Abstract: Some embodiments include determination of a first projection image of a phantom based on first imaging geometry parameters associated with a first radiation-based imaging system and on a virtual model of the phantom, acquisition of a second projection image of the phantom based on radiation emitted from the first radiation-based imaging system, the phantom located at a first position, and determination of a difference between the first projection image and the second projection image. Second imaging geometry parameters are determined based on the first imaging geometry parameters and the difference between the first projection image and the second projection image, a third projection image of the phantom is determined based on the second imaging geometry parameters and on the virtual model of the phantom, and a fourth projection image of the phantom located at the first position is acquired based on radiation emitted from the first radiation-based imaging system.

Abstract: A capacitive membrane ultrasound transducer is provided. Membranes or other microelectromechanical devices are provided in a 3-1 geometry, allowing application of an electric field substantially perpendicular to a range dimension. The membranes are on a plurality of different respective planes more parallel than perpendicular with each other, and the planes are more perpendicular than parallel with the faces of the elements or transducer.

Abstract: Circuits for detecting faults in variable resistive position feedback sensors common in the use of motion control systems, provide a filter coupled to an output signal of the variable resistive position sensor for processing the signal to detect noise indicative of intermittent faults. A memory stores occurrences of signals from the filter. The memory can activate an alarm which indicates that a failure is detected. The circuits are particularly applicable to medical imaging systems such as SPECT, PET or MRI systems which contain a multiplicity of moving components that require accurate motion control and positioning.

Abstract: Beamforming for N elements in performed in log(N) steps of complexity O(N). The signals measured at each element are treated as a receive beam formed by that element with a beam width equal to the element pattern or the width of the transmit illumination. In each of multiple stages, the number of elements is halved by effectively doubling the pitch. The number of beams formed by each element is doubled by narrowing the beam width by a factor of 2 in sin(?). Since steering and focusing are separated, a single set of delays are applied to each element signal individually prior to the multi-stage beam forming for each finite depth. The data is in a sector format, but by using two beamforming steps, data in a Vector® format is provided.

Abstract: A simple, low cost circuit with only passive components, and thus low power consumption, is provided for baseline restoration of an AC coupled signal. The circuit includes a passive network of diodes arranged in a star configuration and an RF-transformer. A differential signal strategy may be employed by including a differential amplifier at the input and output of the passive network.

Abstract: Disclosed are a system and method of selecting one or more operational parameters of an ultrasonic imaging system. In particular, methods and means are disclosed for automatically or semi-automatically determining a best operating frequency, or for determining whether a system should operate in a fundamental imaging mode or a harmonic imaging mode.

Abstract: A method for determining a blob-like structure in a target image includes receiving an input target image is received, determining a mean curvature of the input target image, smoothing the mean curvature is smoothed using a scale that determines a size of the blobs to be found, finding a blob-like structure in the input target image as a portion of the input target image where a smoothed curvature is higher than a threshold value, and outputting a result including an indication of the blob-like structure.

Abstract: Some aspects include acquisition of a first plurality of projection images of a volume using a megavoltage x-ray source, each of the first plurality of projection images associated with a respective one of a first plurality of locations of the megavoltage x-ray source, acquisition of a second plurality of projection images of the volume using a kilovoltage x-ray source, each of the second plurality of projection images associated with a respective one of a second plurality of locations of the kilovoltage x-ray source, and performance of digital tomosynthesis reconstruction to generate a three-dimensional image of the volume based on the first plurality of projection images and the second plurality of projection images. The first axis may be perpendicular to the second axis.

Abstract: A method for differentiating between a blood vessel bifurcation and a bleeding blood vessel in an ultrasound volume includes performing vessel segmentation on the ultrasound volume, calculating vessel centerlines for the segmented vessels, automatically detecting a bifurcation candidate using the calculated vessel centerlines, placing a first marker at a predetermined distance before the detected bifurcation candidate, placing a second marker at a predetermined distance after the bifurcation candidate, placing a third marker at a predetermined distance alone a potential vessel branch of the bifurcation candidate, acquiring spectral Doppler waveform data at each of the three markers, and comparing the acquired spectral Doppler waveform data for each of the three markers to determine whether the bifurcation candidate is a point of internal bleeding.

Abstract: A method for visualization of dynamic three-dimensional (3D) virtual objects comprises storing a plurality of static 3D key-models respectively describing a dynamic 3D object in at least one of a number of poses and shapes; and rendering the dynamic 3D object by interpolation of the 3D key-models by performing the interpolation in a vertex shader program of a programmable graphics processing unit (GPU).

Abstract: A method for detecting bone and bone disease using MRI images includes: detecting and segmenting bone borders using dark bone border intensity information from an MRI image; and detecting bone disease within a segmented image region.

Abstract: Described herein is a framework for automatically classifying a structure in digital image data are described herein. In one implementation, a first set of features is extracted from digital image data, and used to learn a discriminative model. The discriminative model may be associated with at least one conditional probability of a class label given an image data observation Based on the conditional probability, at least one likelihood measure of the structure co-occurring with another structure in the same sub-volume of the digital image data is determined. A second set of features may then be extracted from the likelihood measure.

Abstract: A method, including receiving a data source selection from a user or software application, the data source including medical information of a plurality of patients, receiving, from the user or software application, a data pattern that is related to a concept to be explored in the data source, querying the data source to find information that approximately matches the data pattern; and receiving the information from the data source, wherein the information includes unstructured data, assigning a classification to individual parts of the information based on the part's relationship to the data pattern, and outputting the classified information to the user or software application.

Abstract: A claim pre-processing system employs trial adjudication to improve claim accuracy prior to claim submission to a healthcare payer institution or other entity. A system processes claim data related to provision of healthcare to a patient The system includes a claim data collator for collating data related to a claim for a particular patient for submission to a payer and a source of rules for use in processing collated claim data. A pre-processor submits the collated claim data for processing using the rules to validate the collated claim data is in condition for processing to initiate generation of payment. A claim processor submits the collated claim data to a payer, in response to successful validation by the pre-processor. A rules processor processes acquired claim data to identify a condition triggering application of a different set of rules for determining validity of an individual claim element.

Abstract: A photo detector matrix may have a plurality of photo detectors arranged in a matrix each generating an output signal, and a plurality of wires coupled with the photo detectors, wherein a number of wires is less than a number of photo detectors and the plurality of photo detectors are assigned to the plurality of wires such that signals generated by the plurality of photo detectors encode a location of a light peak applied to the photo detector matrix.

Abstract: A system and method for segmenting chambers of a heart in three dimensional images is disclosed. A set of three dimensional images of a heart is received. The shape of the heart in the three dimensional images is localized. Boundaries of the chambers of the heart in the localized shape are identified using steerable features.

Abstract: A technique is provided for automatically generating performance measurement information. At least some of the obtained performance measurement information may be derived from unstructured data sources, such as free text physician notes, medical images, and waveforms. The performance measurement may be sent to a health care accreditation organization. The health care accreditation organization can use the performance measurement to evaluate a health care provider for its quality of patient care. Alternatively, performance measurement information can be provided directly to consumers.

Abstract: A method for reconstructing an image generated from radial trajectory data in frequency or k-space using a GPU. The method includes using a vertex shader of the GPU to transform coordinates of a window aligned with the radial trajectory data and using a pixel shader of the GPU to combine data along the radial trajectory with the coordinate transformed widow to distribute the data along the radial trajectory fed to the pixel shader into cells of a Cartesian coordinate system.

Abstract: Beamforming for N elements in performed in log(N) steps of complexity O(N). The signals measured at each element are treated as a receive beam formed by that element with a beam width equal to the element pattern or the width of the transmit illumination. In each of multiple stages, the number of elements is halved by effectively doubling the pitch. The number of beams formed by each element is doubled by narrowing the beam width by a factor of 2 in sin(?). Since steering and focusing are separated, a single set of delays are applied to each element signal individually prior to the multi-stage beam forming for each finite depth. The data is in a sector format, but by using two beamforming steps, data in a Vector® format is provided.

Abstract: A method, including receiving multi-labeler data that includes data points labeled by a plurality of labelers; building a model from the multi-labeler data, wherein the model includes an input variable that corresponds to the data points, a label variable that corresponds to true labels for the data points, and variables for the labels given by the labelers; and executing the model, in response to receiving new data points, to determine a level of expertise of the labelers for the new data points.