Proceedings IEEE International Symposium on Biomedical Imaging
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Extended-FOV magnetic resonance imaging with table translation and frequency cycling
- Trang 955-958
A new method for MR imaging of an extended field-of-view (FOV) has been
developed and validated. The method employs concurrent MR data acquisition and
continuous table motion. Interference of motion to image formation is removed by
sweeping the center frequency of the receiver at a rate matching the table's
speed. Multiple regional images are collected and combined to reconstruct the
full FOV. The...
#Magnetic resonance imaging #Frequency #Image reconstruction #Encoding #Robustness #Data acquisition #Interference #Anatomy #Image segmentation #Coils
Vibro-acoustography for modal analysis of arterial vessels
- Trang 513-516
In order to apply vibro-acoustography for imaging of arteries, a theoretical
model of vibro-acoustics of thick arterial vessels is presented. The arterial
wall is modeled with the first order shear deformation theory. The fluids
outside and inside the artery are modeled with acoustic wave theory. The coupled
vibration of arterial tubes is analyzed with the wave propagation approach. The
experiment...
#Modal analysis #Arteries #Frequency #Ultrasonic variables measurement #Acoustic imaging #Deformable models #Acoustic waves #Acoustic propagation #Optical propagation #Rubber
High resolution segmentation of MR images of mouse heart chambers based on a partial-pixel effect and EM algorithm
- Trang 257-260
In this paper, a high resolution segmentation method for MR images of mouse
heart chambers is developed, in which the EM algorithm is adopted and extended
to the spatio-temporal cardiac cycle, and a partial pixel effect (PPE) is
accommodated so that the heart chambers boundary is detected to sub-pixel
accuracy. The method has been tested on high and low spatial resolution images.
Quantitative meas...
#Image resolution #Image segmentation #Mice #Heart #Spatial resolution #Area measurement #High-resolution imaging #Pixel #Testing #Biomedical imaging
Bio-array images processing and genetic networks modelling
- Trang 50-53
The new tools available for gene expression studies are essentially the
bio-array methods using a large variety of physical detectors (isotopes,
fluorescent markers, ultrasound, ...). Here we present an image processing
method independent of the detector type, dealing with the noise and with the
peaks overlapping, the peaks revealing the detector activity (isotopic in the
presented example), corre...
#Image processing #Genetics #Detectors #Data mining #Gene expression #Isotopes #Testing #Noise figure #Limit-cycles #Biomedical imaging
Fast, iterative, field-corrected image reconstruction for MRI
- Trang 489-492
Magnetic field inhomogeneities cause distortions in the reconstructed images for
non-cartesian k-space MRI (using spirals, for example). Several noniterative
methods are currently used to compensate for the off-resonance during the
reconstruction, but these methods rely on the assumption of a smoothly varying
field map. Recently, iterative methods have been proposed that do not rely on
this assump...
#Image reconstruction #Magnetic resonance imaging #Iterative methods #Spirals #Reconstruction algorithms #Equations #Fast Fourier transforms #Phase estimation #Image segmentation #Iterative algorithms
Synchrotron radiation coronary microangiography in isolated perfused rat heart for evaluation of coronary vascular response
- Trang 561-564
Visualization of vasoconstriction and vasodilatation of coronary arteries with
vasoactive agents is a useful research tool for evaluation of coronary vascular
reserve. Microangiography with spatial resolution in the micrometer range was
carried out to depict coronary vascular response in a rat heart under
Langendorff perfusion using a high-speed imaging system and a third generation
synchrotron ra...
#Synchrotron radiation #Heart #Optical imaging #X-ray imaging #Visualization #Arteries #High-resolution imaging #Spatial resolution #X-ray detection #X-ray detectors
Blind deconvolution of ultrasound images using partial spectral information and sparsity constraints
- Trang 1055-1058
The ability to enhance the resolution of ultrasound images by deconvolution
relies mainly on knowledge of the system's point spread function (PSF). The PSF
is usually unavailable due to its spatial nonstationarity, and it needs to be
estimated from the acquired data. Cepstrum-based techniques are unable to
correctly restore the spectral phase of the PSF. On the other hand, some
iterative (optimiza...
#Deconvolution #Ultrasonic imaging #Spatial resolution #Image resolution #Image restoration #Iterative methods #Optimization methods #Reflectivity #Constraint optimization #Testing
Fluorescence imaging in optical diffusion tomography
- Trang 58-61
A Bayesian optimization scheme is presented for reconstructing fluorescent yield
and lifetime, the absorption coefficient, and the scattering coefficient in
turbid media, such as biological tissue. The proposed method utilizes
measurements at both the excitation and emission wavelengths for reconstructing
all unknown parameters. A tissue phantom experiment uses the inversion strategy
to reconstruc...
#Fluorescence #Optical imaging #Tomography #Image reconstruction #Optical scattering #Biomedical optical imaging #Stimulated emission #Bayesian methods #Absorption #Biological tissues
3D tomographic reconstruction of binary images from cone beam projections: a fast level set approach
- Trang 677-680
This paper addresses 3D tomographic reconstruction of a binary image from a
small number of cone-beam projections. Under the binary hypothesis, the object
may be conveniently represented by its surfaces, and the reconstruction problem
solved using active contour methods. To handle complex topologies, we formalize
the problem in the framework of level sets using implicit descriptions of object
boun...
#Tomography #Image reconstruction #Level set #Surface reconstruction #Topology #X-ray imaging #Statistical analysis #Integral equations #Active contours #Biological system modeling
Magnetic resonance elastography technique for breast tissue in-vitro elasticity measurement
- Trang 931-934
A soft tissue elasticity measurement technique based on Magnetic Resonance
Elastography (MRE) is presented. In this technique, a tissue specimen is encased
in a gelatine-agar block with known elasticity modulus. This block is slowly
compressed using a MRI compatible device and displacements are measured using a
phase contrast MRI technique. These displacements are processed using an
iterative MRE ...
#Magnetic resonance #Breast tissue #In vitro #Elasticity #Biological tissues #Magnetic resonance imaging #Measurement techniques #Displacement measurement #Phase measurement #Testing