Quality Assurance in Radiation Therapy Techniques
Summary
Quality assurance in radiation therapy encompasses a systematic suite of processes designed to verify that prescribed treatments are delivered safely, accurately and reproducibly. This framework spans the calibration and maintenance of treatment machines, the validation of treatment planning systems, patient‐specific dosimetric checks and regular audits of clinical protocols. Central to these efforts is dosimetry analysis, which quantifies the radiation dose delivered to both target volumes and surrounding healthy tissues. Advances in imaging and computerised treatment planning have enabled sophisticated techniques such as intensity‐modulated radiation therapy (IMRT), volumetric modulated arc therapy (VMAT) and tomotherapy, each of which demands rigorous verification of machine parameters, beam delivery and dose calculation algorithms. Anthropomorphic phantoms, multi‐leaf collimator (MLC) performance tests and gamma index evaluations constitute key tools for assessing spatial and dosimetric accuracy. An integrated quality management system ensures that measurement uncertainties are identified and minimised, and that interdepartmental consistency is maintained globally. The evolving landscape of stereotactic body radiotherapy and flattening filter-free beam delivery further underscores the need for up-to-date commissioning guidelines and robust patient‐specific checks. Together, these practices underpin clinical confidence, optimise therapeutic outcomes and support the safe implementation of emerging technologies in diverse healthcare settings.
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Quality Assurance in Radiation Therapy Techniques publication trend
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Technical terms
Quality assurance (QA): A structured programme of checks and audits to ensure that radiation therapy is delivered safely, accurately and consistently.
Dosimetry: The measurement and calculation of the radiation dose absorbed by tissue during therapy.
Anthropomorphic phantom: A model replicating human anatomy and tissue heterogeneity, used to simulate patient treatment for QA purposes.
Multi-leaf collimator (MLC): A device composed of movable leaves that shape the radiation beam to conform to the tumour during treatment.
Gamma index: A composite metric comparing measured and planned dose distributions, combining dose difference and spatial agreement criteria.
References
- Development of an Anthropomorphic Heterogeneous Female Pelvic Phantom and Its Comparison with a Homogeneous Phantom in Advance Radiation Therapy: Dosimetry Analysis. Medical Sciences (2023).
- Influence of the Planning Parameters of a New Algorithm on the Dosimetric Quality, Beam-On Time and Delivery Accuracy of Tomotherapy Plans. Cancers (2024).
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