Image Quality Performance of a Dedicated Cardiac Discovery NM 530c SPECT: Impact of Time Acquisition and Reconstruction Parameters

Author(s):  
Mariana Saibt Favero ◽  
Ana Maria Marques da Silva
2017 ◽  
Vol 2017 (12) ◽  
pp. 100-104
Author(s):  
Amelia Spooner ◽  
Ashley Solter ◽  
Fernando Voltolini de Azambuja ◽  
Nitin Sampat ◽  
J. A. Stephen Viggiano ◽  
...  

2013 ◽  
Vol 475-476 ◽  
pp. 1542-1545
Author(s):  
Ya Peng Li ◽  
Bin He ◽  
Wei Sha

A mathematical model for simulating microscan of area charge coupled device (CCD) is derived and presented. The model takes into account the effect of fill factor of CCD pixel to image quality and is employed to evaluate image quality improvement introduced by microscan. Imaging results of common imaging mode, diagonal microscan and four-point microscan of area CCD with 64% pixel fill factor have been simulated on Matlab based on the proposed model, using the scene information from an existing image. Then, gray mean gradient (GMG) and energy of Laplacian (EOL) are utilized to evaluate image quality performance. GMGs of imaging results obtained by diagonal microscan and four-point microscan are improved by 3.1346, 4.2200 respectively compared with that of imaging result obtained by common imaging mode, and EOLs are enhanced by 0.2242 and 0.3697 accordingly. Research demonstrates that microscan technique can enhance image quality, and four-point microscan provides more improvement on image quality than diagonal microscan. The model can be extended for simulation of microscan of CCD with other pixel fill factors.


Author(s):  
Sami D. Alaruri

In this study, the optical performance of plastic (acrylic-polycarbonate-acrylic, acrylic-polystyrene-acrylic, PMMA-polycarbonate-PMMA, and PMMA-polystyrene-PMMA) diffraction-limited air-spaced Cooke triplet lens designs optimized for the spectral range 0.995 to 1.01 µm are presented. Comparing the acrylic-polycarbonate-acrylic air-spaced Cooke triplet lens design with the other three plastic lens designs, the obtained results indicate that the acrylic-polycarbonate-acrylic design can achieve the best image quality performance at 50% contrast 56 cycles/mm and Strehl ratio= 0.989 for the on-axis field-of-view (FOV= 0°). Furthermore, over the temperature range 18.30 to 22.25 °C and over +12° FOV the acrylic-polycarbonate-acrylic air-spaced Cooke triplet lens design performance remained diffraction-limited (Strehl ratio < 0.8). The low cost and the light weight of plastic optical components makes them attractive for several industrial applications. As an example, plastic lenses are incorporated into cell phone cameras and LED collimation optics.


2012 ◽  
Vol 7 (04) ◽  
pp. C04020-C04020 ◽  
Author(s):  
B K Cha ◽  
J Y Kim ◽  
Y J Kim ◽  
S Yun ◽  
G Cho ◽  
...  

2001 ◽  
Author(s):  
Xiaohui Wang ◽  
Richard L. Van Metter ◽  
David H. Foos ◽  
David J. Steklenski

2016 ◽  
Author(s):  
Lorenzo Zago ◽  
Benjamin Guex ◽  
Cahit Yesilyaprak ◽  
Sinan K. Yerli ◽  
Onur Keskin

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