Reference : A treatment planning intercomparison of proton and intensity modulated photon radiothera...
Scientific journals : Article
Human health sciences : Hematology
Human health sciences : Oncology
http://hdl.handle.net/2268/5917
A treatment planning intercomparison of proton and intensity modulated photon radiotherapy.
English
Lomax, T [ > > ]
Goitein, G [ > > ]
Debus, J [ > > ]
Dykstra, C [ > > ]
Tercier, P-A [ > > ]
COUCKE, Philippe mailto [oncology, University Hospital of Lausanne, CHUV, Lausanne, > > Radiothérapie > > >]
Mirimanoff, R-O [ > > ]
1999
Radiotherapy & Oncology
Elsevier Scientific
51(3)
257-272
Yes (verified by ORBi)
International
0167-8140
Limerick
Ireland
[en] radiotherapy ; phototherapy
[en] Abstract
Purpose: A comparative treatment planning study has been undertaken between standard photon delivery techniques,b intensity modulated photon methods and spot scanned protons in order to investigate the merits and limitations of each of these treatment approaches.

Methods: Plans for each modality were performed using CT scans and planning information for nine patients with varying indications and lesion sites and the results have been analysed using a variety of dose and volume based parameters.

Results: Over all cases, it is predicted that the use of protons could lead to a reduction of the total integral dose by a factor three compared to standard photon techniques and a factor two compared to IM photon plans. In addition, in all but one Organ at Risk (OAR) for one case, protons are predicted to reduce both mean OAR dose and the irradiated volume at the 50% mean target dose level compared to both photon methods. However, when considering the volume of an OAR irradiated to 70% or more of the target dose, little difference could be shown between proton and intensity modulated photon plans. On comparing the magnitude of dose hot spots in OARs resulting from the proton and IM photon plans, more variation was observed, and the ranking of the plans was then found to be case and OAR dependent.

Conclusions: The use of protons has been found to reduce the medium to low dose load (below about 70% of the target dose) to OARs and all non-target tissues compared to both standard and inversely planned photons, but that the use of intensity modulated photons can result in similar levels of high dose conformation to that afforded by protons. However, the introduction of inverse planning methods for protons is necessary before general conclusions on the relative efficacy of photons and protons can be drawn.
Researchers ; Professionals
http://hdl.handle.net/2268/5917

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