| Optimizing and Evaluating an Integrated SPECT-CmT System Dedicated to Improved 3-D Breast Cancer Imaging |
May-2009 |
64 pages |
| Authors:
Dominic J Crotty; DUKE UNIV DURHAM NC
|
 | The overall objective of this research is to optimize the development of a combined dual-modality single photon emission computed tomography (SPECT) and x-ray computed mammotomography (CmT) system for the earlier detection and staging of breast cancer, improving surgical biopsy guidance, and the monitoring of patient therapy response. Co-registered acquisition of emission (nuclear) and transmission (x-ray) data using both 3D imaging modalities in a common field of view may aid to ... |
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| An Extensive X-ray Computed Tomography Evaluation of a Fully Penetrated Encapsulated SiC MMC Ballistic Panel |
Apr-2009 |
20 pages |
| Authors:
William H Green; Robert H Carter; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| X-ray computed tomography (XCT) is an important nondestructive evaluation technique for revealing the spatial distribution of ballistically induced damage in ceramics. The level of detection and resolution of damage depends on the size of the sample and the parameters of the XCT approach (e.g., focal spot size, magnification, etc.). Previous and ongoing work in this area includes assessment of ballistically induced damage in both individual ceramic targets and ceramic armor ... |
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| Cone-Beam Computed Tomography for Image-Guided Radiation Therapy of Prostate Cancer |
Jan-2009 |
53 pages |
| Authors:
Seungryong Cho; CHICAGO UNIV IL
|
| The success of intensity-modulated radiation therapy (IMRT) or 4-D conformal radiation therapy (CRT) is heavily reliant on accurate image-guidance in prostate cancer treatment. Cone-beam computed tomography (CBCT) is becoming one of the dominant imaging modalities for image-guidance, but current technology based on Feldkamp algorithm for image reconstruction from a circular scanning trajectory does not yield sufficient quality of images. In addition, imaging-radiation dose is one of the key issues, which ... |
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| A Data Mining Approach for Acoustic Diagnosis of Cardiopulmonary Disease |
JUN 2008 |
|
| Authors:
Bryan C. Flietstra; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
 | Variations in training and individual doctor's listening skills make diagnosing a patient via stethoscope based auscultation problematic. Doctors have now turned to more advanced devices such as x-rays and computed tomography (CT) scans to make diagnoses. However, recent advances in lung sound analysis techniques allow for the auscultation to be performed with an array of microphones, which send the lung sounds to a computer for processing. The computer automatically identifies ... |
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| Optimization of Tomosynthesis Imaging for Improved Mass and Microcalcification Detection in the Breast |
01-Apr-2008 |
19 pages |
| Authors:
Dan Xia; CHICAGO UNIV IL
|
| The goal of this research is to obtain systematic understandings of the effects of various physical factors that are important in breast tomosynthesis imaging and to develop techniques for effectively dealing with their effects and for reducing radiation dose. During the second year of the project we have achieved fruitful results based upon the progress made in our first year of the project. Specifically we have further investigated the performance ... |
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| Design, Implementation, and Characterization of a Dedicated Breast Computed MammoTomography System for Enhanced Lesion Imaging |
01-Mar-2008 |
29 pages |
| Authors:
Randolph L McKinley; DUKE UNIV DURHAM NC
|
| The overall goal of this work was to design, implement, and characterize a novel dedicated mammotomography system for enhanced lesion detection. This novel system allows fully 3-D imaging of a pendant, uncompressed breast using novel 3-D complex orbit capabilities. A prototype system has been designed, developed, and extensively characterized with a number of figures of merit including SNR, dose efficiency, and contrast sensitivity. Results indicate the potential for sub dual-view ... |
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| Contrast Agents for Micro-Computed Tomography of Microdamage in Bone |
01-Jan-2008 |
36 pages |
| Authors:
Ryan K Roeder; NOTRE DAME UNIV IN
|
| Novel methods have been developed for detecting damaged bone tissue using micro-computed tomography (micro-CT) and contrast agents with higher x-ray attenuation than bone. The ability to detect the presence and to a limited extent the morphology of microdamage in cortical and trabecular bone using micro-CT was demonstrated using a barium sulfate (BaSO4) stain. Gold nanoparticles (Au NPs) were prepared and functionalized with L-glutamic acid for chelating calcium in damaged bone ... |
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| Development and Characterization of Novel Volumetric Acquisition Orbits with an Application Specific Emission Tomograph for Improved Breast Cancer Detection |
AUG 2007 |
17 pages |
| Authors:
Kristy Perez; Caryl N. Brzymialkiewicz; DUKE UNIV DURHAM NC
|
| The overall goal of this work was to develop, implement, and evaluate novel three-dimensional acquisition orbits for a dedicated emission mammotomography system. The system can revolve around a pendant, uncompressed breast with fully three dimensional orbital trajectories, which allow for chest wall and axillary imaging. Further optimization and characterization of the system's flexible trajectories and resulting reconstructed images continues. Upon the recommendations from this and prior work, one patient study ... |
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| Early Detection of Breast Cancer via Multiplane Correlation Breast Imaging |
01 APR 2007 |
42 pages |
| Authors:
Anuj J. Kapadia; DUKE UNIV DURHAM NC
|
| We are developing a tomographic technique called Neutron Stimulated Emission Computed Tomography (NSECT) for early detection of breast cancer. NSECT is sensitive to metabolic changes in trace element concentrations that are seen in tumors at very early stages of development. Detecting and measuring these element concentrations has the potential to detect breast cancer early. Using neutrons as the imaging radiation leads to significant concerns about patient dose. While preliminary experiments ... |
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| Optimization of Tomosynthesis Imaging for Improved Mass and Microcalcification Detection in the Breast |
APR 2007 |
38 pages |
| Authors:
Dan Xia; CHICAGO UNIV IL
|
| Although considerable progress has been made for the breast tomosynthesis, there are still some issues should be addressed before it becomes suitable for routine clinical use: (1) development of accurate and efficient algorithms for reconstructing 3D breast images from tomosynthesis data, (2) the effect of various physical factors on image quality. During the first year of this research, we have implemented and investigated the TV-based algorithm for image reconstruction in ... |
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| Enhancement of the Computational Efficiency of Membrane Computing Models |
APR 2007 |
56 pages |
| Authors:
Digendra K. Das; DAS (DIGENDRA K) SAUQUOIT NY
|
| Part I: The researchers developed a comprehensive transitional P-system Membrane Computing model. Membrane computing consists of cell-like membranes placed inside a unique skin membrane. In regions delimited by a membrane structure, cells are placed in multisets of objects which evolve according to evolution rules associated with the regions. The researchers considered multi-sets of objects, usually multi-sets of symbols, objects and a set of evolution rules, which are placed inside regions ... |
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| Image Processing and Computer Aided Diagnosis in Computed Tomography of the Breast |
MAR 2007 |
53 pages |
| Authors:
Jessie Q. Xia; Joseph Y. Lo; DUKE UNIV DURHAM NC
|
| Dedicated breast CT imaging is a promising technique for breast cancer imaging. Since it can totally remove the overlapping of tissues it will be even more beneficial for women with dense breasts. Still there is a lot to be done for advancing the breast CT technology. One direction of development is to improve the image quality via some post-acquisition processing techniques which is the goal of this project. Specifically two ... |
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| Inroads in the Non-Invasive Diagnostics of Ballistic Impact Damage |
NOV 2006 |
8 pages |
| Authors:
W. H. Green; N. L. Rupert; Joe M. Wells; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The non-invasive/non-destructive x-ray computed tomography (XCT) technique is a widely applicable and powerful inspection modality for evaluation and analysis of shock and/or impact damage in armor materials, including metallic armors and armor ceramics, as well as materials in general. It presently appears that the noninvasive damage diagnostic approach with XCT provides the only sufficiently effective nondestructive modality for high resolution ballistic impact damage interrogation, spatial characterization, quantification, visualization, and 3-D ... |
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| Non Destructive Characterization, Inspection, Failure Analysis of Advanced Components and Sensors With a High Resolution & High Contrast Microtomography (microCT) System |
NOV 2006 |
6 pages |
| Authors:
S. H. Lau; Hauyee Chang; Joanna Cheong; Frederick Duewer; Michael Feser; Andrei Tkachuk; Wenbing Yun; XRADIA INC CONCORD CA
|
| 3D X-ray microtomography (microCT) can non-destructively characterize, inspect and solve many failure analysis problems associated with the manufacture of advanced materials, components, finished products, sensors for the military and industry. Conventional microCTs however, have spatial resolution limitation (typically of the order of a few microns to tens of microns) and poor contrast with low Z (atomic number) materials. We describe the role of a novel high resolution and high contrast ... |
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| New Imaging Kit for Assessment of Estrogen Receptors with Single Photon Emission Computed Tomography |
SEP 2006 |
91 pages |
| Authors:
E. E. Kim; David J. Yang; Ali Azhdarinia; M D ANDERSON CANCER CENTER HOUSTON TX
|
| To evaluate the feasibility of using 99mTc-glutamate peptide-estradiol (GAP-EDL) in imaging estrogen receptor positive (ER +) diseases. Methods: 3-Aminoethyl estradiol (EDL) was conjugated glutamate peptide (GAP) to yield GAP-EDL. Cellular uptake studies of 99mTc-GAP-EDL were conducted in ER (+) cell lines (MCF7 13762 and T47D). To demonstrate whether GAP-EDL increases MAP kinase acbvafion Western blot analysis of GAP-EDL was performed in 13762 cells. Biodistribution was conducted in 13762 breast tumor-bearing ... |
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| Three Dimensional Reconstruction Algorithm for Imaging Pathophysiological Signals Within Breast Tissue Using Near Infrared Light |
JUL 2006 |
129 pages |
| Authors:
Hamid Dehghani; DARTMOUTH COLL HANOVER NH
|
| Near Infrared (NIR) tomography is an imaging technique that aims to image optical properties of biological tissue. This technique has been used to image and characterize breast tissue in healthy volunteers as well as detecting tumor in patients. Image reconstruction algorithms have been developed, which utilizes inherent wavelength dependant a-priori information (spectral) as well as concurrently measured MRI structural information (spatial) to show that the quantitative and qualitative accuracy is ... |
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| Characterization of the Ionosphere over the South Atlantic Ocean by Means of Ionospheric Tomography using Dual Frequency GPS Signals Received On Board a Research Ship |
JUN 2006 |
19 pages |
| Authors:
Pierre J. Cilliers; Cathryn N. Mitchell; Ben D. Opperman; HERMANUS MAGNETIC OBSERVATORY (SOUTH AFRICA)
|
| This paper reports a novel approach to extend the coverage of terrestrial ionospheric measurements over a poorly characterized region of the South Atlantic Ocean, including the South Atlantic Anomaly, by using dual frequency GPS signals received on board the South African polar research ship SA Agulhas. The routes of the SA Agulhas to the South Atlantic Islands, Gough (40 deg 17 sec S, 9 deg 58 sec W, Mag lat ... |
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| Computer Aided Detection of Breast Masses in Digital Tomosynthesis |
JUN 2006 |
20 pages |
| Authors:
Swatee Singh; Joseph Lo; DUKE UNIV DURHAM NC
|
| The objective of this study is to investigate if digital tomosynthesis can fundamentally improve sensitivity of detecting breast masses compared to conventional mammography. Overlapping dense tissue in mammography is one of the most common causes for unnecessary callbacks as well as missed cancers. By removing such overlapping tissue, breast tomosynthesis can obviate unnecessary callbacks as well as missed cancers. The goal is to provide 3D information at high resolution, comparable ... |
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| Image Processing and Computer Aided Diagnosis in Computed Tomography of the Breast |
MAR 2006 |
72 pages |
| Authors:
Jessie Q. Xia; DUKE UNIV DURHAM NC
|
| A novel breast cancer imaging technique -- dedicated cone-beam breast computerized tomography (CT) -- is currently under development. It is designed to deliver low-dose radiation to a patient while removing the superposition of breast tissues, which is a limiting factor of the conventional mammography technique. The new technique will particularly benefit women with dense breasts. The development of the breast CT imaging technique requires effective and efficient ways to reduce ... |
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| New Imaging Kit for Assessment of Estrogen Receptors with Single Photon Emission Computed Tomography |
MAR 2006 |
36 pages |
| Authors:
E. E. Kim; David J. Yang; Ali Azhdarinia; M D ANDERSON CANCER CENTER HOUSTON TX
|
| To evaluate the feasibility of using 99mTc-glutamate peptide-estradiol (GAP-EDL) in imaging estrogen receptor positive (ER +) diseases. Methods: 3-Aminoethyl estradiol (EDL) was conjugated glutamate peptide (GAP) to yield GAP-EDL. Cellular uptake studies of 99mTc-GAP-EDL were conducted in ER (+) cell lines (MCF7, 13762 and T47D). To demonstrate whether GAP-EDL increases MAP kinase activation, Western blot analysis of GAP-EDL was performed in 13762 cells. Biodistribution was conducted in 13762 breast tumor-bearing ... |
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| An Adjoint State Method for Three-Dimensional Transmission Traveltime Tomography Using First-Arrivals |
30 JAN 2006 |
23 pages |
| Authors:
Shingyu Leung; Jianliang Qian; CALIFORNIA UNIV LOS ANGELES DEPT OF MATHEMATICS
|
| Traditional transmission travel-time tomography hinges on ray tracing techniques. We propose a PDE-based Eulerian approach to travel-time tomography so that we can avoid the cumbersome ray-tracing. We start from the eikonal equation, define a mismatching functional and derive the gradient of the nonlinear functional by an adjoint state method. The resulting forward and adjoint problems can be efficiently solved by using the fast sweeping method; a limited memory BFGS method ... |
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| Quantifying Consolidation and Reordering in Natural Granular Media from Computed Tomography Images |
2006 |
10 pages |
| Authors:
Allen H. Reed; Karsten E. Thompson; Wenli Zhang; Clinton S. Willson; Kevin B. Briggs; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| Packing of granular media is an extremely important determinant in reservoir rock evolution, sound speed propagation, fluid flow and sediment compressibility. X-ray microfocus computed tomography (XMCT) images with high-resolution were evaluated using a grain-based algorithm that quantifies discrete components and bulk properties of sedimentary systems at different states of compaction or at approximately minimum and maximum packing densities. Angularity of these sands ranges from rounded to subrounded to subangular. Network ... |
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| Application of a New Grain-Based Reconstruction Algorithm to Microtomography Images, for Quantitative Characterization and Flow Modeling |
OCT 2005 |
12 pages |
| Authors:
Karsten E. Thompson; Clinton S. Willson; Christopher D. White; Stephanie Nyman; Janok Bhattacharya; Allen H. Reed; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| X-ray computed microtomography (XMT) is used for high-resolution, non-destructive imaging and has been applied successfully to geologic media. Despite the potential of XMT to aid in formation evaluation, currently it is used mostly as a research tool. One factor preventing more widespread application of XMT technology is limited accessibility to microtomography beamlines. Another factor is that computational tools for quantitative image analysis have not kept pace with the imaging technology ... |
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| Functional Measures of Sea Turtle Hearing |
SEP 2005 |
|
| Authors:
Darlene R. Ketten; Soraya M. Bartol; WOODS HOLE OCEANOGRAPHIC INST MA BIOLOGY DEPT
|
| Sea turtle hearing was investigated morphometrically by analyzing variations in auditory anatomy a and physiologically by brainstem evoked potential techniques. Auditory brainstem responses (ABRs) were collected from multiple species and life stages of live sea turtles using an stimulus coupled directly to the turtle's tympanum underwater. A three electrode array was used to record the evoked responses to stimuli. Anatomical data were obtained by computerized tomography (CT and MRI) and ... |
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| Quantification of Sediment Properties from Pore Structure and Grain Contacts: A Microcomputed Tomography Analysis of SAX04 Sands |
SEP 2005 |
9 pages |
| Authors:
A. H. Reed; K. E. Thompson; C. S. Willson; K. B. Briggs; M. D. Richardson; B. T. Hefner; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| During the Sediment Acoustic eXperiment (SAX04), sediment physical properties (e.g., porosity and permeability), determined by the arrangement of sand grains and the topology of the pore space, were evaluated in two ways: first, packing density in unconsolidated sand was adjusted from minimum to maximum density by vibration; and second, diver-collected cores were impregnated with polyester casting resin to maintain pore and grain morphologies. Sediment pore-morphology and grain data was captured ... |
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| New Approaches in SPECT Breast Imaging |
JUL 2005 |
24 pages |
| Authors:
Kelly E. Braun; R. Jaszczak; K. Bobkov; J. Bowsher; DUKE UNIV DURHAM NC
|
| The primary objective of this research is to develop new techniques in single photon emission computed tomography (SPECT) breast cancer imaging providing improved detection and characterization of early stage breast cancer. Projection data were acquired by implementing a tiltable SPECT system on a breast and torso phantom. The data were reconstructed with both an ordered subset expectation maximization (OSEM) algorithm and a filtered backprojection (FPP) algorithm with a ramp filter. ... |
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| Morphology of Gas Bubbles in Mud: A Microcomputed Tomographic Evaluation |
JUL 2005 |
9 pages |
| Authors:
Allen H. Reed; Bernard P. Boudreau; Chris Algar; Yoko Furukawa; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| Free gas in surficial sediments commonly forms gas bubbles that attenuate and dampen acoustic waves, influence slope stability, and contribute to greenhouse gas concentrations. Therefore, determining the mechanisms that control bubble shape, size, growth, and migration is important to acoustic sediment characterization and other disciplines. Previously, gas bubble shape, size, and distribution was quantified using "low-resolution" (~500 micron) medical computed tomography (CT). Recently, "high-resolution" (to 30 microns. In several MR ... |
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| Using CT to Image Storm-Generated Stratigraphy in Sandy Sediment Off Fort Walton Beach, Florida, USA |
JUL 2005 |
8 pages |
| Authors:
Kevin B. Briggs; Allen H. Reed; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| High-resolution measurements of X-ray attenuation with NRL's HD-500 microfocus Computed Tomography (CT) imager have been accomplished on 5.9cm-diameter diver-collected cores from an acoustic experiment conducted off Fort Walton Beach, Florida. The purpose of this imagery is ultimately to quantify sediment heterogeneity for modeling acoustic scattering. Cores, mainly consisting of medium quartz sand, were scanned with X-rays at 114-micrometer intervals downcore and the images were reconstructed to create a three-dimensional image ... |
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| Intensity Modulated Radiation Treatment of Prostate Cancer Guided by High Field MR Spectroscopic Imaging |
MAY 2005 |
186 pages |
| Authors:
Lei Xing; LELAND STANFORD JUNIOR UNIV STANFORD CA
|
| With the development of computer controlled multileaf collimators, IMRT now provides unprecedented means for us to deliver 3D-dose distributions with sub-centimeter resolution. Simultaneously, MRSI is capable of noninvasively providing critically needed 3D metabolic and physiological information. Together with anatomical CT/MRI, functional imaging affords valuable 4D data (3D structural plus 1D metabolic). A timely issue is how to integrate the metabolic/functional data into IMRT planning to improve clinical prostate cancer management. ... |
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| Tunable Snapshot Spectrometer Feasibility Study |
30 SEP 2004 |
139 pages |
| Authors:
Christopher P. Tebow; Eustace L. Dereniak; ARIZONA UNIV TUCSON
|
| A tunable snapshot imaging spectrometer has been demonstrated. A liquid crystal spatial light modulator (LC SLM) has been integrated into a computed tomographic imaging spectrometer (CTIS) to achieve tunability. The LC SLM allows for rapid, programmable, and non-mechanical alteration of its phase profile by the application of appropriate voltages to its transparent electrodes. The goal of this dissertation is twofold: (1) to integrate a liquid crystal spatial light modulator into ... |
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| Knowledge-Based 3D Segmentation and Reconstruction of Coronary Arteries Using CT Images |
SEP 2004 |
4 pages |
| Authors:
Yan Yang; Allen Tannenbaum; Don Giddens; GEORGIA INST OF TECH ATLANTA DEPT OF BIOMEDICAL ENGINEERING
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| An approach for the 3D segmentation and reconstruction of human left coronary arteries using angio-CT images is presented in this paper. Each voxel in the 3D dataset is assumed to belong to one of the three homogeneous regions: blood, myocardium, and lung. A priori knowledge of the regions is introduced via Bayes rule. Posterior probabilities obtained using Bayes rule are anisotropically smoothed, and the 3D segmentation is obtained via MAP ... |
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| Three Dimensional Reconstruction Algorithm for Imaging Pathophysiological Signal within Breast Tissue Using Near Infrared Light |
JUL 2004 |
56 pages |
| Authors:
Hamid Dehghani; DARTMOUTH COLL HANOVER NH
|
| Optical tomography is a non-invasive imaging technique that can image properties of biological tissue. Measurements of light propagation through tissue can be used to calculate and reconstruct images of internal optical properties. Since the absorption and scattering of light in the tissue is a function its physiological state, the aim is to calculate maps of physiological parameters, which can be early markers of tumor development. Specifically the aim is to ... |
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| Continuous and Discrete Inverse Conductivity Problems |
FEB 2004 |
27 pages |
| Authors:
Franklin Gavilanez; John Baras; Carlos Berenstein; MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH
|
| Tomography using CT scans and MRI scans is now well-known as a medical diagnostic tool which allows for detection of tumors and other abnormalities in a noninvasive way, providing very detailed images of the inside of the body using low dosage X-rays and magnetic fields. They have both also been used for determination of material defects in moderate size objects. In medical and other applications they complement conventional tomography. There ... |
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| Computerized Tomography of Projection Ultrasound |
SEP 2003 |
7 pages |
| Authors:
Chu-Chuan Liu; Yue Wang; CATHOLIC UNIV OF AMERICA WASHINGTON DC
|
| The second year of this training/research project focused on ultrasound tomography System simulation, integrating, and the tomography image reconstruction. A micro-Stepping motor has been purchased and integrated in the transmission ultrasound laboratory system (Imperium Acoustocam) and form a Transmission Ultrasound Computerized Tomography (TUCT) prototype system. The stepping motor is capable of rotating at a 1.8-degree per step with 200 steps per revolution up to a 1600 steps per revolution with ... |
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| The Prospective Army Coronary Calcium (PAAC) Study |
SEP 2003 |
9 pages |
| Authors:
Allen J. Taylor; SYSTEMS ASSESSMENT AND RESEARCH INC LANHAM MD
|
| Electron beam computed tomography (EBCT) is a noninvasive x-ray test like a CAT scan that detects calcium in the arteries of the heart. When calcium deposits are present, they indicate that some build-up of arterial blockages has begun in the arteries. The available evidence on EBCT shows that patients with calcium deposits are more likely to develop heart problems, such as heart attacks. There is controversy, however, because it is ... |
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| Nuclear Imaging for Assessment of Prostate Cancer Gene Therapy |
APR 2003 |
6 pages |
| Authors:
Dongfeng Pan; VIRGINIA UNIV CHARLOTTESVILLE
|
| Combination of the cytotoxic viral thymidine kinase (tk) and the prodrug, acyclovir (ACV) has been reported to inhibit the growth of the C4-2 tumor, a subline of LNCaP. However, it remains unsolved to non-invasively detect the in vivo distribution, expression and persistence of the toxic gene as well as to evaluate the therapeutic effect. In this project, we will develop a nuclear gene imaging approach to assist the cytotoxic gene ... |
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| Visible Spectrometer Measurements of the PAC III Intercept of Hera at WSMR on 31-Mar-2001 |
30 SEP 2002 |
5 pages |
| Authors:
Eustace L. Dereniak; James D. George Jr.; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| A snapshot imaging spectrometer known as the Computed Tomography Imaging Spectrometer (CTIS), operating at 15 frames per second, measured the PAC III intercept of a Hera at White Sands Missile Range (WSMR) on March 31, 2001. As in computed tomography, the collected data must be processed to produce the spectral images. A technical report describes the collection technique, the reconstruction techniques, and the resulting spectral images. A paper emphasizing the ... |
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| Magnetic Resonance-Conductivity Imaging Using 0.15 Tesla MRI Scanner |
25 OCT 2001 |
|
| Authors:
O. Birgul; O. Ozbek; B. M. Eyuboglu; Y. Z. Ider; MIDDLE EAST TECHNICAL UNIV ANKARA (TURKEY) DEPT OF ELECTRICAL AND ELECTRONICS ENGINEERING
|
| A novel imaging method for electrical impedance tomography is implemented. In this method, the magnetic flux density generated by current flowing in a 2D slice is measured using MRI scanner and recorded data is used to reconstruct relative conductivity images. The measurements are done from all parts of the imaging region, and therefore sensitivity is space independent. The magnetic flux density is extracted from phase images of the MRI image ... |
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| Segmentation and Estimation of the Histological Composition of the Tumor Mass in Computed Tomographic Images of Neuroblastoma |
25 OCT 2001 |
|
| Authors:
Fabio J. Ayres; Marcelo K. Zuffo; Rangaraj M. Rangayyan; Vicente O. Filho; Marcelo Valente; CALGARY UNIV (ALBERTA)
|
| The problem that we investigate in the present paper Is the improvement of the analysis of the primary tumor mass, in patients with advanced neuroblastoma, using X-ray computed tomography (CT) exams. To achieve this goal, we propose a methodology for the estimation of the histological content of the mass that comprises a technique for semi-automatic segmentation of the primary tumor mass in CT images of neuroblastoma and a statistical method ... |
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| Improvement of Image Quality in Transmission Computed Tomography Using Synchrotron Monochromatic X-Ray Sheet Beam |
25 OCT 2001 |
|
| Authors:
T. Yuasa; T. Takeda; T. Zeniya; Y. Hasegawa; K. Hyodo; YAMAGATA UNIV YONEZAWA (JAPAN)
|
| In the transmission CT imaging system with scintillator-CCD detector using synchrotron monochromatic x-ray as sheet beam, improvement of reconstructed image quality is investigated, The properties of experimental facilities cause the incident beam intensity to be spatially inhomogeneous, and to temporally attenuate, In order to achieve more reliable reconstruction, we propose the data-correction and estimation method based on the properties of the facilities and the principle of CT reconstruction, and confirm ... |
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| Resistivity Image Reconstruction Using J-Substitution Algorithm for MREIT |
25 OCT 2001 |
|
| Authors:
O. Kwon; J. K. Seo; E. J. Woo; J. R. Yoon; S. Y. Lee; YONSEI UNIV SEOUL (REPUBLIC OF KOREA) DEPT OF MATHEMATICS
|
| We describe a new resistivity image reconstruction algorithm called J-substitution algorithm. It utilizes internal current density data measured by MRI technique with current injection. Computer simulations show that Magnetic Resonance Electrical Impedance Tomography (MREIT) system using J- substitution algorithm can produce high-resolution static resistivity images of a subject. |
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| A Fractal Analysis of CT Liver Images for the Discrimination of Hepatic Lesions: A Comparative Study |
25 OCT 2001 |
|
| Authors:
C. P. Sariyanni; P. Asvestas; G. K. Matsopoulos; K. S. Nikita; A. S. Nikita; NATIONAL TECHNICAL UNIV ATHENS (GREECE) DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A quantitative study for the discrimination of different hepatic lesions is presented in this paper. The study is based on the fractal analysis of CT liver images in order to estimate their fractal dimension and to differentiate normal liver parenchyma from hepatocellular carcinoma. Four fractal dimension estimators have been implemented throughout this work; three well-established methods and a novel implementation of a method. Analytically, these methods correspond to the power ... |
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| Integration of CT/PET Images for the Optimization of Radiotherapy Planning |
25 OCT 2001 |
|
| Authors:
G. Rizzo; G. M. Cattaneo; I. Castiglioni; M. Reni; D. Vanni; MILAN UNIV (ITALY)
|
| A procedure is presented, based on the combined use of two different tomographic imaging modalities (PET and CT), aimed at the optimization of radiotherapy planning. The combined use of functional PET and anatomical CT studies allows a better definition of the tumor mass with respect to tile conventional CT based approach. The proposed procedure consists in: a) spatial registration of CT and PET studies; b) contour drawing based on the ... |
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| Assessment of an Optical Flow Field-Based Polyp Detector for CT colonography |
25 OCT 2001 |
|
| Authors:
B. Acar; C. F. Beaulieu; D. S. Paik; S. B. Goekturk; C. Tomasi; STANFORD UNIV PALO ALTO CA
|
| Most current computer-aided detection (CAD) algorithms for the fully automatic detection of colonic polyps from 3D CT data suffer from high false positive rates. We developed and evaluated a post-processing algorithm to decrease the false positive rate of such a method. Our method attempts to model the way a radiologist recognizes a polyp while scrolling a cross-sectional plane through 3D CT data by quantifying the change in location of the ... |
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| Medial Axis Registration of Supine and Prone CT Colonography Data |
25 OCT 2001 |
|
| Authors:
B. Acar; S. Napel; D. S. Paik; P. Li; J. Yee; STANFORD UNIV PALO ALTO CA
|
| Computed Tomographic Colonography (CTC) is a minimally invasive method that allows the examination of the colon wall from the source CT sections or in a virtual environment. The primary goal of CTC is the detection of colonic polyps. There are typically two data sets recorded in supine and prone positions. An important step in polyp detection is the anatomical registration of these datasets. We developed and experimentally validated a method ... |
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| Classification of Hepatic Lesions From CT Images Using Texture Features and Neural Networks |
25 OCT 2001 |
|
| Authors:
M. Gletsos; S. G. Mougiakakou; G. K. Matsopoulos; K. S. Nikita; D. Kelekis; NATIONAL TECHNICAL UNIV ATHENS (GREECE) DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In this paper a computer-aided diagnostic system for the classification of hepatic lesions from Computed Tomography (CT) images is presented. Regions of Interest (ROI's) taken from non-enhanced CT images of normal liver, hepatic cysts, hemangiomas, and hepatocellular carcinomas (a total of 147 samples), have been used as input to the system. The system consists of two levels: the feature extraction and the classification levels. The feature extraction level calculates the ... |
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| Formulation of Maximized Weighted Averages in URTURIP Technique |
25 OCT 2001 |
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| Authors:
Bruno Migeon; Philippe Deforge; Pierre Marche; ORLEANS UNIV BOURGES (FRANCE) LAB VISION ET ROBOTIQUE
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| The existing methods developed in URTURIP Technique (Ultrasound Reflection-mode Tomography Using Radial Image Processing) can be considered as a part of a reconstruction family called Maximized Weighted Averages Technique, and it is the object of this paper. It is shown that a reconstruction can be viewed as a filter and that the three commonly used methods can be rewritten with the same formulation. Moreover, interesting new methods can be developed ... |
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| Computed-Tomography Imaging SpectroPolarimeter (CTISP) - A Passive Optical Sensor. Volume 2. Appendix B |
SEP 2001 |
214 pages |
| Authors:
Hollis H. Bennett Jr.; Ricky A. Goodson; John O. Curtis; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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| An optical imaging system is described that simultaneously measures the wavelength dependence and polarization state dependence of light reflected from any surface. Potential applications of this technology include identifying man made objects from natural backgrounds, land cover classification, and a myriad of agricultural problems such as ground moisture measurements, estimation of crop health, etc. Polarization effects are quantified through the use of Stokes parameters. Both spatial and wavelength dependent data ... |
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| Computed-Tomography Imaging SpectroPolarimeter (CTISP) - A Passive Optical Sensor. Volume 1, Main Text and Appendix A; Volume 2, Appendix B |
SEP 2001 |
106 pages |
| Authors:
Hollis H. Bennett Jr.; Ricky A. Goodson; John O. Curtis; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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| An optical imaging system is described that simultaneously measures the wavelength dependence and polarization state dependence of light reflected from any surface. Potential applications of this technology include identifying man made objects from natural backgrounds, land cover classification, and a myriad of agricultural problems such as ground moisture measurements, estimation of crop health, etc. Polarization effects are quantified through the use of Stokes parameters. Both spatial and wavelength dependent data ... |
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| A Snapshot Imaging Spectropolarimeter |
AUG 2001 |
9 pages |
| Authors:
A. M. Locke; D. S. Sabatke; E. L. Dereniak; M. R. Descour; J. P. Garcia; D. Sass; S. Hoffman; J. White; R. Sampson; ARMY TANK-AUTOMOTIVE COMMAND WARREN MI
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| A revolutionary technique for snapshot imaging spectropolarimetry has been developed because of the recent availability of large focal plane arrays and fast computers. The technique involves the combination of spectropolarimetry with computed tomography imaging spectrometry (CTIS). This spectropolarimeter uses a modulation to encode the spectral dependence of all four Stokes parameters in a single spectrum. CTIS is a snapshot imaging spectrometry method in which both spatial and spectral information is ... |
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