Proceedings IEEE International Symposium on Biomedical Imaging
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3D atlases - bridges between neurogenomics and neuroanatomy
- Trang 357-360
Neuroscience research in the post-genomic era requires rapid screening and
analysis of large tissue expanse. It demands close integration of information
derived from histological procedures and genomic data. This is impeded by the
absence of technology to automatically extract histological information and to
link it to genomic data. We are developing the necessary tools. At the core of
these are a...
#Bridges #Bioinformatics #Genomics #Anatomy #Neuroscience #Data mining #Spatial resolution #Impedance #Data visualization #Research and development
A level set method for Bayesian tomographic reconstruction
- Trang 665-668
We present a level-set method for Bayesian tomographic reconstruction. A novel
image prior is derived from the mean curvature evolution of level sets of an
image. As it has been studied in image processing with nonlinear diffusion, this
prior encourages the stabilization of an edge while the reconstructed image is
smoothed along both sides of the edge. An algorithm of iterated coordinate
decent wa...
#Level set #Bayesian methods #Tomography #Image reconstruction #Kinetic energy #Image processing #Optimization methods #Image restoration #Mathematics #Computer science
O(N/sup 2/ log N) native fan-beam tomographic reconstruction
- Trang 824-827
We present a new fast backprojection algorithm for CT fan-beam reconstruction.
The new algorithm operates directly on fan-beam data without prior rebinning to
parallel-beam projections. The algorithm reduces the computational complexity
from O(N/sup 3/) for the traditional fan-beam algorithm to O(N/sup 2/ log N).
Simulations demonstrate speedups of greater than 50-fold for a 512 /spl times/
512 im...
#Image reconstruction #Geometry #Computed tomography #Degradation #Filtering #Computational efficiency #Interpolation #Image quality #Computational complexity #Computational modeling
Development of hybrid NIR/MRI imaging system algorithm: use of a-priori information for tumor detection in the female breast
- Trang 657-660
The use of dual modality MRI and near infrared (NIR) optical tomography is under
investigation. It will be shown in this work that accurate structural a-priori
knowledge from the MRI image, together with appropriate constraints on the image
reconstruction can yield useful and accurate images of internal optical property
distributions and that this should help in identifying anomalies within the
br...
#Magnetic resonance imaging #Neoplasms #Optical scattering #Breast #Biomedical optical imaging #Optical modulation #Tomography #Optical imaging #Infrared detectors #Image reconstruction
Real-time processing of spectroscopic optical coherence tomography
- Trang 617-620
Spectroscopic OCT improves upon the conventional OCT system by processing the
entire detected interference signal and extracting spectral information. We
implement it as a real-time process using FPGA/DSP based processing hardware. We
propose an algorithm based on the Morlet wavelet transform that can be
approximated using our existing OCT system and hardware. The spectral
information that can be ...
#Spectroscopy #Tomography #Optical scattering #Hardware #Biomedical optical imaging #Coherence #Interference #Signal processing #Signal detection #Data mining
In vivo real-time freehand elasticity imaging
- Trang 805-808
We are developing a system for real-time estimation and display of tissue
elastic properties using a clinical ultrasonic imaging system. Results in
phantoms are in excellent agreement with that predicted with finite element
analysis. Results in volunteer patients have shown that high quality elasticity
images are easily obtained in vivo in breast and thyroid pathologies. The key
element to success...
#In vivo #Elasticity #Lesions #Ultrasonic imaging #Capacitive sensors #Real time systems #Displays #Imaging phantoms #Finite element methods #Breast
A new approach to reconstructing images in fan-beam computed tomography
- Trang 832-835
The hybrid algorithm developed previously for image reconstruction in fan-beam
computed tomography (CT) can have more desirable noise properties and
computational efficiency in comparison with the fan-beam filtered backprojection
(FFBP) algorithm. However, the one-dimensional (1D) explicit interpolation along
the radial direction involved in the previous hybrid algorithm can lead to a
reduced reso...
#Image reconstruction #Computed tomography #Image resolution #Interpolation #Filtration #Computer simulation #Image converters #Radiology #Oncology #Laboratories
Scanning mirror for optical coherence tomography using an electrostatic MEMS actuator
- Trang 297-300
Describes the development of a new type of optical coherence tomography (OCT)
probe using an electrostatic micromachine (MEMS) actuator. These devices consist
of millimeter scale mirrors resting on micron scale polyimide hinges that are
tilted using a linear MEMS actuator, the integrated force array (IFA). The IFA
is a parallel network of deformable capacitor cells that electrostatically
contract ...
#Mirrors #Tomography #Micromechanical devices #Electrostatic actuators #Polyimides #Fasteners #Voltage #Probes #Millimeter wave devices #Hydraulic actuators
Impact of axial collimation on hybrid PET image quality
- Trang 549-552
Previous studies have suggested that novel axial collimator designs may be able
to increase coincidence efficiency, and better shield out-of-FOV singles
photons. It was found that increasing the air gap between the septa and using
converging septa increased the sensitivity to the central FOV and improved the
shielding from out-of-FOV events. We are currently investigating image quality
of such col...
#Collimators #Positron emission tomography #Image quality #Cameras #Gamma ray detection #Gamma ray detectors #Face detection #Image converters #Image reconstruction #Event detection
A tool for breast MR images processing and classification
- Trang 181-184
One of the major problems for the women's quality of life in the industrialized
countries is the early diagnosis of breast cancer. Contrast-enhanced magnetic
resonance of the breast is the most attractive alternative to standard
mammography but the manual inspection of images is a long, subjective and
error-prone process. To face these problems, we propose a method whose steps
are: segmentation, c...
#Image processing #Breast cancer #Magnetic resonance #Mammography #Inspection #Image segmentation #Background noise #Data mining #Medical tests #Biomedical imaging