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Oncol."],"abstract":"Objective<\/jats:title>Our study aims to estimate intra-fraction six-dimensional (6D) tumor motion with rotational correction and the related correlations between motions of different degrees of freedom (DoF), as well as quantify sufficient anisotropic clinical target volume (CTV) to planning target volume (PTV) margins during stereotactic body radiotherapy (SBRT) of liver cancer with fiducial tracking technique.<\/jats:p><\/jats:sec>Methods<\/jats:title>A cohort of 12 patients who were implanted with 3 or 4 golden markers were included in this study, and 495 orthogonal kilovoltage (kV) pairs of images acquired during the first fraction were used to extract the spacial position of each golden marker. Translational and rotational motions of tumor were calculated based on the marker coordinates by using an iterative closest point (ICP) algorithm. Moreover, the Pearson product-moment correlation coefficients (r<\/jats:italic>) were applied to quantify the correlations between motions with different degrees of freedom (DoFs). The population mean displacement (M<\/mml:mi>P<\/mml:mi><\/mml:msub><\/mml:mrow>\u00af<\/mml:mo><\/mml:mover><\/mml:mrow><\/mml:math><\/jats:inline-formula>), systematic error (\u03a3) and random error (\u03c3<\/jats:italic>) were obtained to calculate PTV margins based on published recipes.<\/jats:p><\/jats:sec>Results<\/jats:title>The mean translational variability of tumors were 0.56, 1.24 and 3.38\u00a0mm in the left-right (LR, X<\/jats:italic>), anterior-posterior (AP, Y<\/jats:italic>), and superior-inferior (SI, Z<\/jats:italic>) directions, respectively. The average rotational angles \u03b8<\/jats:italic>X<\/jats:italic><\/jats:sub> , \u03b8<\/jats:italic>Y<\/jats:italic><\/jats:sub> and \u03b8<\/jats:italic>Z<\/jats:italic><\/jats:sub> around the three coordinate axes were 0.88, 1.24 and 1.12, respectively. (|r<\/jats:italic>|&gt;0.4) was obtainted between Y<\/jats:italic> -Z<\/jats:italic> , Y<\/jats:italic> - \u03b8<\/jats:italic>Z<\/jats:italic><\/jats:sub> , Z<\/jats:italic> -\u03b8<\/jats:italic>Z<\/jats:italic><\/jats:sub> and \u03b8<\/jats:italic>X<\/jats:italic><\/jats:sub> - \u03b8<\/jats:italic>Y<\/jats:italic><\/jats:sub> . The PTV margins calculated based on 13 published recipes in X, Y, and Z directions were 1.08, 2.26 and 5.42\u00a0mm, and the 95% confidence interval (CI) of them were (0.88,1.28), (1.99,2.53) and (4.78,6.05), respectively.<\/jats:p><\/jats:sec>Conclusions<\/jats:title>The maximum translational motion was in SI direction, and the largest correlation coefficient of Y<\/jats:italic>-Z<\/jats:italic> was obtained. We recommend margins of 2, 3 and 7\u00a0mm in LR, AP and SI directions, respectively.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fonc.2022.1021119","type":"journal-article","created":{"date-parts":[[2022,11,16]],"date-time":"2022-11-16T06:15:42Z","timestamp":1668579342000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":8,"title":["Quantifying 6D tumor motion and calculating PTV margins during liver stereotactic radiotherapy with fiducial 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