A fully 3D OSEM reconstruction method for positron emission tomography (PET) based on symmetries and sparse matrix technique is described. Great savings in both storage space and computation time were achieved by exploiting the symmetries of scanner and sparseness of the system matrix. More reduction of storage requirement was obtained ...

The combination of Fourier rebinning (FORE) and the ordered subsets expectation-maximization (OSEM), a fast statistical algorithm, appears as a promising alternative to the fully three-dimensional (3-D) iterative approach for clinical positron emission tomography (PET) data. In this paper, we evaluated the properties of FORE+OSEM and compared it with fully ...

Positron emission tomography (PET) and computed tomography (CT) together are a powerful diagnostic tool, but imperfect image quality allows false positive and false negative diagnoses to be made by any observer despite experience and training. This work investigates PET acquisition mode, reconstruction method and a standard uptake value (SUV) correction scheme on the ...

We study the application of Fourier rebinning methods to dual-planar cone-beam SPECT. Dual-planar cone-beam SPECT involves the use of a pair of dissimilar cone-beam collimators on a dual-camera SPECT system. Each collimator has its focus in a different axial plane. While dual-planar data is best reconstructed with fully three-dimensional (3-D) iterative methods, these methods are slow and have ...

The interest in positron emission tomography (PET) and particularly in hybrid integrated PET/CT systems has significantly increased in the last few years due to the improved quality of the obtained images. Nevertheless, one of the most important limits of the PET imaging technique is still its poor spatial resolution due to several physical factors ...

A fully 3D iterative image reconstruction algorithm has been developed for high-resolution PET cameras composed of pixelated scintillator crystal arrays and rotating planar detectors, based on the ordered subsets approach. The associated system matrix is precalculated with Monte Carlo methods that incorporate physical effects not included in analytical models, such as positron ...

A fully 3D iterative image reconstruction algorithm has been developed for high-resolution PET cameras composed of pixelated scintillator crystal arrays and rotating planar detectors, based on the ordered subsets approach. The associated system matrix is precalculated with Monte Carlo methods that incorporate physical effects not included in analytical models, such as positron ...

Accurate system modeling in tomographic image reconstruction has been shown to reduce the spatial variance of resolution and improve quantitative accuracy. System modeling can be improved through analytic calculations, Monte Carlo simulations, and physical measurements. The purpose of this work is to improve clinical fully-3-D reconstruction without substantially increasing ...

Accurate system modeling in tomographic image reconstruction has been shown to reduce the spatial variance of resolution and improve quantitative accuracy. System modeling can be improved through analytic calculations, Monte Carlo simulations, and physical measurements. The purpose of this work is to improve clinical fully-3-D reconstruction without substantially increasing ...

Noise equivalent count rate (NECR) and image noise are two different but related metrics that have been used to predict and assess image quality, respectively. The aim of this study is to investigate, using patient studies, the relationships between injected dose (ID), body mass index (BMI) and scanner type on NECR and image noise ...

Noise equivalent count rate (NECR) and image noise are two different but related metrics that have been used to predict and assess image quality, respectively. The aim of this study is to investigate, using patient studies, the relationships between injected dose (ID), body mass index (BMI) and scanner type on NECR and image noise ...

... BEAMS, IMAGES, POWER SUPPLIES, TOROIDS, COMPENSATION, INDUCTION SYSTEMS, ELECTRON ACCELERATORS, BETATRONS. ...

... FOURIER TRANSFORMATION, ACCELERATION, THESES, OPTICAL IMAGES, MONTE CARLO METHOD, POSITION FINDING, ATMOSPHERIC ...

With a goal of providing means for accelerating the image processing, machine vision, and testing of

Several methods for imaging using accelerated heavy ion beams are being investigated at Lawrence Berkeley Laboratory. Using the HILAC (Heavy-Ion Linear Accelerator) as an injector, the Bevalac can accelerate fully stripped atomic nuclei from carbon (Z = 6...

These are instructions for measuring the velocity and acceleration of a CME using NIH Image software. Read the Motion of a CME Lesson Plan first. ...

The importance of particle acceleration may be judged from the number of applications which require some sort of accelerated beam. In addition to accelerator-based high energy physics research, non-academic applications include medical imaging and treatme...

The measurements will improve our understanding of quantum mechanics. The measurements are very sensitive to minuscule accelerations. ...

... Title : ANALYSIS OF EXPOSURE FACTORS INFLUENCING THE IMAGE QUALITY IN LINEAR ACCELERATOR RADIOGRAPHY. ...

Accelerated Proton Echo Planar Spectroscopic Imaging (PEPSI) Using GRAPPA with a 32-Channel Phased the encod- ing time of MR spectroscopic imaging (MRSI). Here we inves- tigate up to 5-fold acceleration of 2 words: proton echo planar spectroscopic imaging; PEPSI; MR spectroscopic ...

A Super-Efficient Particle Accelerator. This image, created from data obtained from NASA's Chandra X-ray Observatory and the European Southern Observatory's ...

Using an image taken by the Large Angle and Spectrometric Coronagraph (LASCO) instrument on board the Solar and Heliospheric Observatory (SOHO) spacecraft, along with the National Institutes of Health (NIH) Image program for image processing, students investigate the acceleration of a coronal mass ejection (CME) ...

Lab Department of Electrical Engineering University of Southern California USC Electrical Engineering Electrical Engineering Acceleration Methods � Partial Fourier � Variable-density sampling � Parallel imaging � Reduced FOV excitation � Compressed sensing � Temporal acceleration � etc. USC Electrical Engineering

A full account is given of an experimental series in which higher density regions of ablatively accelerated planar targets were directly imaged by flash x-radiography. Flash x-radiography has previously been used to obtain images of pellet implosions and ...

Accelerating a C++ Image Processing Library with a GPU Jay L. T. Cornwall Department of Computing in light of their uses in GPU code generation. We conclude with results from a performance evaluation the GPU was orig- inally intended purely for graphics applications, a growing number of promising

... an acceleration of coronary artery disease, peptic ulcer disease, reproductive disturbances, esophageal reflux, hypertension, fetal illnesses and death, ...

Acceleration of Procedure; Reduction of Number of Transports and Transfers; Involved Staff Member's Evaluation

... combustion in blunt body flows, oblique ... modeling with the imaging experiments, and ... REACTIONS, BLUNT BODIES, DETONATIONS, SCHLIEREN ...

... The high speed imaging demonstrated strong head acceleration/jolting accompanied by typical intracranial hematomas and brain swelling. ...

... Computations onto FPGA Based Accelerators," Proc ... FPGAs for Signal and Image Processing Applications Described in MATLAB," Proc ...

... to the fusion application, was attempted. The results substantiate the need for improved laser uniformity and hgh speed imaging diagnostics. ...

... fractures. Four forms of diagnostic imaging (radiographs, bone scan, MRI and CT) are performed on each subject. The ...

100CX scanning transmission electron microscope (STEM) are currently the ... was performed with an ISI SEM at an accelerating voltage of 20 kV. Images are ...

Using the radio through hard X-ray images of the Crab nebula to derive the spatial dependence of the

, helical tomotherapy and robotic linear accelerators, 4D radiation therapy, although still in the research

The wave accelerated electron auroras are produced by converting the high intensity wave energy (Poynting) fluxes into electron energy and therefore the ...

part 2. OPTIMAL. RESOLUTION. IN. MAXIMUM. ENTROPY. IMAGE. RECONSTRUCTION. FROM. PROJECTIONS. WITH. MULTIGRID. ACCELERATION ...

... We have implemented a high-dynamic range panoramic image viewer using hardware- accelerated HDRTMs, similar to panoramic image viewers ...

We present the first comparison between radio images of high-energy electrons accelerated by a solar

Microwave heating accelerates quantitative squaraine rotaxane formation by slipping and facilitates production of a bacterial imaging probe with zinc dipicolylamine targeting ligands.

This page provides images from the Lawrence Livermore National Laboratory. Topics include the National Ignition Facility, supercomputing facility, center for accelerator mass spectrometry, National Atmospheric ...

In-situ particles and fields in acceleration regions; Multiwavelength (X-ray, UV , IR) auroral imaging; Fabry-Perot interferometer for winds; ENA imaging of ...

Whisible imaging, temperature, pressure, radiation, velocity, acceleration levels, ignitor power, and flow rate. 3. SPECIES-SPECIFIC INFRARED IMAGING ...

Nov 10, 2008 ... FORCE LIMITED VIBRATION TEST OF HESSI IMAGER ... The vibration tests were acceleration controlled and force limited, in order to prevent ...

The goals of the Molecular Imaging Program (MIP) are to develop targeted imaging methods that lead to an improved understanding of cancer biology, thereby accelerating the development of cancer therapies.

ACCELERATED 3D MRI OF VOCAL TRACT SHAPING USING COMPRESSED SENSING AND PARALLEL IMAGING Yoon MRI: The application of compressed sensing for rapid MR imaging," Magn Reson Med, 2007; 58 of compressed sensing MRI with parallel imaging to 3D imaging of vocal tract shaping during sustained sound

The advent of GPU hardware and associated software libraries for scientific computing renders possible acceleration of parallelisable problems by a typical factor of 10-100. We present the first GPU-accelerated and open source image reconstruction software for optical/infrared interferometry, making use of the OpenCL library. Finally ...

The capability to simulate the imaging performance of new detector concepts is crucial to develop the next generation of medical imaging systems. Proper modeling tools allow for optimal designs that maximize image quality while minimizing patient and occupational radiation doses. In this context, in silico imaging ...

We have developed a thermal-neutron coded-aperture imager that reveals the locations of hydrogenous materials from which thermal neutrons are being emitted. This imaging detector can be combined with an accelerator to form an active interrogation system i...

Motivated by the desire to minimize specimen damage in beam sensitive specimens, there has been a recent push toward using relatively low accelerating voltages (<100kV) in scanning transmission electron microscopy. To complement experimental efforts on this front, this paper seeks to explore the variations with accelerating voltage of the ...

Beam breakup and image displacement instability growth rates for a 1 kA, 40 MeV electron beam racetrack induction accelerator are computed, The hypothetical device is taken to have four acceleration gaps, each with 0.2 MeV applied voltage and 15 ohm trans...

Fast Simultaneous Alignment of Multiple Range Images Using Index Images Takeshi Oishi Institute parameters. We propose a fast searching method using "index images," which work as look-up tables is accelerated by using index images, which are rapidly created without sensor parameters. 2) The ...

This patent describes a position sensitive detector for imaging incident radiation, charged particles and/or energetic neutral particles. It comprises: means for detecting the radiation and/or charged particles and producing an amplified and accelerated charged image which corresponds spatially to the incident radiation and/or charged ...

The improvement of MRI speed with parallel acquisition is ultimately an SNR-limited process. To offset acquisition- and reconstruction-related SNR losses, practical parallel imaging at high accelerations should include the use of a many-element array with a high intrinsic signal-to-noise ratio (SNR) and spatial-encoding capability, and an advantageous ...

The report describes research performed at Stanford University to investigate ram accelerator phenomena using expansion tube and shock tube facilities. The program included three coordinated elements: imaging and modeling of oblique detonations and shock-...

The outline of this document is: Jefferson Lab; Collaboration, Capability Growth; 12GeV Energy Updgrade; Acceleration and Radiation in Vacuum; Superconducting Linear Collider and SRF Control; Other Initiatives: HELIOS and Biomedical Imaging; and Outlook.

A Super-Efficient Particle Accelerator. 06.30.09. Supernova remnant RCW 86. This image of data from NASA's Chandra X-ray Observatory and the European ...

It is shown by 5-nanosecond image converter photography and neutron scintillators that the neutrons coming from the 'plasma focus' at the end of a plasma coaxial accelerator are produced by the mutual annihilation of ortho plasma vortices and not by the m...

The loading of inductors in the KUTI-20 induction accelerating system by the electron-ion ring; the energy losses of the ring due to the excitation of the currents in the quiding magnetic field coils and deceleration of the ring by image charges during it...

The SuperNova Acceleration Probe (SNAP) instrument is being designed to collect image and spectroscopic data for the study of dark energy in the universe. In this paper, we describe a distributed architecture for the data acquisition system which interfac...

The AATF has been used to study wakefield acceleration and focusing in plasmas and rf structures. A PC-based system is described which incorporates the functions of beamline control and acquisition, storage, and preliminary analysis of video images from l...

We use high time cadence images acquired by the STEREO EUVI and COR instruments to study the evolution of coronal mass ejections (CMEs) from their initiation through impulsive acceleration to the propagation phase. For a set of 95 CMEs we derived detailed height, velocity, and acceleration profiles and statistically analyzed ...

We have developed a quasianamorphic optical tomography system coupled to a streak camera to provide continuous recording of the electron beam profile of an intense, long-pulse induction accelerator. A tomographic reconstruction method based on a maximum-entropy algorithm is used to reconstruct the images. The system has simplified the calculation of beam ...

In modern high-energy physics, a powerful electromagnetic field must be supplied for some elementary particles to be accelerated by passing through the region of high-energy physics fields. The electric current and high voltage producing the powerful electromagnetic field are very important to high-energy accelerators, but the insulation of electromagnetic ...

In past years particle accelerators have become increasingly important tools for the advancement of medical science. From the pace of advancing technology and current directions in medical research, it is clear that this relationship between accelerators and medicine will only grow stronger in future years. In view of this importance, this relationship is ...

This online article written by Sven Kullander at the Nobel e-Museum discusses the importance of particle accelerators to physics in a historical context. After studying their basic operatation, users can then learn about the many accelerator inventions and their assistance in various discoveries such as x-rays and electrons. The website provides links to ...

Very slow, highly charged ions impinging on metal surfaces are known to be accelerated by their image and to drop irremediably on the surfaces which they touch or slightly penetrate. We present experiments which demonstrate that above insulators or semiconductors, at normal incidence, the ions are backscattered at a certain distance from the surface and do ...