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arXiv 2007.04928cs.CV
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基于师生知识转移的快速光流患者特定领域自适应

Patient-Specific Domain Adaptation for Fast Optical Flow Based on Teacher-Student Knowledge Transfer

Leibniz Universität Hannover(汉诺威莱布尼茨大学)

Sontje Ihler, Max-Heinrich Laves, Tobias Ortmaier

摘要:

快速运动反馈在移动组织的计算机辅助手术(CAS)中至关重要。安全关键视觉应用中的图像辅助需要对组织运动进行密集跟踪。这可以使用光流(OF)来完成。高处理速率下的准确运动预测可提高患者安全性。当前的深度学习OF模型显示了常见的速度与准确性的权衡。为了在高处理速率下实现高精度,我们提出了对快速模型进行患者特定的微调。这最大限度地减少了训练和应用数据之间的域差距,同时将目标域减少到较低复杂度的快速模型的能力。我们建议在手术室术前获得训练序列。我们通过师生学习来处理缺失的地面事实。使用教师模型FlowNet2的流量估计,我们在患者特定领域专门设计了一个快速学生模型FlowNet2S。对来自Hamlyn数据集的序列进行评价。我们的学生模型在微调后表现出非常好的性能。跟踪精度与教师模型相当,速度提高了6倍。可在几分钟内进行微调,使其适用于手术室。我们的方法允许使用以前不适合这项任务的实时模型。该方法为CAS中改进的患者特异性运动估计奠定了基础。

英文摘要:

Fast motion feedback is crucial in computer-aided surgery (CAS) on moving tissue. Image-assistance in safety-critical vision applications requires a dense tracking of tissue motion. This can be done using optical flow (OF). Accurate motion predictions at high processing rates lead to higher patient safety. Current deep learning OF models show the common speed vs. accuracy trade-off. To achieve high accuracy at high processing rates, we propose patient-specific fine-tuning of a fast model. This minimizes the domain gap between training and application data, while reducing the target domain to the capability of the lower complex, fast model. We propose to obtain training sequences pre-operatively in the operation room. We handle missing ground truth, by employing teacher-student learning. Using flow estimations from teacher model FlowNet2 we specialize a fast student model FlowNet2S on the patient-specific domain. Evaluation is performed on sequences from the Hamlyn dataset. Our student model shows very good performance after fine-tuning. Tracking accuracy is comparable to the teacher model at a speed up of factor six. Fine-tuning can be performed within minutes, making it feasible for the operation room. Our method allows to use a real-time capable model that was previously not suited for this task. This method is laying the path for improved patient-specific motion estimation in CAS.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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