Proceedings IEEE International Symposium on Biomedical Imaging
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Rapid MR image acquisition in the presence of background gradients
- Trang 725-728
Image acquisition in magnetic resonance imaging (MRI) is based on the application of external gradients to traverse the 2D Fourier domain of the object, known as k-space. This model holds up very well provided the underlying magnetic field is highly homogeneous, however, this is often not the case, particularly for higher field MRI. The constant component of magnetic field inhomogeneity can lead t......
#Magnetic resonance imaging #Magnetic fields #Image reconstruction #Equations #Distortion #Biomedical engineering #Spirals #Image analysis #Magnetic analysis #Image quality
An accurate segmentation method for white blood cell images
- Trang 245-248
A part of our research work on an Automated Cell Count project is described. A major requirement for this project is an efficient method to segment cell images. This work presents an accurate segmentation method for an automatic count of white blood cells. First a simple thresholding approach is applied to give initial labels to pixels in the blood cell images. The algorithm is based on priori inf......
#Image segmentation #White blood cells #Cells (biology) #Shape #Image edge detection #Laboratories #Pixel #Lighting #Morphology #Red blood cells
Harmonic multiresolution estimators for denoising and regularization of SPECT-PET data
- Trang 697-700
This paper presents a study on the development of new multiresolution directional analysis tools for texture denoising of medical images. Multiresolution. texture analysis is performed with wavelet packets and brushlet expansions to exploit spatio-temporal coherence and identify persistent anatomical structures while removing uncorrelated noise components. Denoising is performed via thresholding e......
#Noise reduction #Image texture analysis #Performance analysis #Image resolution #Image analysis #Biomedical imaging #Wavelet analysis #Wavelet packets #Coherence #Anatomical structure
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
In vivo imaging of blood-spinal cord barrier permeability with dynamic contrast enhanced MRI of spinal cord injury
- Trang 153-156
Serial in vivo dynamic contrast enhanced MRI studies were performed on spinal cord injured rats on post-injury days 0, 10, 20 and 30 to determine the distribution of gadopentetate-dimeglumine (Gd) concentration in injured cord tissue. A two-compartment pharmacokinetic model was fitted to describe the time course of the concentration data at the epicenter of injury for each post-injury day. From th......
#In vivo #Permeability #Magnetic resonance imaging #Rats #Animals #Coils #Spinal cord injury #Spinal cord #Plasma transport processes #Image restoration
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
Robust rotations between anatomical curves
- Trang 337-340
We give a method for estimating the optimal rotation between anatomical curves corrupted by segmentation noise. We formulate the energy function probabilistically and use an annealing algorithm with explicit outlier rejection to stabilize our solution. We also provide methods for a nearly symmetric estimation of the rigid transformation between three-dimensional curve pairs. We evaluate the perfor......
#Simulated annealing #Biology computing #Entropy #Noise robustness #Biomedical engineering #Radiology #Acoustic noise #Biomedical imaging #Biological control systems #Image segmentation
Movement correction of fMRI time-series using intrinsic statistical properties of images: an independent component analysis approach
- Trang 765-768
A 3D image registration method for alignment of functional magnetic resonance imaging (fMRI) time-series, based on independent component analysis (ICA), is described. Movement during acquisition of an fMRI time-series corrupts the statistics of the acquired data, resulting in an increase in the joint entropy of the data and a decrease in the entropy of a nonlinear function of the independent compo......
#Independent component analysis #Entropy #Interpolation #Image registration #Parameter estimation #Cost function #Vectors #Magnetic properties #Magnetic resonance imaging #Statistics
Reconstruction of temperature distributions in a passive acoustic thermotomography
- Trang 1011-1014
Passive acoustic thermotomography is a method for measuring 2-D and 3-D temperature distributions deep inside biological objects using measurements of the objects own thermal acoustic radiation. Acoustic radiation, coming from deep within a body, is measured at 20 points on the surface and for every point the acoustic radiation is measured at a different angle to the surface. The key step in the m......
#Temperature distribution #Acoustic measurements #Temperature measurement #Inverse problems #Surface reconstruction #Humans #Hyperthermia #Area measurement #Time measurement #Equations
Supertemporal resolution of functional MRI timecourse data
- Trang 911-914
High temporal resolution is critical in understanding the faster evolving processes in the blood oxygenation level dependent (BOLD) response used in functional magnetic resonance imaging. However, sampling rates faster than the T1 relaxation rate may introduce distortions of the measured BOLD signal due to spin saturation and blood inflow effects. We have developed a technique called the supertemp......
#Magnetic resonance imaging #Signal resolution #Distortion measurement #Image resolution #Blood #Signal sampling #Rate distortion theory #Timing #High-resolution imaging #Sampling methods