%0 Journal Article
%A Qubala, Abdallah
%A Shafee, Jehad
%A Batista, Vania
%A Liermann, Jakob
%A Winter, Marcus
%A Piro, Daniel
%A Jäkel, Oliver
%T Comparative evaluation of a surface-based respiratory monitoring system against a pressure sensor for 4DCT image reconstruction in phantoms.
%J Journal of applied clinical medical physics
%V 25
%N 2
%@ 1526-9914
%C Reston, Va.
%I ACMP
%M DKFZ-2023-02040
%P e14174
%D 2024
%Z #LA:E040# / 2024 Feb;25(2):e14174
%X Four-dimensional computed tomography (4DCT), which relies on breathing-induced motion, requires realistic surrogate information of breathing variations to reconstruct the tumor trajectory and motion variability of normal tissues accurately. Therefore, the SimRT surface-guided respiratory monitoring system has been installed on a Siemens CT scanner. This work evaluated the temporal and spatial accuracy of SimRT versus our commonly used pressure sensor, AZ-733 V. A dynamic thorax phantom was used to reproduce regular and irregular breathing patterns acquired by SimRT and Anzai. Various parameters of the recorded breathing patterns, including mean absolute deviations (MAD), Pearson correlations (PC), and tagging precision, were investigated and compared to ground-truth. Furthermore, 4DCT reconstructions were analyzed to assess the volume discrepancy, shape deformation and tumor trajectory. Compared to the ground-truth, SimRT more precisely reproduced the breathing patterns with a MAD range of 0.37 ± 0.27 and 0.92 ± 1.02 mm versus Anzai with 1.75 ± 1.54 and 5.85 ± 3.61 mm for regular and irregular breathing patterns, respectively. Additionally, SimRT provided a more robust PC of 0.994 ± 0.009 and 0.936 ± 0.062 for all investigated breathing patterns. Further, the peak and valley recognition were found to be more accurate and stable using SimRT. The comparison of tumor trajectories revealed discrepancies up to 7.2 and 2.3 mm for Anzai and SimRT, respectively. Moreover, volume discrepancies up to 1.71 ± 1.62
%K 4DCT reconstruction (Other)
%K Surface-guided radiotherapy (Other)
%K breathing detection (Other)
%K breathing surrogate (Other)
%K commissioning (Other)
%K mobile tumors (Other)
%K motion artifacts (Other)
%K respiratory monitoring system (Other)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:37815197
%R 10.1002/acm2.14174
%U https://inrepo02.dkfz.de/record/284633