10: Manual-Scanning Optical Coherence Tomography (OCT) Probe Based on Position Tracking

      Feature Of The Week 2/7/10: Manual-Scanning Optical Coherence Tomography (OCT) Probe Based on Position Tracking
      Feature Of The Week 2/7/10: Optical Coherence Tomography (OCT) is now an important modality in the field of biomedical imaging for its high resolution and non-invasive nature. People have been developing OCT endoscopes to penetrate into deep biological tissues and extend the limited light penetration depth in near infrared wavelength region. Different ways of steering the probing beam have been developed over the years. As most of them ...
      Read Full Article
    10. Harmonically matched diffraction grating pair

      A method and device realize shallow gratings-based planar beam splitter/combiner. Non-trivial phase shifts between different ports of resulting interferometers are used to acquire full-field phase measurements. The non-trivial phase shifts between different ports of the planar beam splitter/combiner can be adjusted by simply shearing one grating with respect to the second grating. The two shallow diffraction gratings are harmonically-related and can be recorded on a single substrate for ...
      Read Full Article
    11. Coherence domain optical imaging techniques (Thesis)

      Coherence domain optical imaging techniques (Thesis)
      Coherence domain optical imaging techniques have been developing quickly in the past few decades after the invention of laser. In this thesis, I will report the imaging methods that constitute my research projects during these years of graduate studies, including paired-angle-rotation scanning (PARS) forward-imaging probe for optical coherence tomography (OCT), full-field phase imaging technique based on harmonically matched diffraction grating (G1G2 grating), and Fresnel zone plate (FZP) based optifluidic microscopy ...
      Read Full Article
    12. Paired angled rotation scanning probes and methods of use

      Probes, and systems and methods for optically scanning a conical volume in front of a probe, for use with an imaging modality, such as Optical Coherence Tomography (OCT). A probe includes an optical fiber having a proximal end and a distal end and defining an axis, with the proximal end of the optical fiber being proximate a light source, and the distal end having a first angled surface. A refractive ...
      Read Full Article
    13. Handheld forward-imaging needle endoscope for ophthalmic optical coherence tomography inspection

      ...ing needle endoscope for ophthalmic optical coherence tomography inspection Shuo Han,^1 Marinko V. Sarunic,^3 Jigang Wu,^1 Mark Humayun,^4 and Changhuei Yang^1,2 ^1California Institute of Technology, Department of Electr...
      Read Full Article
    14. 1-16 of 16
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. About Jigang Wu

    Jigang Wu

    Jigang Wu is an Postdoc in the Department of Electrical Engineering and Bioengineering at the California Institute of Technology.

  3. Quotes

    1. Our tests verified that a greatly reduced amount of experimental data can be used to reconstruct reasonable 3-D OCT images...After we perform enough experiments to demonstrate that our probe and imaging method are useful for observing malignant features, our technique will be ready for clinical trials...This work is just one example of applying computational techniques to imaging applications...We expect that similar approaches may be helpful for improving the experiment designs and data acquisition for many imaging modalities.
      In Faster 3-D imaging could aid diagnosis of cardiovascular, gastrointestinal disease