Patent ID: 8681931

Claim:
A medical computed tomography apparatus, which apparatus includes a support construction which is arranged to support a substantially ring-shaped structure supporting imaging means, which imaging means include a source of radiation and a receiver of image information, which imaging means are arranged within said substantially ring-shaped structure supporting the imaging means substantially on opposite sides of each other and movable within said ring-shaped structure supporting the imaging means, which apparatus includes in said ring-shaped structure supporting the imaging means an examination opening wherein the object to be imaged is positionable for imaging, and in which apparatus said substantially ring-shaped structure supporting the imaging means is arranged movable with respect to said support construction at least in the vertical direction and, on the other hand, turnable with respect to an axis substantially parallel with the horizontal diagonal of a radial cross-section of the ring-shaped structure in question, characterized in that said substantially ring-shaped structure supporting the imaging means includes an outer cover the cross-section of which in a direction perpendicular with respect to the central axis of said ring-shaped structure is for its prevailing portion arranged substantially of the shape of an arch of a circle but to comprise a cut, and within the sector covered by the cut the distance from the center of said arch of a circle to the edge of the outer cover is shorter than within said portion of the outer cover substantially of the shape of an arch of a circle, that said examination opening is arranged for its prevailing portion substantially of the shape of an arch of a circle but to comprise an extension, and within the sector covered by the extension the distance from the center of said arch of a circle to the edge of the examination opening is longer than within said prevailing portion of the examination opening substantially of the shape of an arch of a circle, and that the imaging means are arranged movable with respect to a center of rotation such that said receiver of image information is arranged to move closer to said center of rotation than the focus of said source of radiation and the outmost dimensions of said extension and cut from the center of rotation of the imaging means are arranged such that the source of radiation arranged to move farther from the center of rotation is able to move outside the extension of the examination opening and the receiver of image information inside the cut arranged to the outer cover of the structure supporting the imaging means.