《计算机应用》唯一官方网站 ›› 2026, Vol. 46 ›› Issue (8): 2660-2667.DOI: 10.11772/j.issn.1001-9081.2025070817
• 多媒体计算与计算机仿真 • 上一篇
收稿日期:2025-07-22
修回日期:2025-09-25
接受日期:2025-09-25
发布日期:2025-11-05
出版日期:2026-08-10
通讯作者:
乔志伟
作者简介:白杰龙(2000—),男,山西吕梁人,硕士研究生,主要研究方向:医学图像重建、图像处理基金资助:
Jielong BAI, Chenyun FANG, Zhiwei QIAO(
)
Received:2025-07-22
Revised:2025-09-25
Accepted:2025-09-25
Online:2025-11-05
Published:2026-08-10
Contact:
Zhiwei QIAO
About author:BAI Jielong, born in 2000, M. S. candidate. His research interests include medical image reconstruction, image processing.Supported by:摘要:
稀疏计算机断层成像(CT)重建能够降低患者的辐射剂量,对临床诊断具有重要意义。在基于深度学习的图像重建任务中,经典的Uformer (U-shape Transformer)、Restormer (Restoration Transformer)和AST (Adaptive Sparse Transformer)等网络未考虑图像的多尺度与方向信息,从而忽略了局部细节和全局结构的平衡,伪影抑制效果有限。针对上述问题,提出一种多尺度注意力自适应融合Transformer(MAAF-Transformer)网络。该网络采用并行注意力融合策略,结合多尺度通道方向感知注意力(MSCDA)模块捕获伪影特征,并利用卷积自适应空间通道注意力(CASCA)模块动态调节权重,然后通过门控深度卷积前馈网络(GDFN)筛选有效信息。实验结果表明,在60个稀疏角度下,MAAF-Transformer相较于经典Uformer在峰值信噪比(PSNR)上提高了0.714 1 dB、结构相似性(SSIM)上提高了0.33%,而均方根误差(RMSE)上降低了7.76%,并在视觉效果上同样表现优异。可见,MAAF-Transformer的稀疏重建精度更高,抑制伪影能力更强。
中图分类号:
白杰龙, 方晨韵, 乔志伟. 基于多尺度注意力自适应融合的稀疏CT伪影抑制Transformer网络[J]. 计算机应用, 2026, 46(8): 2660-2667.
Jielong BAI, Chenyun FANG, Zhiwei QIAO. Sparse CT artifact suppresion Transformer network based on multi-scale attention adaptive fusion[J]. Journal of Computer Applications, 2026, 46(8): 2660-2667.
| 模型 | 15视角 | 30视角 | ||||
|---|---|---|---|---|---|---|
| PSNR/dB | SSIM | RMSE | PSNR/dB | SSIM | RMSE | |
| DnCNN[ | 28.321 6 | 0.841 9 | 0.038 9 | 31.739 8 | 0.893 0 | 0.026 2 |
| RED-CNN[ | 29.372 6 | 0.866 7 | 0.034 3 | 32.765 7 | 0.907 7 | 0.023 2 |
| U-Net[ | 31.516 3 | 0.892 5 | 0.026 9 | 35.082 4 | 0.928 2 | 0.017 8 |
| FBPConvNet[ | 31.642 5 | 0.893 6 | 0.026 5 | 35.422 0 | 0.930 9 | 0.017 2 |
| Uformer[ | 32.022 9 | 0.898 0 | 0.025 3 | 35.683 7 | 0.934 6 | 0.016 6 |
| Restormer[ | 31.981 3 | 0.898 1 | 0.025 5 | 35.734 0 | 0.934 1 | 0.016 5 |
| AST[ | 32.340 5 | 0.894 4 | 0.024 4 | 35.972 6 | 0.935 8 | 0.015 9 |
| MAAF⁃Transformer | 32.9030 | 0.9075 | 0.0229 | 36.3056 | 0.938 4 | 0.015 5 |
| 模型 | 60视角 | 90视角 | ||||
| PSNR/dB | SSIM | RMSE | PSNR/dB | SSIM | RMSE | |
| DnCNN[ | 33.849 0 | 0.932 9 | 0.020 6 | 35.467 9 | 0.950 4 | 0.017 1 |
| RED-CNN[ | 35.417 3 | 0.944 3 | 0.017 1 | 36.630 3 | 0.956 7 | 0.014 9 |
| U-Net[ | 37.946 0 | 0.953 8 | 0.012 8 | 39.175 6 | 0.962 5 | 0.011 1 |
| FBPConvNet[ | 38.565 8 | 0.956 9 | 0.011 9 | 39.715 2 | 0.964 0 | 0.010 5 |
| Uformer[ | 38.795 2 | 0.959 1 | 0.011 6 | 39.992 4 | 0.965 8 | 0.010 1 |
| Restormer[ | 39.013 5 | 0.959 5 | 0.011 3 | 40.256 7 | 0.966 7 | 0.009 8 |
| AST[ | 39.213 6 | 0.960 7 | 0.011 1 | 40.424 7 | 0.967 3 | 0.009 7 |
| MAAF⁃Transformer | 39.509 3 | 0.962 3 | 0.010 7 | 40.521 9 | 0.967 7 | 0.0095 |
表1 不同稀疏角度下不同模型在测试集上的实验结果
Tab. 1 Experimental results of different models on test set under different sparse angles
| 模型 | 15视角 | 30视角 | ||||
|---|---|---|---|---|---|---|
| PSNR/dB | SSIM | RMSE | PSNR/dB | SSIM | RMSE | |
| DnCNN[ | 28.321 6 | 0.841 9 | 0.038 9 | 31.739 8 | 0.893 0 | 0.026 2 |
| RED-CNN[ | 29.372 6 | 0.866 7 | 0.034 3 | 32.765 7 | 0.907 7 | 0.023 2 |
| U-Net[ | 31.516 3 | 0.892 5 | 0.026 9 | 35.082 4 | 0.928 2 | 0.017 8 |
| FBPConvNet[ | 31.642 5 | 0.893 6 | 0.026 5 | 35.422 0 | 0.930 9 | 0.017 2 |
| Uformer[ | 32.022 9 | 0.898 0 | 0.025 3 | 35.683 7 | 0.934 6 | 0.016 6 |
| Restormer[ | 31.981 3 | 0.898 1 | 0.025 5 | 35.734 0 | 0.934 1 | 0.016 5 |
| AST[ | 32.340 5 | 0.894 4 | 0.024 4 | 35.972 6 | 0.935 8 | 0.015 9 |
| MAAF⁃Transformer | 32.9030 | 0.9075 | 0.0229 | 36.3056 | 0.938 4 | 0.015 5 |
| 模型 | 60视角 | 90视角 | ||||
| PSNR/dB | SSIM | RMSE | PSNR/dB | SSIM | RMSE | |
| DnCNN[ | 33.849 0 | 0.932 9 | 0.020 6 | 35.467 9 | 0.950 4 | 0.017 1 |
| RED-CNN[ | 35.417 3 | 0.944 3 | 0.017 1 | 36.630 3 | 0.956 7 | 0.014 9 |
| U-Net[ | 37.946 0 | 0.953 8 | 0.012 8 | 39.175 6 | 0.962 5 | 0.011 1 |
| FBPConvNet[ | 38.565 8 | 0.956 9 | 0.011 9 | 39.715 2 | 0.964 0 | 0.010 5 |
| Uformer[ | 38.795 2 | 0.959 1 | 0.011 6 | 39.992 4 | 0.965 8 | 0.010 1 |
| Restormer[ | 39.013 5 | 0.959 5 | 0.011 3 | 40.256 7 | 0.966 7 | 0.009 8 |
| AST[ | 39.213 6 | 0.960 7 | 0.011 1 | 40.424 7 | 0.967 3 | 0.009 7 |
| MAAF⁃Transformer | 39.509 3 | 0.962 3 | 0.010 7 | 40.521 9 | 0.967 7 | 0.0095 |
图8 60视角下的消融实验中腹部CT图像重建结果及其局部放大图
Fig. 8 Reconstruction results and local magnification of abdominal CT images in ablation experiments at 60 sparse angles
| 模型 | PSNR/dB | SSIM | RMSE |
|---|---|---|---|
| No GDFN | 39.201 4 | 0.960 9 | 0.011 1 |
| No CASCA | 39.242 5 | 0.960 8 | 0.011 1 |
| No MSCDA | 39.264 3 | 0.960 9 | 0.011 0 |
| MAAF⁃Transformer | 39.509 3 | 0.962 3 | 0.010 7 |
表2 60视角下的消融实验在测试集上的结果
Tab. 2 Ablation experimental results on test set at 60 sparse angles
| 模型 | PSNR/dB | SSIM | RMSE |
|---|---|---|---|
| No GDFN | 39.201 4 | 0.960 9 | 0.011 1 |
| No CASCA | 39.242 5 | 0.960 8 | 0.011 1 |
| No MSCDA | 39.264 3 | 0.960 9 | 0.011 0 |
| MAAF⁃Transformer | 39.509 3 | 0.962 3 | 0.010 7 |
图9 60视角下CASCA模块与MSCDA模块交互范式的肺部CT图像重建结果及其局部放大
Fig. 9 Reconstruction results and local magnification of lung CT images using interaction paradigms between CASCA module and MSCDA module at 60 sparse angles
| 模块 | PSNR/dB | SSIM | RMSE |
|---|---|---|---|
| SMC | 39.209 4 | 0.960 5 | 0.011 1 |
| SCM | 39.423 0 | 0.961 8 | 0.010 8 |
| MAAF⁃Transformer | 39.509 3 | 0.962 3 | 0.010 7 |
表3 60视角下CASCA模块与MSCDA模块交互范式在测试集上的实验结果
Tab. 3 Experimental results of interaction paradigms between CASCA module and MSCDA module on test set at 60 sparse angles
| 模块 | PSNR/dB | SSIM | RMSE |
|---|---|---|---|
| SMC | 39.209 4 | 0.960 5 | 0.011 1 |
| SCM | 39.423 0 | 0.961 8 | 0.010 8 |
| MAAF⁃Transformer | 39.509 3 | 0.962 3 | 0.010 7 |
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