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Subtle Medical

Health Tech & Medtech · Menlo Park, United States · Founded 2017

Subtle Medical is a healthcare technology company that develops artificial intelligence-powered software to improve medical imaging. Spun out of Stanford University in 2017 by deep learning scientist Dr. Enhao Gong and neuroradiologist Dr. Greg Zaharchuk, the company's mission is to make medical imaging faster, safer, and smarter. The founders' collaboration began in 2016, combining Dr. Gong's expertise in AI for image enhancement with Dr. Zaharchuk's deep experience in radiology to address challenges in scan quality and efficiency. The company's core business revolves around a suite of vendor-neutral software products that integrate with existing MRI and PET scanners to enhance image quality from accelerated scans. Its main products include SubtlePET™, which improves the quality of PET scans conducted in a fraction of the original time, and a suite for MRI including SubtleMR™, SubtleHD™, and SubtleSYNTH™. These deep learning solutions denoise, sharpen, and even synthetically generate images, allowing hospitals and imaging centers to increase patient throughput, reduce patient time in the scanner, and potentially lower radiation and contrast agent doses. The technology is compatible with all major scanner manufacturers and integrates into existing clinical workflows without requiring new hardware. Subtle Medical operates primarily on a Software-as-a-Service (SaaS) business model, selling its solutions to hospitals and imaging centers globally. The company has secured over $50 million in funding through multiple rounds, including a Series A of $12.2 million and a Series B totaling over $30 million, backed by investors like Bessemer Venture Partners, Samsung Ventures, and 3E Bioventures Capital. With seven FDA clearances and CE Mark approvals, its products are used in over 600 sites worldwide, serving millions of patients annually. Keywords: medical imaging, artificial intelligence, deep learning, MRI enhancement, PET enhancement, radiology software, image reconstruction, diagnostic imaging, healthcare technology, scan time reduction, image denoising, workflow efficiency, generative AI, FDA cleared, CE mark, neuroradiology, PET/CT, MRI software, SaaS, patient throughput, medical diagnostics, imaging acquisition