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Verfasst von:Sauppe, Sebastian [VerfasserIn]   i
 Kuhm, Julian [VerfasserIn]   i
 Brehm, Marcus [VerfasserIn]   i
 Paysan, Pascal [VerfasserIn]   i
 Seghers, Dieter [VerfasserIn]   i
 Kachelrieß, Marc [VerfasserIn]   i
Titel:Motion vector field phase-to-amplitude resampling for 4D motion-compensated cone-beam CT
Verf.angabe:Sebastian Sauppe, Julian Kuhm, Marcus Brehm, Pascal Paysan, Dieter Seghers and Marc Kachelrieß
E-Jahr:2018
Jahr:2 February 2018
Umfang:14 S.
Fussnoten:Gesehen am 23.05.2019
Titel Quelle:Enthalten in: Physics in medicine and biology
Ort Quelle:Bristol : IOP Publ., 1956
Jahr Quelle:2018
Band/Heft Quelle:63(2018), 3, Artikel-ID 035032, Seite 1-14
ISSN Quelle:1361-6560
Abstract:We propose a phase-to-amplitude resampling (PTAR) method to reduce motion blurring in motion-compensated (MoCo) 4D cone-beam CT (CBCT) image reconstruction, without increasing the computational complexity of the motion vector field (MVF) estimation approach. PTAR is able to improve the image quality in reconstructed 4D volumes, including both regular and irregular respiration patterns. The PTAR approach starts with a robust phase-gating procedure for the initial MVF estimation and then switches to a phase-adapted amplitude gating method. The switch implies an MVF-resampling, which makes them amplitude-specific. PTAR ensures that the MVFs, which have been estimated on phase-gated reconstructions, are still valid for all amplitude-gated reconstructions. To validate the method, we use an artificially deformed clinical CT scan with a realistic breathing pattern and several patient data sets acquired with a TrueBeamTM integrated imaging system (Varian Medical Systems, Palo Alto, CA, USA). Motion blurring, which still occurs around the area of the diaphragm or at small vessels above the diaphragm in artifact-specific cyclic motion compensation (acMoCo) images based on phase-gating, is significantly reduced by PTAR. Also, small lung structures appear sharper in the images. This is demonstrated both for simulated and real patient data. A quantification of the sharpness of the diaphragm confirms these findings. PTAR improves the image quality of 4D MoCo reconstructions compared to conventional phase-gated MoCo images, in particular for irregular breathing patterns. Thus, PTAR increases the robustness of MoCo reconstructions for CBCT. Because PTAR does not require any additional steps for the MVF estimation, it is computationally efficient. Our method is not restricted to CBCT but could rather be applied to other image modalities.
DOI:doi:10.1088/1361-6560/aaa16d
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1088/1361-6560/aaa16d
 Volltext: https://doi.org/10.1088%2F1361-6560%2Faaa16d
 DOI: https://doi.org/10.1088/1361-6560/aaa16d
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1666192392
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