Positioning system for a X-ray tomography

X-ray or gamma ray systems or devices – Specific application – Dental panoramic

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Details

378 39, 378180, 378205, A61B 614

Patent

active

049742434

ABSTRACT:
An instrument and system precisely positions a selected cranial implant site for X-ray tomography. The system and method involve first positioning the patient accurately in a straight-ahead reference position using a cephalostat, with the ears positioned in the vertical plane containing all X-ray axes and at a particular reference level which may be the level of horizontal X-ray projection. The apparatus includes a pointer system which pivots on the cephalostat vertical center of rotation to measure the angle to a site of interest on the mandible or maxilla, with an adjustable pointer for measuring the height and radial distance of the site from reference positions. The pointer may be extended to directly contact the site of interest on the patient. The information thus obtained gives polar coordinates of the site. Calculations are made to convert this information to a set of cartesian coordinates for use in repositioning the patient to position the site accurately in the vertical plane and at the tomographic intersection point. An additional calculation is made from a derived formula to determine the angle of tangency to the mandibular arc and the required further adjustment to compensate for this angle. The apparatus includes translating stages for X, Y and Z translational adjustments of the cephalostat to accurately position the patient with the mandible or maxilla site at isocenter with the tangent of the mandibular curve parallel to the central X-ray beam axis.

REFERENCES:
patent: 4907251 (1990-03-01), Mork et al.

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