High-sensitivity research refers to the study of detecting and measuring extremely small quantities or changes in a system. This research area often focuses on developing advanced technologies and methodologies to improve the detection limits of various analytical techniques, such as sensors, imaging systems, and detection systems. High-sensitivity research can have applications in various fields, including medical diagnostics, environmental monitoring, and security screening. By being able to detect minute changes in a system, researchers can better understand complex processes and potentially identify early indicators of diseases or other issues.