The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Metabolites can serve as biomarkers. Estimation of metabolite concentrations from an in vivo MRS signal often uses a reference signal from water for correction of the spectral lineshape. When no reference signal is available, other methods must be applied. The present work concerns semi-parametric estimation of the perturbed line-shape from simulated signals of the metabolites themselves. Errors are...
In this contribution a new approach for inspecting crack and defects in known structures by using microwaves is presented. The novelty consists in using a new formulation of the linear sampling method called the no sampling linear sampling method to invert the scattered data, which results to be particularly fast and effective. Such a technique belongs to the category of qualitative methods and is...
The current work aims at the classification of breast tissue according to Breast Imaging Reporting and Data System (BIRADS), based on texture features from mammographic images. To this end an integrated software system was developed in visual C++ using the .NET 2.0 Framework. The system takes as inputs pictures in most of the popular bitmap formats as well as DICOM and provides as output a specific...
A new approach for EIT image reconstruction, based on a modified forward solution is proposed. In this approach, the EIT forward problem is solved via finite element method using two types of elements. At the early stage of the reconstruction, first order elements are used, and as the reconstruction error becomes lower than a predefined value, second order elements are used in the forward solution...
The purpose of this article is to present the system architecture, as well as, initial performance results from a low cost PET system specially designed for small animal planar imaging. This PET camera was designed and assembled from the ldquoDetector and Imaging Grouprdquo of the ldquoThomas Jefferson National Accelerator Facility, USA, in collaboration with the Medical Instruments dep. of Technological...
Since 9/11 there has been a growing interest to improve the security both of air travel and of cargo shipping. Visual inspection is the simplest tool and is very efficient, when single objects of small size are to be checked. The complexity of inspection increases as we have large "boxes" and when several objects are packed into a closed space, such as in a luggage or even in larger volumes...
The dominant powder scintillator in most medical imaging modalities for decades is Gd2O2S:Tb due to the very good intrinsic properties and overall efficiency. Except Gd2O2S:Tb there are alternative powder phosphor scintillators like Lu2SiO5:Ce and Gd2O2S:Eu that has been suggested for use in various medical imaging modalities. Gd2O2S:Eu emits red light and can be combined mainly with digital detectors...
In this keynote lecture some recently proposed approaches to microwave imaging for medical and industrial applications are discussed. The paper is focused on inverse scattering based techniques, mainly two-dimensional procedures, which can be categorized as qualitative and quantitative methods. Hybrid approaches are also discussed.
Magnification is a special technique applied to symptomatic women, usually following a screening mammogram. In this case small focal spots are necessary in order to reduce the geometrical unsharpness caused by the extended distance between the breast and the detector. Especially when combined with Gaussian x-ray intensity distributions with small standard deviation (sigma), small foci can lead to...
This paper presents and evaluates an ultra high-speed synchronous arbitration process for transient pixelspsila data of a neuromorphic temporal contrast imaging sensor. Enabling a high-precision timestamping, this system demonstrates its uniqueness for handling high peak rates and preserving the main advantage of the neuromorphic electronic systems, that is high and accurate temporal resolution. Based...
The proof of concept of using an interferometric ISAR simulator system in order to form a tool for false target decoy design purposes is presented in this paper. Emphasis is given to the explanation of the involved mathematical principles. The current scenario is the creation of a false target that exhibits corresponding glint effects at different distances to an approaching high resolution seeker...
An ordinary difficulty in assessing the severity of medical data is the confined ability to structurally organize the ensemble of different cases into semantically relevant classes. A conceivable visualization scheme of the entire set can potentially reveal critical data similarities and help the physicians to ocular estimate their initial diagnosis. In this paper, a novel method for efficient organization...
Polymer extrusion molding is an important process in the polymer manufacturing industry. It is crucial to measure and control the temperature of polymer melt. Although different techniques, such as thermocouple, infrared and ultrasonic, have been attempted to measure the temperature, there is no suitable means so far to measure the internal temperature in a cross section of a polymer extrusion process,...
Imaging systems based on impedance measurement are widely used in medical, process monitoring and non-destructive testing, where their hardware designs, measurement range and accuracy are often application-specific. Impedance analysers can deliver excellent performance in terms of reliability, resolution and accuracy. A multi-channel imaging system has been developed using an impedance analyser with...
Crude oil separation is an important process in the oil industry. To make efficient use of the separators, it is important to know their internal behavior, and to measure the levels of multi-interfaces between different materials, such as gas-foam, foam-oil, oil-emulsion, emulsion-water and water-solids. A single-rod multi-modality multi-interface level sensor is presented, which has a current source,...
The detection of foreign bodies inside wood trunks is a key task in the wood processing industry. Bullets, screws, or other debris can severely damage carpentry machinery, and, consequently, must be removed prior to processing. In this paper, the feasibility of a new prototype of microwave tomograph for the detection of metallic inclusions inside wood trunks is analyzed. Numerical simulations show...
We investigate the use of mammograms texture features in a clinical evaluation in mammography in order to assist in the classification of an image based on the breast tissue index. Breast tissue indices give the possibility to analyze images and determine the similarity of the images and evaluate the classification of the obtained image The measures of similarity of images used for the texture analysis...
Portable chest radiographs are performed on the most critically-ill patients, who need highly skilled patient care and the best diagnostic tools. However, such radiographs are usually of low quality, mainly due to misaligned body positioning during their acquisition, and subject to a higher misinterpretation rate than the ones obtained with a non-portable X-ray device. This paper presents a pioneering...
We present the detailed imaging of structures and processes of the nematode Caenorhabditis elegans (C. elegans) using non-linear microscopy (TPEF-SHG-THG). Consummative and specific information about the anatomy of the nematode was collected by implementing a combination of THG, SHG and TPEF image contrast modalities on the same microscope. Additionally, 3-D reconstruction of TPEF and THG images was...
A modification of Singular Value Decomposition (SVD) is proposed in this aiming at de-noising and finding more accurately the statistically independent spectra of metabolite sources in Magnetic Resonance Spectroscopy (MRS) quantification. Although SVD is known in MRS applications and several efficient algorithms exist for estimating SVD summation terms in which the raw MRS data is analyzed, however,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.