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S25-5 Radiological and surgical planning with a new computer tomography software 1 1 2 Borro D. , Amundarain A. , Manrique M. , Manrique R. 2 1 CEIT and TECNUN. University of Navarra, San Sebastian, Spain, 2University of Navarra Clinic, ENT, Pamplona, Spain Introduction: Viewit-Chochlea is newly developed research software which enables surgeons to easily and accurately assess the proper placement options of bone-conduction devices, such as the Bonebridge, on the temporal bone of the patient. The implantation of bone-conduction devices, and in particular the Bonebridge BCFMT, requires a recess to be drilled into the cranial bone. This software allows the surgeon to analyze the dimensions of the bone and to verify whether an optimal placement of the device is possible without compressing critical structures like the dura or sigmoid sinus. Material and methods: The placement process starts with importing a Computer Tomography scan stored in the common DICOM format and the digital template of the bone-conduction device. The bone-conduction template of the BC-FMT can be placed on one of the views, the coronal, the axial or the sagittal view by just one click on the mastoid. It can now be easily rotated in the three dimensions with the mouse. Each of the views can be scrolled through verifying if critical structures are preserved. The implant is fixed on the skull with two cortical screws which placement can also be identified. The last step of the procedure is the surgical planning which consists of the three dimensional reconstruction of the skull showing the proper placement of the device. The reference points like the temporal line, the mastoid tip as well as the spine of Henle guide the surgeon to find the same position on the head of the patient. Conclusions: The software is an easy to handle tool to carry out an accurate radiological and surgical planning in a very short time frame. [Radiological 1] [Radiological 2] 481
