Johns Hopkins University

Medtronic Navigation, Inc.

Carestream Health, Inc.

Wojciech Zbijewski

Jeffrey H Siewerdsen

Patrick A Helm

Ali Uneri

Xiaoxuan Zhang

Joseph W Stayman, Iv

John Yorkston

Joseph Webster Stayman

Alejandro Sisniega

J Webster Stayman

Selected artifacts, which may be based on distortions or selected attenuation features, may be reduced or removed from a reconstructed image. Various artifacts may occur due to the presence of a metal object in a field of view. The metal object may be identified and removed from a data that is used to generate a reconstruction.

System and method for artifact reduction in an image

The present invention is directed to a method of multi-motion compensation for high-quality cone-beam CT of the head. A multi-stage approach is incorporated that includes a pre-conditioning stage in which an initial estimation of the motion trajectory is obtained with 3D-2D registration using the motion-contaminated CBCT and projection data. In the present invention, the motion-contaminated CBCT is used as a basis for 3D-2D registration in the pre-conditioning stage to capture large amplitude, rapid movements of the head and provide better initialization of the autofocus solution.

Multi-motion compensation for high-quality cone-beam CT of the head

The present invention is directed to a system and method for dual-energy (DE) or multiple-energy (spectral) cone-beam computed tomography (CBCT) using a configuration of multiple x-ray sources and a single detector. The x-ray sources are operated to produce x-ray spectra of different energies (peak kilovoltage (kVp) and/or filtration). Volumetric 3D image reconstruction and dual or triple energy 3D image decomposition can be executed using data from the CBCT scan. The invention allows for a variety of selections in energy and filtration associated with each source and the order of pulsing for each source ('firing pattern'). The motivation for distributing the sources along the z direction in CBCT includes extension of the longitudinal field of view and reduction of cone-beam artifacts.

Dual-energy cone-beam computed tomography with a multiple source, single-detector configuration

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Baltimore, MD, United States of America

Wojciech Zbijewski