In vivo droplet vaporization for occlusion therapy and phase aberration correction

2002 ◽  
Vol 49 (6) ◽  
pp. 726-738 ◽  
Author(s):  
O.D. Kripfgans ◽  
J.B. Fowlkes ◽  
M. Woydt ◽  
O.P. Eldevik ◽  
P.L. Carson
Keyword(s):  
Aberration Correction ◽  
Phase Aberration ◽  
Droplet Vaporization ◽  
Occlusion Therapy

In vivo phase aberration correction for high intensity focused ultrasound therapy with a 256-element spiral array

2021 ◽  
Vol 150 (4) ◽  
pp. A86-A86
Author(s):  
Gilles P. Thomas ◽  
Tatiana D. Khokhlova ◽  
Yak-Nam Wang ◽  
Stephanie Totten ◽  
George R. Schade ◽  
...  
Keyword(s):  
High Intensity ◽  
Focused Ultrasound ◽  
High Intensity Focused Ultrasound ◽  
Ultrasound Therapy ◽  
Aberration Correction ◽  
Phase Aberration ◽  
Spiral Array

scholarly journals A Locally Adaptive Phase Aberration Correction (LAPAC) Method for Synthetic Aperture Sequences

2018 ◽  
Vol 41 (1) ◽  
pp. 3-16 ◽  
Author(s):  
Gustavo Chau ◽  
Marko Jakovljevic ◽  
Roberto Lavarello ◽  
Jeremy Dahl
Keyword(s):  
Speed Of Sound ◽  
Near Field ◽  
Ultrasound Image ◽  
Synthetic Aperture ◽  
Aberration Correction ◽  
Phase Aberration ◽  
Locally Adaptive ◽  
Diagnostic Capabilities ◽  
Screen Model

Phase aberration is a phenomenon caused by heterogeneity of the speed of sound in tissue, in which the actual speed of sound of the tissue is different than the assumed speed of sound used for beamforming. It reduces the quality and resolution of ultrasonic images and impairs clinical diagnostic capabilities. Although phase aberration correction (PAC) methods can reduce these detrimental effects, most practical implementations of PAC methods are based on the near field phase screen model, which have limited ability to represent the true aberration induced by inhomogeneous tissue. Accordingly, we propose a locally adaptive phase aberration correction (LAPAC) method that is applied through the use of synthetic aperture. The method is tested using full-wave simulations of models of human abdominal wall, experiments with tissue aberrators, and in vivo carotid images. LAPAC is compared with conventional phase aberration correction (cPAC) where aberration profiles are computed at a preselected depth and applied to the beamformer’s time delays. For all experiments, LAPAC shows an average of 1 to 2 dB higher contrast than cPAC, and enhancements of 3 to 7 dB with respect to the uncorrected cases. We conclude that LAPAC may be a viable option to enhance ultrasound image quality images even in the presence of clinically relevant aberrating conditions.

scholarly journals In Vivo Microscopy of Targeted Vessel Occlusion Employing Acoustic Droplet Vaporization

2012 ◽  
Vol 19 (6) ◽  
pp. 501-509 ◽  
Author(s):  
STANLEY SAMUEL ◽  
AMBROISE DUPREY ◽  
MARIO L. FABIILLI ◽  
JOSEPH L. BULL ◽  
JEFFREY BRIAN FOWLKES
Keyword(s):  
In Vivo Microscopy ◽  
Vessel Occlusion ◽  
Acoustic Droplet Vaporization ◽  
Droplet Vaporization
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