نتایج جستجو برای: field scanner

تعداد نتایج: 803839  

Journal: :Optics express 2006
Kristen Carlson Maitland Hyun Joon Shin Hyejun Ra Daesung Lee Olav Solgaard Rebecca Richards-Kortum

We present a single fiber reflectance confocal microscope with a two dimensional MEMS gimbaled scanner. Achieved lateral and axial resolutions are 0.82 mum and 13 mum, respectively. The field of view is 140 x 100 mum at 8 frames/second. Images and videos of cell phantoms and tissue are presented with sub-cellular resolution.

Journal: :Neurosurgery 2008
Christian Senft Volker Seifert Elvis Hermann Kea Franz Thomas Gasser

OBJECTIVE The aim of this study was to demonstrate the usefulness of a mobile, intraoperative 0.15-T magnetic resonance imaging (MRI) scanner in glioma surgery. METHODS We analyzed our prospectively collected database of patients with glial tumors who underwent tumor resection with the use of an intraoperative ultra low-field MRI scanner (PoleStar N-20; Odin Medical Technologies, Yokneam, Isr...

2009
G. C. Wiggins B. Zhang R. Lattanzi D. Sodickson

Introduction: The dimensions of the RF shield and the RF frequency for proton imaging at 7T allow the excitation of a propagating TE11 waveguide mode, which has given rise to the concept of traveling wave imaging [1]. RF excitation is typically achieved by using a patch antenna or crossed dipole antenna placed at one end of the bore [1, 2]. A nearly uniform B1 field is produced along the entire...

2012
John F. Kennedy

The most critical component in lidar is its laser scanner, which delivers pulsed or CW laser to target with desirable field of view (FOV). Most existing lidars use a rotating or oscillating mirror for scanning, resulting in several drawbacks. A lidar scanning technology was developed that could achieve very high scanning speed, with an ultra-miniature size and much lighter weight. This technolo...

Journal: :Medical physics 2002
Ge Wang

Because the sizes of samples differ in x-ray micro-CT applications, it is desirable to have a mechanism to change the field of view of a micro-CT scanner. A well-known way to double the diameter of the field of view is to displace a detector array by 50%. In this paper, we propose to displace a detector array by an amount of greater than 0% but less than 50% for a continuously adjustable field ...

2006
J. Stefan Petersson Edvin Johansson Peter Magnusson Sven Månsson

Where tanh is the hyperbolic tangens function, h the Planck constant, BBo is the main magnetic field strength, kBB the Boltzmann constant and T is the temperature. At a magnetic field of 1.5 T the polarization of the protons (H) at body temperature is only ∼5 x 10 and for C ∼1.0 x 10. The polarization is proportional to the magnetic field strength. Consequently, a 3 T scanner will result in a d...

Journal: :The International Journal of Advanced Manufacturing Technology 2021

Digital three-dimensional (3D) scanning is a cutting-edge metrology method that can digitally reconstruct surface topography with high precision and accuracy. Such help traditional manufacturing processes evolve into smart paradigm, which ensure product quality by automated sensing control. However, due to limitations the spatial resolution, speed, size of focusing area, commercially available ...

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