| Zugriffsnummer | 41953 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | CT beam dosimetric characterization procedure for personalized dosimetry |
| Autor(in); Institution |
Rosendahl, Stephan; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
Büermann, Ludwig; 6.2, Dosimetrie für Strahlentherapie und Röntgendiagnostik, PTB-Braunschweig
Borowski, Markus; Städtisches Klinikum Braunschweig gGmbH, Braunschweig, GERMANY
Kortesniemi, Mika; Helsinki University Central Hospital, HUS Medical Imaging Center, Helsinki, FINLAND
Sundell, Veli-Matti; Helsinki University Central Hospital, HUS Medical Imaging Center, Helsinki, FINLAND
Kosunen, Antti; STUK - Radiation and Nuclear Safety Authority, Radiation Metrology Laboratory, Helsinki, FINLAND
Siiskonen, Teemu; STUK - Radiation and Nuclear Safety Authority, Radiation Metrology Laboratory, Helsinki, FINLAND
|
| Quelle/Jahr | Physics in Medicine and Biology: 64 (2019), 7, 17 S. |
| Artikelnummer | 075009 |
| ISSN | 0031-9155 (PRINT) ; 1361-6560 (ONLINE) |
| DOI | |
| Verlag | Bristol: IOP Publishing |
| Freie Schlagworte | Computed tomography ; personalized radiation dosimetry ; Monte Carlo simulation ; equivalent source models |
| Zusammenfassung | Personalized dosimetry in computed tomography (CT) can be realized by a full Monte Carlo (MC) simulation of the scan procedure. Essential input data needed for the simulation are appropriate CT x-ray source models and a model of the patients body which is based on the CT image. The purpose of this work is to develop comprehensive procedures for the determination of CT x-ray source models and their verification by comparison of calculated and measured dose distributions in physical phantoms. Mobile equipment together with customized software was developed and used for non-invasive determination of equivalent source models of CT scanners under clinical conditions. Standard and physical anthropomorphic CT dose phantoms equipped with real-time CT dose probes at five representative positions were scanned. The accumulated dose was measured during the scan at the five positions. ImpactMC, a MC-based CT dose software program, was used to simulate the scan. The necessary inputs were obtained from the scan parameters, from the equivalent source models and from the material-segmented CT images of the phantoms. 3D dose distributions in the phantoms were simulated and the dose values calculated at the five positions inside the phantom were compared to measured dose values. Initial results were obtained by means of a General Electric Optima CT 660 and a Toshiba (Canon) Aquilion ONE. In general, the measured and calculated dose values were within relative uncertainties that had been estimated to be less than 10 %. The procedures developed were found to be viable and rapid. The procedures are applicable to any scanner type under clinical conditions without making use of the service mode with stationary x-ray tube position. Results show that the procedures are well suited for determining and verifying the equivalent source models needed for personalized CT dosimetry based on post-scan MC calculations. |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY 3.0 ; Creative Commons Attribution 3.0 License |
| Themenbereich der Metrologie | Ionisierende Strahlung |
| Forschungsprojekt | 15HLT05: PerfusImaging: Metrology for multi-modality imaging of impaired tissue perfusion |
| Förderinformationen (1) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMPIR 2015 Health Titel der Förderung: 15HLT05: PerfusImaging: Metrology for multi-modality imaging of impaired tissue perfusion Förderungsnummer: 15HLT05 |
Zitierung
Rosendahl, S., Büermann, L., Borowski, M., Kortesniemi, M., Sundell, V.-M., Kosunen, A., & Siiskonen, T. (2019). CT beam dosimetric characterization procedure for personalized dosimetry. Physics in Medicine and Biology, 64(7), 17 S. https://doi.org/10.1088/1361-6560/ab0e97