scholarly journals Derivation of sonograph quality parameters by the use of Point Spread Function analysis

2007 ◽  
pp. S69-S76
Author(s):  
L Doležal ◽  
J Mazura ◽  
J Tesařík ◽  
H Kolářová ◽  
D Korpas ◽  
...  
Keyword(s):  
Point Spread Function ◽  
Function Analysis ◽  
Side Lobe ◽  
Quality Parameters ◽  
Measuring System ◽  
System A ◽  
Point Spread ◽  
Measurement Results ◽  
Spread Function ◽  
Computer Controlled

A measuring system evaluating a Point Spread Function generated in an ultrasonographic image by scanning a spherical target was developed. The target is moved in measuring bath filled by water over scanned volume via 3D computer controlled positioning system. A video signal obtained is converted to digital form and analyzed by original software to derive various objective parameters of the imager as follows: Focal areas in both the azimuth and the elevation directions, Ultrasound scanning lines visualisation, Manufacturer preloaded TGC, Width of the scanning plane, Side lobe levels and Amplification uniformity in the azimuth direction. The method was verified by testing 18 different equipments in 282 measurements. Samples of particular measurement results in form of graphical outputs are included. Medical and physiological impacts of this approach are discussed.

scholarly journals Numerical characterization of an ultra-high NA coherent fiber bundle part II: point spread function analysis

2013 ◽  
Vol 21 (21) ◽  
pp. 25403 ◽  
Author(s):  
Stefaan Heyvaert ◽  
Heidi Ottevaere ◽  
Ireneusz Kujawa ◽  
Ryszard Buczynski ◽  
Hugo Thienpont
Keyword(s):  
Point Spread Function ◽  
Fiber Bundle ◽  
Function Analysis ◽  
Point Spread ◽  
Numerical Characterization ◽  
Spread Function

scholarly journals Point spread function analysis in a child with ectopia lentis: objective optical function evaluation and correction of refractive errors

2009 ◽  
Vol 87 (5) ◽  
pp. 567-569
Author(s):  
Mari Goto ◽  
Takako Tachikawa ◽  
Kazuno Negishi ◽  
Kazuhiko Ohnuma ◽  
Masahiro Shibutani ◽  
...  
Keyword(s):  
Point Spread Function ◽  
Function Analysis ◽  
Optical Function ◽  
Function Evaluation ◽  
Refractive Errors ◽  
Ectopia Lentis ◽  
Point Spread ◽  
Spread Function

Centroids computation and point spread function analysis for reverse Hartmann test

2017 ◽  
Vol 387 ◽  
pp. 328-337 ◽  
Author(s):  
Zhu Zhao ◽  
Mei Hui ◽  
Ming Liu, Liquan Dong, Lingqin Kong, Yuejin Zhao
Keyword(s):  
Point Spread Function ◽  
Function Analysis ◽  
Point Spread ◽  
Spread Function ◽  
Hartmann Test
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