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Locating X-ray coronary angiogram keyframes via long short-term spatiotemporal attention with image-to-patch contrastive learning
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  • Ruipeng Zhang ,
  • Binjie Qin ,
  • Song Ding ,
  • Yueqi Zhu ,
  • Xu Chen ,
  • Yisong Lv
Ruipeng Zhang
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Binjie Qin
School of Biomedical Engineering, School of Biomedical Engineering

Corresponding Author:[email protected]

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Song Ding
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Yueqi Zhu
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Yisong Lv
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Locating the start, apex and end keyframes of moving contrast agents for keyframe counting in X-ray coronary angiography (XCA) is very important for the diagnosis and treatment of cardiovascular diseases. To locate these keyframes from the class-imbalanced and boundary-agnostic foreground vessel actions that overlap complex backgrounds, we propose long short-term spatiotemporal attention by integrating a convolutional long short-term memory (CLSTM) network into a multiscale Transformer to learn the segment- and sequence-level dependencies in the consecutive-frame-based deep features. Image-to-patch contrastive learning is further embedded between the CLSTM-based long-term spatiotemporal attention and Transformer-based short-term attention modules. The imagewise contrastive module reuses the long-term attention to contrast image-level foreground/background of XCA sequence, while patchwise contrastive projection selects the random patches of backgrounds as convolution kernels to project foreground/background frames into different latent spaces. A new XCA video dataset is collected to evaluate the proposed method. The experimental results show that the proposed method achieves a mAP (mean average precision) of 72.45\% and a F-score of 0.8296, considerably outperforming the state-of-the-art methods. The source code and dataset are available at https://github.com/Binjie-Qin/STA-IPCon.
2023Published in IEEE Transactions on Medical Imaging on pages 1-1. 10.1109/TMI.2023.3286859