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About

Iori Sumida is a medical physicist whose research centers on robotic radiosurgery, real-time tumor tracking, and quality assurance in radiation therapy, with a particular focus on the CyberKnife Synchrony™ Respiratory Tracking System. His most influential work has advanced the field's understanding of how respiratory motion affects treatment accuracy. His 2018 study introducing plastic scintillator-based evaluation of the Synchrony™ system (31 citations) offered a significant methodological improvement over traditional film measurements, enabling real-time temporal tracking assessment. Building on this, his 2019 investigation into respiratory phase shifts (27 citations) illuminated critical vulnerabilities in the correlation model between internal targets and external surrogate markers. Sumida has also made notable contributions to prostate cancer radiosurgery, quantifying the dosimetric consequences of intra-fraction prostate motion during CyberKnife treatment (15 citations), and developed a robust measurement framework for delivery quality assurance using a novel potential error concept (11 citations). His earlier work on minimum jerk model analysis established reference respiratory waveforms to minimize mechanical stress during tracking. Collectively, Sumida's research provides clinicians and physicists with practical tools to improve the precision, safety, and reliability of image-guided radiotherapy for thoracic, hepatic, and prostate tumors.