1523 results about "Projection plane" patented technology

In order to so improve a surgical system for connecting body tissue, comprising a surgical instrument having two tool elements movable relative to each other, each of which comprises a high-frequency electrode, the high-frequency electrodes, in an approach position of the tool elements, defining a minimum distance from each other, lying opposite each other and facing each other, that an overstretching of connections of parts of body tissue, in particular, made by a flow of current, is avoided when removing the surgical instrument, it is proposed that the instrument comprise a shaft at the distal end of which at least a first one of the tool elements is arranged or formed, and that a second tool element be adapted to be moved from an operating position, in which it is adapted for movement into the approach position, into a removal position and / or vice versa, a surface area of a perpendicular projection of the second tool element onto a projection plane extending perpendicularly to the shaft direction in the region of the second tool element being smaller in the removal position than in the operating position.

A method of displaying at least one point-of-interest of a body during an intra-body medical procedure. The method is effected by (a) establishing a location of the body; (b) establishing a location of an imaging instrument being for imaging at least a portion of the body; (c) defining at least one projection plane being in relation to a projection plane of the imaging instrument; (d) acquiring at least one point-of-interest of the body; and (e) projecting said at least one point-of-interest on said at least one projection plane; such that, in course of the procedure, the locations of the body and the imaging instrument are known, thereby the at least one point-of-interest is projectable on the at least one projection plane even in cases whereby a relative location of the body and the imaging instrument are changed.

Apparatus that uses a large transflective mirror to extend a virtual reality system such as a virtual table that employs a projection plane to produce the virtual reality. The transflexive mirror is positioned relative to the projection plane such that the plane of the mirror intersects the projection plane and the angle of the mirror relative to the projection plane is such that the user of the system who looks at the mirror sees the projection plane reflected in the mirror. The virtual reality system is responsive to the position of the mirror and the direction in which a user is looking and produces separate virtual realities on the projection plane: one when the user is looking at the mirror and another when the user is looking at the projection plane. The virtual reality that the user sees when looking at the mirror may or may not be coherent with the virtual reality that the user sees when looking at the projection plane. The two virtual realities may share a global coordinate system that is divided into two parts by the plane of the mirror, and what the user sees when looking into the mirror may be what the user would see looking through a window into the part of the global coordinate system behind the mirror. Because the mirror is transflective, real objects whose locations are known to the virtual reality system can he placed behind the mirror and the virtual reality reflected in the mirror may be used to augment the real objects. One use of such augmentation is virtual trial assembly of a virtual mockup with a physical mockup.

There is provided a position detection system including an imaging unit to capture an image of a projection plane of an electromagnetic wave, an electromagnetic wave emission unit to emit the electromagnetic wave to the projection plane, a control unit to control emission of the electromagnetic wave by the electromagnetic wave emission unit, and a position detection unit including a projected image detection section to detect a projected image of an object existing between the electromagnetic wave emission unit and the projection plane based on a difference between an image of the projection plane captured during emission of the electromagnetic wave by the electromagnetic wave emission unit and an image of the projection plane captured during no emission of the electromagnetic wave, and a position detection section to detect a position of the object based on a position of the projected image of the object.

The invention provides improvements in reconstructive imaging of the type in which a volume is reconstructed from a series of measured projection images (or other two-dimensional representations) generated by projection of a point x-ray source (or other radiation source), positioned at a distinct focus, through the volume to a plane at which the respective projection image is acquired (“detector plane”). In one aspect, the improvements are with respect to back-projecting a two-dimensional representation lying in the detector plane (representing, for example, a difference between an originally-acquired measured projection image and a subsequently-generated estimate thereof) to generate three-dimensional representation (which can be used, for example, to update an estimate of the volume). According to this aspect, for each of one or more slices of the 3D representation parallel to the projection plane and for each distinct focus at which a projection is generated, the following steps are performed in connection with the back-projection: (i) warping the first 2D representation to generate a second 2D representation by applying to the first 2D representation a selected linear mapping, where that selected linear mapping would map, in order to match dimensions of the respective slice within the 3D representation, a region defined by projection, at the respective focus, of corners of that slice onto the detector plane, and (ii) incrementing values of each of one or more voxels of the respective slice by an amount that is a function of a value of a correspondingly indexed pixel of the second 2D representation. A related aspect provides improvements with respect to forward-projecting, as well as in iterative (and non-iterative) methodologies that incorporate both back-projection and forward-projection.