Proceedings IEEE International Symposium on Biomedical Imaging
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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
Deformable m-rep segmentation of object complexes
- Trang 26-29
While we have previously reported on multiscale segmentation of single-figure
anatomic objects from medical images by deformable m-rep models, here we report
on a method of segmentation of multiple geometrically related single-figure
objects from a medical image. Inter-object geometric effects within segmentation
of structures in the male pelvis from CT in the planning of radiation therapy of
the ...
#Deformable models #Image segmentation #Biomedical imaging #Atomic measurements #Solid modeling #Coordinate measuring machines #Position measurement #Displays #Image analysis #Pelvis
Improved interstitial and intravascular MR imaging coils
- Trang 963-965
An improved intravascular (IV) and interstitial (IS) prototype magnetic
resonance (MR) imaging coil design offers dramatic gains in signal-to-noise
ratio (SNR) and imaging volume. A multi-turn rectangular solenoid was wound
inside catheters with 1.7 mm (IV) and 3.0 mm (IS) diameters. A factor of 200 in
peak SNR gain over the standard birdcage head coil was observed, with the region
of improved SNR...
#Coils #Magnetic resonance imaging #Catheters #Prototypes #Magnetic resonance #Signal design #Signal to noise ratio #Solenoids #Wounds #Head
Feedback coherent anisotropic diffusion for high resolution image enhancement
- Trang 693-696
Anisotropic diffusion has proved efficiency in filtering wide range of images.
However, its application to improve SNR in MR images was limited due to the
minute details existing in many medical image modalities e.g., MR and CT images.
Therefore, these types of images require sophisticated sensitive filtering
methods. In this paper we propose a modified variational model based on the
coherent diff...
#Feedback #Anisotropic magnetoresistance #Image resolution #Image enhancement #Biomedical imaging #Computed tomography #Information filtering #Information filters #Degradation #Coherence
Depth-of-interaction effects in columnar phosphors for exponential X-ray absorption
- Trang 557-560
The depth-dependent blur of phosphor screens have been studied using analytical
and numerical methods by a number of investigators. We present an analysis of
the effect of depth-of-interaction on the modulation transfer function of
columnar phosphor screens. We extend our previously reported results of single
X-ray interactions to the study of X-ray beams that exponentially deposit energy
in the p...
#Phosphors #Electromagnetic wave absorption #X-ray imaging #Optical sensors #Sensor arrays #Optical refraction #Optical scattering #Optoelectronic and photonic sensors #Optical detectors #X-ray detection
Non-rigid registration of medical images: purpose and methods, a short survey
- Trang 465-468
Non-rigid registration is an important topic in the medical imaging community
and a variety of methods have been proposed to solve this problem. This
manuscript serves as an introduction to a special session dedicated to non-rigid
registration. Its intent is to provide the reader with a sense for the type of
problems to be solved and the range of solutions that have been proposed. Each
of the spea...
#Biomedical imaging #Ultrasonic imaging #Magnetic resonance imaging #Image registration #Optical imaging #Instruments #Single photon emission computed tomography #Magnetic resonance #Design methodology #Packaging
Searching similar images for classification of pulmonary nodules in three-dimensional CT images
- Trang 189-192
This paper aims at obtaining diagnosis and prognosis information by searching
similar images into a three-dimensional (3-D) CT image database of pulmonary
nodules for which diagnosis is known. For this purpose, we propose an automatic
method to retrieve nodule candidates with similar characteristics from the
database. Each pulmonary nodule image is represented by the distribution pattern
of CT den...
#Computed tomography #Image databases #Cancer #Lungs #Spatial databases #Information retrieval #Clinical diagnosis #Image segmentation #Biomedical optical imaging #Optical sensors
Electrical impedance imaging with electrode models: initial in vivo experience in the breast
- Trang 1043-1046
Electrical impedance imaging of the breast is potentially promising but faces a
number of challenges related to improving the sensitivity and reliability of the
technique. Electrode models have been accepted as important components of image
reconstruction but little practical experience with their use during image
reconstruction from in vivo data has been reported. In this paper, we describe
our a...
#Electrodes #In vivo #Breast #Image reconstruction #Surface impedance #Conductivity #Surface reconstruction #Mathematical model #Image quality #Electric potential
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
MRI signal reconstruction by Fourier frames on interleaving spirals
- Trang 717-720
Interleaving spirals are a natural setting for attaining fast MRI signal
reconstruction. Using the results of Beurling and Landau, as well as
quantitative coverings of the spectral domain by translations of the polar set
of the target disk space E, harmonics for Fourier frames F are constructed on
interleaving spirals to reconstruct signals on E. Because of the weak Fourier
frame bound estimates b...
#Magnetic resonance imaging #Signal reconstruction #Interleaved codes #Spirals #Image reconstruction #Fourier transforms #Differential equations #Nuclear magnetic resonance #Mathematics #Educational institutions