University of Twente Student Theses
Towards an objective automated pre-operative 3D planning technique for open cranial vault reconstruction in craniosynostosis patients
Tolhuisen, M.L. (2016) Towards an objective automated pre-operative 3D planning technique for open cranial vault reconstruction in craniosynostosis patients.
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| Abstract: | [Background] 3D virtual planning of open cranial vault reconstruction is used to simulate and define an operative plan for craniosynostosis surgery pre-operatively. However, virtual planning techniques are subjective and dependent on the experience and preferences of the surgical team. In order to enable further development of a truly objective automated 3D pre-operative planning technique for open cranial vault reconstructions, curvature maps were used for the local shape comparison of the patient’s skull with an age-specific normative skull model. [Methods] Mesh data of skulls were created using marching cubes. All skulls were oriented similarly within the used coordinate system and ray casting was used to obtain sampled 3D metrical data of the inner and outer layer of the skulls. Normalised skulls were created for the age groups of 0-1, 2-4, 5-7, 8-10, 11-14, 15-18, 19-24, 25-36, 37-48 months. Also, a test object was created and a cranial CT-scan of a 11 months old trigonocephaly patient was selected. Gaussian curvature was estimated with quadric surface fitting and curvature maps were computed. The shape comparison was tested for the test object and within the normalised skull of the 11-14 age group. Finally, shape comparison was performed for the trigonocephalic skull with the ageappropriate normalised skull. [Results] Normalised skulls and thickness maps were created for the defined age groups. Similar shapes were correctly identified and the identification of the region on the patient’s skull, that maximally corresponded in shape with the reference shape, was feasible. [Conclusion] It is shown that curvature maps allow the shape comparison of craniosynostosis skulls with age-appropriate normative skulls. This study showed the first step towards an objective userindependent pre-operative planning technique for open cranial vault reconstructions. |
| Item Type: | Essay (Master) |
| Clients: | Unknown organization, Nederland |
| Faculty: | TNW: Science and Technology |
| Subject: | 44 medicine |
| Programme: | Technical Medicine MSc (60033) |
| Link to this item: | https://purl.utwente.nl/essays/71337 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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