Point inputting device and method for three-dimensional images

G - Physics – 06 – F

Patent

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Details

G06F 3/01 (2006.01) G06T 17/40 (2006.01) G06T 15/00 (2006.01)

Patent

CA 2411193

Where an arbitrary point on an image is designated in the field of a medical image, it is generally designated on a sectional image, and an arbitrary point on a three-dimensional image cannot be designated. According to the invention the orientation of the three-dimensional image is controlled in a first direction corresponding to the operation of the user. When an arbitrary point of the three-dimensional image is designated by the user, a plane passing through that point and normal to a display screen is created and stored. Next, the three-dimensional image is oriented in a second direction, and an arbitrary point is designated in the second direction by the user. Then, there is created a straight line which passes through that point and which is normal to the display screen. Then, the coordinates of the intersection the stored screen and the straight line are determined, and the point having the coordinates of the intersection point is displayed on the three-dimensional image. As a result, an arbitrary point on the three-dimensional image can be designated by a simple operation.

Pour désigner un point arbitraire sur une image dans le domaine de l'imagerie médicale, on désigne généralement ledit point sur une image de coupe, ce qui rend toute désignation d'un point arbitraire sur une image tridimensionnelle impossible. Le dispositif selon l'invention permet de commander l'orientation de l'image tridimensionnelle dans une première direction, qui correspond à l'action de l'utilisateur. Lorsque l'utilisateur désigne un point arbitraire de l'image tridimensionnelle, le dispositif crée et enregistre un plan qui passe par ledit point et qui est perpendiculaire à un écran d'affichage. Ensuite, l'image tridimensionnelle est orientée dans une seconde direction, et l'utilisateur désigne un point arbitraire dans cette seconde direction. Le dispositif crée alors une ligne droite qui passe par ce point et qui est perpendiculaire à l'écran d'affichage, et détermine les coordonnées de l'intersection entre l'écran enregistré et la ligne droite, de manière à afficher, sur l'image tridimensionnelle, le point dont les coordonnées correspondent au point d'intersection. Cette simple opération permet ainsi de désigner un point arbitraire sur une image tridimensionnelle.

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