Abstract

Brain tumors, particularly gliomas, pose a significant threat to global health, necessitating accurate and efficient diagnostic methods. Magnetic Resonance Imaging (MRI) serves as a crucial tool for diagnosing glioma grades, but interpretation is subject to variability, hindering treatment planning. Intra and inter-observer variability in radiological image interpretation impede effective therapeutic strategies for brain tumor patients. Accessing relevant images from vast medical databases for comparison and treatment planning is cumbersome and time-consuming. This paper proposes a Content-Based Medical Image Retrieval (CBIR) system utilizing Convolutional Neural Network (CNN)-based feature extraction, specifically employing the AlexNet architecture. The system employs KNN clustering for indexing the feature map database and implements Gain-based feature selection to reduce feature vector dimensionality. The proposed system underwent evaluation using BraTS 2018 and 2020 datasets with five-fold cross-validation. Achieving state-of-the-art performance, the system demonstrated a mean Average Precision of 98% and Precision of 97%, showcasing its efficacy in accurately retrieving similar pathological MRI brain images.

Authors

N. Kanagavalli¹, Shaik Hameeda², R. Dinesh³, N. Vijayaraghavan⁴
Rajalakshmi Institute of Technology, India¹, Avanthi Institute of Engineering and Technology, India², Excel Engineering College, India³, Prathyusha Engineering College, India⁴

Keywords

Brain Tumors, Magnetic Resonance Imaging (MRI), Content-Based Image Retrieval (CBIR), Convolutional Neural Network (CNN), BraTS Dataset