The influence of focal spot blooming on high-contrast spatial resolution in CT imaging

2015 ◽  
Vol 42 (10) ◽  
pp. 6011-6020 ◽  
Author(s):  
Joshua Grimes ◽  
Xinhui Duan ◽  
Lifeng Yu ◽  
Ahmed F. Halaweish ◽  
Nicole Haag ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Focal Spot ◽  
Ct Imaging ◽  
High Contrast

scholarly journals Modified ideal observer model (MIOM) for high-contrast and high-spatial resolution CT imaging tasks

2017 ◽  
Vol 44 (9) ◽  
pp. 4496-4505 ◽  
Author(s):  
Juan P. Cruz-Bastida ◽  
Daniel Gomez-Cardona ◽  
John Garrett ◽  
Timothy Szczykutowicz ◽  
Guang-Hong Chen ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Ct Imaging ◽  
Ideal Observer ◽  
High Contrast ◽  
Observer Model

scholarly journals Improve spatial resolution by Modeling Finite Focal Spot (MFFS) for industrial CT reconstruction

2014 ◽  
Vol 22 (25) ◽  
pp. 30641 ◽  
Author(s):  
Ming Chang ◽  
Yongshun Xiao ◽  
Zhiqiang Chen
Keyword(s):  
Spatial Resolution ◽  
Focal Spot ◽  
Ct Reconstruction ◽  
Industrial Ct

Improved spatial resolution and lower-dose pediatric CT imaging: a feasibility study to evaluate narrowing the X-ray photon energy spectrum

2014 ◽  
Vol 44 (8) ◽  
pp. 1026-1030
Author(s):  
Mark G. Benz ◽  
Matthew W. Benz ◽  
Steven B. Birnbaum ◽  
Eric Chason ◽  
Brian W. Sheldon ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Feasibility Study ◽  
Spatial Resolution ◽  
Photon Energy ◽  
Ct Imaging ◽  
X Ray ◽  
Pediatric Ct ◽  
Photon Energy Spectrum

A novel objective method for assessing high-contrast spatial resolution in CT based on the Rayleigh criterion

2017 ◽  
Vol 44 (2) ◽  
pp. 460-469
Author(s):  
Pu Zhang ◽  
Guoqing Wan ◽  
Fei Li ◽  
Xingdong Li ◽  
Wenli Liu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Objective Method ◽  
High Contrast ◽  
Rayleigh Criterion

scholarly journals Objective comparison of high-contrast spatial resolution and low-contrast detectability for various clinical protocols on multiple CT scanners

2017 ◽  
Vol 44 (9) ◽  
pp. e153-e163 ◽  
Author(s):  
Damien Racine ◽  
Anaïs Viry ◽  
Fabio Becce ◽  
Sabine Schmidt ◽  
Alexandre Ba ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Contrast ◽  
Clinical Protocols ◽  
Low Contrast ◽  
Ct Scanners

Image Quality in Mammography with Special Reference to Anti-Scatter Grids and the Magnification Technique

1986 ◽  
Vol 27 (4) ◽  
pp. 467-479 ◽  
Author(s):  
B. Nielsen ◽  
G. Fagerberg
Keyword(s):  
Image Quality ◽  
Spatial Resolution ◽  
Scattered Radiation ◽  
Focal Spot ◽  
Absorbed Dose ◽  
Standard Technique ◽  
Spot Size ◽  
Limiting Factor ◽  
Film System ◽  
Tube Potential

Some of the parameters determining image quality in mammography are analyzed: the effects of primary photon spectra, focal spot size and screen-film systems on spatial resolution are discussed as are scattered radiation, development temperature and absorbed dose. The parameters limiting spatial resolution and contrast are evaluated for the standard and magnification techniques. Methods of reducing scattered radiation to improve contrast are evaluated. Scatter to primary ratios for different scatter reducing methods are compared, using the physical quantity energy imparted. For the standard technique the spatial resolution has been found to be limited by the fluorescent screen. With magnification technique the focal spot is the weakest link for the spatial resolution. The contrast is mainly set by the amount of scatter using the standard technique considering the use of a low tube potential (∼25 kVp). Using the magnification technique the amount of scatter is so small, that the tube potential is the limiting factor. We have found the optimized standard mammographic technique to be achieved under the following conditions: 25 kVp, 0.3 to 0.6 mm focal spot, film-focus distance 500 mm, anti-scatter grid, developing temperature 36 to 38°C and 4 minutes total processing time with the screen-film system we have used. In magnification technique an air gap of at least 20 mm is desired. With an FFD of about 500 mm this will give a magnification ratio of 1.8 to 2.0 and a 0.1 mm × 0.1 mm focus spot is mandatory. With this technique, it is necessary to use a faster screen-film system than that used in standard mammography.

SU-GG-I-35: Geometric Accuracy of High Contrast Region Visualization On 4D X-Ray CT Imaging Using Sinogram Binning

2008 ◽  
Vol 35 (6Part3) ◽  
pp. 2650-2650
Author(s):  
M Rosu ◽  
E Weiss ◽  
M Wiesmeyer ◽  
A Brady ◽  
J Williamson
Keyword(s):  
Ct Imaging ◽  
High Contrast ◽  
Geometric Accuracy ◽  
X Ray
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