Analogic Corporation

Aleksander Roshi

Ram Naidu

David Rozas

Sergey Simanovsky

Charles H Shaughnessy

Julia Pavlovich

Matthew B Christensen

Zhengrong Ying

Enrico Dolazza

Anton M Deykoon

David A Schafer

Andrew Litvin

Basak Ulker Karbeyaz

Louis Poulo

Charles Shaughnessy

Among other things, one or more systems and/or techniques are described for shaping a profile of radiation attenuation in a fan-angle direction via a pre-object filter (e.g., a bowtie filter) based upon a profile of an object. For example, a pre-object filter may be at least partially rotated about a filter axis and/or may be translated in a direction parallel to a direction of conveyance of the object under examination to adjust a profile of radiation attenuation in the fan-angle direction. Further, in one embodiment, the profile of radiation attenuation may be reshaped during rotation of the radiation source about the object to adjust an amount of radiation attenuation in the fan-angle direction (e.g., to adjust a profile of radiation attenuation as a shape of the object changes from a perspective of a radiation source as the radiation source is rotated about the object).

Pre-object filter for shaping profile of radiation attenuation in fan-angle direction

Among other things, one or more techniques and/or systems for calibration of a radiation system to compute a gain correction(s) are provided. A calibration procedure is performed during which a portion of the detector array is shadowed by an object, causing the detector array to be non-uniformly exposed to radiation. A portion of a projection generated from the calibration procedure and indicative of radiation that did not traverse the object is separated from a portion of the projection indicative of radiation that did traverse the object, and a gain correction(s) is computed from the portion of the projection indicative of radiation that did not traverse the object (e.g., and is thus indicative of radiation that merely traversed air).

Gain calibration and correction in radiation system

Pre-object filter for shaping profile of radiation attentuation in fan-angle direction

A method and system are provided for generating high resolution CT images. The NSR# method improves on the AMPR method, by increasing the in-plane image resolution of CT scanners, in the helical scanning mode. The provided method uses the quarter detector offset and interleaving of complementary data to achieve in plane image resolution that is similar to the high resolution axial scanning mode utilizing quarter detector offset and interleaving. The method includes several ways of choosing the data to be interleaved, like NSR# with two planes, NSR# with 3 planes, NSR# with multiple planes. The interleaved data are used to create high resolution tilted slices. The NSR# method optimizes the untilting filter to create a mix of high and low resolution tilted slices to achieve the desired in-plane image resolution-image artifact balance required for the imaging task. In one embodiment in the untilting process one may use only high resolution tilted slices, for maximum resolution benefit. In another embodiment one may mix high resolution tilted slices with standard resolution tilted slices resulting from data that did not go through interleaving. This creates unfilled slices of higher resolution than the standard and with lower artifacts. In another embodiment for scans with pitch lower than &#x2154; one may reduce the collimation to reduce the dose to the patient.

Method and system for high resolution nutated slice reconstruction using quarter detector offset

A source of X-rays including at least two cathodes and at least one common anode configured and arranged so as to generate at least two spaced apart beams of X-rays emanating from respectively different locations of the anode, and separately controlled so as to be generated independently of one another. The staggered focal spots can be generated simultaneously or alternately as required. An X-ray imaging system comprising such an X-rays source, and a method utilizing such a source are also disclosed.

Multi-cathode X-ray tubes with staggered focal spots, and systems and methods using same

The techniques described herein provide for correcting projection data that comprises contamination due to source switching in a multi energy scanner. The correction is a multi-neighbor correction. That is, it uses data from at least two other views of an object (e.g., generally a previous view and a subsequent view) to correct a current view of the object. The multi-neighbor correction may use one or more correction factors to determine how much data from the other two views to use to correct the current view. The correction factor(s) are determined based upon a calibration that utilizes image space data and/or projection space data of a phantom. In this way, the correction factor(s) account for source leakage that occurs in multi energy scanners.

Correction for source switching in multi energy scanner

The disclosed CT scanner comprises at least one source of X-rays; a detector array comprising a plurality of detectors; and an X-ray filter mask arrangement disposed between the source of X-rays and detector array so as to modify the spectra of the X-rays transmitted from the source through the mask to at least some of the detectors so that the X-ray spectra detected by at least one set of detectors is different from the X-ray spectra detected by at least one other set of detectors.

Growing community of inventors

Medford, MA, United States of America

Aleksander Roshi