Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Christopher Allen Nafis"'
Autor:
Jason McKenzie, J. Eric Tkaczyk, Christopher Allen Nafis, Henry Chen, Glenn Bindley, Yi Liao, Tan Zhang, Yanfeng Du, Gil Abramovich
Publikováno v:
2011 IEEE Nuclear Science Symposium Conference Record.
The impact of Te inclusion on CZT detector spectral response is studied using IR defect mapping and depth-sensitive performance measurement. For high quality CZT device structures with low Te inclusion density, the presence or absence of Te inclusion
Autor:
Yi Liao, J. Eric Tkaczyk, Christopher Allen Nafis, Amer Butt, Joseph Czechowski, Kevin George Harding, Gil Abramovich, Esmaeil Heidari
Publikováno v:
SPIE Proceedings.
In this paper, the design and evaluation of a 3D stereo, near infrared (IR), defect mapping system for CZT inspection is described. This system provides rapid acquisition and data analysis that result in detailed mapping of CZT crystal defects across
Autor:
Wenwu Zhang, Gil Abramovich, Kristian W. Andreini, Tan Zhang, J. Eric Tkaczyk, Christopher Allen Nafis, Kevin George Harding, Yana Z. Williams
Publikováno v:
SPIE Proceedings.
Current spectroscopic detector crystals contain defects that prevent economic production of devices with sufficient energy resolution and stopping power for radioisotope discrimination. This is especially acute for large monolithic crystals due to in
Autor:
Eric R. Tkaczyk, Glenn Bindley, Christopher Allen Nafis, Henry Chen, Kristian W. Andreini, Yana Z. Williams, Gil Abramovich, Kevin George Harding
Publikováno v:
SPIE Proceedings.
CdZnTe is a high efficiency, room temperature radiation detection material that has attracted great interesting in medical and security applications. CZT crystals can be grown by various methods. Particularly, CZT grown with the Transfer Heater Metho
Autor:
Swaminathan Manickam, Joseph Czechowski, Christopher Allen Nafis, Vijay Krishna Paruchuru, Arun Vemury, Kevin George Harding, Robert William Tait, Gil Abramovich
Publikováno v:
SPIE Proceedings.
In some applications such as field stations, disaster situations or similar conditions, it is desirable to have a contactless, rugged means to collect fingerprint information. The approach described in this paper enables acceleration of the capture p
Autor:
Eric R. Tkaczyk, Yana Z. Williams, Gil Abramovich, Kevin George Harding, Christopher Allen Nafis
Publikováno v:
SPIE Proceedings.
The fabrication of new optical materials has many challenges that suggest the need for new metrology tools. To this purpose, the authors designed a system for localizing 10 micron embedded defects in a 10-millimeter thick semitransparent medium. The
Autor:
Swaminathan Manickam, Vijay Krishna Paruchuru, Arun Vemury, Gil Abramovich, Christopher Allen Nafis, Kevin George Harding, Joseph Czechowski
Publikováno v:
SPIE Proceedings.
This paper describes a real time, low cost part metrology method for capturing and extracting 3D part data using a single camera and no moving elements. 3D capture in machine vision is typically done using stereo photogrammetry, phase shifting using
Publikováno v:
Medical Imaging: Image-Guided Procedures
Electromagnetic (EM) tracking systems have been successfully used for Surgical Navigation in ENT, cranial, and spine applications for several years. Catheter sized micro EM sensors have also been used in tightly controlled cardiac mapping and pulmona
Publikováno v:
Medical Imaging: Image-Guided Procedures
Optical tracking systems have been used for several years in image guided medical procedures. Vendors often state static accuracies of a single retro-reflective sphere or LED. Expensive coordinate measurement machines (CMM) are used to validate the p
Autor:
William E. Lorensen, L. Gleason, Christopher Allen Nafis, Harvey E. Cline, D. Altobelli, Ron Kikinis
Publikováno v:
IEEE Visualization
Three dimensional computer models of the anatomy generated from volume acquisitions of computed tomography and magnetic resonance imaging are useful adjuncts to 2D images. This paper describes a system that merges the computer generated 3D models wit