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CycleGAN for interpretable online EMT compensation
International Journal of Computer Assisted Radiology and Surgery ( IF 2.3 ) Pub Date : 2021-03-14 , DOI: 10.1007/s11548-021-02324-1
Henry Krumb 1 , Dhritimaan Das 2 , Romol Chadda 1 , Anirban Mukhopadhyay 1
Affiliation  

Purpose

Electromagnetic tracking (EMT) can partially replace X-ray guidance in minimally invasive procedures, reducing radiation in the OR. However, in this hybrid setting, EMT is disturbed by metallic distortion caused by the X-ray device. We plan to make hybrid navigation clinical reality to reduce radiation exposure for patients and surgeons, by compensating EMT error.

Methods

Our online compensation strategy exploits cycle-consistent generative adversarial neural networks (CycleGAN). Positions are translated from various bedside environments to their bench equivalents, by adjusting their z-component. Domain-translated points are fine-tuned on the x–y plane to reduce error in the bench domain. We evaluate our compensation approach in a phantom experiment.

Results

Since the domain-translation approach maps distorted points to their laboratory equivalents, predictions are consistent among different C-arm environments. Error is successfully reduced in all evaluation environments. Our qualitative phantom experiment demonstrates that our approach generalizes well to an unseen C-arm environment.

Conclusion

Adversarial, cycle-consistent training is an explicable, consistent and thus interpretable approach for online error compensation. Qualitative assessment of EMT error compensation gives a glimpse to the potential of our method for rotational error compensation.



中文翻译:


CycleGAN 用于可解释的在线 EMT 补偿


 目的


电磁跟踪 (EMT) 可以部分取代微创手术中的 X 射线引导,减少手术室中的辐射。然而,在这种混合环境中,EMT 受到 X 射线设备引起的金属变形的干扰。我们计划通过补偿 EMT 误差,使混合导航临床成为现实,以减少患者和外科医生的辐射暴露。

 方法


我们的在线补偿策略利用循环一致的生成对抗神经网络(CycleGAN)。通过调整 z 分量,可以将位置从各种床边环境转换为相应的工作台环境。域平移点在 x-y 平面上进行微调,以减少工作台域中的误差。我们在虚拟实验中评估了我们的补偿方法。

 结果


由于域转换方法将扭曲点映射到其实验室等效点,因此预测在不同的 C 臂环境中是一致的。在所有评估环境中都成功减少了错误。我们的定性模型实验表明,我们的方法可以很好地推广到不可见的 C 形臂环境。

 结论


对抗性、周期一致的训练是一种可解释、一致且可解释的在线误差补偿方法。 EMT 误差补偿的定性评估让我们一睹我们的旋转误差补偿方法的潜力。

更新日期:2021-03-15
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