Enhancement of reflection and backscattering components by plane wave imaging for estimation of surface roughness

Abstract

In the early stage of atherosclerosis, the luminal surface of the arterial wall becomes rough. Methods for distinguishing between the reflected and backscattered components in the ultrasonic echo from the arterial wall has the potential to be used as a method for assessment of the roughness of the arterial wall. In this study, we proposed a method to distinguish between the reflected and backscattered components using a technique based on plane wave compounding. This method was evaluated by experiments using planar phantoms with rough surfaces made of polyurethane rubber. The coefficient of variation calculated from the mean value of the reflection component and the standard deviation of the backscattering component was proportional to the roughness of the rubber phantom. This result shows the potential usefulness of this method for analyzing surface roughness of the arterial wall.

Robust adversarial learning model to segment non-speckle regions in blood flow echo

“…1) Ultrasonic measurement is one of the methods that can measure the cardiovascular function and in vivo blood properties noninvasively. Previous studies have developed in ultrasonic cardiovascular characterization such as vector flow [2][3][4] wall shear stress [5][6][7] wall roughness 8,9) wall displacement 10,11) and red blood cell (RBC) aggregation. [12][13][14] In cardiovascular ultrasound imaging, weak blood flow echo is obscured by clutter components from blood vessel walls and surrounding tissues, which are seen as stationary signals.…”

Numerical simulation of contact surface stress distribution based on stress-magnetization effect surface

“…In recent years, magnetic non-destructive testing technology based on the magnetization theory of ferromagnetic materials has developed rapidly [10]. This technology can not only quickly detect the stress state of materials, but also evaluate the damage state of materials [11][12][13]. Roskosz et al applied the magnetic memory method to evaluate the stress distribution of specimens containing holes under tension [14].…”

Determination of thermal and mechanical indices of an ultrasound probe with an inclined beam-axis in accordance with the new JIS (or IEC Standards)

“…Research on ultrasonic diagnosis [1][2][3][4][5][6][7][8][9][10][11][12][13] and ultrasonic therapy 14,15) are important in developing safe and highperformance medical ultrasonic equipment. As for ultrasonic diagnostic equipment, precise and practical test methods for the determination of thermal and mechanical indices related to medical diagnostic ultrasonic fields are required to ensure the safety of patients in diagnosis.…”