scholarly journals Imaging Performance of Quantitative Transmission Ultrasound

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Mark W. Lenox ◽  
James Wiskin ◽  
Matthew A. Lewis ◽  
Stephen Darrouzet ◽  
David Borup ◽  
...  
Keyword(s):  
High Resolution ◽  
Plane Wave ◽  
Inverse Scattering ◽  
Speed Of Sound ◽  
Field Of View ◽  
Water Tank ◽  
Geometric Accuracy ◽  
The Creation ◽  
Imaging Performance ◽  
Sound Maps

Quantitative Transmission Ultrasound (QTUS) is a tomographic transmission ultrasound modality that is capable of generating 3D speed-of-sound maps of objects in the field of view. It performs this measurement by propagating a plane wave through the medium from a transmitter on one side of a water tank to a high resolution receiver on the opposite side. This information is then used via inverse scattering to compute a speed map. In addition, the presence of reflection transducers allows the creation of a high resolution, spatially compounded reflection map that is natively coregistered to the speed map. A prototype QTUS system was evaluated for measurement and geometric accuracy as well as for the ability to correctly determine speed of sound.

Very High Resolution Analysis of the Dynamics of a Coronal Plasmoid

1994 ◽  
Vol 144 ◽  
pp. 593-596
Author(s):  
O. Bouchard ◽  
S. Koutchmy ◽  
L. November ◽  
J.-C. Vial ◽  
J. B. Zirker
Keyword(s):  
High Resolution ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Field Of View ◽  
Small Field ◽  
High Resolution Analysis ◽  
Ccd Observations ◽  
Resolution Analysis ◽  
Very High ◽  
Small Field Of View

AbstractWe present the results of the analysis of a movie taken over a small field of view in the intermediate corona at a spatial resolution of 0.5“, a temporal resolution of 1 s and a spectral passband of 7 nm. These CCD observations were made at the prime focus of the 3.6 m aperture CFHT telescope during the 1991 total solar eclipse.

A High Resolution Scanning Microscope

1968 ◽  
Vol 26 ◽  
pp. 356-357
Author(s):  
A. V. Crewe ◽  
J. Wall ◽  
L. M. Welter
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Spherical Aberration ◽  
Focal Length ◽  
Spot Size ◽  
Emission Source ◽  
Field Of View ◽  
Scanning Microscope ◽  
Magnetic Lens ◽  
High Quality

A scanning microscope using a field emission source has been described elsewhere. This microscope has now been improved by replacing the single magnetic lens with a high quality lens of the type described by Ruska. This lens has a focal length of 1 mm and a spherical aberration coefficient of 0.5 mm. The final spot size, and therefore the microscope resolution, is limited by the aberration of this lens to about 6 Å.The lens has been constructed very carefully, maintaining a tolerance of + 1 μ on all critical surfaces. The gun is prealigned on the lens to form a compact unit. The only mechanical adjustments are those which control the specimen and the tip positions. The microscope can be used in two modes. With the lens off and the gun focused on the specimen, the resolution is 250 Å over an undistorted field of view of 2 mm. With the lens on,the resolution is 20 Å or better over a field of view of 40 microns. The magnification can be accurately varied by attenuating the raster current.

Design of Airborne Multi-Scale Wide-Field-of-View and High-Resolution Imaging System

2021 ◽  
Vol 41 (2) ◽  
pp. 0208002
Author(s):  
李江勇 Li Jiangyong ◽  
冯位欣 Feng Weixin ◽  
刘飞 Liu Fei ◽  
魏雅喆 Wei Yazhe ◽  
邵晓鹏 Shao Xiaopeng
Keyword(s):  
High Resolution ◽  
Imaging System ◽  
Field Of View ◽  
Wide Field ◽  
High Resolution Imaging ◽  
Multi Scale ◽  
Wide Field Of View ◽  
Resolution Imaging

Solid-state VCSEL beam scanner with ultra-large field of view and high resolution

2021 ◽  
Author(s):  
Ruixiao Li ◽  
Zeuku Ho ◽  
Xiaodong Gu ◽  
Satoshi Shinada ◽  
Fumio Koyama
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Field Of View ◽  
Large Field

The Best of Both Worlds: 3D X-ray Microscopy with Ultra-high Resolution and a Large Field of View

2011 ◽  
Author(s):  
W. Li ◽  
J. Gelb ◽  
Y. Yang ◽  
Y. Guan ◽  
W. Wu ◽  
...  
Keyword(s):  
High Resolution ◽  
Field Of View ◽  
Large Field ◽  
X Ray

Direct imaging of direction-controlled molecular rotational wave packets created by a polarization-skewed double-pulse

2020 ◽  
Vol 22 (19) ◽  
pp. 10853-10862
Author(s):  
Kenta Mizuse ◽  
Naoya Sakamoto ◽  
Romu Fujimoto ◽  
Yasuhiro Ohshima
Keyword(s):  
High Resolution ◽  
Wave Packets ◽  
Double Pulse ◽  
Direct Imaging ◽  
Creation Process ◽  
Rotational Wave ◽  
The Creation

High-resolution molecular movies of direction-controlled rotational wave packets are reported, providing insights into the creation process and detailed dynamics of wave packets.

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