Passive Acoustic Mapping for Convex Arrays With the Helical Wave Spectrum Method

被引:1
|
作者
Zhu, Hui [1 ,2 ,3 ]
Zeng, Yi [1 ]
Cai, Xiran [1 ,4 ]
机构
[1] ShanghaiTech Univ, Sch Informat Sci & Technol, Shanghai 201210, Peoples R China
[2] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] ShanghaiTech Univ, Shanghai Engn Res Ctr Intelligent Vis & Imaging, Shanghai 201210, Peoples R China
关键词
Convex array; passive acoustic mapping; helical wave spectrum; CAVITATION; ULTRASOUND; TUMORS; TRIAL;
D O I
10.1109/TMI.2024.3352283
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Passive acoustic mapping (PAM) has emerged as a valuable imaging modality for monitoring the cavitation activity in focused ultrasound therapies. When it comes to imaging in the human abdomen, convex arrays are preferred due to their large acoustic window. However, existing PAM methods for convex arrays rely on the computationally expensive delay-and-sum (DAS) operation limiting the image reconstruction speed when the field-of-view (FOV) is large. In this work, we propose an efficient and frequency-selective PAM method for convex arrays. This method is based on projecting the helical wave spectrum (HWS) between cylindrical surfaces in the imaging field. Both the in silico and in vitro experiments showed that the HWS method has comparable image quality and similar acoustic cavitation source localization accuracy as the DAS-based methods. Compared to the frequency-domain and time-domain DAS methods, the time-complexity of the HWS method is reduced by one order and two orders of magnitude, respectively. A parallel implementation of the HWS method realized millisecond-level image reconstruction speed. We also show that the HWS method is inherently capable of mapping microbubble (MB) cavitation activity of different status, i.e., no cavitation, stable cavitation, or inertial cavitation. After compensating for the lens effects of the convex array, we further combined PAM formed by the HWS method and B-mode imaging as a real-time dual-mode imaging approach to map the anatomical location where MBs cavitate in a liver phantom experiment. This method may find use in applications where convex arrays are required for cavitation activity monitoring in real time.
引用
收藏
页码:1923 / 1933
页数:11
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