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• W4377115823 abstract "PurposesWith the recent clinical implementation of MR-guided linear accelerators, a large amount of real-time planar MR images have been acquired during lung cancer treatment as a standard of care. In this study, associations among lung tumor, diaphragm, and external skin movement were studied based on MR cine imaging during the entire duration of each treatment fraction.Methods and MaterialsThis retrospective study used 181,798 planar MR image frames acquired over 55 treatment/imaging sessions of 13 lung cancer patients treated on two MRI-guided linear accelerators. From each planar MR image frame, in-house software automatically extracted nine features: the superior-interior (SI) and posterior-anterior (PA) positions of a lung tumor; the area of the lung (Lung_Area); the posterior (Dia_Post), dome/apex (Dia_Dome), and anterior (Dia_Ant) points of a diaphragmatic curve; the diaphragm curve point (Dia_Max), the chest (Chest) and belly (Belly) skin points. Correlation analyses were performed among the 9 features for every session. Lung tumor motion range and standard deviations were calculated based on positions obtained in Cine images and compared with motion ranges obtained from 4D CT images.Results177,009 frames of images were successfully analyzed. For all patients, correlation coefficients were as follows: 0.91 ± 0.10 between any two features among Lung_Area, Dia_Post, Dia_Dome, and Dia_Max; 0.82 ± 0.21 between SI and any feature among Lung_Area, Dia_Post, Dia_Dome, and Dia_Max; 0.75 ± 0.24 between SI and Belly. Six of 13 patients were considered large amplitude motion (patients with lung tumor SI motion standard deviation greater than 5 mm). 92,956 frames of images were analyzed for the 6 large-amplitude motion patients. For this set, correlation coefficients were 0.93 ± 0.07 between any two features among Lung_Area, Dia_Post, Dia_Dome, and Dia_Max; 0.94 ± 0.06 between SI and any feature among Lung_Area, Dia_Post, Dia_Dome, and Dia_Max; and 0.90 ± 0.09 between SI and Belly.ConclusionBoth belly and diaphragmatic motions as assessed by cine MR imaging are highly correlated with large amplitude lung tumor motion in the longitudinal axis." @default.
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• W4377115823 date "2023-05-01" @default.
• W4377115823 modified "2023-09-25" @default.
• W4377115823 title "Association of Internal and External Motion Based on Cine MR Images Acquired During Real-Time Treatment on MRI–Guided Linear Accelerator for Patients With Lung Cancer" @default.
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• W4377115823 doi "https://doi.org/10.1016/j.adro.2023.101271" @default.
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