Dr. Walter Y. H. Lam Profile

Dr. Walter Y. H. Lam

at Univ of Hong Kong

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Proceedings Article | 27 February 2015 Paper

Image calibration and registration in cone-beam computed tomogram for measuring the accuracy of computer-aided implant surgery

Walter Lam, Henry Ngan, Peter Wat, Henry Luk, Tazuko Goto, Edmond Pow

Proceedings Volume 9405, 94050A (2015) https://doi.org/10.1117/12.2083341

KEYWORDS: Teeth, Surgery, Image registration, Calibration, Neck, Image restoration, Dentistry, Bone, 3D image processing, Tissues

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Medical radiography is the use of radiation to “see through” a human body without breaching its integrity (surface). With computed tomography (CT)/cone beam computed tomography (CBCT), three-dimensional (3D) imaging can be produced. These imagings not only facilitate disease diagnosis but also enable computer-aided surgical planning/navigation. In dentistry, the common method for transfer of the virtual surgical planning to the patient (reality) is the use of surgical stent either with a preloaded planning (static) like a channel or a real time surgical navigation (dynamic) after registration with fiducial markers (RF). This paper describes using the corner of a cube as a radiopaque fiducial marker on an acrylic (plastic) stent, this RF allows robust calibration and registration of Cartesian (x, y, z)- coordinates for linking up the patient (reality) and the imaging (virtuality) and hence the surgical planning can be transferred in either static or dynamic way. The accuracy of computer-aided implant surgery was measured with reference to coordinates. In our preliminary model surgery, a dental implant was planned virtually and placed with preloaded surgical guide. The deviation of the placed implant apex from the planning was x=+0.56mm [more right], y=- 0.05mm [deeper], z=-0.26mm [more lingual]) which was within clinically 2mm safety range. For comparison with the virtual planning, the physically placed implant was CT/CBCT scanned and errors may be introduced. The difference of the actual implant apex to the virtual apex was x=0.00mm, y=+0.21mm [shallower], z=-1.35mm [more lingual] and this should be brought in mind when interpret the results.

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