Shenyang Neusoft Medical Systems Co., Ltd.

Beijing Neusoft Medical Equipment Co., Ltd.

Liang Ren

Shanshan Lou

Ling Pang

Shuangxue Li

A method and a device for processing metal artifacts in a CT image are provided. In an example, the method includes: a first image is obtained before a metal probe is intervened; second raw data and a second image corresponding to the second raw data are obtained after the metal probe is intervened; a third image of a metal region in the second image is obtained; channels corresponding to the metal region are determined; CT values of the metal region in the second image are set to a preset value to obtain a model image and model raw data corresponding to the model image; data at the channels in the second raw data is replaced with data at the channels in the model raw data to obtain a replaced second raw data; and based on the replaced second raw data and the third image, a target image is obtained.

Processing metal artifacts in CT image

The present disclosure provides a sampling method and sampling apparatus of a scanning device. In at least one example, the sampling method comprises acquiring a ray attenuation variation at each of a plurality of scanning angles of the scanning device, determining a corrected sampling interval at each of the scanning angles of the scanning device by adjusting an initial sampling interval at each of the scanning angles of the scanning device according to the ray attenuation variation at each of scanning angles, and performing actual sampling according to the corrected sampling interval at each of the scanning angles of the scanning device.

Sampling of scanning device

Methods, devices, and apparatus, including computer programs encoded on a computer storage medium for reconstructing an image are provided. An example method includes: acquiring Computed Tomography (CT) projection data of a subject, determining an image cutoff frequency Faccording to a CT image matrix size for reconstructing a CT image and an imaging field of view size, obtaining a convolution kernel and a cutoff frequency Fof the convolution kernel, using the convolution kernel as a reconstruction convolution kernel when F&#x3c;F; adjusting Fto a product of a preset value k and Fand truncating the convolution kernel to obtain a portion of the convolution kernel having a cutoff frequency no more than the adjusted Fas the reconstruction convolution kernel when F&#x2265;F, and reconstruct the CT image with the CT projection data and the reconstruction convolution kernel by using a convolution back-projection algorithm.

Reconstructing image

A method for modulating x-ray radiation dose in CT scan is disclosed. The method may include: acquiring x-ray attenuation information of each Z position within a planned scanning sequence for a scan region of a subject from data of a finished scanning sequence for the subject; and then, based on the acquired x-ray attenuation information, performing dose modulation with respect to the XY scanning profile at each Z position within the planned scanning sequence. The finished scanning sequence can be an axial and/or helical scanning sequence for a scan region wholly or partially same as the scan region and has been performed earlier. The Z position may include a position in Z direction extending from head to foot of the subject or conversely. The XY scanning profile may include a scanning profile of the subject which is vertical to Z direction.

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Shenyang, China

Liang Ren