17/12/2025
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Published Today December 16, 2025 - This meta-analysis evaluates the diagnostic accuracy of the prompt gamma-to-neutron ratio for real-time monitoring of proton beam range during cancer treatments, analyzing various detector systems.
TITLE: DIAGNOSTIC ACCURACY OF PROMPT GAMMA-TO-NEUTRON RATIO FOR PROTON BEAM RANGE VERIFICATION: A SYSTEMATIC REVIEW AND META-ANALYSIS
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Ό Link: https://doi.org/10.1038/s41598-025-28563-9
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Ό Key Findings:
β’ The study confirms that the prompt gamma-to-neutron ratio (PGNR) is a highly reliable metric for real-time range verification in proton therapy, showing high sensitivity across different studies.
β’ Meta-analysis results indicate a pooled sensitivity of 0.92 and specificity of 0.89, suggesting robust performance in detecting deviations in the proton beamβs Bragg peak position during delivery.
β’ The research highlights that secondary radiationβspecifically prompt gammas and neutronsβprovides a non-invasive signature that can be captured to ensure the beam stops precisely at the tumor.
β’ Various detector geometries were compared, with liquid scintillators and high-purity germanium detectors showing the most promising results for clinical integration and timing resolution.
β’ Heterogeneity among studies was noted due to varying phantom materials and beam energies, but the overall diagnostic odds ratio remains high, supporting the clinical potential of PGNR.
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Ό Clinical Relevance
This research is vital for improving the precision of proton therapy. By accurately verifying the beam range in real-time, clinicians can reduce margins around tumors, sparing healthy surrounding tissue and critical organs from unnecessary radiation. This minimizes side effects and improves the therapeutic index for cancer patients undergoing advanced radiotherapy treatments.
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