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About

Izumi Koike is a medical physicist and researcher whose work centers on image-guided robotic radiosurgery, with a particular focus on respiratory motion tracking and treatment accuracy in stereotactic body radiotherapy. Working primarily with the CyberKnife Synchrony Respiratory Tracking System, Koike has made meaningful contributions to understanding the complex, patient-dependent factors that govern the precision of real-time tumor tracking during radiation delivery. Koike's most influential work, published in 2015 and accumulating 19 citations, introduced an innovative methodology using beam's eye view images to quantitatively measure respiratory motion tracking errors — a critical advancement for quality assurance in radiosurgery. This was complemented by a 2019 study (15 citations) systematically identifying clinical and physiological factors that affect tracking accuracy, providing practical guidance for treatment planning and patient selection. Earlier research from 2014 examined how residual patient motion during skull-based tracking influences dose distribution, highlighting the clinical significance of motion management even in cranial applications. Collectively, Koike's body of work offers clinicians and physicists evidence-based tools to evaluate and improve the safety and precision of robotic radiosurgery, ultimately contributing to better outcomes for patients with tumors subject to respiratory motion.