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You searched on: Author: zachary levine

Displaying records 21 to 30 of 117 records.
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21. Phantoms and the Problem of Quantification in Medical Computed Tomography (CT)
Published: 6/15/2010
Author: Zachary H Levine
Abstract: Medical CT may be made more useful by increasing the quantification. Phantoms have shown that volumetric analysis may be ten times more precise than the standard RECIST metric. Phantoms have a big role to play defining uncertainty and providing co ...

22. RECIST vs. Volume Measurement in Medical CT Using Ellipsoids of Known Size
Published: 4/12/2010
Authors: Zachary H Levine, Bruce R. Borchardt, Nolan J Brandenburg, Charles W Clark, Balasubramanian Muralikrishnan, Craig M Shakarji, Joseph J. Chen, Eliot L. Siegel
Abstract: (a) Purpose: We wanted to test the extent to which two common methods of determining the sizes of tumors would perform when compared to a statistically significant number of well-characterized reference objects. The size of the objects was chosen to ...

23. Heralded, pure-state single-photon source based on a Potassium Titanyl Phosphate waveguide
Published: 2/15/2010
Authors: Zachary H Levine, Jingyun Fan, Jun Chen, Alexander E. Ling, Alan L Migdall
Abstract: WWe analyze the generation of single spatial mode, spectrally uncorrelated photon pairs via type II spontaneous parametric downconversion in a Potassium Titanyl Phosphate (KTP) waveguide using real experimental parameters. We show that this source ...

24. Design considerations for a cascaded grating interferometer suitable for EUV interference lithography
Published: 4/10/2009
Authors: Zachary H Levine, Thomas B Lucatorto, Steven E Grantham
Abstract: The potential of a cascaded grating interferometer to perform Extreme Ultraviolet Interference Lithography (EUV-IL) depends on its beng coupled to a source that is bright enought to allow exposures ina reasonable time.   This work presents a ...

25. A Low-Cost Density Reference Phantom for Computed Tomography
Published: 1/2/2009
Authors: Zachary H Levine, Ming-Dong Li, Anthony P Reeves, David F Yankelevitz, Joseph J Chen, Eliot L Siegel, Adele P Peskin, Diana N. Zeiger
Abstract: We have characterized a commercially-available polyurethane foam which is marketed for modeling parts in the aircraft, automotive, and related industries. We find that the foam may be suitable for use as a density reference standard in the range bel ...

26. A Low Cost Fiducial Reference for Computed Tomography
Published: 11/11/2008
Authors: Zachary H Levine, Steven E Grantham, Daniel S Sawyer, Anthony P Reeves, David F Yankelevitz
Abstract: Rationale and Objectives. To detect the growth in lesions, it is necessary to ensure that the apparent changes in size are above the noise floor of the system. By introducing a fiducial reference, it may be possible to detect smaller changes in le ...

27. Diffraction and Electron Energy Loss to Plasmons in Silicon Slabs
Published: 3/10/2008
Author: Zachary H Levine
Abstract: Dynamic diffraction patterns have been calculated for 25-nm thick slabs of silicon with [001], [111], and [110] faces for a 120 keV electron beam. The calculation used the mixed dynamical form factor in the dielectric formulation. Dielectric matric ...

28. The Magic Angle Mystery in Electron Energy Loss Spectra: Relativistic and Dielectric Corrections
Published: 1/2/2008
Authors: A P Sorini, J J Rehr, Zachary H Levine
Abstract: Recently it has been demonstrated that a careful treatment of both longitudinal and transverse matrix elements in electron energy loss spectra can explain the mystery of relativistic effects on the magic angle. Here we show that there is an addition ...

29. Controlling the Band Gap in Zigzag Graphene Nanoribbons With an Electric Field Induced by a Polar Molecule
Published: 1/1/2008
Authors: Sergio Dalosto, Zachary H Levine
Abstract: Graphene nanoribbons with both armchair- and zigzag-shaped hydrogen-passivated edges (AGNR and ZGNR) have band gaps. Son et al. showed that the gap s value depends on the width of the ribbon and that the application of a uniform external electric fi ...

30. Optical to UV spectra and birefringence of SiO2 and TiO2:  first-principles calculations with excitonic effects
Published: 1/1/2008
Authors: H M Lawler, J J Rehr, F Vila, SD Dalosto, Eric L Shirley, Zachary H Levine
Abstract: A first-principles approach is presented for calculations of optical to ultraviolet spectra including excitonic effects.  The approach is based on the Bethe-Salpeter equation calculations using the NBSE code combined with ABINIT.  The appro ...

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