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Verfasst von:Arns, Anna Maria [VerfasserIn]   i
 Blessing, Manuel [VerfasserIn]   i
 Fleckenstein, Jens [VerfasserIn]   i
 Stsepankou, Dzmitry [VerfasserIn]   i
 Boda-Heggemann, Judit [VerfasserIn]   i
 Hesser, Jürgen [VerfasserIn]   i
 Wenz, Frederik [VerfasserIn]   i
 Wertz, Hansjörg [VerfasserIn]   i
Titel:Phantom-based evaluation of dose exposure of ultrafast combined kV-MV-CBCT towards clinical implementation for IGRT of lung cancer
Verf.angabe:Anna Arns, Manuel Blessing, Jens Fleckenstein, Dzmitry Stsepankou, Judit Boda-Heggemann, Juergen Hesser, Frank Lohr, Frederik Wenz, Hansjoerg Wertz
Fussnoten:Gesehen am 12.06.2018
Titel Quelle:Enthalten in: PLOS ONE
Jahr Quelle:2017
Band/Heft Quelle:12(2017,11) Artikel-Nummer e0187710, 15 Seiten
ISSN Quelle:1932-6203
Abstract:Purpose Combined ultrafast 90°+90° kV-MV-CBCT within single breath-hold of 15s has high clinical potential for accelerating imaging for lung cancer patients treated with deep inspiration breath-hold (DIBH). For clinical feasibility of kV-MV-CBCT, dose exposure has to be small compared to prescribed dose. In this study, kV-MV dose output is evaluated and compared to clinically-established kV-CBCT. Methods Accurate dose calibration was performed for kV and MV energy; beam quality was determined. For direct comparison of MV and kV dose output, relative biological effectiveness (RBE) was considered. CT dose index (CTDI) was determined and measurements in various representative locations of an inhomogeneous thorax phantom were performed to simulate the patient situation. Results A measured dose of 20.5mGE (Gray-equivalent) in the target region was comparable to kV-CBCT (31.2mGy for widely-used, and 9.1mGy for latest available preset), whereas kV-MV spared healthy tissue and reduced dose to 6.6mGE (30%) due to asymmetric dose distribution. The measured weighted CTDI of 12mGE for kV-MV lay in between both clinical presets. Conclusions Dosimetric properties were in agreement with established imaging techniques, whereas exposure to healthy tissue was reduced. By reducing the imaging time to a single breath-hold of 15s, ultrafast combined kV-MV CBCT shortens patient time at the treatment couch and thus improves patient comfort. It is therefore usable for imaging of hypofractionated lung DIBH patients.
DOI:doi:10.1371/journal.pone.0187710
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.

Kostenfrei: Verlag: http://dx.doi.org/10.1371/journal.pone.0187710
 Kostenfrei: Verlag: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0187710
 DOI: https://doi.org/10.1371/journal.pone.0187710
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1576295613
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