Kooperativer Bibliotheksverbund

Berlin Brandenburg

and
and

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Conference Proceeding  (6)
Type of Medium
  • Conference Proceeding  (6)
Language
Year
  • 1
    Language: English
    In: 20 March 2015, Vol.9414, pp.94141B-94141B-10
    Description: The common practice for biopsy guidance is through transrectal ultrasound, with the fusion of ultrasound and MRI-based targets when available. However, ultrasound is only used as a guidance modality in MR-targeted ultrasound-guided biopsy, even though previous work has shown the potential utility of ultrasound, particularly ultrasound vibro-elastography, as a tissue typing approach. We argue that multiparametric ultrasound, which includes B-mode and vibro-elastography images, could contain information that is not captured using multiparametric MRI (mpMRI) and therefore play a role in refining the biopsy and treatment strategies. In this work, we combine mpMRI with multiparametric ultrasound features from registered tissue areas to examine the potential improvement in cancer detection. All the images were acquired prior to radical prostatectomy and cancer detection was validated based on 36 whole mount histology slides. We calculated a set of 24 texture features from vibro-elastography and B-mode images, and five features from mpMRI. Then we used recursive feature elimination (RFE) and sparse regression through LASSO to find an optimal set of features to be used for tissue classification. We show that the set of these selected features increases the area under ROC curve from 0.87 with mpMRI alone to 0.94 with the selected mpMRI and multiparametric ultrasound features, when used with support vector machine classification on features extracted from peripheral zone. For features extracted from the whole-gland, the area under the curve was 0.75 and 0.82 for mpMRI and mpMRI along with ultrasound, respectively. These preliminary results provide evidence that ultrasound and ultrasound vibro-elastography could be used as modalities for improved cancer detection in combination with MRI.
    ISBN: 9781628415049
    ISBN: 1628415045
    ISSN: 16057422
    Source: SPIE Digital Library - Proceedings
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Language: English
    In: 2016 IEEE Nanotechnology Materials and Devices Conference (NMDC), October 2016, pp.1-2
    Description: We investigate second harmonic generation from orthogonal plasmonic gold dimer antennas over the transition from capacitive to conductive coupling. By tuning both the gap and antenna length, the bonding and anti-bonding resonances are separately addressed. Results are compared to microscopic numerical simulations of the nonlinear response from the surface. A good agreement with experimental results for both, the intensity and the farfield polarization state of second harmonic light is achieved, confirming a χ〈sub〉⊥⊥⊥〈/sub〉〈sup〉(2)〈/sup〉-induced nonlinear response in agreement with literature. Extensive numerical simulations for the other possible surface-contributions to second harmonic generation ultimately confirm this observation. Our results demonstrate furthermore the strong impact of nanoscopic defects on the nonlinear optical emission under certain circumstances. On the other hand, we show that they can have a barely detectable influence just as well, depending on the interplay between symmetry at macroscopic and microscopic levels.
    Keywords: Aerospace ; Bioengineering ; Components, Circuits, Devices and Systems ; Engineered Materials, Dielectrics and Plasmas ; Fields, Waves and Electromagnetics ; Photonics and Electrooptics ; Power, Energy and Industry Applications;
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Language: English
    In: 18 July 2016, Vol.9905, pp.99051H-99051H-16
    Description: During 2014 and 2015, NASA's Neutron star Interior Composition Explorer (NICER) mission proceeded success- fully through Phase C, Design and Development. An X-ray (0.2-12 keV) astrophysics payload destined for the International Space Station, NICER is manifested for launch in early 2017 on the Commercial Resupply Services SpaceX-11 flight. Its scientific objectives are to investigate the internal structure, dynamics, and energetics of neutron stars, the densest objects in the universe. During Phase C, flight components including optics, detectors, the optical bench, pointing actuators, electronics, and others were subjected to environmental testing and integrated to form the flight payload. A custom-built facility was used to co-align and integrate the X-ray "con- centrator" optics and silicon-drift detectors. Ground calibration provided robust performance measures of the optical (at NASA's Goddard Space Flight Center) and detector (at the Massachusetts Institute of Technology) subsystems, while comprehensive functional tests prior to payload-level environmental testing met all instrument performance requirements. We describe here the implementation of NICER's major subsystems, summarize their performance and calibration, and outline the component-level testing that was successfully applied.
    Keywords: Engineering
    ISBN: 9781510601895
    ISBN: 1510601899
    ISSN: 0277786X
    E-ISSN: 1996756X
    Source: SPIE Digital Library - Proceedings
    Source: SPIE Digital Library - Journals
    Source: SPIE Digital Library - eBooks
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Language: English
    In: Proceedings of SPIE, 07 September 2001, Vol.4375(1)
    Description: The Sapphire Statistical Characterization and Risk Reduction Program tested 1400 4-point flexure bars with different crystal orientations at different temperatures to establish a mechanical strength database for engineering design. Sapphire coupons were selected to represent surfaces on two different missile windows and a missile dome. Sapphire was obtained from the same suppliers used for the windows or dome and, as much as possible, coupons were fabricated in the same manner as the corresponding part of the window or dome. For one missile window, sapphire from one fabricator was 50% stronger than sapphire made to the same specifications from the same blanks by another fabricator. In laser thermal shock tests, sapphire performed better than predicted from flexure tests. Of several nondestructive methods evaluated for their ability to identify mechanically weak specimens, only x-ray topography was correlated with strength for a limited set of specimens.
    Keywords: Engineering
    ISBN: 9780819440709
    ISSN: 0277-786X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Language: English
    In: Proceedings of SPIE, 07 September 2001, Vol.4375(1)
    Description: Neutron irradiation of sapphire with 1 x 10 neutrons(〈EQ MeV)/m increases the c-axis compressive strength by a factor of 3 at 600 degree(s)C. The mechanism of strength enhancement is the retardation of r-plane twin propagation by radiation-induced defects. B and Cd shielding was employed during irradiation to filter our thermal neutrons (〈EQ1 eV), thereby reducing residual radioactivity in the sapphire to background levels in a month. Yellow-brown irradiated sapphire is nearly decolorized to pale yellow by annealing at 600 degree(s)C with no loss of mechanical strength. Annealing at sufficiently high temperature (such as 1200 degree(s)C for 24 h) reduces the compressive strength back to its baseline value. Neutron irradiation decreases the flexure strength of sapphire at 600 degree(s)C by 0-20% in some experiments. However, the c- plane ring-on-ring flexure strength at 600 degree(s)C is doubled by irradiation. Elastic constants of irradiated sapphire are only slightly changed by irradiation. Infrared absorption and emission and thermal conductivity of sapphire are not affected by irradiation at the neutron fluence used in this study. Defects that might be correlated with strengthening were characterized by electron paramagnetic resonance spectroscopy. Color centers observed in the ultraviolet absorption spectrum were not clearly correlated with mechanical response. No radiation-induced changes could be detected by x-ray topography or x-ray diffraction.
    Keywords: Engineering
    ISBN: 9780819440709
    ISSN: 0277-786X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Language: English
    In: Proceedings of SPIE, 22 May 1997, Vol.3035(1), pp.380-388
    Description: The authors have been operating an ultrasound miniPACS for approximately two years. In the last six months, the system was more than doubled in size with inclusion of a teleradiology component and connection to PACS hardware from other vendors. This paper presents the engineering, operational, and clinical challenges posed by this integration and the logistical and systems approaches to meeting those challenges.
    Keywords: Engineering
    ISBN: 9780819424464
    ISSN: 0277-786X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages