A method of estimating artifacts in 3D imaging by providing a 3D mask representing an object. X-rays of an X-ray source-detector pair are simulated through the object in a plurality of projection positions of the X-ray source-detector pair moving along a pregiven trajectory. An artifact value is assigned to each voxel of a 3D artifact image depending on respective path lengths of the X-rays through the 3D mask. Visualizing a respective artifact map for a current C-arm tilt enables an interactive optimization of a C-arm tilt.

A reconstructed volume of a region of patient anatomy is processed to reduce motion artifacts in the reconstructed volume. Autosegmentation of high-contrast structures present in an initial reconstructed volume is performed to generate a 3D representation of the high-contrast structures. 2D mask projections are generated by performing forward projection on the 3D representation, where each 2D mask projection includes location information indicating pixels that correspond to the high-contrast structures during the forward projection process. The acquired 2D projections are modified via in-painting to generate corrected 2D projections, where the acquired 2D projections are modified using information from the 2D mask projections. For example, pixels in the acquired 2D projections that are associated with high-contrast moving structures are replaced with low-contrast pixels. These corrected 2D projections are used to produce an improved reconstructed volume with fewer and/or less visually prominent motion artifacts.

An apparatus includes a memory to store first volumetric image data representing a first volumetric image of an anatomical region having a volume of interest (VOI). The first volumetric image includes several first voxels at first locations in the first volumetric image. The first volumetric image data includes first uncertainty values corresponding to the several first voxels. The first uncertainty values represent probabilities that the corresponding plurality of first voxels are part of the VOI. The memory is to store second volumetric image data representing a second volumetric image of the anatomical region. The apparatus includes a processing device operatively coupled to the memory. The processing device is to determine a deformation field to map the several first voxels to second locations in the second volumetric image. The deformation field is based in part on the first uncertainty values.

Metal artifact correction including projecting x-rays to scan a volumetric region of an object, the projecting generates corresponding cone beam computed tomography (CBCT) image data, reconstructing an enlarged CBCT volume from the CBCT image data, the enlarged CBCT volume representative of the volumetric region and a volume outside the volumetric region, generating from the enlarged CBCT volume and a projection geometry, maximum intensity projections on a virtual plane, detecting attenuated image areas in the maximum intensity projections corresponding to metal, corresponding the detected attenuated image areas corresponding to the metal to areas of the CBCT image data, and reconstructing a final CBCT volume using the CBCT image data by suppression of the areas of the CBCT image data corresponding to the detected attenuated image areas of the maximum intensity projections. Systems for metal artifact correction are also disclosed.

Systems and methods for training a machine-learning model for artifact reduction are provided. Such methods include retrieving a three-dimensional digital phantom reconstructed from CT imaging data. The method then selects a first Z position along the central axis and simulates a first set of forward projections from the digital phantom taken along an axial trajectory at the first Z position along the central axis. The first set of forward projections has a first simulated collimation in the axial direction. The method then reconstructs a first simulated image from the first set of forward projections and identifies a plurality of secondary Z positions along the central axis other than the first Z position. For each of the secondary Z positions and the first Z position itself, the method then simulates a set of secondary forward projections from the digital phantom taken along corresponding axial trajectories at the corresponding secondary Z position.

Described is a system and/or method for displaying the location of a ferromagnetic object in a living organism by using a surgical probe. The surgical probe has a shaft with three-dimensional magnetoresistance sensors located on a distal end configured for insertion into the living organism and three-dimensional magnetoresistance sensors located on a proximal end that stays outside of the living organism. The system comprises a display configured to show the relative location of a detected ferromagnetic object to the tip of the probe in a simulated three-dimensional view on a two-dimensional display.

A medical image processing apparatus and a medical image processing method that can reduce the noise bias of a corrected image in which high absorber artifacts included in a reconstructed image are corrected. The medical image processing apparatus has an arithmetic unit for correcting high absorber artifacts. The arithmetic unit comprises: a projection data generating section that generates projection data corresponding to a high absorber area in a reconstructed image with high absorber artifacts; a noise image generating section that generates a noise image using the projection data; and a weighted combining section that makes a weighted combining of the noise image with a corrected image in which high absorber artifacts are corrected.

An information processing system is provided, including circuitry configured to: acquire projection data representing an X-ray CT projection image related to an object to be measured and an absorption model related to a mode of absorption of X-rays by the object, the projection data including information on the projection image(s) corresponding to azimuths where incident X-rays are applied to the object; generate corrected projection data for each candidate of hypothetical incident X-rays, the corrected projection data being the projection data in which correction on the basis of the candidate of hypothetical incident X-rays and the absorption model is performed; calculate a consistency index indicating a degree of consistency of the corrected projection images corresponding to the azimuths for each of the corrected projection data generated; and an output unit configured to output, on the basis of the consistency index, at least one piece of the corrected projection data generated.

An information processing apparatus includes a processor, in which the processor acquires first projection data output from a detector that has detected radiation of a first energy transmitted through a subject and second projection data output from the detector that has detected radiation of a second energy transmitted through the subject, the second energy being different from the first energy, and performs a correction process of correcting artifacts in a region in which an amount of change between the first projection data and the second projection data is equal to or greater than a threshold value.

A processor is provided, and the processor specifies a high-attenuation substance region in a projection image acquired by imaging a subject including a high-attenuation substance using a CT apparatus, and derives a corrected projection image by performing correction on the high-attenuation substance region in the projection image to suppress a difference in image quality between the high-attenuation substance region and other regions outside the high-attenuation substance region.