Speckle Reduction Achievable By Spatial Compounding And Frequency Compounding: Experimental Results And Implications For Target Detectability

1987 ◽  
Author(s):  
G. E. Trahey ◽  
J. W. Allison ◽  
S. W. Smith ◽  
O. T. von Ramm
Keyword(s):  
Experimental Results ◽  
Speckle Reduction ◽  
Spatial Compounding

Multi-Angle Compound Imaging

1998 ◽  
Vol 20 (2) ◽  
pp. 81-102 ◽  
Author(s):  
Søren K. Jespersen ◽  
Jens E. Wilhjelm ◽  
Henrik Sillesen
Keyword(s):  
Excellent Agreement ◽  
Imaging System ◽  
Speckle Pattern ◽  
Speckle Reduction ◽  
Conventional Imaging ◽  
Low Contrast ◽  
Spatial Compounding ◽  
Design And Implementation ◽  
Scanning Technique

This paper reports on a scanning technique, denoted multi-angle compound imaging (MACI), using spatial compounding. The MACI method also contains elements of frequency compounding, as the transmit frequency is lowered for the highest beam angles in order to reduce grating lobes. Compared to conventional B-mode imaging MACI offers better defined tissue boundaries and lower variance of the speckle pattern, resulting in an image with reduced random variations. Design and implementation of a compound imaging system is described, images of rubber tubes and porcine aorta are shown and effects on visualization are discussed. The speckle reduction is analyzed numerically and the results are found to be in excellent agreement with existing theory. An investigation of detectability of low-contrast lesions shows significant improvements compared to conventional imaging. Finally, possibilities for improving diagnosis of atherosclerotic diseases using MACI are discussed.

Spatial Compounding Algorithm for Speckle Reduction of Dynamic Focus OCT Images

2013 ◽  
Vol 25 (15) ◽  
pp. 1439-1442 ◽  
Author(s):  
Mohammad R. N. Avanaki ◽  
Ramona Cernat ◽  
Paul J. Tadrous ◽  
Taran Tatla ◽  
Adrian Gh. Podoleanu ◽  
...  
Keyword(s):  
Speckle Reduction ◽  
Spatial Compounding

Spatial Compounding in 3D Imaging of Limbs

1997 ◽  
Vol 19 (4) ◽  
pp. 251-265 ◽  
Author(s):  
Ping He
Keyword(s):  
3D Imaging ◽  
Speckle Noise ◽  
Image Resolution ◽  
Speckle Reduction ◽  
Scanning System ◽  
Mean Power ◽  
Spatial Compounding ◽  
Resolution Improvement ◽  
Compound Angle ◽  
Mutually Independent

Effects of spatial compounding on image resolution and speckle noise are studied. Using computer simulation, it is shown that spatial compounding using averaged reconstruction can significantly improve lateral resolution while slightly deteriorate axial resolution. The amount of net resolution improvement depends mainly on the compound angle, but is insensitive to the number of component images used in compounding. While the fact that spatial compounding can effectively reduce speckle noise is well known, the analysis in this paper indicates that to maximize speckle reduction, the component echo amplitudes must meet two conditions: to be mutually independent and to have the same mean power. These findings provide useful guidelines for the analysis and optimization of the performance of an ultrasound scanning system that has been specially developed for imaging residual limbs.

scholarly journals Medical ultrasound systems

2011 ◽  
Vol 1 (4) ◽  
pp. 477-489 ◽  
Author(s):  
Jeff Powers ◽  
Frederick Kremkau
Keyword(s):  
Ultrasound Imaging ◽  
Historical Background ◽  
Handheld Devices ◽  
Speckle Reduction ◽  
Medical Ultrasound ◽  
System Architectures ◽  
Spatial Compounding ◽  
Medical Ultrasound Imaging ◽  
Ultrasound System ◽  
Flow Detection

Medical ultrasound imaging has advanced dramatically since its introduction only a few decades ago. This paper provides a short historical background, and then briefly describes many of the system features and concepts required in a modern commercial ultrasound system. The topics addressed include array beam formation, steering and focusing; array and matrix transducers; echo image formation; tissue harmonic imaging; speckle reduction through frequency and spatial compounding, and image processing; tissue aberration; Doppler flow detection; and system architectures. It then describes some of the more practical aspects of ultrasound system design necessary to be taken into account for today's marketplace. It finally discusses the recent explosion of portable and handheld devices and their potential to expand the clinical footprint of ultrasound into regions of the world where medical care is practically non-existent. Throughout the article reference is made to ways in which ultrasound imaging has benefited from advances in the commercial electronics industry. It is meant to be an overview of the field as an introduction to other more detailed papers in this special issue.

The combined effect of spatial compounding and nonlinear filtering on the speckle reduction in ultrasound images

Ultrasonics ◽  
2006 ◽  
Vol 44 (2) ◽  
pp. 166-181 ◽  
Author(s):  
Dan Adam ◽  
Simona Beilin-Nissan ◽  
Zvi Friedman ◽  
Vera Behar
Keyword(s):  
Nonlinear Filtering ◽  
Combined Effect ◽  
Speckle Reduction ◽  
Ultrasound Images ◽  
Spatial Compounding
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