Method and apparatus for evaluating ct image registration

A - Human Necessities – 61 – B

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A61B 6/03 (2006.01) A61B 6/12 (2006.01) G06F 17/15 (2006.01) G06F 19/00 (2006.01)

Patent

CA 2201425

A method for correlating accuracy of computer tomography (CT) image resolution is described. Small radio-opaque markers having a diameter less than one slice width of a CT scan are embedded in the object, such as a bony skeletalmember, to be measured, the object is then CT scanned so that the radio-opaque markers appear in at two slices of the scan. The markers are also physically located by detecting them with a sensor, such as a positioning pointer. Also described is one form of marker comprising a tantalum sphere mounted in a ceramic, preferably alumina, pin.

L'invention est une méthode de corrélation portant sur la résolution des images de tomodensitométrie. De petits marqueurs opaques aux rayons X d'un diamètre inférieur à l'épaisseur d'une tranche de balayage tomodensitométrique sont incorporés à l'objet à examiner, qui peut être un os par exemple. Cet objet est ensuite balayé de façon que les marqueurs opaques apparaissent dans deux tranches de balayage. Les marqueurs sont par ailleurs localisés au moyen d'un capteur, tel qu'un pointeur de position. Un type de marqueur constitué d'une sphère de tantale montée dans une broche de céramique, de préférence de l'alumine, est également décrit dans l'invention.

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