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A Systematic Review of Segmentation and Classification Techniques for Lung Cancer Detection on LDCT Scan Images

Umesh Kumar, Gagan Thakral, Sapna Gambhir

International Journal of Research Publication and Reviews, 2025

Abstract

Lung cancer is the leading cause of cancer-related deaths worldwide, with late-stage diagnosis and limited treatment options being the primary reasons for this outcome.Low-dose computed tomography (LDCT) has been established as the preferred imaging technique for early-stage detection and screening, offering higher sensitivity in identifying lung nodules while minimizing radiation expo-sure.However, manual interpretation of LDCT scans is labor-intensive, prone to errors, and suffers from inter-observer variability, underscoring the need for robust computer-aided diagnosis (CAD) systems.In recent years, various seg-mentation and classification techniques have been explored and proposed for the accurate, efficient, and reliable detection of lung cancer.This paper provides a comprehensive review of traditional image processing, machine learning, and deep learning-based methods for segmentation and classification of lung nodules on LDCT images.It discusses the strengths, limitations, and comparative perfor-mance of existing approaches and also delves into emerging trends such as hybrid CAD systems, transfer learning, attention mechanisms, and real-time detection frameworks like YOLOv8.Finally, this review paper also sheds light on existing challenges like false positives, data imbalance, and interpretability issues.Fur-thermore, it envisions potential directions for future research to develop clinically viable and explainable AI-driven lung cancer detection systems.

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