Developing a low dimensional patient class profile in accordance to their respiration-induced tumor motion
Pages 1610 - 1621
Abstract
Tumor location displacement caused by respiration-induced motion reduces the efficacy of radiation therapy. Three medically relevant patterns are often observed in the respiration-induced motion signal: baseline shift, ES-Range shift, and D-Range shift.
In this paper, for patients with lower body cancer, we develop class profiles (a low dimensional pattern frequency structure) that characterize them in terms of these three medically relevant patterns. We propose an adaptive segmentation technique that turns each respiration-induced motion signal into a multi-set of segments based on persistent variations within the signal. These multi-sets of segments is then probed for base behaviors. These base behaviors are then used to develop the group/class profiles using a modified version of the clustering technique described in [1]. Finally, via quantitative analysis, we provide a medical characterization for the class profiles, which can be used to explore breathing intervention technique.
We show that, with i) carefully designed feature sets, ii) the proposed adaptive segmentation technique, iii) the reasonable modifications to an existing clustering algorithm for multi-sets, and iv) the proposed medical characterization methodology, it is possible to reduce the time series respiration-induced motion signals into a compact class profile. One of our co-authors is a medical physician and we used his expert opinion to verify the results.
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VLDB Endowment
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Published: 01 August 2017
Published in PVLDB Volume 10, Issue 12
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