Abstract: Ocean-based gear equipped with Global Positioning System (GPS) shares position to either single or multiple users. Position data from an ocean-based device are sent either to a cloud-hosted database or vessel transceiver, then displayed on either a mobile app via multiple login accounts, a vessel-mounted GPS plotter that is capable of sharing data over the internet, or a satellite-connected mobile device capable of receiving and displaying Short Message Service (SMS) messages or emails. The Vessel Transceiver device is designed to share data from gear to vessel via radio frequency, as well as vessel to vessel via satellite network, without internet connectivity. Position data are provided to either one user or multiple users on the ocean or on land via various communication arrangements.

Abstract: A method for magnetic resonance imaging (MRI) using a radial cone k-space trajectory is provided. The radial cone k-space trajectory is defined by the application of a radial magnetic field gradient and one or more oscillating magnetic field gradients. The amplitude of the radial magnetic field gradient increases with time before decreasing with time. While the amplitude of the radial magnetic field gradient is decreasing, the one or more oscillating magnetic field gradients are applied. As a result, the radial cone k-space trajectory is one that is oriented along an axis and that extends outward from an origin along a substantially radial trajectory before extending outward from the origin while circumscribing a conical volume having a radius that increases nonlinearly with distance from the origin.

Abstract: A method for magnetic resonance imaging (MRI) using a radial cone k-space trajectory is provided. The radial cone k-space trajectory is defined by the application of a radial magnetic field gradient and one or more oscillating magnetic field gradients. The amplitude of the radial magnetic field gradient increases with time before decreasing with time. While the amplitude of the radial magnetic field gradient is decreasing, the one or more oscillating magnetic field gradients are applied. As a result, the radial cone k-space trajectory is one that is oriented along an axis and that extends outward from an origin along a substantially radial trajectory before extending outward from the origin while circumscribing a conical volume having a radius that increases nonlinearly with distance from the origin.

Abstract: An image reconstruction method includes reconstructing a composite image of a subject using a conventional reconstruction method. The composite image employs the best information available regarding the subject of the scan and this information is used to constrain the reconstruction of a highly undersampled image frames or improve the SNR of image frames. A blurred and normalized weighting image is produced from image frame data, and this normalized weighting image is multiplied by the composite image.

Abstract: Mask projection views are obtained prior to the arrival of a contrast agent during a dynamic contrast enhanced MRA study. After the arrival of the contrast agent, a set of undersampled contrast enhanced projection views are obtained for each of a plurality of time frames. Corresponding mask projection views are subtracted from the contrast enhanced projection views to provide sparse contrast enhanced projection view sets. A phase contrast scan of a region of interest is performed prior to or after the arrival of the contrast agent. The phase contrast image is used as a composite image in a HYPR reconstruction of the sparse projection view sets to produce first pass contrast enhanced images. Iterative HYPR reconstructions can also be performed to remove venous information from the reconstructed images.

Abstract: Mask projection views are obtained prior to the arrival of a contrast agent during a dynamic contrast enhanced MRA study. After the arrival of the contrast agent, a set of undersampled contrast enhanced projection views are obtained for each of a plurality of time frames. Corresponding mask projection views are subtracted from the contrast enhanced projection views to provide sparse contrast enhanced projection view sets. A phase contrast scan of a region of interest is performed prior to or after the arrival of the contrast agent. The phase contrast image is used as a composite image in a HYPR reconstruction of the sparse projection view sets to produce first pass contrast enhanced images. Iterative HYPR reconstructions can also be performed to remove venous information from the reconstructed images.

Abstract: A series of velocity encoded MR image frames are acquired. To increase the temporal resolution of the acquired image frames radial projections are acquired and each image frame is highly undersampled. The radial projections for each velocity encoding direction are interleaved throughout the scan and a composite phase image is reconstructed from these and used to reconstruct a velocity image for each image frame in a highly constrained backprojection method.

Abstract: Techniques for using a declarative programming language to automatically generate imperative language computer programs (such as the get, set, enable, and disable commands of the Windows® PowerShell scripting language) that perform administrative tasks of computing environments. A code generator 150 is operative to process a declarative language document, which includes at least three hierarchically-related data structures. The first data structure references certain administrative commands; the second data structure references parameters accepted by the commands; and the third data structure provides pointers to configuration data associated with the parameters. The document is processed in accordance with a set of rules to produce imperative-language execution routines that call sub-routines and pass variables thereto, which enables differences between parameters and configuration data to be mitigated through mapping.

Abstract: An image reconstruction method includes reconstructing a composite image of a subject using a conventional reconstruction method. The composite image employs the best information available regarding the subject of the scan and this information is used to constrain the reconstruction of a highly undersampled image frames or improve the SNR of image frames. A blurred and normalized weighting image is produced from image frame data, and this normalized weighting image is multiplied by the composite image.

Abstract: A phase contrast image is produced using a 3D projection reconstruction pulse sequence. A high velocity-to-noise image is produced by using a LOW VENC motion encoding gradient. Phase wrap errors caused by high velocity flow is corrected using phase information in a HIGH VENC image produced from highly undersampled data acquired during the same scan.