1. Xuan Liu

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    1. Mentioned In 41 Articles

    2. Optically computed optical coherence tomography for volumetric imaging

      Optically computed optical coherence tomography for volumetric imaging
      We describe an innovative optically computed optical coherence tomography (OC-OCT) technology. The OC-OCT system performs depth resolved imaging by computing the Fourier transform of the interferometric spectra optically. The OC-OCT system modulates the interferometric spectra with Fourier basis function projected to a spatial light modulator and detects the modulated signal without spectral discrimination. The novel, to the best of our knowledge, optical computation strategy enables volumetric OCT imaging without performing ...
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      Mentions: Xuan Liu
    3. Assessment and removal of additive noise in a complex optical coherence tomography signal based on Doppler variation analysis

      Assessment and removal of additive noise in a complex optical coherence tomography signal based on Doppler variation analysis
      In this study, we investigate and validate a novel approach to assess and remove additive noise for optical coherence tomography (OCT) imaging. Our method first generates a map of additive noise for the OCT image through Doppler variation analysis. We then remove the additive noise from the real and imaginary parts of the complex OCT signal through pixelwise Wiener filtering. Our results show that the method described in this manuscript ...
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      Mentions: Xuan Liu
    4. Noise adaptive wavelet thresholding for speckle noise removal in optical coherence tomography

      Noise adaptive wavelet thresholding for speckle noise removal in optical coherence tomography
      Optical coherence tomography (OCT) is based on coherence detection of interferometric signals and hence inevitably suffers from speckle noise. To remove speckle noise in OCT images, wavelet domain thresholding has demonstrated significant advantages in suppressing noise magnitude while preserving image sharpness. However, speckle noise in OCT images has different characteristics in different spatial scales, which has not been considered in previous applications of wavelet domain thresholding. In this study, we ...
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    5. Optical coherence tomography for non-invasive examination and conservation of cultural heritage objects

      Optical coherence tomography for non-invasive examination and conservation of cultural heritage objects
      Optical coherence tomography (OCT) has great potential for the examination of oil paintings, particularly for celebrated masterpieces by great artists in history. We developed an OCT system for large field of view (FOV), high definition (HD) imaging of oil paintings. To achieve large FOV, we translated the sample using a pair of high-precision linear motors and performed sequential volumetric imaging on adjacent, non-overlapping regions. Through 3D OCT imaging, the surface ...
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    6. High-definition optical coherence tomography imaging for noninvasive examination of heritage works

      High-definition optical coherence tomography imaging for noninvasive examination of heritage works
      Cultural heritage works, such as ancient murals and historical paintings, are examined routinely for the purpose of conservation. Previous works have applied optical coherence tomography (OCT), which is a three-dimensional (3D) microscopic imaging modality in the field of heritage works conservation. The data acquired by OCT provides both 3D surface information of the object and structure information underneath the surface. Therefore, cross-sectional information on the object can be utilized to ...
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    7. Optical coherence tomography systems and methods with magnitude and direction tracking of transverse motion

      Optical coherence tomography systems and methods with magnitude and direction tracking of transverse motion
      An optical coherence tomography (OCT) system having magnitude and direction of motion detection has a light source, and a scanning system arranged in an optical path of the light source. The scanning system is configured to scan an illumination beam of light in a spatial pattern around each of a plurality of points of interest of an object under observation for a corresponding plurality of instants of time in which ...
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    8. Quantitative optical coherence elastography based on fiber-optic probe for in situ measurement of tissue mechanical properties

      Quantitative optical coherence elastography based on fiber-optic probe for in situ measurement of tissue mechanical properties
      We developed a miniature quantitative optical coherence elastography (qOCE) instrument with an integrated Fabry-Perot force sensor, forin situelasticity measurement of biological tissue. The technique has great potential for biomechanics modeling and clinical diagnosis. We designed the fiber-optic qOCE probe that was used to exert a compressive force to deform tissue at the tip of the probe. Using the space-division multiplexed optical coherence tomography (OCT) signal detected by a spectral domain ...
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      Mentions: Xuan Liu
    9. Lateral distortion corrected optical coherence tomography system

      Lateral distortion corrected optical coherence tomography system
      A lateral-distortion corrected optical coherence tomography system. The system can include an optical coherence tomography sensor, a light source, a fiber-optic system arranged to provide a reference beam and an observation beam, an optical detection system arranged to receive combined light from the reference beam and the observation beam and to provide detection signals, and a data processing system arranged to communicate with the optical detection system and receive the ...
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    10. Interferometric force sensor for surgical instruments

      Interferometric force sensor for surgical instruments
      A surgical tool system according to an embodiment of the current invention includes a surgical tool, and an interferometry system optically coupled to the surgical tool. The surgical tool includes a body section, a sensor section at least one of attached to or integral with the body section, and a surgical section at least one of attached to or integral with the sensor section at an opposing end of the ...
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    11. Distortion corrected optical coherence tomography system

      Distortion corrected optical coherence tomography system
      An axial motion distortion-corrected optical coherence tomography system. The system can include an optical coherence tomography sensor, a light source, a fiber-optic system arranged to provide a reference beam and an observation beam, an optical detection system arranged to receive combined light from the reference beam and the observation beam and to provide detection signals, and a data processing system arranged to receive said detection signals, construct a plurality of ...
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    12. Robust motion tracking based on adaptive speckle decorrelation analysis of OCT signal

      Robust motion tracking based on adaptive speckle decorrelation analysis of OCT signal
      Speckle decorrelation analysis of optical coherence tomography (OCT) signal has been used in motion tracking. In our previous study, we demonstrated that cross-correlation coefficient (XCC) between Ascans had an explicit functional dependency on the magnitude of lateral displacement ( x ). In this study, we evaluated the sensitivity of speckle motion tracking using the derivative of function XCC( x ) on variable x . We demonstrated the magnitude of the derivative can be maximized ...
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      Mentions: Xuan Liu
    13. Durable single mode fiber probe with optimized reference reflectivity

      Durable single mode fiber probe with optimized reference reflectivity
      A probe for a common path optical coherence tomography system includes a sheath having a proximal end and a distal end and defining a lumen therein, a single mode optical fiber disposed within the lumen of the sheath such that a portion of the single mode optical fiber extends beyond the distal end of the sheath. The single mode optical fiber has an end face for transmitting and receiving light ...
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    14. System and method for assessing the flow of a fluid

      System and method for assessing the flow of a fluid
      A system for assessing the flow of a fluid. The system can include a light source, a fiber-optic system optically coupled to the light source, which is arranged to provide a reference beam and an observation beam, an optical detection system arranged to receive combined light from the reference beam and the observation beam and to provide detection signals, and a data processing system arranged to communicate with the optical ...
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    15. Distortion Corrected Optical Coherence Tomography System

      Distortion Corrected Optical Coherence Tomography System
      An axial motion distortion-corrected optical coherence tomography system. The system can include an optical coherence tomography sensor, a light source, a fiber-optic system arranged to provide a reference beam and an observation beam, an optical detection system arranged to receive combined light from the reference beam and the observation beam and to provide detection signals, and a data processing system arranged to receive said detection signals, construct a plurality of ...
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    16. 1-15 of 41 1 2 3 »
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  2. About Xuan Liu

    Xuan Liu

    Xuan Liu  received the B.S. degree in Electronics Engineering and M.S. degree in Physics in 2005 and 2007, respectively, from Tsinghua University, Beijing, China;  since 2007 has been working toward the PhD degree in Electrical and Computer Engineering in the Johns Hopkins University, Baltimore, MD. Her research interest is biomedical microscopic imaging, especially optical coherence tomography.