在低剂量计算机断层扫描成像中对图像质量的定量分析,用于COVID-19患者的成像
Behrooz Ghane1, Alireza Karimian1, Samaneh Mostafapour2
1Department of Biomedical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran.
Journal of medical signals and sensors
|July 14, 2023
概括
低剂量计算机断层扫描 (CT) 成像可以减少COVID-19患者的辐射暴露. 双边过器有效地消除了20%的剂量CT扫描,平衡图像质量和安全性.
科学领域:
- 放射学 放射学是一门学科.
- 医疗成像医学成像
- 计算成像技术的成像
背景情况:
- 计算机断层扫描 (CT) 扫描对于诊断和监测COVID-19进展至关重要.
- 在CT成像中减少辐射剂量至关重要,以最大限度地减少患者的暴露.
- 低剂量CT (LDCT) 引入了显著的图像噪声,挑战了诊断准确性.
研究的目的:
- 在模拟的低剂量CT图像上评估不同脱雾过器的有效性.
- 为了确定COVID-19评估的最佳低剂量CT参数.
- 在不同剂量级和过技术中比较图像质量和降噪.
主要方法:
- 在49名COVID-19患者中模拟了标准CT的四个降低剂量水平 (60%,40%,20%,10%),使用酒-兰伯特定律.
- 在低剂量CT图像上应用了高斯式,双边式和中间式无色化波器.
- 使用峰值信号噪声比率,RMSE,SSIM和相对CT值偏差来评估图像质量.
主要成果:
- 10%剂量CT图像显示质量很差,即使在无声化后 (RMSE = 322.1 ± 104.0 HU,偏差 = 11.44% ± 4.49%在肺部).
- 双边波器在噪声抑制和信号恢复方面表现优于高斯波器和中间波器.
- 对于20%的剂量CT,双边过器实现了RMSE为100.21 ± 16.47 HU,肺部区域偏差为-0.21% ± 1.2%.
结论:
- 20%剂量CT成像与双边过相结合,在降低患者剂量和可接受的图像质量之间提供了良好的平衡.
- 这种方法对诊断和分类COVID-19有希望,同时最大限度地降低辐射风险.
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