Results 221 to 230 of about 11,508 (252)
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Development of a 12 element annular array transducer for realtime ultrasound imaging
Ultrasound in Medicine & Biology, 1989While the recent proliferation of ultrasound scanners based on annular array transducers has attracted widespread attention, very little published information is available on the physics, design criteria, and signal processing aspects of these instruments.
F S, Foster +5 more
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High Resolution Solar Imaging at 165 μ with a 64-Element Array
Applied Optics, 1972An imaging system using a 64-element array of PbS detectors has been successfully tested at Kitt Peak. The first images of the low contrast solar granulation at 1.65 micro have been obtained with a signal-to-noise ratio better than 200 and a resolution of the order of 1 see of arc. The problem of imaging systems for low contrast objects in the infrared
P J, Turon, D, Stefanovitch
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Image-Guided 256-Element Phased-Array Focused Ultrasound Surgery
IEEE Engineering in Medicine and Biology Magazine, 2008In this article, the construction and functions of ultrasound-guided 256-element phased-array surgery system is described. An image-guided phase array therapy system has been developed. Several flexible multifocus control methods for accurate, highly efficient, and fit-to-shape ultrasound surgery are concentrated.
Mingzhu, Lu +6 more
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Using co-prime arrays to reduce the number of array elements in ultrasonic imaging
Proceedings of Meetings on AcousticsReducing the number of array elements in ultrasonic imaging is crucial for lowering system cost and improving scalability. This study introduces a co-prime array configuration to achieve high-resolution imaging with fewer elements. A co-prime array synthesizes a beam pattern equivalent to that of an array with N×M elements by multiplying the beam ...
Satoshi Nakayama, Norio Tagawa
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3D Integral Imaging Encryption Using a Depth-Converted Elemental Image Array
Applied Mechanics and Materials, 2013We propose a three-dimensional (3D) image encryption method based on the modified computational integral imaging (CII) technique with the smart pixel mapping (SPM) algorithm, which is introduced for reconstructing orthoscopic 3D images with improved image quality.
Xiao Wei Li +3 more
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A 1024-element bulk-micromachined thermopile infrared imaging array
Sensors and Actuators A: Physical, 1999Abstract This paper reports on a bulk-micromachined silicon uncooled thermal imager intended for use in automated semiconductor process control. The device has a responsivity of 15 V/W, a thermal time constant of 1 ms, and a D* of 1.6×107 cm Hz1/2/W. It is organized as a 32×32-element area array with on-chip address generation, multiplexing, and self-
Andrew D Oliver, Kensall D Wise
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Optimization on ultrasound imaging gathered by an array transducer with element failure
2016 IEEE International Ultrasonics Symposium (IUS), 2016The array transducer is a key unit to the phased ultrasound imaging systems. While, size error or element failure of elements are often occurred on the array transducer. Those situations could make serious negative effects on the acoustic field distribution of an array and impact on the quality of ultrasound imaging.
null Guanjun Yin +3 more
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Array element failure correction for robust ultrasound beamforming and imaging
2010 IEEE International Ultrasonics Symposium, 2010If the elements in an ultrasound array are damaged, the beamforming performance and imaging quality (contrast and resolution) will be significantly reduced due to the distorted beam pattern with for example, a significant increase of sidelobe level. Defective elements can be detected through either in-direct impedance measurement or direct monitoring ...
Minghui Li +3 more
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A Buttable 2048 X 96 Element TDI Imaging Array
SPIE Proceedings, 1984This paper presents the development of an electro-optic sensor used in the assembly of a 130-mm long focal plane array. The sensor is a buttable 2048 x 96 element TDI (Time Delay and Integrate) CCD imager. The design, architecture and processing of this optical imager are described, as are particular problems associated with buttability and assembly ...
Joseph P. Ellul +5 more
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A Flexible Image Processor Using Array Elements
The Papers of the Fifth Workshop on Computer Architecture for Non-Numeric Processing on -, 1980Ronnie K. Poon, Kwan Y. Wong
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