Investigation of the dosimetric impact of a Ni-Ti fiducial marker in carbon ion and proton beams...nickel-titanium
Introduction. Fiducial markers based on a removable stent are currently used in image guided radiotherapy. Here it is investigated what the possible dosimetric impact of such a marker could be, if used in proton or carbon ion treatment. Material and methods. The simulations have been done using the...
| Published in: | Acta Oncologica Vol. 49; no. 7; pp. 1160 - 1165 |
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| Main Authors: | , , , , |
| Format: | pictorial research tables/charts Journal Article |
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Medical Journals Sweden AB
Oct2010
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105098266&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105098266 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 0284186X B84 jtl: Acta Oncologica issn: 0284186X maglogo: N pubinfo: dt: Oct2010 vid: 49 iid: 7 pid: 59195 pub: Medical Journals Sweden AB artinfo: ui: 105098266 53508548 10.3109/0284186X.2010.505934 105098266 ppf: 1160 ppct: 5 formats: tig: atl: Investigation of the dosimetric impact of a Ni-Ti fiducial marker in carbon ion and proton beams...nickel-titanium aug: au: Herrmann R Carl J Jäkel O Bassler N Petersen JBB affil: Department of Experimental Clinical Oncology, Aarhus University Hospital, Denmark sug: subj: Prostheses and Implants Radiation Dosage Nickel Titanium Stents Utilization Dosimetry Ions Therapeutic Use Protons Therapeutic Use Carbon Therapeutic Use Prostatic Neoplasms Radiotherapy Human Funding Source ab: Introduction. Fiducial markers based on a removable stent are currently used in image guided radiotherapy. Here it is investigated what the possible dosimetric impact of such a marker could be, if used in proton or carbon ion treatment. Material and methods. The simulations have been done using the Monte Carlo particle transport code FLUKA with its default hadron therapy settings. A 3 cm long stent is approximated in FLUKA by stacking hollow tori. To simulate realistic clinical conditions a field 5 × 5 cm has been used, delivering a 5 cm wide spread out Bragg peak located 5 cm deep for protons and carbon ions. For protons fields mimicking active and passive beam delivery have been investigated. The stent has been arranged perpendicular, turned 45 degrees, and parallel to the beam axis. Results. The position of the 95% dose level shifts for carbon ions 7 mm in proximal direction for the marker perpendicular to the beam and 8 mm if the stent is turned 45 degree for a 1 × 1 cm dose binning on the centre beam axis. For the case where the stent was parallel to beam direction the 95% dose level shifts 26 mm. For active delivered protons, the shift of the 95% dose level is less. The shift for a perpendicular arranged marker is 6 mm, for 45 degrees turned it is 7 mm. For the case where the stent was oriented parallel to the beam, the observed shift is 21 mm. Dose inhomogeneities caused by straggling effects occur only near the distal edge of the field. Conclusions. The results of our investigations show that the Ni-Ti marker has a non negligible impact on the dose distributions for the used radiation types. However if the treatment plan rules out narrow angles between symmetry axis of the stent and the beam direction, this may be compensated. pubtype: Academic Journal doctype: pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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