DVH Constraint Compendium Standardizes Radiation Therapy Planning
The American Society for Radiation Oncology (ASTRO) and the U.S. Department of Veterans Affairs (VA) have published a comprehensive compendium of consensus-derived dose-volume constraint recommendations for radiation therapy planning. Approved by the ASTRO Board and endorsed by the AAPM and AAMD, the document represents the first large-scale effort to consolidate DVH (Dose-Volume Histogram) constraints for a wide selection of disease sites and fractionation schemes into a single, publicly available reference.
The problem the document addresses is well known to medical physicists and dosimetrists: finding up-to-date, publicly available, and professionally endorsed DVH metrics for different cancer types and dose regimens is a constant challenge. Recommendations are typically scattered across disease site-specific publications without a unified compendium. The result is practice variation between clinics and even among professionals within the same institution.
How the Guidelines Were Developed
The VA and ASTRO assembled panels of seven radiation oncologists, one therapeutic medical physicist from outside the VA, and one radiation oncologist within the VA. Panels were organized by disease site, and each evaluated different dose regimens. Panel members worked to build consensus on the best DVH guidelines, evaluating clinical data and multi-site trials whenever possible. When published guidance was limited, best practices were discussed as a group.
Proposed constraints were available for public comment for three weeks, allowing additional feedback from the radiation oncology community. Final guidelines passed a greater than 75% agreement threshold from the clinical panel. The ASTRO Board of Directors voted to approve the guidelines in August 2025, with subsequent endorsement by the AAPM and AAMD. The guidelines were published in early 2026.
Comprehensive Coverage: Multiple Sites and Fractionation Schemes
One of the compendium’s greatest strengths is its breadth. For a given disease site, the guidelines provide specific constraints for different fractionation schemes. For example, lung recommendations include separate tables for 3, 4, 5, 8, and more fraction regimens — eliminating the ambiguity that arises when interpolating constraints between different schemes.
The document includes recommendations for brain, head and neck, breast, lung, esophagus, stomach, pancreas, liver, rectum, prostate, bladder, gynecologic, and spine sites, among others. This breadth is especially relevant for daily treatment planning and setup in radiation therapy, where standardized constraints reduce variability and improve consistency of care.
Living Document: Continuous Updates
A crucial aspect of the compendium is that it was designed as living guidance. Panels will continue to evaluate and update the tables as new clinical evidence and practice patterns emerge. This approach recognizes that radiation therapy is a rapidly evolving specialty, where techniques like SBRT, VMAT, and proton therapy are constantly redefining what is achievable in terms of dose conformity and organ-at-risk sparing.
The living document philosophy also aligns with evolving practices in sarcoma treatment planning and pediatric brain tumor delineation, where DVH constraints must keep pace with advancing techniques and clinical evidence.
Practical Implications for Radiation Therapy Clinics
For medical physicists and dosimetrists, the compendium offers a single authoritative reference that can be directly integrated into treatment planning systems. Radformation, developer of ClearCheck software, has already released ready-to-use templates based on the new recommendations, enabling clinics to automatically evaluate plans against ASTRO/VA constraints with just a few clicks.
Standardization is especially valuable in training environments and clinics with high staff turnover, where a consensus-based, institutionally endorsed reference reduces the learning curve and minimizes planning errors.
Outlook: Global Standardization and AI
The ASTRO/VA compendium represents an important step in standardizing radiation therapy planning. As AI tools for auto-planning and automated plan evaluation become more prevalent, a publicly validated set of DVH constraints becomes essential infrastructure. AI-driven planning algorithms need clear benchmarks — and the ASTRO/VA compendium provides exactly that.
Source: Radformation Blog
