Abstract: Provided are a rotary device for fluid power generation and a fluid power generation device that are capable of converting the kinetic energy of a fluid to an electric energy. By utilizing a longitudinal vortex as a driving force, a rotary body such as a cylinder as a high-strength and tough wing-shaped member can be rotated, and power can be efficiently generated in a wide range of flow rate without letting the longitudinal vortex disappear even if the flow rate changes in a wide range. This rotary device for power generation includes a rotary body 3; and a wake body 8 that is a distance away from the rotary body 3 toward the downstream side of a flow direction 10 of the fluid, and has at least one crossover section at which the wake body 8 intersects with the rotary body 3.

Abstract: The background projection data of a background region CT image in the X-ray emission path is calculated. Using measurement projection data and background projection data, the measurement projection data of local regions is calculated. Local region CT images are calculated on the basis of local measurement projection data, and the projection data of a local region CT image in the X-ray emission path is calculated. On the basis of local calculation projection data and local measurement projection data, local CT images are iteratively corrected. When creating background region CT images or calculating background projection data, the cause of calculation accuracy deterioration is eliminated by the use of processing such as smoothing, and without deterioration of CT value accuracy in regions other than the target region, a high-quality CT image is obtained.

Abstract: An X-ray CT apparatus includes: an X-ray generating unit configured to generate an X ray; an X-ray detecting unit including a plurality of X-ray detectors, each configured to detect the X ray generated from the X-ray generating unit and transmitted through an object; and an image generating unit configured to correct and reconstruct signals acquired by the X-ray detecting unit. While crosstalk correction of a plurality of the X-ray detectors is performed at the image generating unit, correction of a locally attenuating component is previously performed and correction of a whole component of the crosstalk is performed when the image is reconstructed.

Abstract: In a multi-source X-ray CT scanner having multiple X-ray sources, an imaging FOV size is fixed. In the X-ray CT scanner, a position of at least one of multiple X-ray generators is movable in the Z-axis direction (in the rotation axis direction). It is further possible to configure such that while shifting the X-ray generator, the rotation speed of the rotating plate is kept to be a predetermined value or less. Highly precise CT measurement is implemented as to various imaging FOV sizes, without exposing the test subject to ineffective radiation.

Abstract: If the calculation accuracy of a CT image of an entire subject is low, the accuracy of local-region measurement projection data deteriorates and local-region CT images cannot be corrected so as to have good accuracy. In the present invention, a background region CT image is created on the basis of measurement projection data (154-157). The background projection data of a background region CT image in the X-ray emission path is calculated (158). Using measurement projection data and background projection data, the measurement projection data of local regions is calculated (159, 160). Local region CT images are calculated on the basis of local measurement projection data, and the projection data of a local region CT image in the X-ray emission path is calculated (161). On the basis of local calculation projection data and local measurement projection data, local CT images are iteratively corrected (162-164).

Abstract: In a multi-source X-ray CT scanner having multiple X-ray sources, an imaging FOV size is fixed. In the X-ray CT scanner, a position of at least one of multiple X-ray generators is movable in the Z-axis direction (in the rotation axis direction). It is further possible to configure such that while shifting the X-ray generator, the rotation speed of the rotating plate is kept to be a predetermined value or less. Highly precise CT measurement is implemented as to various imaging FOV sizes, without exposing the test subject to ineffective radiation.

Abstract: An X-ray CT apparatus includes: an X-ray generating unit configured to generate an X ray; an X-ray detecting unit including a plurality of X-ray detectors, each configured to detect the X ray generated from the X-ray generating unit and transmitted through an object; and an image generating unit configured to correct and reconstruct signals acquired by the X-ray detecting unit. While crosstalk correction of a plurality of the X-ray detectors is performed at the image generating unit, correction of a locally attenuating component is previously performed and correction of a whole component of the crosstalk is performed when the image is reconstructed.