Proceedings IEEE International Symposium on Biomedical Imaging
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Fast, iterative, field-corrected image reconstruction for MRI
Proceedings IEEE International Symposium on Biomedical Imaging - - 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
Generalized series dynamic imaging with deformable references [MRI application]
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 789-792
Many imaging applications require the acquisition of a time series of images. Conventional full-scan methods acquire each of these images independently, resulting in a tradeoff between spatial resolution and temporal resolution. To address this problem, a generalized series-based reduced-encoding method has been proposed, which collects one or a few high-resolution references and a sequence of red......
#High-resolution imaging #Spatial resolution #Encoding #Image reconstruction #Image coding #Spline #Application software #Image resolution #Deformable models #Solid modeling
Classifying convex sets for vessel detection in retinal images
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 269-272
We present a method to detect vessels in images of the retina. Instead of relying on pixel classification, as many detection algorithms do, we propose a more natural representation for elongated structures, such as vessels. This new representation consists of primitives called affine convex sets. On these convex sets we apply the classification step. The reason for choosing this approach is two-fo......
#Retina #Eigenvalues and eigenfunctions #Image edge detection #Pixel #Reflection #Diabetes #Retinopathy #Performance evaluation #Kernel
Cardiac ultrasound motion detection by elastic registration exploiting temporal coherence
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 585-588
We propose a new global registration method for estimating the cardiac displacement field in 2D sequences of ultrasound images of the heart. The basic idea is to select a reference frame (e.g., the first image of a cycle) and to map each image in the sequence to it using elastic deformation. What makes our method specific is the use of a semi-local parametric model of the deformation (spatio-tempo......
#Ultrasonic imaging #Motion detection #Spline #Heart #Parametric statistics #Optimization methods #Displacement control #Noise robustness #Testing #Deformable models
Reconstruction of temperature distributions in a passive acoustic thermotomography
Proceedings IEEE International Symposium on Biomedical Imaging - - 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
Comparative evaluation of inversion algorithms for magnetic resonance elastography
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 997-1000
Magnetic resonance elastography (MRE) is a phase contrast based MRI imaging technique that can directly visualize and quantitatively measure propagating acoustic shear waves in tissue-like materials subjected to harmonic mechanical excitation. Full 3D complex displacement information can be acquired at MR pixel resolution throughout a 3D volume. This data allows the calculation of local quantitati......
#Magnetic resonance #Magnetic resonance imaging #Magnetic materials #Acoustic imaging #Data visualization #Acoustic measurements #Mechanical variables measurement #Phase measurement #Acoustic propagation #Acoustic waves
Mapping 3D myocardial wall motion over the left ventricle in a breath-hold
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 121-124
In magnetic resonance imaging, stimulated-echo based phase-contrast displacement mapping has been developed for various applications. This paper describes the adaptation and technical optimization of this idea for mapping the three-dimensional (3D) motion of the left ventricular wall in the human heart. Percentile wall thickening maps are obtained with a rapid and automatic data processing program......
#Myocardium #Heart #Spatial resolution #Humans #High-resolution imaging #Magnetic resonance imaging #Tagging #Displacement measurement #Motion measurement #Phase measurement
Optical coherence tomography: state of the art
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 102-105
Our setup has been devised in which the spatial focus and the interference condition coincide at an assumed average refractive index of the sample, independently of the position /spl Delta/z/sub Fiber/,, of the fiber tip which causes the depth scanning. Local deviations in refractive index on the order of 25 /spl mu/m can be tracked by small position changes /spl Delta/Z/sub L1/ of one lens within......
#Tomography #Refractive index #Skin #Spatial resolution #Image resolution #Biomedical optical imaging #Optical refraction #Optical variables control #Coherence #Focusing
Impact of axial collimation on hybrid PET image quality
Proceedings IEEE International Symposium on Biomedical Imaging - - 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
Pyramidal search of maximum coherence direction for biomedical image interpolation
Proceedings IEEE International Symposium on Biomedical Imaging - - Trang 887-890
A multiresolution technique for biomedical image interpolation is presented. It is an extension of the work on directional coherence interpolation (DCI) - a novel gray-level image interpolation method that interpolates the missing image data along the smoothed maximum coherence directions (MCDs). We propose to apply a pyramidal search strategy for MCD estimation. This coarse-to-fine scheme require......
#Biomedical imaging #Interpolation #Image segmentation #Image resolution #Image analysis #Image texture analysis #Pixel #Computational efficiency #Coherence #Biomedical engineering
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