Abstract: An imaging apparatus comprises a rotatable gantry system positioned at least partially around a patient support; a first source of radiation coupled to the rotatable gantry system, the first source of radiation configured for imaging radiation; a second source of radiation coupled to the rotatable gantry system; and a first radiation detector coupled to the rotatable gantry system and laterally movable relative to a central beam of the first source of radiation to receive radiation from at least the first source of radiation over various fields of view. Alternative configurations of the imaging apparatus and methods of using the imaging apparatus are also provided.

Abstract: An imaging apparatus comprises a rotatable gantry system positioned at least partially around a patient support; a first source of radiation coupled to the rotatable gantry system, the first source of radiation configured for imaging radiation; a second source of radiation coupled to the rotatable gantry system; and a first radiation detector coupled to the rotatable gantry system and laterally movable relative to a central beam of the first source of radiation to receive radiation from at least the first source of radiation over various fields of view. Alternative configurations of the imaging apparatus and methods of using the imaging apparatus are also provided.

Abstract: A computed tomography (CT) system includes a rotatable gantry having an opening to receive an object to be scanned, a high-voltage generator, an x-ray tube positioned on the gantry to generate x-rays through the opening, a pixelated detector positioned on the gantry to receive the x-rays, and a computer. The computer is programmed to obtain a scout image of the object, calculate an equivalent diameter of a water cylinder based on the scout image over a length of the scout image, calculate a major axis and a minor axis for an equivalent ellipse over the length, calculate, based on a noise index and based on the equivalent diameter as the function of the length, an mA modulation as a function of the length, and obtain image data of the object by modulating an mA applied to the x-ray tube based on the calculated mA modulation.

Abstract: A computed tomography (CT) system includes a rotatable gantry having an opening to receive an object to be scanned, an x-ray tube having an anode, the x-ray tube positioned on the gantry to generate x-rays from a focal spot of the anode and through the opening, a pixelated detector positioned on the gantry to receive the x-rays from which CT projection data is generated, and a computer. The computer programmed to acquire step-and-shoot (SAS) full scan CT projection data for a first scan and for a first rotation, and for a second scan and for a second rotation, wherein the first scan is axially offset from the second scan, interpolate across the first and second scans to generate interpolated projection data, and reconstruct an image based on the interpolated projection data.

Abstract: A computed tomography (CT) system includes a rotatable gantry having an opening to receive an object to be scanned, a high-voltage generator, an x-ray tube positioned on the gantry to generate x-rays through the opening, a pixelated detector positioned on the gantry to receive the x-rays, and a computer. The computer is programmed to obtain a scout image of the object, calculate an equivalent diameter of a water cylinder based on the scout image over a length of the scout image, calculate a major axis and a minor axis for an equivalent ellipse over the length, calculate, based on a noise index and based on the equivalent diameter as the function of the length, an mA modulation as a function of the length, and obtain image data of the object by modulating an mA applied to the x-ray tube based on the calculated mA modulation.

Abstract: Various methods and systems are provided for correcting contrast banding artifacts across multiple acquisitions in reconstructed images. In one embodiment, a method for computed tomography imaging comprises generating an original image comprising multiple subvolumes, segmenting the original image into different structures for each subvolume, selectively applying a mask-based correction through each area of subvolume that includes continuous structures to generate an updated image, and performing streak correction between the original image and the updated image to generate a final image. In this way, image quality may be improved without adjusting anatomical structures in an image.

Abstract: Various methods and systems are provided for correcting contrast banding artifacts across multiple acquisitions in reconstructed images. In one embodiment, a method for computed tomography imaging comprises generating an original image comprising multiple subvolumes, segmenting the original image into different structures for each subvolume, selectively applying a mask-based correction through each area of subvolume that includes continuous structures to generate an updated image, and performing streak correction between the original image and the updated image to generate a final image. In this way, image quality may be improved without adjusting anatomical structures in an image.