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Enhanced accuracy with Segmentation of Colorectal Polyp using NanoNetB, and Conditional Random Field Test-Time

Muhammad Sajjad Hussain1, Umer Asgher2,3, Sajid Nisar4

  • 1Department of Computer Science, Sir Syed (CASE) Institute of Technology, Islamabad, Pakistan.

Frontiers in Robotics and AI
|August 26, 2024
PubMed
Summary

This study introduces an Enhanced Nanonet model for precise, real-time polyp segmentation in colonoscopy images, significantly reducing missed detections. The lightweight model improves accuracy, especially for small polyps, aiding early colorectal cancer prevention.

Keywords:
colonoscopycolorectal cancerconditional random fieldlightweight deep learning modelspolyp segmentationtest-time augmentation

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Area of Science:

  • Medical Imaging
  • Artificial Intelligence in Medicine
  • Gastroenterology

Background:

  • Colonoscopy is crucial for early colorectal polyp detection and cancer prevention.
  • Current colonoscopy techniques suffer from high polyp miss rates due to challenges like polyp shape, size, and resemblance to surrounding tissues.
  • Existing deep learning models for polyp segmentation are often too complex for real-time clinical application, requiring lightweight and efficient solutions.

Purpose of the Study:

  • To develop a novel, lightweight, and generalized Enhanced Nanonet model for accurate, real-time polyp segmentation in colonoscopy images.
  • To improve upon the Nanonet architecture using NanonetB, incorporating data augmentation, Conditional Random Field (CRF), and Test-Time Augmentation (TTA).
  • To address the challenges of real-time segmentation, minimal latency, and seamless integration with endoscopic hardware.

Main Methods:

  • Proposed a novel Enhanced Nanonet model, an improvement over Nanonet using NanonetB.
  • Implemented data augmentation, Conditional Random Field (CRF), and Test-Time Augmentation (TTA) to enhance model performance.
  • Evaluated the model on six diverse, publicly available colonoscopy datasets (Kvasir-SEG, Endotect Challenge 2020, Kvasir-instrument, CVC-ClinicDB, CVC-ColonDB, CVC-300) for generalizability.

Main Results:

  • Achieved a mean Intersection over Union (mIoU) of 0.8188 and a Dice coefficient of 0.8060 on the Kvasir-SEG dataset.
  • The Enhanced Nanonet model has only 132,049 parameters, requiring minimal computational resources.
  • Demonstrated improved performance in detecting smaller and sessile (flat) polyps, which are often missed in standard examinations.

Conclusions:

  • The proposed Enhanced Nanonet model offers a lightweight and generalized solution for precise, real-time polyp segmentation in colonoscopy.
  • The integration of CRF and TTA significantly enhances segmentation performance across different datasets, validating its generalizability.
  • This model has the potential to reduce miss rates in colonoscopy, thereby improving early detection and prevention of colorectal cancer.