Abstract: A method and system for reducing radiation exposure from an imaging system including determining an entry location, operating the imaging system so as to cause the imaging system to emit radiation having a radiation intensity, controlling the radiation intensity in a manner responsive to the entry location so as to create image data and processing the image data so as to create processed image data. In an alternative embodiment, a medium encoded with a machine-readable computer program code for reducing radiation exposure from an imaging system, the medium including instructions for causing a controller to implement the aforementioned method.

Abstract: A method for reconstructing images of a subject in a variable-angle helical-scan CT scanner including an X-ray tube, a detector array, and a bed, the method comprising: angling the translation axis and the rotation axis at an acute angle relative to one another; rotating the X-ray tube about the rotation axis while translating the bed along the translation axis through a plane of rotation of the tube, whereby the X-ray tube describes a helical path relative to the subject; acquiring first and second views of the subject at the same effective rotational angle about the axis of rotation, said views comprising X-ray attenuation data received from elements of the array; producing a planar corrected image slice by interpolation of the data in different views, wherein the data is generated by non-corresponding elements in the different views; and repeating the above steps at respective positions at a plurality of rotational angles of the X-ray tube.

Abstract: Apparatus for producing multiple image slice data responsive to incident radiation, comprising:

Abstract: Apparatus for producing multiple image slice data responsive to incident radiation passing through an object. The apparatus includes a detector array having a plurality (p) of parallel rows of detector elements which receive such incident radiation and generate signals therefrom, each of which rows is characterized by a width measured prior to collimation in the direction perpendicular to a long dimension thereof; and signal processing circuitry which receives signals from the detector elements and which combines the signals in a first combination mode and in at least m additional combination modes. In the first combination mode, the circuitry forms a set of n groups of rows, each such group of rows having an effective group width substantially equal to the effective group width of each of the other groups in the set. In each of the m additional combination modes, the circuitry forms different sets of n groups of rows, each such set having a different effective group width common to all groups in the set.

Abstract: A method for reconstructing one or more non-axial image slices in a CT scanner, comprising: acquiring X-ray attenuation data over an axial range; and processing the attenuation data to determine CT values at a plurality of points along one or more surface corresponding respectively to each one or more non-axial image slices, wherein processing the attenuation data comprises back-projecting the data directly to the plurality of points along each of the one or more surfaces.

Abstract: A computerized tomography system wherein the X-ray source rotates about the subject and moves axially relative to the subject to provide a helical scan. A detector array includes a plurality of rows of detector elements extending axially and each element being of the same size to enable the acquisition of multiple planar data per rotation. The acquired data is reformatted into planar data by interpolating as a function of both the axial subject position and the axial detector element position.

Abstract: A Computerized Tomographic (CT) helical scanner system including multiple, separate x-ray sources mounted on the same gantry, each irradiating different two-dimensional detectors at any given time to simultaneously acquire data from multiple slices and combining the data obtained from the multiple slices to provide images either of individual slices or combined slices.