基于斜孔散射校正板的锥束X射线CT散射校正方法

郭成龙; 倪培君; 齐子诚; 付康

doi:10.11884/HPLPB202436.230362

基于斜孔散射校正板的锥束X射线CT散射校正方法

doi: 10.11884/HPLPB202436.230362

中国兵器科学研究院（宁波分院），浙江宁波 315000

基金项目: 国家重点研发计划项目(2022YFB602500)；国家高技术发展计划项目

详细信息

作者简介:
郭成龙，1065337899@qq.com

通讯作者:
倪培君，nipeijun@vip.sina.com。

中图分类号: TP391.41
计量
- 文章访问数: 295
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- PDF下载量: 40
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-20
- 修回日期: 2024-04-12
- 录用日期: 2024-04-02
- 网络出版日期: 2024-04-28
- 刊出日期: 2024-05-31

Scattering correction method for cone-beam X-ray CT based on slanted-hole scattering correction plate

The Ningbo Branch of Ordnance Science Institute of China, Ningbo 315000, China

摘要

摘要: 锥束X射线CT和二维扇束、平行束CT系统相比具有扫描速度快、射线利用率高、重建图像轴向分辨率和水平分辨率一致等优点，是当前工业CT技术发展的重点。然而，由于散射线的存在，其成像质量受到影响。为了减小散射线对图像质量的影响，提出一种新的基于斜孔散射校正板的散射校正方法，对该方法的原理和实现进行了深入的研究，通过获取原始扫描数据以及斜孔散射校正板后的扫描数据，利用插值和平滑处理的方法获得散射场数据。然后，通过将原始数据减去散射场数据后进行重建，即可得到无散射的CT图像。通过与光栅式散射校正板校正方法进行对比，结果表明，该方法应用于涡轮叶片的锥束CT扫描结果校正，典型区域（叶片内冷却通道及叶片内壁）对比度噪声比分别提升了14.2%和56.8%，而光栅式散射校正板校正后，同一位置对比度噪声比分别仅提升了5.6%和27.6%，验证了基于斜孔散射校正板散射校正方法的优越性。
- X射线 /
- 锥束计算机断层扫描 /
- 散射校正 /
- 伪像 /
- 斜孔散射校正板
Abstract: Compared with two-dimensional fan-beam and parallel-beam CT systems, cone-beam X-ray CT has advantages such as fast scanning speed, high X-ray utilization efficiency, consistent axial and horizontal resolution of reconstructed images, and is the focus of current industrial CT technology development. However, the imaging quality is affected by the presence of scattered radiation. To reduce the impact of scattered radiation on image quality, this paper proposes a new scatter correction method based on a slanted-hole scatter correction plate. The principle and implementation of this method are thoroughly investigated. By acquiring the raw scan data and the scan data after using the slanted-hole scatter correction plate, scatter field data is obtained using interpolation and smoothing techniques. Then, by subtracting the scatter field data from the original data and performing reconstruction, scatter-free CT images can be obtained. Compared with the grating-based scatter correction plate method, the results show that in cone-beam CT scans of turbine blades, the contrast-to-noise ratio of typical regions (the cooling channels within the blades and the inner walls of the blades) is improved by 14.2% and 56.8% respectively with the slanted-hole scatter correction plate method, whereas with the grating-based scatter correction plate method, the same positions only show an improvement of 5.6% and 27.6% respectively. This validates the superiority of the slanted-hole scatter correction plate scatter correction method.
- X-ray /
- cone-beam computed tomography /
- scatter correction /
- artifacts /
- slanted-hole scatter correction plate

HTML全文

图 1 针对锥束CT的成像系统几何图形的说明

Figure 1. Illustration of imaging system geometry for cone-beam X-ray (CBCT) CT

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图 2 散射校正步骤示意图

Figure 2. Scatter correction procedure diagram

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图 3 校正板投影信息

Figure 3. Projection information of the correction plate

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图 4 插值过程示意图

Figure 4. Interpolation process schematic diagram

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图 5 图像处理流程图

Figure 5. Flow chart of image processing

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图 6 CT系统外观

Figure 6. Appearance of the CT

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图 7 CT散射估计

Figure 7. CT scattering estimation

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图 8 沿A₁、A₂的灰度值图像

Figure 8. Gray value images along A₁ and A₂

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图 9 沿A₂方向两幅DR图像校正前后的灰度值图像

Figure 9. Grayscale images of two DR images along A₂ direction

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图 10 重建后图像

Figure 10. Reconstructed images

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图 11 校正前后切片图

Figure 11. Tomographic images before and after correction

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表 1 校正板几何参数

Table 1. Correction plate geometry parameters

width of calibration plate/mm	calibration plate height/mm	calibration plate thickness/mm	hole diameter/mm	vertical hole spacing/mm	horizontal hole spacing/mm
400	400	20	4	9.2	5.3

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表 2 扫描参数

Table 2. Scanning parameters

scanning voltage/kV	scanning current/μA	focus size/mm	image size/(pixel×pixel)	FOD/mm	FDD/mm
260	180	0.4	2000×2000	149	807

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表 3 校正前后切片图像对比度噪声比

Table 3. R_CNof tomographic images before and after correction

correction method	origin R_CN		R_CN improvement ratio/%
correction method	area a	area b	area a	area b
pre-correction	30.3	7	/	/
after slanted-hole correction	35.3	16.2	14.2	56.8
after raster correction	32.1	9.7	5.6	27.6

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