Improved delineation of CT virtual bronchoscopy by ultrahigh-resolution CT: comparison among different reconstruction pa
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ORIGINAL ARTICLE
Improved delineation of CT virtual bronchoscopy by ultrahigh‑resolution CT: comparison among different reconstruction parameters Takuya Adachi1 · Haruhiko Machida2 · Makiko Nishikawa2 · Takahiro Arai1 · Toshiya Kariyasu2 · Masamichi Koyanagi1 · Kenichi Yokoyama2 Received: 27 December 2019 / Accepted: 3 April 2020 © The Author(s) 2020
Abstract Purpose We compared the maximal recognizable bronchial bifurcation order (MRBBO) in CT virtual bronchoscopy (CTVB) using ultrahigh-resolution CT (UHRCT) and different reconstruction parameters. Materials and methods We enrolled 38 patients undergoing noncontrast chest CT by UHRCT and reconstructed CTVB utilizing 3 different combinations of reconstruction parameters, as classified into Group A (matrix size, 512; slice thickness, 1.0 mm), Group B (matrix size, 512; slice thickness, 0.5 mm), and Group C (matrix size, 1024; slice thickness, 0.25 mm). In right S1, left S1 + 2, and both S3 and S10, two reviewers counted the number of consecutively identified bronchial bifurcations to compare MRBBO among these groups using Kruskal–Wallis test. Results In these segments, MRBBO increased from Group A to C. MRBBO was significantly higher in Group C than in both Groups A and B in all the segments except left S10 (P
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