A5015593212- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Medical Imaging Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Crystallography and Radiation Phenomena
- Face recognition and analysis
- X-ray Diffraction in Crystallography
- Digital Holography and Microscopy
- Biometric Identification and Security
- Nuclear Physics and Applications
- Computer Graphics and Visualization Techniques
- Orthopedic Surgery and Rehabilitation
- Radiomics and Machine Learning in Medical Imaging
- Radiation Dose and Imaging
- Advanced Vision and Imaging
- Bone health and osteoporosis research
- Organ Transplantation Techniques and Outcomes
- Advanced MRI Techniques and Applications
- Advanced Semiconductor Detectors and Materials
- Infrared Thermography in Medicine
- Advancements in Photolithography Techniques
- Musculoskeletal synovial abnormalities and treatments
- Digital Radiography and Breast Imaging
- Face and Expression Recognition
Shenzhen University
2024-2025
Brookhaven National Laboratory
2008-2024
Fudan University
2023-2024
National Synchrotron Light Source II
1996-2024
Shenzhen Institute of Information Technology
2024
Guangxi Medical University
2024
Central South University
2022
Stony Brook University
2008-2011
University of North Carolina at Chapel Hill
1995-2011
Medical University of South Carolina
2011
Diffraction enhanced imaging is a new x-ray radiographic modality using monochromatic x-rays from synchrotron which produces images of thick absorbing objects that are almost completely free scatter. They show dramatically improved contrast over standard applied to the same phantom. The based not only on attenuation but also refraction and diffraction properties sample. This method may improve image quality for medical applications, industrial radiography non-destructive testing computed tomography.
Diffraction enhanced imaging (DEI) is a new, synchrotron-based, x-ray radiography method that uses monochromatic, fan-shaped beams, with an analyser crystal positioned between the subject and detector. The allows detection of only those x-rays transmitted by fall into acceptance angle (central part rocking curve) monochromator/analyser system. As shown Chapman et al , in addition to attenuation, provides information on out-of-plane angular deviation x-rays. New images result which image...
Seven breast cancer specimens were examined with diffraction-enhanced imaging at 18 keV a silicon crystal use of the 333 reflection in Bragg mode. Images compared digital radiographs specimen, and regions increased detail identified. Six seven cases (86%) showed enhanced visibility surface spiculation that correlated histopathologic information, including extension tumor into surrounding tissue.
We explored the potential for clinical research of computed tomography (CT) with monochromatic x-rays using preclinical multiple energy (MECT) system at National Synchrotron Light Source. MECT has a fixed, horizontal fan beam subject apparatus rotating about vertical axis; it will be used imaging human head and neck. Two -photodiode array detectors different spatial resolutions were used. A 10.5 cm diameter acrylic phantom was imaged 43 keV conventional CT (CCT) 80 kVp: resolution line pairs...
While MLLMs perform well on perceptual tasks, they lack precise multimodal alignment, limiting performance. To address this challenge, we propose Vision Dynamic Embedding-Guided Pretraining (VDEP), a hybrid autoregressive training paradigm for MLLMs. Utilizing dynamic embeddings from the MLP following visual encoder, approach supervises image hidden states and integrates tokens into training. Existing primarily focused recovering information textual inputs, often neglecting effective...
Synchrotron-based mammography imaging experiments have been performed with monochromatic x-rays in which a Laue crystal placed after the object being imaged has used to split beam transmitted through object. The X27C R&D beamline at National Synchrotron Light Source was white monochromatized by double Si(111) monochromator tuned 18 keV. thin horizontal line approximately 0.5 mm high 100 wide. Images were acquired scan mode phantom and detector both scanned together. for these an image...
PURPOSE: To explore the potential improvement in image contrast for breast imaging with use of monoenergetic photons. MATERIALS AND METHODS: The x-ray energy available from National Synchrotron Light Source is 5 to over 50 keV. A specific selected a tunable crystal monochromator. object scanned narrow beam 80.0 x 0.5 mm. Mammography phantoms were imaged plate and film as detectors. Phantom images obtained at 16-24 keV compared conventional mammographic unit. RESULTS: Preliminary findings...
Portrait Animation aims to synthesize a lifelike video from single source image, using it as an appearance reference, with motion (i.e., facial expressions and head pose) derived driving video, audio, text, or generation. Instead of following mainstream diffusion-based methods, we explore extend the potential implicit-keypoint-based framework, which effectively balances computational efficiency controllability. Building upon this, develop video-driven portrait animation framework named...
We have investigated the contrast mechanisms of refraction angle, and apparent absorption images obtained from diffraction enhanced imaging technique (DEI) correlated them with conventional radiography. The both DEI angle image radiograph same dependence on density differences tissues in visualization cancer; radiography these directly relate to while it is difference thickness gradient that gives angle. show fibrils breast cancer as measured by correlate well derived DEI. In addition we...
The ability of asymmetric Laue crystals to focus X-rays sagittally is demonstrated. extent such focusing similar that sagittal by a Bragg crystal, except for factor related the asymmetry angle. anticlastic bending facilitates use inverse-Cauchois geometry in meridional plane provide better energy resolution and increase photon flux an order magnitude compared with traditional crystals. Furthermore, at X-ray energies above 30 keV, crystal preferred because length beam's footprint on unlike...
We have developed a new X-ray imaging technique, diffraction enhanced (DEI), which can be used to independently visualize the refraction and absorption of an object. The images are almost completely scatter-free, allowing contrast objects that develop small angle scattering. combination these properties has resulted in mammography phantoms tissues dramatically improved over standard techniques. This technique potentially is applicable other fields medical radiology general, as well possible...
Diffraction-enhanced imaging (DEI) is a new x-ray modality that has been shown to enhance contrast between normal and cancerous breast tissues. In this study, diffraction-enhanced in computed tomography (DEI-CT) mode was used quantitatively characterize the refraction contrasts of organized structures associated with invasive human cancer. Using high-sensitivity Si (3 3 3) reflection, individual features cancer, including masses, calcifications spiculations, were observed. DEI-CT yields 14,...
The use of bent asymmetric Laue crystals to focus synchrotron X-rays sagittally from 15 50 keV is described. A four-bar bender, bending a rectangular planar crystal, produced the necessary sagittal and meridional for this unique application. Adjustments tilt angle height crystal resulted in first- second-order corrections, respectively, dependence diffraction on horizontal position crystal. After these remaining variation was order 10 µrad. theoretical focal length verified. prototype...
The use of bent asymmetric Laue crystals to sagittally focus high-energy synchrotron X-rays calls for an understanding the mechanisms affecting X-ray diffraction by such crystals. rocking-curve width, a measurable quantity directly related distortion lattice planes, is necessary first step towards understanding. A model formulated assessing widths crystals, considering elastic anisotropy. method depth-resolved measurement rocking curves was also developed verify model. successfully explains...
Gap regions between a bone and an implant, whether existing upon insertion or developing over time, can lead to implant failure. Currently, planar x-ray imaging CT are the most commonly used methods evaluate gap region. An alternative these available clinical modalities could help better resorption. Previous experiments with diffraction enhanced (DEI) have shown significant contrast advantages monochromatic synchrotron radiation (SR) imaging. DEI SR radiography images of samples drill holes...
The use of sagittally bent asymmetric Laue crystals in horizontally focusing monochromators for high-energy synchrotron X-rays necessitates simulation the X-ray reflectivity by such crystals. Based on theory lattice distortion diffraction plane crystals, a lamellar model was developed to predict their rocking curves. experimentally verified rocking-curve measurements from various reflections silicon four representative orientations, radii, using 67 keV energy.