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Imaging systems for biomedical applications. Final report

Description: Many of the activities of the human body manifest themselves by the presence of a very weak magnetic field outside the body, a field that is so weak that an ultra-sensitive magnetic sensor is needed for specific biomagnetic measurements. Superconducting QUantum Interference Devices (SQUIDs) are extremely sensitive detectors of magnetic flux and have been used extensively to detect the human magnetocardiogram, and magnetoencephalogram. and other biomagnetic signals. In order to utilize a SQUID a… more
Date: June 6, 1995
Creator: Radparvar, M.
Partner: UNT Libraries Government Documents Department
open access

Computer graphics for extracting information from data

Description: Computer graphics which are useful for displaying and analyzing data are presented. Many classical and several newly developed graphical techniques in statistical data analysis are presented for small univariate and multivariate data sets. These include histograms, empirical density functions, pie charts, contour plots, a discriminant analysis display, cluster analysis, Chernoff ''faces,'' Andrews' sine curves, three-dimensional plots, and probability plots. Recent advances in data collection t… more
Date: January 1, 1978
Creator: Lohrding, R. K.; Johnson, M. M. & Whiteman, D. E.
Partner: UNT Libraries Government Documents Department
open access

Fabrication of a Set of Realistic Torso Phantoms for Calibration of Transuranic Nuclide Lung Counting Facilities

Description: A set of 16 tissue equivalent torso phantoms has been fabricated for use by major laboratories involved in counting transuranic nuclides in the lung. These phantoms, which have bone equivalent plastic rib cages, duplicate the performance of the DOE Realistic Phantom set. The new phantoms (and their successors) provide the user laboratories with a highly realistic calibration tool. Moreover, use of these phantoms will allow participating laboratories to intercompare calibration information, both… more
Date: October 26, 1983
Creator: Griffith, R. V.; Anderson, A. L.; Sundbeck, C. W. & Alderson, S. W.
Partner: UNT Libraries Government Documents Department
open access

Survey of computer processing of chest radiographs

Description: This paper reviews the work of several investigators who have concerned themselves with various aspects of computer measurement and diagnosis of anatomy present in chest radiography. It is hoped that, at the very least, it will provide a reasonably complete annotated bibliography of this body of research.
Date: January 1, 1977
Creator: Kruger, R. P.
Partner: UNT Libraries Government Documents Department
open access

Contact Sensing Palm for the Salisbury Robot Hand

Description: This report summarizes work performed on Tasks 5 and 6 under Sandia Contract Number 75-2608. Task 5 involves the design and development of a palm for the Salisbury robot hand and Task 6 is an investigation and incorporation of contact sensors into the palm design. 19 refs., 8 figs., 1 tab.
Date: July 18, 1990
Creator: Brock, David L.
Partner: UNT Libraries Government Documents Department
open access

Secure stand alone positive personnel identity verification system (SSA-PPIV)

Description: The properties of a secure stand-alone positive personnel identity verification system are detailed. The system is designed to operate without the aid of a central computing facility and the verification function is performed in the absence of security personnel. Security is primarily achieved by means of data encryption on a magnetic stripe badge. Several operational configurations are discussed. Advantages and disadvantages of this system compared to a central computer driven system are detai… more
Date: March 1, 1979
Creator: Merillat, P.D.
Partner: UNT Libraries Government Documents Department
open access

Human thoracic anatomy relevant to implantable artificial hearts

Description: The objective of the study is to define the human thorax in a quantitative statistical manner such that the information will be useful to the designers of cardiac prostheses, both total replacement and assist devices. This report pertains specifically to anatomical parameters relevant to the total cardiac prosthesis. This information will also be clinically useful in that the proposed recipient of a cardiac prosthesis can by simple radiography be assured of an adequate fit with the prosthesis p… more
Date: October 1, 1976
Creator: Jacobs, G. B.; Kiraly, R. J. & Nose, Y.
Partner: UNT Libraries Government Documents Department
open access

New Developments in Ultrasonic Imaging of the Chest and Other Body Organs

Description: The ultrasonic imaging system described herein was developed to measure chest-wall thickness and the percentage of fat in the chest and around other body organs. The system uses pulse-echo techniques to transmit and detect sound waves reflected from the interfaces of body organs and adjacent tissue. A computer draws these interfaces on color scans, and a code is used to exponentially average data from several points on each scan to find the average thicknesses of the chest wall and fat layers. … more
Date: April 27, 1978
Creator: Campbell, G. W. & Anderson, A. L.
Partner: UNT Libraries Government Documents Department
open access

Quantitative Luminescence Imaging System

Description: The goal of the MEASUREMENT OF CHEMILUMINESCENCE project is to develop and deliver a suite of imaging radiometric instruments for measuring spatial distributions of chemiluminescence. Envisioned deliverables include instruments working at the microscopic, macroscopic, and life-sized scales. Both laboratory and field portable instruments are envisioned. The project also includes development of phantoms as enclosures for the diazoluminomelanin (DALM) chemiluminescent chemistry. A suite of either … more
Date: December 31, 1992
Creator: Batishko, C. R.; Stahl, K. A. & Fecht, B. A.
Partner: UNT Libraries Government Documents Department
open access

Determination of photon conversion factors relating exposure and dose for several extremity phantom designs

Description: This report presents the results of measurements of dosimetric properties of simple extremity phantoms suitable for use in extremity dosimeter performance testing. Two sizes of phantoms were used in this study. One size represented the forearm or lower leg and the other size represented the finger or toe. For both phantom sizes, measurements were performed on solid plastic phantoms and on phantoms containing simulated bone material to determine the effect of backscattered radiations from the bo… more
Date: September 1, 1986
Creator: Roberson, P. L.; Eichner, F. N. & Reece, W. D.
Partner: UNT Libraries Government Documents Department
open access

Tissue-Equivalent Torso Phantom for Calibration of Transuranic-Nuclide Counting Facilities

Description: Several tissue-equivalent human-torso phantoms have been constructed for the calibration of counting systems used for in-vivo measurement of transuranic radionuclides. The phantoms contain a simulated human rib cage (in some cases, real bone) and removable model organs, and they include tissue-equivalent chest plates that can be placed over the torso to simulate people with a wide range of statures. The organs included are the lungs, liver, and tracheobronchial lymph nodes. Polyurethane with va… more
Date: January 16, 1986
Creator: Griffith, R. V.; Anderson, A. L.; Dean, P. N.; Fisher, J. C. & Sundbeck, C. W.
Partner: UNT Libraries Government Documents Department
open access

Ergonomic assessments of three Idaho National Engineering Laboratory cafeterias

Description: The Idaho National Engineering Laboratory is a Department of Energy facility that performs a variety of engineering and research projects. EG G Idaho is the prime contractor for the laboratory and, as such, performs the support functions in addition to technical, research, and development functions. As a part of the EG G Idaho Industrial Hygiene Initiative, ergonomic assessments were conducted at three Idaho National Engineering Laboratory Cafeterias. The purposes of the assessments were to det… more
Date: January 1, 1993
Creator: Ostrom, L. T.; Romero, H. A.; Gilbert, B. G. & Wilhelmsen, C. A.
Partner: UNT Libraries Government Documents Department
open access

Transient visual evoked neuromagnetic responses: Identification of multiple sources

Description: Neuromagnetic measurements and associated modeling procedures must be able to resolve multiple sources in order to localize and accurately characterize the generators of visual evoked neuromagnetic activity. Workers have identified at least 11 areas in the macaque, throughout occipital, parietal, and temporal cortex, which are primarily or entirely visual in function. The surface area of the human occipital lobe is estimated to be 150--250cm. Primary visual cortex covers approximately 26cm/sup … more
Date: January 1, 1989
Creator: Aine, C.; George, J.; Medvick, P.; Flynn, E.; Bodis-Wollner, I. & Supek, S.
Partner: UNT Libraries Government Documents Department
open access

Mechanism of activation of light-activated phosphodiesterase and evidence for homology with hormone-activated adenylate cyclase

Description: Light-activated cGMP phosphodiesterase (PDE) is one of the effector proteins in the rod outer segments in vertebrate retina. The hydrolysis of cGMP in rod occurs with a speed and light sensitivity which suggests a role for this hydrolysis in visual transduction. In fact, there is electrophysiological data which supports the possibility that cGMP could regulate rod membrane voltage. PDE shows very rapid activation in the presence of photons and GTP. We have called attention to the intriguing ana… more
Date: January 1, 1983
Creator: Bitensky, M. W.; Yamazaki, A.; Wheeler, M. A.; George, J. S. & Rasenick, M. M.
Partner: UNT Libraries Government Documents Department
open access

Extremity dosimetry at US Department of Energy facilities

Description: A questionnaire on extremity dosimetry was distributed to DOE facilities along with a questionnaire on beta dosimetry. An informal telephone survey was conducted as a follow-up survey to answer a few additional questions concerning extremity monitoring practices. The responses to the questionnaire and the telephone survey are summarized in this report. Background information, developed from operational experience and a review of the current literature, is presented as a basis for understanding … more
Date: May 1, 1986
Creator: Harty, R.; Reece, W.D. & MacLellan, J.A.
Partner: UNT Libraries Government Documents Department
open access

Effects of Spatial Attention on the Visual-Evoked Neuromagnetic Response

Description: A number of studies have shown that selective attention to spatial location modulates the amplitudes of several visual evoked potential components recorded from posterior regions of the head (e.g., Eason, Harter White, 1969; Harter, Aine, Schroeder, 1982; Hillyard Munte, 1984; Mangun Hillyard, 1988). The early components, P1 and N1 (peak latencies: 90--135 and 140--170 msec, respectively), are thought to arise in one or more areas of visual cortex. Although it is generally assumed that such ERP… more
Date: January 1, 1989
Creator: Aine, C. J.; George, J. S.; Oakley, M. T.; Medvick, P. A. & Flynn, E. R.
Partner: UNT Libraries Government Documents Department
open access

1963 revisited: should we set a precedent of recalculating old exposures

Description: This paper describes recent experience in re-evaluating the dose to an employee. This employee was plagued with skin disorders for years, but he questioned his recorded beta dose only after a recent LLNL cancer study began collecting data. He was concerned that his radiation dose recorded during the time he worked on a fission burst reactor experiment in 1963 did not represent the actual dose he received. About six months were spent gathering information, putting the information together, makin… more
Date: October 26, 1981
Creator: Hoots, S.S.
Partner: UNT Libraries Government Documents Department
open access

Multipolar corneal-shaping electrode

Description: The disclosure relates to a multipolar probe using radiofrequency energy to reshape the cornea of an eye. The surface of the cornea is flushed continuously with a conductive coolant during operation.
Date: April 30, 1981
Creator: Doss, J.D.
Partner: UNT Libraries Government Documents Department
open access

Surface contouring with a range finder

Description: New patients at the Neutron Therapy Facility must be contoured so that the staff might offer safe and effective treatment. A new system using the lasers and rotating chair that are in the treatment room, a range finder that projects a scale, a contour board marked with polar coordinates, and a swing scale has been implemented. This system significantly improves the accuracy of the contours drawn and should prove to be a time saver in difficult contours, such as those found about the head. Patie… more
Date: August 1, 1986
Creator: Todd, T.J. & Lennox, A.
Partner: UNT Libraries Government Documents Department
open access

Anatomy studies for an artificial heart. Final summary report

Description: In the interval from February of 1972 through December of 1977, studies were conducted relating to the anatomical feasibility of implanting a total artificial heart system. These studies included both the calf as an experimental animal as well as the ultimate human recipient of the artificial heart system. Studies with the calf included definition of the thoracic anatomy relative to the size, shape, and vascular connections for implanting the blood pump. To test the animal's tolerance to an imp… more
Date: December 1, 1977
Creator: Kiraly, Raymond J. & Nose, Yukihiko
Partner: UNT Libraries Government Documents Department
open access

The GTP binding protein-dependent activation and deactivation of cGMP phosphodiesterase in rod photoreceptors

Description: Cyclic GMP (cGMP) has a crucial role in visual transduction. Recent electrophysiological studies clearly indicate the existence of cGMP-activated conductance in photoreceptor plasma membranes. In darkness, Na{sup +}, Ca{sup ++}, and Mg{sup ++} enter rod outer segments (ROS) through cGMP-activated channels while light closes channels by lowering cGMP concentrations through activation of cGMP phosphodiesterase (PDE). Many excellent reviews reference the mechanism of PDE activation in photorecepto… more
Date: January 1, 1989
Creator: Yamazaki, Akio.
Partner: UNT Libraries Government Documents Department
open access

Manipulators in teleoperation

Description: Teleoperated manipulators represent a mature technology which has evolved over nearly 40 years of applications experience. The wide range of manipulator concepts developed thus far reflect differing applications, priorities, and philosophies. The technology of teleoperated manipulators is in a rapid state of change (just as are industrial robotics) fueled by microelectronics and materials advances. Large strides in performance and dexterity are now practical and advantageous. Even though improv… more
Date: January 1, 1985
Creator: Hamel, W.R.
Partner: UNT Libraries Government Documents Department
open access

The FBI wavelet/scalar quantization standard for gray-scale fingerprint image compression

Description: The FBI has recently adopted a standard for the compression of digitized 8-bit gray-scale fingerprint images. The standard is based on scalar quantization of a 64-subband discrete wavelet transform decomposition of the images, followed by Huffman coding. Novel features of the algorithm include the use of symmetric boundary conditions for transforming finite-length signals and a subband decomposition tailored for fingerprint images scanned at 500 dpi. The standard is intended for use in conjunct… more
Date: January 1, 1993
Creator: Bradley, J.N.; Brislawn, C.M. (Los Alamos National Lab., NM (United States)) & Hopper, T. (Federal Bureau of Investigation, Washington, DC (United States))
Partner: UNT Libraries Government Documents Department
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