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空间域脉冲宽度对超声波计算机断层扫描中的散射图像分辨率的影响
Qiude Zhang1, Quanquan Liu1, Zhaohui Liu1
1Biomedical Engineering Department, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
Physics in medicine and biology
|July 26, 2023
概括
这项研究引入了空间域脉冲宽度扩大因子 (SDPWBF) 来提高超声计算机断层扫描 (USCT) 图像分辨率. 更小的SDPWBF,通过更短的元素距离实现,提高图像质量和信号噪声比.
科学领域:
- 医疗成像医学成像
- 生物医学工程 生物医学工程
- 声学 声学 在声学上
背景情况:
- 全孔断层扫描 (FAT) 是基于圆环阵列 (CRA) 的超声波计算断层扫描 (USCT) 的标准.
- 由于空间域脉冲宽度 (SDPW),FAT的空间域转换降低了USCT分辨率.
研究的目的:
- 调查SDPW特性及其对USCT图像分辨率的影响.
- 引入一个指标来量化分辨率降解和优化USCT成像.
主要方法:
- 分析了SDPW对超声波频率和元素位置的依赖性.
- 开发了空间域脉冲宽度扩展因子 (SDPWBF) 来量化分辨率恶化.
- 使用数值模拟,单散射器幻影和体内实验验的验证结果.
主要成果:
- SDPWBF受到超声波频率和元素几何学的影响.
- 较小的SDPWBF值与更好的图像分辨率相关.
- 收发元件之间的距离较短,导致SDPWBF较小.
- SDPWBF有效地预测了USCT空间分辨率和SNR.
结论:
- 在USCT中,SDPWBF是选择最佳传感器对的有价值指标.
- 通过元素定位将SDPWBF最小化,可以提高USCT图像质量和SNR.
- 这项研究提供了一种方法来改进基于CRA的USCT系统中的解决方案.
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