1. University of Auckland

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    1. Mentioned In 50 Articles

    2. Use of optical coherence tomography and light microscopy for characterisation of mechanical properties and cellular level responses of ‘Centurion’ blueberries during weight loss

      Use of optical coherence tomography and light microscopy for characterisation of mechanical properties and cellular level responses of ‘Centurion’ blueberries during weight loss
      Postharvest blueberry softening hinders consumer acceptance and correlates with high moisture loss during storage. Such textural variations have been attributed to factors such as turgor, cell wall modifications and other microstructural changes in the outer cell layers of the fruit. This paper investigates the impact of moisture loss on blueberry quality, as well as the structure and/or function relationships associated with fruit mechanical properties during postharvest using an integrated ...
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    3. Impact-induced cartilage damage assessed using polarisation-sensitive optical coherence tomography

      Impact-induced cartilage damage assessed using polarisation-sensitive optical coherence tomography
      Non-invasive determination of structural changes in articular cartilage immediately after impact and rehydration provides insight into the response and recovery of the soft tissue, as well as provides a potential methodology for clinicians to quantify early degenerative changes. In this study, we use polarisation-sensitive optical coherence tomography (PS-OCT) to examine subtle alterations of the optical properties in healthy and early-stage degenerate articular cartilage immediately after impact loading to identify structurally ...
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    4. Towards real time assessment of intramuscular fat content in meat using optical fiber-based optical coherence tomography

      Towards real time assessment of intramuscular fat content in meat using optical fiber-based optical coherence tomography
      We consider the use of optical coherence tomography (OCT) imaging to predict the quality of meat. We find that intramuscular fat (IMF) absorbs infrared light about nine times stronger than muscle, which enables us to estimate fat content in intact meat samples. The method is made very efficient by extracting relevant information from the three-dimensional high-resolution images generated by OCT using principal component analysis (PCA). The principal components are then ...
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    5. Inverse spectroscopic optical coherence tomography (ISOCT) for characterization of particle size and concentration

      Inverse spectroscopic optical coherence tomography (ISOCT) for characterization of particle size and concentration
      Inverse spectroscopic optical coherence tomography (IS-OCT) methods apply inverse problem formulations to acquired spectra to estimate depth-resolved sample properties. In the current study, we modelled the time-frequency-distributions using Lambert-Beer law and implemented IS-OCT using backscattering spectra calculated from Mie theory, then demonstrated the algorithm on polystyrene microspheres under idealized conditions. The results are significant because the method is compatible with high concentrations and broad diameter distributions of scattering particles such ...
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    6. Fourier domain quantum optical coherence tomography

      Fourier domain quantum optical coherence tomography
      Quantum optical coherence tomography (Q-OCT) is the non-classical counterpart of optical coherence tomography (OCT), a high-resolution 3D imaging technique based on white-light interferometry. Because Q-OCT uses a source of frequency-entangled photon pairs, not only is the axial resolution not affected by dispersion mismatch in the interferometer but is also inherently improved by a factor of two. Unfortunately, practical applications of Q-OCT are hindered by image-scrambling artefacts and slow acquisition times ...
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    7. Phenotype- and patient-specific modelling in asthma: bronchial thermoplasty and uncertainty quantification

      Phenotype- and patient-specific modelling in asthma: bronchial thermoplasty and uncertainty quantification
      Theoretical models can help to overcome experimental limitations to better our understanding of lung physiology and disease. While such efforts often begin in broad terms by determining the effect of a disease process on a relevant biological output, more narrowly defined simulations may inform clinical practice. Two such examples are phenotype-specific and patient-specific models, the former being specific to a group of patients with common characteristics, and the latter to ...
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    8. Quantum Optical Coherence Tomography using two photon joint spectrum detection (JS-Q-OCT)

      Quantum Optical Coherence Tomography using two photon joint spectrum detection (JS-Q-OCT)
      Quantum Optical Coherence Tomography (Q-OCT) is the non-classical counterpart of Optical Coherence Tomography (OCT) - a high-resolution 3D imaging technique based on white-light interferometry. Because Q-OCT uses a source of frequency-entangled photon pairs, not only is the axial resolution not affected by dispersion mismatch in the interferometer, but is also inherently improved by a factor of square root of two. Unfortunately, practical applications of QOCT are hindered by image-scrambling artefacts and ...
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    9. Optical coherence tomography imaging of evoked neural activity in sciatic nerve of rat

      Optical coherence tomography imaging of evoked neural activity in sciatic nerve of rat
      Significance: Imaging neural activity in myelinated tissue using optical coherence tomography (OCT) creates exciting possibilities for functional imaging in the peripheral and central nervous systems. Aim: To investigate changes in OCT images in response to evoked neural activity in sciatic nerve of rat in vitro. Approach: M-scans were obtained on peripheral nerves of rat using a swept source polarisation sensitive OCT system, while a nerve cuff acquired electrical neural recordings ...
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    10. Quantum-inspired detection for Spectral Domain Optical Coherence Tomography

      Quantum-inspired detection for Spectral Domain Optical Coherence Tomography
      The intensity levels allowed by safety standards (ANSI or ICNIRP) limit the amount of light that can be used in a clinical setting to image highly scattering or absorptive tissues with Optical Coherence Tomography (OCT). To achieve high-sensitivity imaging at low intensity levels, we adapt a detection scheme - which is used in quantum optics for providing information about spectral correlations of photons - into a standard spectral domain OCT system. This ...
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    11. Optical coherence tomography complements confocal microscopy for investigation of multicellular tumour spheroids

      Optical coherence tomography complements confocal microscopy for investigation of multicellular tumour spheroids
      Knowledge of optical properties, such as the refractive index (RI), of biological tissues is important in optical imaging, as they influence the distribution and propagation of light in tissue. To accurately study the response of cancerous cells to drugs, optimised imaging protocols are required. This study uses a simple custom-built spectral domain optical coherence tomography (OCT) system to conduct RI measurements of multicellular spheroids, three-dimensional (3D) in-vitro culture systems, of ...
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    12. Refractive index measurements of multicellular tumour spheroids using optical coherence tomography: dependence on growth phase and size

      Refractive index measurements of multicellular tumour spheroids using optical coherence tomography: dependence on growth phase and size
      Knowledge of optical properties, such as the refractive index (RI), of biological tissues is important in optical imaging, as they influence the distribution and propagation of light in tissue. To accurately study the response of cancerous cells to drugs, optimised imaging protocols are required. This study uses a simple custom-built spectral domain optical coherence tomography (OCT) system to conduct RI measurements of multicellular spheroids, three-dimensional in-vitro culture systems, of the ...
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    13. Effect of phacoemulsification incision size on incision repair and remodeling: Optical coherence tomography assessment

      Effect of phacoemulsification incision size on incision repair and remodeling: Optical coherence tomography assessment
      Purpose To characterize the effect of incision size on corneal incision repair and remodeling over 3 months after cataract surgery. Setting Department of Ophthalmology, Auckland District Health Board, Auckland, New Zealand. Design Prospective case series. Methods Eyes having routine cataract surgery were randomized to receive 2.20 mm or 2.85 mm uniplanar clear corneal incisions. Anterior segment optical coherence tomography of incision thickness, length, width, gaping, and angle and ...
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    14. Quantifying birefringence in the bovine model of early osteoarthritis using polarisation-sensitive optical coherence tomography and mechanical indentation

      Quantifying birefringence in the bovine model of early osteoarthritis using polarisation-sensitive optical coherence tomography and mechanical indentation
      Recent studies have shown potential for using polarisation sensitive optical coherence tomography (PS-OCT) to study cartilage morphology, and to be potentially used as an in vivo , non-invasive tool for detecting osteoarthritic changes. However, there has been relatively limited ability of this method to quantify the subtle changes that occur in the early stages of cartilage degeneration. An established mechanical indenting technique that has previously been used to examine the microstructural ...
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  2. About University of Auckland

    University of Auckland

    University of Auckland is New Zealand's largest university and the top-ranked New Zealand university. Established in 1883 as a constituent college of the University of New Zealand, the university is now made up of eight faculties over six campuses, and has more than 39,000 students at April 2006.   Also see the Department of Physics at the University of Auckland.