%0 Journal Article
%T Dosimetric comparison between coplanar and non coplanar field radiotherapy for ethmoid sinus cancer
%A Antoine Serre
%A Katia Idri
%A Pascal Fenoglietto
%A Norbert Ailleres
%A Lore Santoro
%A Claire Lemanski
%A Renaud Garrel
%A Marc Makeieff
%A Ali Allaw
%A Jean-Bernard Dubois
%A David Azria
%J Radiation Oncology
%D 2007
%I BioMed Central
%R 10.1186/1748-717x-2-35
%X Seven patients treated with NCF IMRT for ethmoid cancer were studied. A CF IMRT optimization was prepared with the same constraints as for the NCF treatment. The maximum point doses (D max) obtained for the different optic pathway structures (OPS) should differ no more than 3% from those achieved with the NCF IMRT plan. The distribution of the dose in the target volume and in the critical structures was compared between the two techniques, as well as the Conformity (CI) and the Homogeneity Indexes (HI) in the target volume.We noted no difference between the two techniques in the OPS for the D1, D2, and D5%, in the inner ear and controlateral lens for the average Dmax, in the temporo-mandibular joints for the average mean dose, in the cord and brainstem for the average D1%. The dose-volume histograms were slightly better with the NCF treatment plan for the planning target volume (PTV) with a marginally better HI but no impact on CI. We found a great improvement in the PTV coverage with the CF treatment plan for two patients with T4 tumors.IMRT is one of the treatment options for ethmoid cancer. The PTV coverage is optimal without compromising the protection of the OPS. The impact of non coplanar versus coplanar set up is very slight.Ethmoid sinus cancers are rare malignant tumors of the paranasal sinuses. They are often diagnosed at a late stage and are often, at that point, locally advanced. Despite the lack of randomised studies [1-3] we have a multidisciplinary approach with initial surgery and adjuvant radiotherapy. Planning the radiation treatment is a challenge for the radiophysician due to the proximity of critical and radiosensitive structures. The outcome is suboptimal with locoregional failure and treatment morbidity [4-9]. The implementation of intensity modulated radiotherapy (IMRT) for this pathology offers a better bilateral sparing of the optic pathways and probably increases the therapeutic ratio. Nevertheless, the coverage of the target volume depend
%U http://www.ro-journal.com/content/2/1/35