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Accuracy of drilling guides for transfer from three-dimensional CT-based planning to placement of zygoma implants in human cadavers (2003)

Van Steenberghe, Daniel ; Malevez, Chantal ; Van Cleynenbreugel, Johan ; [et al.]

Oxford, UK : Munksgaard International Publishers

Clinical oral implants research 14 (2003), S. 0

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ISSN: 1600-0501

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Abstract: The accuracy of surgical drilling guides was assessed for placement of zygoma implants. Six zygoma fixtures of length 45 mm (Nobel Biocare, Göteborg, Sweden) were placed in three formalin-fixed human cadavers using surgical drilling guides. The fabrication of these custom-made drilling guides was based on three-dimensional computerized tomography (3D-CT) data for the maxillary-zygomatic complex. The installation of the implants was simulated preoperatively using an adopted 3D-CT planning system. In addition, anatomical measurements of the zygomatic bone were performed on the 3D images. The preoperative CT images were then matched with postoperative ones in order to assess the deviation between the planned and installed implants. The angle between the planned and actually placed implants was 〈 3° in four out of six cases. The largest deviation found at the exit point of one of the six implants was 2.7 mm. The present study showed that the use of surgical drilling guides should be encouraged for zygoma implant placement because of the lengths of the implants involved and the anatomical intricacies of the region.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1034/j.1600-0501.2003.140118.x

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Automated contour detection of the left ventricle in short axis view in 2D echocardiograms (1993)

Maes, Luc ; Bijnens, Bart ; Suetens, Paul ; [et al.]

Springer

Machine vision and applications 6 (1993), S. 1-9

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ISSN: 1432-1769

Keywords: Contour detection ; Dynamic programming ; Two-dimensional echocardiograms

Source: Springer Online Journal Archives 1860-2000

Topics: Computer Science

Notes: Abstract This paper describes a semi-automatic system for the extraction of the endocardial border on a sequence of two-dimensional short axis echocardiograms. The delineation in the images is based on a dynamic programming technique which takes into consideration the radial and tangent gradient, the intensity, the smoothness of the extracted contour and a rough estimation of the location of the contour, derived from the previous frame of the time sequence. For the first frame, the user is asked to specify a region of interest. Within this region of interest, the developed system defines a circle as a rough estimation of the location of the endocardium. The developed system allows iteration of the delineation process to obtain a more detailed outline of the endocardium. The outlined contours on successive echo-frames are verified as the system compares their areas. This verification is important since the delineation process is purely sequential and errors occurring in an intermediate frame of the time sequence may influence the results in the subsequent frames.