Online-Ressource | |
Verfasst von: | Reinhart, Anna Merle [VerfasserIn] |
Renkamp, Claudia Katharina [VerfasserIn] | |
Martišíková, Mária [VerfasserIn] | |
Titel: | Three dimensional reconstruction of therapeutic carbon ion beams in phantoms using single secondary ion tracks |
Verf.angabe: | Anna Merle Reinhart, Claudia Katharina Spindeldreier, Jan Jakubek and Mária Martišíková |
E-Jahr: | 2017 |
Jahr: | 22 May 2017 |
Fussnoten: | Gesehen am 09.05.2018 |
Titel Quelle: | Enthalten in: Physics in medicine and biology |
Ort Quelle: | Bristol : IOP Publ., 1956 |
Jahr Quelle: | 2017 |
Band/Heft Quelle: | 62(2017,12) Artikel-Nummer 4884, 14 Seiten |
ISSN Quelle: | 1361-6560 |
Abstract: | Carbon ion beam radiotherapy enables a very localised dose deposition. However, even small changes in the patient geometry or positioning errors can significantly distort the dose distribution. A live, non-invasive monitoring system of the beam delivery within the patient is therefore highly desirable, and could improve patient treatment. We present a novel three-dimensional method for imaging the beam in the irradiated object, exploiting the measured tracks of single secondary ions emerging under irradiation. The secondary particle tracks are detected with a TimePix stack—a set of parallel pixelated semiconductor detectors. We developed a three-dimensional reconstruction algorithm based on maximum likelihood expectation maximization. We demonstrate the applicability of the new method in the irradiation of a cylindrical PMMA phantom of human head size with a carbon ion pencil beam of ##IMG## [http://ej.iop.org/images/0031-9155/62/12/4884/pmbaa6aebieqn001.gif] $226$ MeV u −1 . The beam image in the phantom is reconstructed from a set of nine discrete detector positions between ##IMG## [http://ej.iop.org/images/0031-9155/62/12/4884/pmbaa6aebieqn002.gif] $-80^\circ$ and ##IMG## [http://ej.iop.org/images/0031-9155/62/12/4884/pmbaa6aebieqn003.gif] $50^\circ$ from the beam axis. Furthermore, we demonstrate the potential to visualize inhomogeneities by irradiating a PMMA phantom with an air gap as well as bone and adipose tissue surrogate inserts. We successfully reconstructed a three-dimensional image of the treatment beam in the phantom from single secondary ion tracks. The beam image corresponds well to the beam direction and energy. In addition, cylindrical inhomogeneities with a diameter of ##IMG## [http://ej.iop.org/images/0031-9155/62/12/4884/pmbaa6aebieqn004.gif] $2.85$ cm and density differences down to ##IMG## [http://ej.iop.org/images/0031-9155/62/12/4884/pmbaa6aebieqn005.gif] $0.3$ g cm −3 to the surrounding material are clearly visualized. This novel three-dimensional method to image a therapeutic carbon ion beam in the irradiated object does not interfere with the treatment and requires knowledge only of single secondary ion tracks. Even with detectors with only a small angular coverage, the three-dimensional reconstruction of the fragmentation points presented in this work was found to be feasible. |
DOI: | doi:10.1088/1361-6560/aa6aeb |
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 ; Verlag: http://dx.doi.org/10.1088/1361-6560/aa6aeb |
Volltext: http://stacks.iop.org/0031-9155/62/i=12/a=4884 | |
DOI: https://doi.org/10.1088/1361-6560/aa6aeb | |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1574300156 |
Verknüpfungen: | → Zeitschrift |