Continuous Shear Wave Elastography for Liver Using Frame-to-Frame Equalization of Complex Amplitude
This study addresses a crucial necessity in the field of noninvasive liver fibrosis diagnosis by introducing the concept of continuous shear wave elastography (C-SWE), utilizing an external vibration source and color Doppler imaging. However, an application of C-SWE to assess liver elasticity, a deep region within the human body, arises an issue of signal instability in the obtained data. To tackle this challenge, this work proposes a method involving the acquisition of multiple frames of datasets, which are subsequently compressed. Furthermore, the proposed frame-to-frame equalization method compensates discrepancies in t...
Source: Ultrasonic Imaging - April 23, 2024 Category: Radiology Authors: Naoki Tano Ren Koda Shunichiro Tanigawa Naohisa Kamiyama Yoshiki Yamakoshi Marie Tabaru Source Type: research
Demonstration Study of Reflector-Based Volumetric Speed-of-Sound Imaging With Linear Ultrasound Arrays
In this study, we introduce a 3D SoS reconstruction system that utilizes hand-held linear arrays instead. This system employs a passive reflector positioned opposite the linear arrays, serving as an echogenic reference for time-of-flight (ToF) measurements, and a high-definition camera to track the location corresponding to each group of transmit-receive data. To merge these two streams of ToF measurements and location tracking, a voxel-based reconstruction algorithm is implemented. Experimental results with gelatin phantom and ex vivo tissue have demonstrated the stability of our proposed method. Moreover, the results und...
Source: Ultrasonic Imaging - April 22, 2024 Category: Radiology Authors: Xiaoyi Jiang Kexin Gan Yuxin Wang Chao Tao Xiaojun Liu Jie Yuan Zhibin Jin Source Type: research
Pulmonary Transit Time Assessment by CEUS in Healthy Rabbits: Feasibility, and the Effects of UCAs Dilution Concentration
Ultrason Imaging. 2024 Apr 15:1617346241246169. doi: 10.1177/01617346241246169. Online ahead of print.ABSTRACTTo evaluate the inter-observer variability and the intra-observer repeatability of pulmonary transit time (PTT) measurement using contrast-enhanced ultrasound (CEUS) in healthy rabbits, and assess the effects of dilution concentration of ultrasound contrast agents (UCAs) on PTT. Thirteen healthy rabbits were selected, and five concentrations UCAs of 1:200, 1:100, 1:50, 1:10, and 1:1 were injected into the right ear vein. Five digital loops were obtained from the apical 4-chamber view. Four sonographers obtained PTT...
Source: Ultrasonic Imaging - April 16, 2024 Category: Radiology Authors: Song Kang Jianfeng Chen He Zhang Guangyin Li Yingying Liu Xue Mei Binyang Zhu Xin Ai Shuangquan Jiang Source Type: research
IMU-Assisted Manual 3D-Ultrasound Imaging Using Motion-Constrained Swept-Fan Scans
Ultrason Imaging. 2024 Apr 10:1617346241242718. doi: 10.1177/01617346241242718. Online ahead of print.ABSTRACTThree-dimensional (3D) ultrasonic imaging can enable post-facto plane of interest selection. It can be performed with devices such as wobbler probes, matrix probes, and sensor-based probes. Ultrasound systems that support 3D-imaging are expensive with added hardware complexity compared to 2D-imaging systems. An inertial measurement unit (IMU) can potentially be used for 3D-imaging by using it to track the motion of a one-dimensional array probe and constraining its motion in one degree of freedom (1-DoF) rotation (...
Source: Ultrasonic Imaging - April 10, 2024 Category: Radiology Authors: Aparna Harindranath Komal Shah Dhinagaran Devadass Arun George Kajoli Banerjee Krishnan Manish Arora Source Type: research
Human Observer Sensitivity to Temporal Noise During B-Mode Ultrasound Scanning: Characterization and Imaging Implications
This study demonstrates how noise perception thresholds can be applied to help design or tune ultrasound systems for different imaging tasks and noise conditions.PMID:38497455 | DOI:10.1177/01617346241236160 (Source: Ultrasonic Imaging)
Source: Ultrasonic Imaging - March 18, 2024 Category: Radiology Authors: Matthew T Huber Katelyn M Flint Patricia J McNally Sarah C Ellestad Gregg E Trahey Source Type: research
