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  • 1
    Publication Date: 2011-08-24
    Description: Myocardial perfusion imaging has long been a goal for the non-invasive echocardiographic assessment of the heart. However, many factors at play in perfusion imaging have made this goal elusive. Harmonic imaging and triggered imaging with newer contrast agents have made myocardial perfusion imaging potentially practical in the very near future. The application of indicator dilution theory to the coronary circulation and bubble contrast agents is fraught with complexities and sources of error. Therefore, quantification of myocardial perfusion by non-invasive echocardiographic imaging requires further investigation in order to make this technique clinically viable.
    Keywords: Life Sciences (General)
    Type: Coronary artery disease (ISSN 0954-6928); Volume 11; 3; 221-6
    Format: text
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  • 2
    Publication Date: 2011-08-24
    Description: Harmonic imaging is a new ultrasonographic technique that is designed to improve image quality by exploiting the spontaneous generation of higher frequencies as ultrasound propagates through tissue. We studied 51 difficult-to-image patients with blinded side-by-side cineloop evaluation of endocardial border definition by harmonic versus fundamental imaging. In addition, quantitative intensities from cavity versus wall were compared for harmonic versus fundamental imaging. Harmonic imaging improved left ventricular endocardial border delineation over fundamental imaging (superior: harmonic = 71.1%, fundamental = 18.7%; similar: 10.2%; P 〈.001). Quantitative analysis of 100 wall/cavity combinations demonstrated brighter wall segments and more strikingly darker cavities during harmonic imaging (cavity intensity on a 0 to 255 scale: fundamental = 15.6 +/- 8.6; harmonic = 6.0 +/- 5.3; P 〈.0001), which led to enhanced contrast between the wall and cavity (1.89 versus 1.19, P 〈.0001). Harmonic imaging reduces side-lobe artifacts, resulting in a darker cavity and brighter walls, thereby improving image contrast and endocardial delineation.
    Keywords: Life Sciences (General)
    Type: Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography (ISSN 0894-7317); Volume 13; 11; 1012-8
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  • 3
    Publication Date: 2011-08-24
    Description: When left ventricular outflow tract obstruction develops after aortic valve replacement, few treatment choices have been available until now. We present a patient with prior aortic valve replacement who developed left ventricle outflow tract obstruction that was successfully treated with a percutaneous transcoronary myocardial septal alcohol ablation. This technique is a useful tool for the treatment of obstructive hypertrophic cardiomyopathy, especially in those patients with prior heart surgery. Copyright 2001 Wiley-Liss, Inc.
    Keywords: Life Sciences (General)
    Type: Catheterization and cardiovascular interventions : official journal of the Society for Cardiac Angiography & Interventions (ISSN 1522-1946); Volume 53; 4; 524-6
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  • 4
    Publication Date: 2006-10-26
    Description: Breadboard model of spaceborne synchronous clock pulse generator for spinning spacecraft
    Keywords: ELECTRONIC EQUIPMENT
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  • 5
    Publication Date: 2011-08-16
    Description: This paper presents the results obtained in a continuing investigation of fault-tolerant computing which is being conducted at the Jet Propulsion Laboratory. Initial studies led to the decision to design and construct an experimental computer with dynamic (standby) redundancy, including replaceable subsystems and a program rollback provision to eliminate transient errors. This system, called the STAR computer, began operation in 1969. The following aspects of the STAR system are described: architecture, reliability analysis, software, automatic maintenance of peripheral systems, and adaptation to serve as the central computer of an outer-planet exploration spacecraft.
    Keywords: COMPUTERS
    Type: IEEE Transactions on Computers; C-20; Nov. 197
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  • 6
    Publication Date: 2011-08-16
    Description: Room temperature cholesteric liquid crystals retention of information on past electric field excitation by changes in optical transmission properties
    Keywords: PHYSICS, SOLID-STATE
    Type: ; ADEMIE DES SCIENCES
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  • 7
    Publication Date: 2014-11-22
    Description: The Rocknest aeolian deposit is similar to aeolian features analyzed by the Mars Exploration Rovers (MER) Spirit and Opportunity. The fraction of sand 〈150 micron in size contains approx. 55% crystalline material consistent with a basaltic heritage, and approx. 45% X-ray amorphous material. The amorphous component of Rocknest is Fe-rich and Si-poor, and is the host of the volatiles (H2O, O2, SO2, CO2, and Cl) detected by the Surface Analysis at Mars (SAM) instrument and of the fine-grained nanophase oxide (npOx) component first described from basaltic soils analyzed by MER. The similarity between soils and aeolian materials analyzed at Gusev crater, Meridiani Planum and Gale crater implies locally sourced, globally similar basaltic materials, or globally and regionally sourced basaltic components deposited locally at all three locations.
    Keywords: Lunar and Planetary Science and Exploration
    Type: ARC-E-DAA-TN11260
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  • 8
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    In:  CASI
    Publication Date: 2019-05-11
    Description: This device for simplifying the plotting of a Veitch diagram consists of several overlays for blocking out the unwanted squares. This method of plotting the various input combinations to a computer is used in conjunction with the Boolean functions.
    Keywords: MECHANICS
    Type: JPL-385
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  • 9
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    In:  Other Sources
    Publication Date: 2019-06-28
    Description: PLOTPAK is complete general purpose plotting and contouring package. Flexible and easy-to-use system, it produces line-printer, television-screen, and DICOMED plots. Plots, from quick and simple to complex and sophisticated, can be generated with only basic knowledge of FORTRAN and PLOTPAK commands.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: GSC-12367 , NASA Tech Briefs (ISSN 0145-319X); 4; 4; P. 584
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  • 10
    Publication Date: 2019-07-19
    Description: Future exploration missions will be the first time humanity travels beyond Low Earth Orbit (LEO) since the Apollo program, taking us to cis-lunar space, interplanetary space, and Mars. These long-duration missions will cover vast distances, severely constraining opportunities for emergency evacuation to Earth and cargo resupply opportunities. Communication delays and blackouts between the crew and Mission Control will eliminate reliable, real-time telemedicine consultations. As a result, compared to current LEO operations onboard the International Space Station, exploration mission medical care requires an integrated medical system that provides additional in-situ capabilities and a significant increase in crew autonomy. The Medical System Concept of Operations for Mars Exploration Missions illustrates how a future NASA Mars program could ensure appropriate medical care for the crew of this highly autonomous mission. This Concept of Operations document, when complete, will document all mission phases through a series of mission use case scenarios that illustrate required medical capabilities, enabling the NASA Human Research Program (HRP) Exploration Medical Capability (ExMC) Element to plan, design, and prototype an integrated medical system to support human exploration to Mars.
    Keywords: Aerospace Medicine
    Type: JSC-CN-37894 , Human Research Program Investigators'' Workshop (HRP IWS 2017 ); Jan 23, 2017 - Jan 26, 2017; Galveston, TX; United States
    Format: application/pdf
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