Real-time sensing of mouth 3-D position and orientation

Grigore C. Burdea; Stanley M. Dunn; Matsumita Mallik; Heesung Jun

doi:10.1117/12.18821

1 July 1990 Real-time sensing of mouth 3-D position and orientation

Grigore C. Burdea, Stanley M. Dunn, Matsumita Mallik, Heesung Jun

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18821
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

A key problem in using digital subtraction radiography in dentistry is the ability to reposition the X-ray source and patient so as to reproduce an identical imaging geometry. In this paper we describe an approach to solving this problem based on real time sensing of the 3-D position and orientation of the patient's mouth. The research described here is part of a program which has a long term goal to develop an automated digital subtraction radiography system. This will allow the patient and X-ray source to be accurately repositioned without the mechanical fixtures that are presently used to preserve the imaging geometry. If we can measure the position and orientation of the mouth, then the desired position of the source can be computed as the product of the transformation matrices describing the desired imaging geometry and the position vector of the targeted tooth. Position and orientation of the mouth is measured by a real time sensing device using low-frequency magnetic field technology. We first present the problem of repositioning the patient and source and then outline our analytic solution. Then we describe an experimental setup to measure the accuracy, reproducibility and resolution of the sensor and present results of preliminary experiments.

Citation Download Citation

Grigore C. Burdea, Stanley M. Dunn, Matsumita Mallik, and Heesung Jun "Real-time sensing of mouth 3-D position and orientation", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18821

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