Elan Scheinman - Academia.edu (original) (raw)
Papers by Elan Scheinman
Selon une variante, l'invention concerne un systeme de balayage de tomographie par ordinateur... more Selon une variante, l'invention concerne un systeme de balayage de tomographie par ordinateur destine a etre utilise pour le controle des bagages aux points de securite.
Airports International, Mar 1, 2007
This article describes the development of an explosive detection system (EDS) for use in airports... more This article describes the development of an explosive detection system (EDS) for use in airports. The EDS allows for the multiplexing of scanners with a pool of operator workstations rather than the slower in-line system. These in-line systems are particularly common in the United States, while multiplexed EDS are gaining a hold in Asia. Multiplexed systems also allow for dynamic staffing levels that are dependent on the flow of bags, with fewer staff being required during off-peak times. In-line systems do not allow for such variations and require the same amount of staffing for peak and off-peak luggage loads. Furthermore, the system, which allows for remote screening, provides staff a workstation away from distractions that may be found in the terminal.
2011 IEEE International Conference on Technologies for Homeland Security (HST), 2011
Recent threats to aviation security have focused on the passenger screening checkpoint. To name a... more Recent threats to aviation security have focused on the passenger screening checkpoint. To name a few, the Christmas Day 2009 bombing attempt, the UK liquid threat of 2006, the Richard Reid shoe bomb attempt 2002, and the 9/11 highjackings. A number of new technologies and processes have been implemented to meet this increasing threat at the checkpoint such as the
SPIE Proceedings, 1993
The feasibility of utilizing real-time computed tomography (CT) to characterize and monitor the g... more The feasibility of utilizing real-time computed tomography (CT) to characterize and monitor the growth of defects in composite materials as they undergo destructive testing was investigated. The equipment consisted of an Imatron C-100 Ultrafast CT Scanner, a modified high-temperature laboratory oven, and a motor driven hydraulic ram. Three types of composites were studied: carbon-carbon, carbon-phenolic, and glass-phenolic. Time-density profiles were obtained for each type. In general, the density of the samples decreased slightly upon impact of the ram, then sharply increased before dropping back to a slightly lower constant value.
Developments in Cardiovascular Medicine, 1993
In patients with the pre-excitation syndrome undergoing catheter- or surgical ablation, accurate ... more In patients with the pre-excitation syndrome undergoing catheter- or surgical ablation, accurate localization of accessory pathways is critical. In pre-excitation the ventricular activation sequence is altered resulting in focal areas with pre-systolic contraction. This report delineates the application of Fourier phase analysis to echocardiographic cine loops to objectively identify these focal areas and thus to localize accessory pathways. Echocardiographic phase images were prospectively obtained in 17 patients with the WPW-syndrome during normal sinus rhythm and maximal pre-excitation induced by right atrial pacing. A group of 11 normal subjects served as controls. The accuracy of phase imaging, of routine 12-lead electrocardiograms and of visual inspection of cine loop images was determined using electrophysiologic endocardial mapping as reference method.
Journal of the American College of Cardiology, 1992
Cardioverter-defibrillator implantation in 22 consecutive patients after aborted sudden cardiac d... more Cardioverter-defibrillator implantation in 22 consecutive patients after aborted sudden cardiac death was followed by prospective determination of the correct anatomic position of epicardial patch electrodes by chest X-ray study and cine computed tomography; the data were compared with the defibrillation threshold obtained intraoperatively. Patch electrode position was qualitatively graded. Computed tomography improved the assessment as compared with X-ray study in 13 patients (59%), visualizing electrodes in relation to the underlying myocardial and vascular structures. Although the computed tomographic technique provided more precise visualization, its grading of patch position correlated as poorly as that of the X-ray study with the measured acute defibrillation threshold. Three-dimensional reconstruction by computed tomography made it possible to determine quantitatively left ventricular mass (free wall and septum) and the mass encompassed by the patch electrodes. The 34.6 +/- 13.7% (range 12.6 to 61.1%) of the left ventricular mass encompassed by both patch electrodes showed a linear relation to the defibrillation threshold (r = 0.64, p = 0.01). Differentiation of free wall and septal mass in these measurements revealed that the proportion of septal mass encompassed by patch electrodes correlated closely with the defibrillation threshold (r = -0.6, p = 0.019), whereas that of the free wall mass, although significantly larger (35.4 +/- 15.8 vs. 20.6 +/- 15.4 g, p = 0.007), did not. Thus, the position of epicardial patch electrodes could be reliably determined by computed tomography.(ABSTRACT TRUNCATED AT 250 WORDS)
Journal of the American College of Cardiology, 1990
Journal of the American College of Cardiology, 1991
Circulation, 1992
BACKGROUND In patients with the preexcitation syndrome who are undergoing transcatheter or surgic... more BACKGROUND In patients with the preexcitation syndrome who are undergoing transcatheter or surgical ablation, accurate localization of accessory pathways is critical. Because preexcitation is known to alter ventricular activation sequence and result in focal areas with presystolic contraction, we investigated whether phase analysis applied to two-dimensional echocardiographic cine loops objectively identifies these focal areas and can be used to localize ventricular insertion sites of accessory pathways. METHODS AND RESULTS We prospectively obtained phase images in 17 patients (11 males; age range, 11-35 years) during minimal preexcitation in normal sinus rhythm and during maximal preexcitation induced by right atrial pacing. A group of 11 normal subjects (six men; age range, 26-37 years) served as controls. Pathway locations predicted from phase imaging were compared with those predicted from routine 12-lead ECGs, from visual inspection of cine loop images, and from catheter-mounte...
AIRPORT FORUM, 1995
SUBTITLE: DEVICES FOR SCREENING CHECKED BAGS ARE NOW AVAILABLE: THE CHALLENGE IS TO INTEGRATE THE... more SUBTITLE: DEVICES FOR SCREENING CHECKED BAGS ARE NOW AVAILABLE: THE CHALLENGE IS TO INTEGRATE THEM INTO AIRPORT BAGGAGE SYSTEMS.
Proceedings of the …, 2000
Improved log breakdown into lumber has been an active research topic since the 1960's. Demonstrat... more Improved log breakdown into lumber has been an active research topic since the 1960's. Demonstrated economic gains have driven the search for a cost-effective method to scan logs internally, from which it is assumed one can chose a better breakdown strategy. X-ray computed tomography (CT) has been widely accepted as the most promising internal imaging technique. Six design and operational constraints needed to be satisfied, however, for industrial CT of logs to become a viable reality. These are aperture size and reconstruction circle, scanning speed, scanner duty cycle, harsh industrial environments, radiation safety, and effective application sofiware. Current airport security scanners have achieved those goals and have bridged the gap between medical CT applications and industrial CT. The log scanning application has numerous similarities with the explosive detection application, which points to a relatively straightforward transition. A recent mill test of CT log scanning validates the value gains that can be realized. In some cases, those gains may become more pronounced in later processing stages. However, upstream sorting and product allocation can also lead to better resource use and an improved bottom line.
Selon une variante, l'invention concerne un systeme de balayage de tomographie par ordinateur... more Selon une variante, l'invention concerne un systeme de balayage de tomographie par ordinateur destine a etre utilise pour le controle des bagages aux points de securite.
Airports International, Mar 1, 2007
This article describes the development of an explosive detection system (EDS) for use in airports... more This article describes the development of an explosive detection system (EDS) for use in airports. The EDS allows for the multiplexing of scanners with a pool of operator workstations rather than the slower in-line system. These in-line systems are particularly common in the United States, while multiplexed EDS are gaining a hold in Asia. Multiplexed systems also allow for dynamic staffing levels that are dependent on the flow of bags, with fewer staff being required during off-peak times. In-line systems do not allow for such variations and require the same amount of staffing for peak and off-peak luggage loads. Furthermore, the system, which allows for remote screening, provides staff a workstation away from distractions that may be found in the terminal.
2011 IEEE International Conference on Technologies for Homeland Security (HST), 2011
Recent threats to aviation security have focused on the passenger screening checkpoint. To name a... more Recent threats to aviation security have focused on the passenger screening checkpoint. To name a few, the Christmas Day 2009 bombing attempt, the UK liquid threat of 2006, the Richard Reid shoe bomb attempt 2002, and the 9/11 highjackings. A number of new technologies and processes have been implemented to meet this increasing threat at the checkpoint such as the
SPIE Proceedings, 1993
The feasibility of utilizing real-time computed tomography (CT) to characterize and monitor the g... more The feasibility of utilizing real-time computed tomography (CT) to characterize and monitor the growth of defects in composite materials as they undergo destructive testing was investigated. The equipment consisted of an Imatron C-100 Ultrafast CT Scanner, a modified high-temperature laboratory oven, and a motor driven hydraulic ram. Three types of composites were studied: carbon-carbon, carbon-phenolic, and glass-phenolic. Time-density profiles were obtained for each type. In general, the density of the samples decreased slightly upon impact of the ram, then sharply increased before dropping back to a slightly lower constant value.
Developments in Cardiovascular Medicine, 1993
In patients with the pre-excitation syndrome undergoing catheter- or surgical ablation, accurate ... more In patients with the pre-excitation syndrome undergoing catheter- or surgical ablation, accurate localization of accessory pathways is critical. In pre-excitation the ventricular activation sequence is altered resulting in focal areas with pre-systolic contraction. This report delineates the application of Fourier phase analysis to echocardiographic cine loops to objectively identify these focal areas and thus to localize accessory pathways. Echocardiographic phase images were prospectively obtained in 17 patients with the WPW-syndrome during normal sinus rhythm and maximal pre-excitation induced by right atrial pacing. A group of 11 normal subjects served as controls. The accuracy of phase imaging, of routine 12-lead electrocardiograms and of visual inspection of cine loop images was determined using electrophysiologic endocardial mapping as reference method.
Journal of the American College of Cardiology, 1992
Cardioverter-defibrillator implantation in 22 consecutive patients after aborted sudden cardiac d... more Cardioverter-defibrillator implantation in 22 consecutive patients after aborted sudden cardiac death was followed by prospective determination of the correct anatomic position of epicardial patch electrodes by chest X-ray study and cine computed tomography; the data were compared with the defibrillation threshold obtained intraoperatively. Patch electrode position was qualitatively graded. Computed tomography improved the assessment as compared with X-ray study in 13 patients (59%), visualizing electrodes in relation to the underlying myocardial and vascular structures. Although the computed tomographic technique provided more precise visualization, its grading of patch position correlated as poorly as that of the X-ray study with the measured acute defibrillation threshold. Three-dimensional reconstruction by computed tomography made it possible to determine quantitatively left ventricular mass (free wall and septum) and the mass encompassed by the patch electrodes. The 34.6 +/- 13.7% (range 12.6 to 61.1%) of the left ventricular mass encompassed by both patch electrodes showed a linear relation to the defibrillation threshold (r = 0.64, p = 0.01). Differentiation of free wall and septal mass in these measurements revealed that the proportion of septal mass encompassed by patch electrodes correlated closely with the defibrillation threshold (r = -0.6, p = 0.019), whereas that of the free wall mass, although significantly larger (35.4 +/- 15.8 vs. 20.6 +/- 15.4 g, p = 0.007), did not. Thus, the position of epicardial patch electrodes could be reliably determined by computed tomography.(ABSTRACT TRUNCATED AT 250 WORDS)
Journal of the American College of Cardiology, 1990
Journal of the American College of Cardiology, 1991
Circulation, 1992
BACKGROUND In patients with the preexcitation syndrome who are undergoing transcatheter or surgic... more BACKGROUND In patients with the preexcitation syndrome who are undergoing transcatheter or surgical ablation, accurate localization of accessory pathways is critical. Because preexcitation is known to alter ventricular activation sequence and result in focal areas with presystolic contraction, we investigated whether phase analysis applied to two-dimensional echocardiographic cine loops objectively identifies these focal areas and can be used to localize ventricular insertion sites of accessory pathways. METHODS AND RESULTS We prospectively obtained phase images in 17 patients (11 males; age range, 11-35 years) during minimal preexcitation in normal sinus rhythm and during maximal preexcitation induced by right atrial pacing. A group of 11 normal subjects (six men; age range, 26-37 years) served as controls. Pathway locations predicted from phase imaging were compared with those predicted from routine 12-lead ECGs, from visual inspection of cine loop images, and from catheter-mounte...
AIRPORT FORUM, 1995
SUBTITLE: DEVICES FOR SCREENING CHECKED BAGS ARE NOW AVAILABLE: THE CHALLENGE IS TO INTEGRATE THE... more SUBTITLE: DEVICES FOR SCREENING CHECKED BAGS ARE NOW AVAILABLE: THE CHALLENGE IS TO INTEGRATE THEM INTO AIRPORT BAGGAGE SYSTEMS.
Proceedings of the …, 2000
Improved log breakdown into lumber has been an active research topic since the 1960's. Demonstrat... more Improved log breakdown into lumber has been an active research topic since the 1960's. Demonstrated economic gains have driven the search for a cost-effective method to scan logs internally, from which it is assumed one can chose a better breakdown strategy. X-ray computed tomography (CT) has been widely accepted as the most promising internal imaging technique. Six design and operational constraints needed to be satisfied, however, for industrial CT of logs to become a viable reality. These are aperture size and reconstruction circle, scanning speed, scanner duty cycle, harsh industrial environments, radiation safety, and effective application sofiware. Current airport security scanners have achieved those goals and have bridged the gap between medical CT applications and industrial CT. The log scanning application has numerous similarities with the explosive detection application, which points to a relatively straightforward transition. A recent mill test of CT log scanning validates the value gains that can be realized. In some cases, those gains may become more pronounced in later processing stages. However, upstream sorting and product allocation can also lead to better resource use and an improved bottom line.