Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/52902

TitleVoxel-based registration of simulated and real patient CBCT data for accurate dental implant pose estimation
Author(s)Moreira, António Herculano Jesus
Queirós, Sandro Filipe Monteiro
Morais, Pedro André Gonçalves
Rodrigues, Nuno F.
Correia, André Ricardo
Fernandes, Valter
Pinho, A. C. Marques
Fonseca, Jaime C.
Vilaça, João L.
KeywordsDental prosthetics
Cone-beam CT simulation
Voxel-based rigid registration
Computer-aided modelling
Issue dateFeb-2015
PublisherSPIE
JournalProceedings of SPIE
Abstract(s)The success of dental implant-supported prosthesis is directly linked to the accuracy obtained during implant's pose estimation (position and orientation). Although traditional impression techniques and recent digital acquisition methods are acceptably accurate, a simultaneously fast, accurate and operator-independent methodology is still lacking. Hereto, an image-based framework is proposed to estimate the patient-specific implant's pose using cone-beam computed tomography (CBCT) and prior knowledge of implanted model. The pose estimation is accomplished in a threestep approach: (1) a region-of-interest is extracted from the CBCT data using 2 operator-defined points at the implant's main axis; (2) a simulated CBCT volume of the known implanted model is generated through Feldkamp-Davis-Kress reconstruction and coarsely aligned to the defined axis; and (3) a voxel-based rigid registration is performed to optimally align both patient and simulated CBCT data, extracting the implant's pose from the optimal transformation. Three experiments were performed to evaluate the framework: (1) an in silico study using 48 implants distributed through 12 tridimensional synthetic mandibular models; (2) an in vitro study using an artificial mandible with 2 dental implants acquired with an i-CAT system; and (3) two clinical case studies. The results shown positional errors of 67±34μm and 108μm, and angular misfits of 0.15±0.08 and 1.4, for experiment 1 and 2, respectively. Moreover, in experiment 3, visual assessment of clinical data results shown a coherent alignment of the reference implant. Overall, a novel image-based framework for implants' pose estimation from CBCT data was proposed, showing accurate results in agreement with dental prosthesis modelling requirements.
TypeconferencePaper
Description"Progress in Biomedical Optics and Imaging, vol. 16, nr. 42"
URIhttp://hdl.handle.net/1822/52902
ISBN978-162841504-9
DOI10.1117/12.2082806
ISSN0277-786X
e-ISSN1996-756X
Peer-Reviewedyes
AccessopenAccess
Appears in Collections:CT2M - Publicações em atas de encontros científicos / Papers in conference proceedings
DEI - Artigos em atas de congressos internacionais

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