What happens when every single treatment beam is monitored in real time—over 2.5 years, across all patients, all plans, and all treatment techniques?
Our customer at Teikyo University Hospital has answered this question with what is now the largest clinical beam-monitoring dataset ever published.
Key facts from the study presented at JASTRO 2025
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1,204 patients
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1,248 treatment plans
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28,821 beams
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Segment-by-segment analysis of every delivery
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Median 117 segments per plan
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Continuous IQM use in routine clinical operation
Using IQM’s gantry-mounted ionization chamber, the team performed intra-treatment beam QA for every treatment, building a statistically robust dataset that allowed them to:
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Define clinically meaningful control limits
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Detect long-term trends and stability
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Translate historical data into real-time beam QA thresholds
Most importantly, the results demonstrate exceptional beam stability across all treatment sites and techniques, including VMAT, DCAT, and SRT—
proving that IQM is not just another QA device, but a true real-time quality management system.
This work sets a new benchmark for what clinical beam monitoring at scale can look like.
Recognizing Outstanding Clinical Commitment
We would also like to explicitly acknowledge Shinobu Kumagai for his outstanding work and long-term dedication to improving radiotherapy quality and patient safety. Conducting continuous intra-treatment beam QA for every patient over more than two years—resulting in nearly 30,000 analysed beams—reflects an exceptional level of clinical commitment, scientific rigor, and responsibility toward patients. This work sets a strong example of how data-driven quality management can be successfully implemented in routine clinical practice.
Click here to download the largest clinical beam-monitoring dataset ever published.