Fundus-Enhanced Disease-Aware Distillation Model for Retinal Disease Classification from OCT Images

Introduction

This is the pytorch implementation for the paper "Fundus-Enhanced Disease-Aware Distillation Model for Retinal Disease Classification from OCT Images"

Data Preparation

• Dataset

  We collect a new dataset TOPCON-MM with fundus and OCT images in xx hospital using a Topcon Triton swept-source OCT featuring multimodal fundus imaging. We have separated our in-house dataset at the patient level, maintained a training-to-test set ratio of approximately 8:2. We are dedicated to making our data publicly available.

• Data Preprocessing

  For fundus images, we used contrast-limited adaptive histogram equalization to improve image quality. For OCT images, we adopted 3x3 median filter to reduce the background noise. We utilized data augmentation including random crop, flip, rotation, and changes in contrast, saturation, and brightness. All the images are resized to 448×448 before feeding into the network.

• Structure of data folder

  image_data/
  └── topcon-mm/
      ├── train/
      │   ├── cfp.txt
      │   ├── oct.txt
      │   └── Images/
      │       ├── fundus-images/
      │       └── oct-images/
      ├── val/
      │   ├── cfp.txt
      │   └── oct.txt
      └── test/
          ├── cfp.txt
          └── oct.txt
  

Implementation

1. Check dependencies

   matplotlib==3.5.3
   numpy==1.21.5
   opencv-python==4.7.0.68
   Pillow==9.3.0
   python==3.7.10
   scikit-learn==0.24.2
   scipy==1.7.3
   torch==1.11.0
   torchcam==0.3.2
   torchvision==0.12.0
   

2. Train model

   First, we pretrained the fundus single-modal model with fundus images.

   python train_fundus.py --train_collection 'image_data/topcon-mm/train' \
                   --val_collection 'image_data/topcon-mm/val' \
                   --test_collection 'image_data/topcon-mm/test' \
                   --model_configs 'config_fundus.py' \
   

   Next, the fundus-enhanced model for OCT images is trained.

   python train.py --train_collection 'image_data/topcon-mm/train' \
                   --val_collection 'image_data/topcon-mm/val' \
                   --test_collection 'image_data/topcon-mm/test' \
                   --model_configs 'config.py' \
                   --alpha 2 \
                   --temperature 4 \
                   --beta 1 \
                   --batch_size 8 \
                   --checkpoint $pretrained_model_for_fundus
   

Citation

If this code is helpful for you, please cite:

@inproceedings{wang2023fundus,
  title={Fundus-Enhanced Disease-Aware Distillation Model for Retinal Disease Classification from OCT Images},
  author={Wang, Lehan and Dai, Weihang and Jin, Mei and Ou, Chubin and Li, Xiaomeng},
  booktitle={International Conference on Medical Image Computing and Computer-Assisted Intervention},
  pages={639--648},
  year={2023},
  organization={Springer}
}

Contact

Lehan Wang (lwangdk@connect.ust.hk), Xiaomeng Li (eexmli@ust.hk)