Depth of field improvements in long wavelength imaging systems

1981 ◽  
Vol 17 (22) ◽  
pp. 860 ◽  
Author(s):  
J.C. Bennett ◽  
A. Yamani
Keyword(s):  
Imaging Systems ◽  
Depth Of Field ◽  
Long Wavelength

The Improvement and Quantitative Assessment of B-Mode Images Produced by an Annular Array/Cone Hybrid

1983 ◽  
Vol 5 (3) ◽  
pp. 195-213 ◽  
Author(s):  
M. S. Patterson ◽  
F. S. Foster
Keyword(s):  
Quantitative Assessment ◽  
Breast Tissue ◽  
Imaging Systems ◽  
Depth Of Field ◽  
Scattering Medium ◽  
Human Breast ◽  
Human Breast Tissue ◽  
New Approach ◽  
Annular Array

Hybrid ultrasound imaging systems, which combine spherical focusing on transmit with axicon focusing on receive, provide excellent resolution over a useful depth of field. This paper presents a new hybrid design with improved sensitivity, in which the axicon focusing is achieved by two conical mirrors and a PZT 5A disk cut into 8 sectors. We have investigated two methods of processing the signals from the 8 sectors. In the first, phase insensitive sector addition (PISA), the B-scan is formed from the sum of the 8 demodulated signals. In the second, multiplicative processing (MP), the 8 rf waveforms are multiplied and the resultant is demodulated to form the image. Both techniques result in smoothed speckle but degraded lateral resolution. As well, MP decreases the off-axis sensitivity of the system and artifacts characteristic of axicon focusing. Quantitative assessment of the effects of PISA and MP was performed using a new approach called contrast-to-speckle ratio (CSR). The CSR data, which is a measure of the image contrast of cylindrical voids in a random scattering medium relative to contrast fluctuations due to speckle, shows the superiority of PISA and MP. This conclusion is supported by images of in vitro human breast tissue.

Phase plate to extend the depth of field of incoherent hybrid imaging systems

2004 ◽  
Vol 43 (13) ◽  
pp. 2709 ◽  
Author(s):  
Sherif S. Sherif ◽  
W. Thomas Cathey ◽  
Ed R. Dowski
Keyword(s):  
Hybrid Imaging ◽  
Imaging Systems ◽  
Depth Of Field ◽  
Phase Plate

A Fast Optimization Method for Extension of Depth-of-Field in Three-Dimensional Task-Specific Imaging Systems

2010 ◽  
Vol 6 (10) ◽  
pp. 412-421 ◽  
Author(s):  
Saeed Bagheri ◽  
Zahra Kavehvash ◽  
Khashayar Mehrany ◽  
Bahram Javidi
Keyword(s):  
Three Dimensional ◽  
Optimization Method ◽  
Imaging Systems ◽  
Depth Of Field ◽  
Fast Optimization

scholarly journals Improved detector performance rendering in the optical spectral ranges to provide accurate image.

2019 ◽  
Vol 29 (4) ◽  
pp. 106
Author(s):  
Basaad Hadi Hamza
Keyword(s):  
Thermal Imaging ◽  
Imaging System ◽  
Imaging Systems ◽  
Sensor Systems ◽  
Thermal Detector ◽  
Detector Performance ◽  
Long Wavelength ◽  
Ir Imaging ◽  
Thermal Imaging System ◽  
Spectral Ranges

Modern sensor systems have complex sensor assemblies with performance depending on variety of factors. An algorithm presented in this work to provide accurate image rendering in the optical spectral ranges of IR imaging systems. From the images output notice that in long wavelength bandwidth of IR (8-12) µm the image was more clarity without noise. This mean S/N ratio and the Efficiency of detector is bigger than band (1-3) µm. Recommend that this method can be used to improve the performance of the thermal detector which uses in thermal imaging system in any package of wavelength. This algorithm can be store as a code in the cart storage of IR imaging system.

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