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公开(公告)号：US11354834B2
公开(公告)日：2022-06-07
申请号：US16957372
申请日：2018-12-24
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Shekhar Dwivedi , Chuanyong Bai , Andriy Andreyev , Bin Zhang , Zhiqiang Hu
Abstract: A non-transitory computer-readable medium stores instructions readable and executable by at least one electronic processor (20) to perform an image reconstruction method (100). The method includes: performing iterative image reconstruction of imaging data acquired using an image acquisition device (12); selecting an update image from a plurality of update images produced by the iterative image reconstruction; processing the selected update image to generate a hot spot artifact map; and suppressing hot spots identified by the generated hot spot artifact map in a reconstructed image output by the iterative image reconstruction.
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22.发明授权公开(公告)号：US11210820B2
公开(公告)日：2021-12-28
申请号：US16336562
申请日：2017-09-25
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Andriy Andreyev , Chuanyong Bai , Bin Zhang , Faguo Yang , Shekhar Dwivedi , Zhiqiang Hu
Abstract: Iterative reconstruction (20) of imaging data is performed to generate a sequence of update images (22) terminating at a reconstructed image. During the iterative reconstruction, at least one of an update image and a parameter of the iterative reconstruction is adjusted using an adjustment process separate from the iterative reconstruction. In some embodiments using an edge-preserving regularization prior (26), the adjustment process (30) adjusts an edge preservation threshold to reduce gradient steepness above which edge preservation applies for later iterations compared with earlier iterations. In some embodiments, the adjustment process includes determining (36, 38) for each pixel, voxel, or region of a current update image whether its evolution prior to the current update image 22) satisfies an artifact feature criterion. A local noise suppression operation (40) is performed on the pixel, voxel, or region if the evolution satisfies the artifact feature criterion and is not performed otherwise.
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公开(公告)号：US11200711B2
公开(公告)日：2021-12-14
申请号：US15770783
申请日：2016-11-16
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Bin Zhang , Zhiqiang Hu
Abstract: The following relates to noise filtering in nuclear imaging systems. In one aspect, a fully automatic noise filtering system is provided in a nuclear imaging device. In some embodiments, a filter parameter selection engine is applied to an image environment of a medical image to calculate an image filter configuration for the medical image wherein the image environment includes values for one or more of an imaging subject of the medical image, an imaging device used to acquire the medical image, and a medical context of the medical image.
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公开(公告)号：US10799200B2
公开(公告)日：2020-10-13
申请号：US14909747
申请日：2014-08-07
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： Bin Zhang , Chi-Hua Tung
Abstract: A nuclear scanner includes an annular support structure (12) which supports a plurality of radiation detector units (14), each detector unit including crystals (52), tiles (66) containing an array of crystals, or modules (14) of tiles. The detector units define annular ranks of crystals, and the annular ranks of crystals define spaces between the ranks. In another embodiment, the crystals define axial spaces between crystals. Separate rings of crystals have axial spaces that are staggered such that no area of the imaging region is missed. The spaces between the detector units may be adjusted to form uniform or non-uniform spacing. Moving the patient through the annular support structure compensates for reduced sampling under the spaces between ranks.
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