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Exclusive MRI-based tandem and colpostats reconstruction in gynaecological brachytherapy treatment planning

AutorPérez-Calatayud, J.; Kuipers, F.; Ballester, Facundo ; Granero, Domingo ; Richart, J.; Rodríguez, Silvia; Tormo, Alejandro; Santos, Manuel
Fecha de publicación22-oct-2008
CitaciónRadiotherapy and Oncology 91 (2009) 181–186
ResumenPurpose: According to the GYN GEC-ESTRO Recommendations, MRI is needed with the modality of T2 weighted. CT-MR compatible tandem Plus colpostats (T/C) (Nucletron) is widely used in cervical brachytherapy. The major challenge of MRI is the lack of dummy catheters. Therefore, an additional imaging modality is usually required. One disadvantage of sliced-based reconstruction is that resolution in longitudinal directions can be affected by the slice thickness. The aim of this study is to present a modified T/C applicator in which the catheter visibility is significantly improved. Methods and materials: A modification to the existing T/C applicator has been made available, increasing the catheter entrance diameter. It allows a greater dummy catheter diameter, and consequently it can be filled with more material per unit length. Visibility was studied with different materials. Results: The catheter filled with saline water plus iodine Compound was clearly seen in both axial and longitudinal acquisitions, To avoid uncertainties introduced by the slice thickness, a simple procedure is presented using longitudinal acquisitions. Conclusions: The modified applicator plus catheter allows a powerful signal in T2 weighted MRI, using a very simple and accessible material. Also, a method is proposed to solve the problem of the uncertainty derived from slice thickness using few longitudinal acquisitions
Versión del editorhttp://dx.doi.org/10.1016/j.radonc.2008.09.004
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