Abstract: An apparatus and method for expanding the FOV of a truncated computed tomography (CT) scan. An iterative calculation is performed on the original CT image to produce an estimate of the image. The calculated estimate of the reconstructed image includes the original image center and a estimate of the truncated portion outside the image center. The calculation uses an image mask with the image center as one boundary.

Abstract: An apparatus and method for expanding the FOV of a truncated computed tomography (CT) scan. An iterative calculation is performed on the original CT image to produce an estimate of the image. The calculated estimate of the reconstructed image includes the original image center and a estimate of the truncated portion outside the image center. The calculation uses an image mask with the image center as one boundary.

Abstract: An apparatus and method for expanding the FOV of a truncated computed tomography (CT) scan. An iterative calculation is performed on the original CT image to produce an estimate of the image. The calculated estimate of the reconstructed image includes the original image center and a estimate of the truncated portion outside the image center. The calculation uses an image mask with the image center as one boundary.

Abstract: A method of reducing ring artifacts in tomographic images including providing an original digitized projection measurement comprising a plurality of intensities corresponding to a domain of points on an 2-dimensional grid, operating on said original projection measurement with a filter wherein features of high radial frequency and low angular frequency are attenuated, forming a weighted mixture of said filtered projection measurement and said original projection measurement wherein ring artifacts in said original tomographic image are substantially reduced, and reconstructing the projection measurement to form a tomographic image. Alternatively, a first tomographic image is reconstructed from said original projection measurement, a second tomographic image is reconstructed from said filtered projection measurement, and a weighted mixture is formed from said first tomographic image and said second tomographic image.

Abstract: A system for dual-mode medical imaging is provided. The system features components for PET imaging as well as for ultrasonic imaging, with an internal probe that has components to provide capability for both. The system provides cost-efficient PET imaging for smaller regions and organs of interest than conventional full body PET scanner apparatus.

Abstract: An apparatus and method for expanding the FOV of a truncated computed tomography (CT) scan. An iterative calculation is performed on the original CT image to produce an estimate of the image. The calculated estimate of the reconstructed image includes the original image center and a estimate of the truncated portion outside the image center. The calculation uses an image mask with the image center as one boundary.

Abstract: A method of reducing ring artifacts in tomographic images including providing an original digitized projection measurement comprising a plurality of intensities corresponding to a domain of points on an 2-dimensional grid, operating on said original projection measurement with a filter wherein features of high radial frequency and low angular frequency are attenuated, forming a weighted mixture of said filtered projection measurement and said original projection measurement wherein ring artifacts in said original tomographic image are substantially reduced, and reconstructing the projection measurement to form a tomographic image. Alternatively, a first tomographic image is reconstructed from said original projection measurement, a second tomographic image is reconstructed from said filtered projection measurement, and a weighted mixture is formed from said first tomographic image and said second tomographic image.

Abstract: The apparatus and method include performing a medical image scan, including providing a contrast agent, performing a first scan at a first energy level, and performing a second scan at a second energy level, wherein radiation exposure to a patient of the first scan and the second is comparable to a single scan at a standard energy level.

Abstract: An x-ray diagnostic system wherein verbal, hands-free data input is available to the user for communicating with the components of the system. The components of the system, which are interconnected via a signal transmission path, include a speech recognition system for data input and a communication device designed so that available and executed commands are reproduced thereby.