[1]张亚东,郑驰超△,彭虎.基于自适应调节过零点系数的远聚焦超声成像算法[J].生物医学工程研究,2021,04:380-388.
ZHANG Yadong,ZHENG Chichao,PENG Hu.Far-focused ultrasound imaging based on adaptive zero-crossing factor[J].Journal of Biomedical Engineering Research,2021,04:380-388.
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基于自适应调节过零点系数的远聚焦超声成像算法(PDF)
《生物医学工程研究》[ISSN:1006-6977/CN:61-1281/TN]
- 期数:
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2021年04期
- 页码:
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380-388
- 栏目:
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- 出版日期:
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2021-12-25
文章信息/Info
- Title:
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Far-focused ultrasound imaging based on adaptive zero-crossing factor
- 文章编号:
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1672-6278 (2021)04-0380-09
- 作者:
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张亚东1; 2; 郑驰超1△; 彭虎1
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1.合肥工业大学生物医学工程系,合肥 230009;2.安徽医科大学第一附属医院医学工程部,合肥 230022
- Author(s):
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ZHANG Yadong1; 2; ZHENG Chichao1; PENG Hu1
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1.Department of Biomedical Engineering, Hefei University of Technology, Hefei 230009, China;2.Department of Medical Engineering, the First Affiliated Hospital of Anhui Medical University, Hefei 230022
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- 关键词:
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超声成像; 远聚焦像素点成像; 过零点系数; 自适应加权; 散斑信噪比; 高质量
- Keywords:
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Ultrasound imaging; Far-focused pixel-based imaging; Adaptive zero-corssing Factor; Adaptive weighting; Speckle signal noise ratio; High quality
- 分类号:
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R318;TN911.7;R445.1
- DOI:
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10.19529/j.cnki.1672-6278.2021.04.07
- 文献标识码:
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A
- 摘要:
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远聚焦像素(far-focused pixel-based, FPB)成像可以在被测区域外形成虚拟聚焦点,根据焦点位置对被测区域内每个像素点进行复合成像,在整个区域内均具有较好的分辨率。FPB一般采用延时叠加(delay-and-sum,DAS)的波束形成算法进行成像,成像质量有待改善。相干系数(coherence factor, CF)加权算法可以有效地抑制噪声,提高对比度,但会降低背景区域的成像质量。本研究利用FPB成像方式,根据CF系数可以有效反应信号相干性的特点,将其作为调节系数,结合信号的过零点数,提出一种自适应调节的过零点系数(adaptive zero-corssing factor,aZF),并用该系数对FPB进行加权成像。仿真和实验结果表明,相对于传统的CF算法,aZF加权算法可以进一步提高对比度,并改善背景成像质量。
- Abstract:
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The far-focused pixel-based (FPB) imaging algorithm can achieve a high image resolution throughout the imaging area by focusing the ultrasonic beam outside the imaging area and then performing compound imaging for every pixel. However, the image quality obtained by FPB still need to be improved due to the delay-and-sum (DAS) beamforming method. Coherence factor (CF) can effectively suppress noise, thereby increasing the contrast, however the image quality of background region is decreased. According to the characteristics that CF can effectively reflect the signal coherence, we used CF as the adjustment coefficient,and combined the zero-crossing numbers of the signal to propose an adaptive zero-crossing factor (aZF). The simulation and experimental results show that compared with the traditional CF algorithm, the aZF weighted algorithm can further increase the contrast and improve the background speckle quality.
备注/Memo
- 备注/Memo:
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(收稿日期:2021-03-21)△通信作者Email:cczheng@hfut.edu.cn
更新日期/Last Update:
2022-01-17