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Program Information

QA Fundamentals: Applications of Multi-Dimensional Arrays

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V Feygelman

S Stathakis

T Ritter




V Feygelman1*, S Stathakis2*, T Ritter3*, (1) H. Lee Moffitt Cancer Center, Tampa, FL, (2) Cancer Therapy and Research Center, San Antonio, TX, (3) The University of Michigan, Ann Arbor, MI

Presentations

SA-C-BRD-0 (Saturday, March 5, 2016) 2:00 PM - 4:00 PM Room: Grand Ballroom D


Multi-dimensional dosimetry arrays can be useful tools for commissioning of the planning/delivery chain, linear accelerator quality assurance (QA), and patient-specific end-to-end testing for intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) treatments. We will give an introduction to the available arrays on the market, examine differences between the ion chamber- and diode-based arrays, review their fundamental properties, and provide recommendations on commissioning. We will describe the place of the multi-dimensional arrays in the overall QA system, including which dose analysis techniques should be used for applications such as assessing linear accelerator performance. The inherent limitations of the 2D arrays will be discussed in comparison with the quasi-3D arrays. Applications to linear accelerator QA will include specific examples of multi-leaf collimator (MLC), output, profile and energy checks, as well as performing post-repair testing and validation with detector arrays.

Learning objectives:
1.To learn the properties of multi-dimensional arrays, their strengths and their drawbacks.
2.To understand the proper use of multi-dimensional arrays in patient specific plan QA, including 2D vs 3D array analysis.
3.To learn the difference between 3D dose reconstruction and direct application of quasi-3D arrays.
4.To learn the use of multi-dimensional arrays in linear accelerator and treatment planning quality assurance including their use for TG-142 QA.


Handouts


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