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- W2889102373 abstract "Abstract Background Adaptive radiation therapy ( ART ) “flags,” such as change in external body contour or relative weight loss, are widely used to identify which head and neck cancer ( HNC ) patients may benefit from replanned treatment. Despite the popularity of ART , few published quantitative approaches verify the accuracy of replan candidate identification, especially with regards to the simple flagging approaches that are considered current standard of practice. We propose a quantitative evaluation framework, demonstrated through the assessment of a single institution's clinical ART flag: change in body contour exceeding 1.5 cm. Methods Ground truth replan criteria were established by surveying HNC radiation oncologists. Patient‐specific dose deviations were approximated by using weekly acquired CBCT images to deform copies of the CT simulation, yielding during treatment “synthetic CT s.” The original plan reapplied to the synthetic CT s estimated interfractional dose deposition and truth table analysis compared ground truth flagging with the clinical ART metric. This process was demonstrated by assessing flagged fractions for 15 HNC patients whose body contour changed by >1.5 cm at some point in their treatment. Results Survey results indicated that geometric shifts of high‐dose volumes relative to image‐guided radiation therapy alignment of bony anatomy were of most interest to HNC physicians. This evaluation framework successfully identified a fundamental discrepancy between the “truth” criteria and the body contour flagging protocol selected to identify changes in central axis dose. The body contour flag had poor sensitivity to survey‐derived major violation criteria (0%–28%). The sensitivity of a random sample for comparable violation/flagging frequencies was 27%. Conclusions These results indicate that centers should establish ground truth replan criteria to assess current standard of practice ART protocols. In addition, more effective replan flags may be tested and identified according to the proposed framework. Such improvements in ART flagging may contribute to better clinical resource allocation and patient outcome." @default.
- W2889102373 created "2018-09-07" @default.
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- W2889102373 date "2018-08-29" @default.
- W2889102373 modified "2023-10-05" @default.
- W2889102373 title "Framework for the quantitative assessment of adaptive radiation therapy protocols" @default.
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- W2889102373 doi "https://doi.org/10.1002/acm2.12437" @default.
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