Applications of bioimpedance measurement in clinical and allied fields: a comprehensive review.

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Accurate and timely disease detection is essential in modern healthcare. Conventional imaging methods such as computed tomography (CT), magnetic resonance imaging (MRI), and dual-energy X-ray absorptiometry (DXA) offer valuable diagnostic information, but face significant limitations, including high cost, radiation exposure, and lengthy scan times. Electrical impedance tomography (EIT) and bioelectrical impedance analysis (BIA) have emerged as promising non-invasive, radiation-free, and cost-effective alternatives for assessing tissue properties by measuring bioimpedance-the electrical response of biological tissues influenced by cellular and molecular characteristics. Bioimpedance-based technologies measure electrical properties modulated by tissue composition, hydration, and disease-related changes. BIA, in particular, is widely used for body composition analysis, hydration status monitoring, and disease management in contexts such as oncology, diabetes, nephrology, cardiopulmonary function, fitness, and wound healing. Further, EIT can be used to generate tomographic images through surface electrode arrays, facilitating internal tissue visualization. Technological advances such as multi-frequency bioimpedance spectroscopy, wearable and portable devices, and integration with machine learning algorithms can further improve diagnostic accuracy and functional utility. Applications have broadened beyond clinical settings to include non-medical fields like agriculture, robotics, and material science. However, challenges persist, including methodological limitations, biological and environmental variability, electrode design, and limited penetration depth. Standardizing protocols, population-specific calibration equations, and cross-validation with gold-standard imaging techniques like MRI and CT are vital to enhancing measurement reliability and clinical acceptance. Furthermore, advances in sensor technology, data analytics, and multimodal diagnostic approaches incorporating bioimpedance promise to refine disease monitoring and personalized healthcare. Bioimpedance technology is a versatile and promising diagnostic and monitoring tool, combining safety, portability, and affordability. Its ability to provide real-time, non-invasive insights across a broad spectrum of medical and non-medical applications positions it at the forefront of biomedical innovation. Continued technological advancements and rigorous validation will be essential to realize its full potential in personalized healthcare and beyond. This comprehensive review highlights the versatility of bioimpedance technology, its growing role in personalized medicine and therapy, and its potential to enhance diagnostics and patient management across various healthcare domains.

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