Yongyi Zhao's research while affiliated with Rice University and other places
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Publications (9)
Significance:
Imaging through scattering media is critical in many biomedical imaging applications, such as breast tumor detection and functional neuroimaging. Time-of-flight diffuse optical tomography (ToF-DOT) is one of the most promising methods for high-resolution imaging through scattering media. ToF-DOT and many traditional DOT methods requi...
Reconstructing an object’s geometry and appearance from multiple images, also known as inverse rendering, is a fundamental problem in computer graphics and vision. Inverse rendering is inherently ill-posed because the captured image is an intricate function of unknown lighting, material properties and scene geometry. Recent progress in representing...
Reconstructing an object's geometry and appearance from multiple images, also known as inverse rendering, is a fundamental problem in computer graphics and vision. Inverse rendering is inherently ill-posed because the captured image is an intricate function of unknown lighting conditions, material properties and scene geometry. Recent progress in r...
Using visible/NIR light has recently gained popularity within biomedical imaging due to its safety and flexibility in implementation. Safe, reliable methods for measuring physiological parameters like perfusion, heart rate, and vascularization is crucial for monitoring severe disease pathologies. Here we discuss recent progress in optical imaging a...
We introduce a novel image reconstruction method for time-resolved diffuse optical tomography (DOT) that yields submillimeter resolution in less than a second. This opens the door to high-resolution real-time DOT in imaging of the brain activity. We call this approach the sensitivity equation based noniterative sparse optical reconstruction (SENSOR...
Light scattering by tissue severely limits how deep beneath the surface one can image, and the spatial resolution one can obtain from these images. Diffuse optical tomography (DOT) is one of the most powerful techniques for imaging deep within tissue – well beyond the conventional
$\sim$
10-15 mean scattering lengths tolerated by ballistic imagin...
Light scattering by tissue severely limits both how deep beneath the surface one can image, and at what spatial resolution one can obtain from these images. Diffuse optical tomography (DOT) has emerged as one of the most powerful techniques for imaging deep within tissue -- well beyond the conventional $\sim$ 10-15 mean scattering lengths tolerated...
A webcam can read a pulse nearly as well as a finger pulse sensor. Real-time remote photoplethysmography using a webcam and graphical user interface.
Citations
... 7 Accurate forward models and inverse solvers were essential in several recent papers that achieved high resolution reconstructions through densely scattering media. 5,[8][9][10][11] Despite the recent progress in optimizing the DOT inverse solver, it still possesses several limitations. First, inverse solvers can be slow. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/279051274080306-1443542417070_Q64/Hyun-Kim-19.jpg)
![[object Object]](https://i1.rgstatic.net/ii/profile.image/362745829576705-1463496753150_Q64/Ashok-Veeraraghavan.jpg)
... To establish this reconstruction algorithm, DOT uses the predictable relationship between spatial variations in the optical properties and the spatial-angular distribution of light, the radiance. 5,6 This relationship can be represented as a function known as the forward model, which maps the spatial distribution of optical properties to the radiance. To perform image reconstruction, this forward model must be inverted, establishing a mapping from the radiance to the spatial distribution of optical properties. ...
