Transient Flow Vector Distribution of Cavitation Bubbles in a Vessel Induced by Pulsed Focused Ultrasound Thrombolysis Based on Pyramid LK Optical Flow Method

2021 ◽  
Author(s):  
Ting Ding ◽  
Huizhu Jia ◽  
Zhixin Tian ◽  
Shuai Tian
Keyword(s):  
Optical Flow ◽  
Focused Ultrasound ◽  
Transient Flow ◽  
Flow Method ◽  
Optical Flow Method ◽  
Flow Vector ◽  
Cavitation Bubbles ◽  
Vector Distribution ◽  
Pulsed Focused Ultrasound

Optical-Flow Algorithm for Near-Wake Analysis of Axisymmetric Blunt-Based Body at Low-Speed Conditions

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
The Hung Tran ◽  
Lin Chen
Keyword(s):  
Optical Flow ◽  
Cross Correlation ◽  
Transient Flow ◽  
Wake Flow ◽  
Near Wake ◽  
Dominant Type ◽  
Low Speed ◽  
Flow Method ◽  
Optical Flow Method ◽  
Flow Algorithm

Abstract In this study, ability of an optical-flow algorithm in extracting wake structure of axisymmetric model was investigated. The initial data for optical-flow processing were obtained in low-speed conditions by particle image velocimetry method. The Reynolds number based on the model diameter was around ReD = 1.97 × 104 in this study. Both the time-averaged and transient flow characteristics of near-wake flow were illustrated and examined by the optical-flow analysis method proposed. The processing results of optical-flow method showed good agreement with conventional cross-correlation methods. The ability of optical-flow method to extract flow fields was, thereby, confirmed for blunt-based flow at low-speed conditions. This study showed that the antisymmetric flow behavior of the near wake is the dominant type at low-speed conditions. Differing to traditional methods and cross-correlation results, the optical-flow results showed a frequency at around StD = 0.015 of the near wake for the first time, which is connected to vortex shedding behavior of the wake flow.

Application of an Optical Flow Method to Inspiratory and Expiratory Lung MDCT to Assess Regional Air Trapping: A Feasibility Study

2007 ◽  
Vol 188 (3) ◽  
pp. W276-W280 ◽  
Author(s):  
Drew A. Torigian ◽  
Warren B. Gefter ◽  
John D. Affuso ◽  
Kiarash Emami ◽  
Lawrence Dougherty
Keyword(s):  
Optical Flow ◽  
Feasibility Study ◽  
Air Trapping ◽  
Flow Method ◽  
Optical Flow Method

Optical flow method for neutron radiography flow diagnostics

2021 ◽  
Vol 33 (10) ◽  
pp. 101702
Author(s):  
Tianshu Liu ◽  
Robert Zboray ◽  
Pavel Trtik ◽  
Lian-Ping Wang
Keyword(s):  
Optical Flow ◽  
Neutron Radiography ◽  
Flow Diagnostics ◽  
Flow Method ◽  
Optical Flow Method
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