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Titolo:
In-vitro assessment of a registration protocol for image guided implant dentistry
Autore:
Birkfellner, W; Solar, P; Gahleitner, A; Huber, K; Kainberger, F; Kettenbach, J; Homolka, P; Diemling, M; Watzek, G; Bergmann, H;
Indirizzi:
Univ Vienna, Gen Hosp, Dept Biomed Engn & Phys, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 ed Engn & Phys, A-1090 Vienna, Austria Univ Vienna, Sch Dent, Dept Oral Surg, A-1090 Vienna, Austria Univ ViennaVienna Austria A-1090 Dept Oral Surg, A-1090 Vienna, Austria Univ Vienna, Gen Hosp, Dept Osteoradiol, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 pt Osteoradiol, A-1090 Vienna, Austria Univ Vienna, Gen Hosp, Dept Angiog & Intervent Radiol, A-1090 Vienna, Austria Univ Vienna Vienna Austria A-1090 tervent Radiol, A-1090 Vienna, Austria Ludwig Boltzmann Inst Nucl Med, Vienna, Austria Ludwig Boltzmann Inst NuclMed Vienna Austria Nucl Med, Vienna, Austria
Titolo Testata:
CLINICAL ORAL IMPLANTS RESEARCH
fascicolo: 1, volume: 12, anno: 2001,
pagine: 69 - 78
SICI:
0905-7161(200102)12:1<69:IAOARP>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
CT IMAGES; STEREOTAXIC NEUROSURGERY; FRAMELESS STEREOTAXY; DENTAL IMPLANTS; PHYSICAL SPACE; SURGERY; HEAD; TRACKING; SYSTEM; MR;
Keywords:
image guided therapy; computer aided surgery; implant dentistry; registration; accuracy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Birkfellner, W Univ Vienna, Gen Hosp, Dept Biomed Engn & Phys, 4L,Waehringer Guertel 18-20, A-1090 Vienna, Austria Univ Vienna 4L,Waehringer Guertel 18-20 Vienna Austria A-1090
Citazione:
W. Birkfellner et al., "In-vitro assessment of a registration protocol for image guided implant dentistry", CLIN OR IMP, 12(1), 2001, pp. 69-78

Abstract

In this study a computer aided navigation In this study a computer aided navigation technique for accurate positioning of oral implants was assessed. An optical tracking system with specially designed tools for monitoring the position of surgical instruments relative to the patient was used to register 5 partially or completely edentulous jaw models. Besides the accuracy of the tracking system, the precision of localizing a specific position on 3-dimensional preoperative imagery is governed by the registration algorithm which conveys the coordinate system of the preoperative computed tomography (CT) scan to the actual patient position. Two different point-to-point registration algorithms were compared their suitability for this application. The accuracy was determined separately for the localization error of the position measurement hardware (fiducial localization error FLE) and the error as reported by the registration algorithm (fiducial registration error FRE). The overall error of the navigation procedure was determined as the localization error of additional landmarks (steel spheres, 0.5 mm diameter) after registration (target registration error - TRE). Images of the jaw models were obtained using a high resolution CT scan (1.5 mm slice thickness, 1mm table feed, incremental scanning, 120 kV, 150 mAs, 512 . 512 matrix, FOV 120 mm). The accuracy of the position measurement probes was 0.69+/-0.15 mm (FLE). Using 3 implanted fiducial markers, FRE was 0.71+/-0.12 mm on average ano 1.00+/-0.13 mm maximum. TRE was found to be 1.23+/-0.28 mm averageand 1.87+/-0.47 mm maximum. increasing the number of fiducial markers to atotal of 5 did not significantly improve precision. Furthermore it was found that a registration algorithm based on solving an eigenvalue problem is the superior approach for point-to-point matching in terms of mathematical stability. The was 0.71+/-0.12 mm on average and 1.00+/-0.13 mm maximum. TRE was found to be experimental results indicate that positioning accuracy of oral implants may benefit computer aided intraoperative navigation. The accuracy achieved compares well to the resolution of the CT scan used. Further development of point-to-point/point-to-surFace registration methods and tracking hardware has the potential to improve the precision of the method even further. Our system has potential to reduce the intraoperative risk ofcausing damage to critical anatomic structures, to minimize the efforts inprosthetic modelling, and to simplify the task of transferring preoperative planning data precisely to the operating room in general.

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Documento generato il 09/04/20 alle ore 19:40:34