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Healthcare is experiencing an unprecedented digital transformation. From electronic health records and cloud-based clinical platforms to artificial intelligence, medical IoT, and telemedicine, information technology has become central to modern healthcare delivery. While these advancements have greatly enhanced diagnostic precision, operational efficiency, and patient care, they have also introduced a critical yet often overlooked concern—the environmental impact of healthcare IT. Increasing energy consumption, rising electronic waste, carbon emissions from data centers, and the rapid obsolescence of medical technologies call for a more responsible and sustainable approach to digital healthcare. Green Computing in Medical Applications: Sustainable and Responsible Healthcare IT is developed in response to this pressing global challenge. The book seeks to bridge the gap between technological progress and environmental responsibility by positioning green computing not as a limitation, but as a catalyst for resilient, cost-effective, and future-ready healthcare systems. Sustainability is no longer an option for healthcare organizations; it has become essential for long-term viability, regulatory compliance, public trust, and global environmental accountability. This book offers a comprehensive and structured exploration of green computing principles within healthcare settings. It begins with foundational concepts and traces the evolution of healthcare IT, examining the environmental implications of conventional systems and highlighting the urgent need for sustainable alternatives. The discussion extends to energy-efficient data infrastructures, green cloud computing, virtualization, and low-power hardware solutions designed specifically for hospitals and clinical environments. Particular emphasis is placed on eco-friendly medical devices, embedded systems, and IoT-enabled healthcare solutions. Key topics such as lifecycle assessment, reduction of hazardous materials, and sustainable biomedical engineering practices are explored in depth. Additionally, the book addresses the growing issue of medical electronic waste by presenting strategies for responsible procurement, recycling, adherence to regulatory frameworks, and the adoption of circular economy models in IT asset management. Looking forward, the book examines emerging trends in sustainable healthcare IT, including green algorithms, energy-efficient AI model training, climate-responsive digital infrastructures, sustainability considerations in blockchain technologies, and pathways toward carbon-neutral healthcare systems. Through a combination of global and Indian case studies, it illustrates how these concepts can be effectively implemented in real-world scenarios. This work is intended for a diverse audience, including students, researchers, healthcare IT professionals, biomedical engineers, hospital administrators, policymakers, and sustainability advocates. By integrating technical knowledge with environmental, ethical, and regulatory perspectives, the book aims to empower readers to design and manage healthcare IT systems that are not only innovative and secure but also sustainable and socially responsible.