Lung cancer remains a leading cause of cancer-related mortality, underscoring the urgent need for accurate and early detection to improve patient outcomes. However, current detection systems often struggle with issues like elevated false-positive rates and insufficient feature extraction. These challenges largely stem from the visual resemblance between nodules and nearby tissues, as well as the inability of conventional models to effectively capture the complex features of pulmonary nodules. This research presents a deep learning-based approach for identifying lung nodules in CT images. The framework incorporates advanced preprocessing steps such as Gaussian filtering and Contrast Limited Adaptive Histogram Equalization to enhance image sharpness and overall visual quality. A Residual Pyramid Attention-Enhanced DenseNet201, integrated with SE and CBAM modules, is used for effective feature extraction, while a sigmoid function supports binary classification. Hyperparameter tuning is performed using a novel optimizer based on Latin Hypercube Sampling and Mean Differential Variation. Evaluated on LUNA16 dataset with 888 CT scans, the model reached 98.7 % accuracy, 99.2 % sensitivity, and a 95.38 % F1-score on the test set. The framework significantly reduces false positives and demonstrates strong generalization for clinical lung cancer identification.
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