Chen M H, Wang T, Yuan Y, et al. Study on retinal OCT segmentation with dual-encoder[J]. Opto-Electron Eng, 2023, 50(10): 230146. doi: 10.12086/oee.2023.230146
Citation: Chen M H, Wang T, Yuan Y, et al. Study on retinal OCT segmentation with dual-encoder[J]. Opto-Electron Eng, 2023, 50(10): 230146. doi: 10.12086/oee.2023.230146

Study on retinal OCT segmentation with dual-encoder

    Fund Project: Project supported by Shanghai Science and Technology Commission Industry-university-research Medical Project (15DZ1940400)
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  • There are noises and speckles in OCT retinal images, and a single extraction of spatial features is often easy to miss some important information. Therefore, the target region cannot be accurately segmented. OCT images themselves have spectral frequency domain characteristics. Aiming at the frequency domain characteristics of OCT images, this paper proposes a new dual encoder model based on U-Net and fast Fourier convolution to improve the segmentation performance of the retinal layer and liquid in OCT images. The proposed frequency encoder can extract image frequency domain information and convert it into spatial information through fast Fourier convolution. The lack of feature information that can be omitted by a single space encoder will be well-complemented. After comparison with other classical models and ablation experiments, the results show that with the addition of a frequency domain encoder, the model can effectively improve the segmentation performance of the retinal layer and liquid. Both average Dice coefficient and mIoU are increased by 2% compared with U-Net. They are increased by 8% and 4% compared with ReLayNet, respectively. Among them, the improvement of liquid segszmentation is particularly obvious, and the Dice coefficient is increased by 10% compared with the U-Net model.
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  • Deep learning methods have already had a profound impact on medical image processing. However, some noises and speckles contained in OCT images affect the quality of the images, coupled with the elongated and complex retinal layer and the irregular distribution of pathological fluid in it, which brings great challenges to the automatic segmentation task. At the same time, depending on the limited manpower and time, it is also difficult to sketch a large number of existing images by relying on the professional knowledge of doctors. For the above reasons, automatic medical image segmentation, a scientific medical auxiliary support, is of great clinical significance.

    The research content of this paper mainly focuses on the analysis and processing of retinal OCT images. When it comes to monitoring the state of the patient's retina layer, due to the noise and speckle in OCT images and the subtle and complex structure of the retina layer itself, the performance of the model is limited by a single extraction space feature, and the target region cannot be accurately segmented. Aiming at the frequency domain characteristics of OCT images, this paper proposes a dual encoder model based on U-Net and fast Fourier convolution to improve the segmentation performance of the retinal layer and liquid in OCT images. The frequency domain encoder extracts the image frequency domain information and converts it into spatial information by fast Fourier convolution to complete the feature extraction of a single spatial encoder. The experimental results show that the model can effectively improve the segmentation performance of the retinal layer and liquid, both average Dice coefficient and mIoU are increased by 2% compared with U-Net, and the Dice coefficient of liquid is increased by 10%.

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