The relationship between the retinal image quality and the refractive index of defects arising in IOL: numerical analysis

2017 ◽  
Author(s):  
Malwina Geniusz
Keyword(s):  
Refractive Index ◽  
Numerical Analysis ◽  
Image Quality ◽  
Retinal Image ◽  
The Relationship

Retinal image quality in myopic subjects after refractive surgery

2000 ◽  
Vol 47 (9) ◽  
pp. 1587-1598 ◽  
Author(s):  
J. R. Jiménez ◽  
R. G. Anera ◽  
L. Jiménez Del Barco ◽  
L. Carretero
Keyword(s):  
Image Quality ◽  
Retinal Image ◽  
Refractive Surgery

scholarly journals CT image quality influence on different material Edge Response Functions for accurate metrological applications

2021 ◽  
Vol 1193 (1) ◽  
pp. 012064
Author(s):  
I Holgado ◽  
J Iglesias ◽  
N Ortega ◽  
S Plaza ◽  
A Pascual
Keyword(s):  
Image Quality ◽  
Spot Size ◽  
Ct Measurements ◽  
Aluminium Copper ◽  
Measurement Results ◽  
X Ray Computed ◽  
Ct Image Quality ◽  
The Relationship ◽  
Ct Measurement ◽  
Edge Response

Abstract The main objective of the proposed work was to analyse the influence of magnification and focal spot size scan settings on X-ray computed tomography (CT) measurements results under commercial threshold-based algorithms. The relationship between spatial resolution and contrast sensitivity in CT scans of different materials and the accuracy of the resulting CT measurement results is discussed. For that purpose, Aluminium, Copper, Inconel 718 and Titanium disk phantoms were scanned. Preliminary measurements showed that deviations can increase up to 0.48% when the scanning magnification was increased while, for a given magnification, the decrease of a focus size from 1mm to 0.4mm slightly improves the differences up to 0.15%, being negligible at low magnifications. Unsharpness (U T ) and contrast-to-noise ratio (CNR) were calculated for each scanning conditions according to standard ASTM E1695 – 20. A new image quality indicator that includes the combined effect of the U T and CNR was proposed in order to relate measurement error with the image quality. The indicator proves that the influence of CNR is much higher than influence of U T on the CT measurements.

Retinal image quality

2000 ◽  
pp. 194-210
Author(s):  
David A. Atchison ◽  
George Smith
Keyword(s):  
Image Quality ◽  
Retinal Image
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