Proceedings IEEE International Symposium on Biomedical Imaging
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Image quality evaluation of flat panel detector binning in x-ray fluoroscopy
- Trang 177-180
Pixel-binning is used in flat-panel (FP) x-ray detectors for fluoroscopy to increase signal-to-noise ratio (SNR) and lower digital data rates. In this study, we quantitatively assessed image quality of image sequences acquired with and without binning using a clinically relevant task of detecting the tip of a guidewire. Detection was evaluated at two exposures and at two different orientations wit......
#Image quality #X-ray detection #X-ray detectors #X-ray imaging #Image sequences #Pixel #Signal to noise ratio #Degradation #Thin film transistors #Biomedical engineering
Independent component imaging of disease signatures
- Trang 457-460
This paper describes a neural computation approach to independent component imaging of disease signatures. The novel feature is to separate mixed imagery sources blindly over an informative index subspace. The recovery of patterns is achieved by independent component analysis, whose parameters are estimated using the infomax principle. We discuss the theoretic roadmap of the approach, and its appl......
#Diseases #Independent component analysis #Positron emission tomography #Parameter estimation #Gene expression #Neoplasms #Contamination #Computer science #Paper technology #Radiology
Synchrotron radiation /spl mu/CT of biological tissue
- Trang 365-368
Synchrotron Radiation (SR) /spl mu/CT allows improving the performance of standard ACT in terms of spatial and density resolution, signal to noise ratio, and acquisition time. SR ACT is available or in development in most synchrotron facilities. After a brief description of the ID19 ESRF SR /spl mu/CT set up, the differences between images acquired using SR ACT and ACT are highlighted. The potenti......
#Synchrotron radiation #Biological tissues #Biomedical imaging #Strontium #Spatial resolution #High-resolution imaging #X-ray imaging #Optical imaging #Image reconstruction #Computed tomography
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
A scripting language approach to control software for cryo-electron microscopy
- Trang 301-304
Cryo-electron microscopy (Cryo-EM) of single particles has developed into a widely used technique for determining the 3-dimensional structure of large molecules and molecular assemblies. The low signal-to-noise ratio of cryo-EM requires thousands of images of single molecules to be averaged together. The field has matured to the point where realization of high-resolution structures is limited prim......
#Microscopy #Image reconstruction #Assembly #Signal to noise ratio #Software packages #Engines #Automatic control #Process control #Control systems #Software systems
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
Infrared tissue imaging at on-the-spot laser delivery using an all-optical-waveguide transmitting system
- Trang 281-284
We present experimental results on mid-infrared thermal imaging of micro-scale tissue area irradiated by an all-optical-waveguide laser delivery system. The infrared transmitting system is based on a novel and simple laser delivery technique that includes two key optical elements: a grazing-incidence-based uncoated hollow taper used for direct infrared laser-to-fiber coupling, and a tissue-activat......
#Infrared imaging #Optical imaging #Free electron lasers #Fiber lasers #Laser modes #Biomedical optical imaging #Optical coupling #Optical sensors #Optical fibers #Laser theory
Ultrasound propagation model for attenuation reduction and cardiac contrast perfusion visualization
- Trang 445-448
A mathematical model of ultrasound signal propagation through cardiac muscle has been designed and applied to myocardial contrast images of the heart. The fundamental frequency component of the propagating signals serves in the model for attenuation estimation. These estimates are used to reduce the effect of tissue attenuation on the harmonic component of the received signals, which are used for ......
#Ultrasonic imaging #Attenuation #Visualization #Power harmonic filters #Myocardium #Frequency #Heart #Acoustic pulses #Signal generators #Mathematical model
Advances in measurements of ultrasound fields in the frequency range 20-60 MHz
- Trang 978-980
A powerful measurement technique suitable for virtually continuous calibration of ultrasonic hydrophone probes in the frequency range 250 kHz-60 MHz is described and frequency responses of PVDF polymer hydrophones are presented. The validity of the calibration results was examined using independent calibration techniques. The values of sensitivity in V/Pa obtained using a linear swept frequency te......
#Frequency measurement #Ultrasonic variables measurement #Ultrasonic imaging #Calibration #Sonar equipment #Probes #Measurement techniques #Polymers #Nonlinear wave propagation #Laboratories
Noise-adaptive anisotropic diffusion filtering of MRI images reconstructed by SENSE (sensitivity encoding) method
- Trang 701-704
SENSE (SENSitivity Encoding) imaging provides significant acquisition speedups in MRI. The main drawback of the method is that it generates images that have increased and spatially nonuniform noise levels and, hence, will often require retrospective filtering. In this paper, we show that standard anisotropic diffusion filtering, while being an effective technique for edge-preserving denoising of i......
#Anisotropic magnetoresistance #Filtering #Magnetic resonance imaging #Image reconstruction #Image coding #Noise level #Encoding #Image generation #Noise reduction #Filters