Tsinghua University

Ihi Corporation

Ge Precision Healthcare LLC

Mingyang Yang

Takahiro Bamba

Yun Zhi Lin

Hideaki Tamaki

Xinqian Zheng

Yangjun Zhang

Bingjie Zhao

Yan Sun

Xueli Wang

Yanran Xu

Jingyi Yang

Yuting Dou

Embodiments of the present application provide a tissue boundary determination apparatus and method. The tissue boundary determination method includes acquiring multiple slice images of multiple positions of a tissue to be examined, determining, with regard to at least one first selected slice image of the multiple slice images, a tissue boundary on the first selected slice image, and determining, according to the tissue boundary on the first selected slice image, tissue boundaries on a predetermined number of other slice images adjacent to the first selected slice image. Therefore, an accurate tissue (such as malignant tumor) boundary may be acquired efficiently so as to provide a reference basis for analysis on internal and external tissue of a tumor.

Tissue boundary determination apparatus and method

The present disclosure relates to an imaging system and method. Specifically, an imaging system comprises: a positioning image acquisition unit, configured to acquire a positioning image of a scanning object; a monitoring slice image acquisition unit, configured to determine a key point corresponding to the position of a target region of interest in the positioning image by using a neural network, and acquire a monitoring slice image of the scanning object at the position of the key point; and a target region-of-interest segmentation unit, configured to segment the monitoring slice image to obtain the target region of interest. The present disclosure can accurately acquire the position of the monitoring slice, and can accurately obtain the target region of interest through segmentation by a cascaded coarse segmentation and fine segmentation.

Imaging system and method

A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. An axial distance Sfrom an upstream end face of the suction ring grooveto an impeller full blade leading edgeor a width bof the suction ring grooveis represented as A&#xb7;sin(&#x3b1;+&#x3b8;)+Aand is distributed in a sinusoidal shape in a circumferential direction, an initial phase angle &#x3b8;is in a range of 0&#xb0;&#x2264;&#x3b8;&#x2264;360&#xb0;, and a circumferential angle &#x3b1; of the casinghas a definition range of &#x3b8;&#x2264;&#x3b1;&#x2264;&#x3b8;360&#xb0;. In the expression, A denotes amplitude of distribution of the axial distance Sor the width b, and Adenotes an average of the axial distance Sor the width b.

Centrifugal compressor having an asymmetric self-recirculating casing treatment

A centrifugal compressor has a casing. In the casingis formed a back-flow channelto return fluid from a downstream position of an impeller full blade leading edgeto an upstream position of the impeller full blade leading edge. The back-flow channelincludes a suction ring grooveand a back-flow ring groove. The suction ring groove opens at the downstream position on the inner faceof the casing, and extends in the circumferential direction. The back-flow ring groove opens at the upstream position on the inner face, and extends in the circumferential direction. Distribution in the circumferential direction of the axial-direction position of the suction ring grooveor a width of the suction ring grooveis asymmetric with reference to the rotation axis.

A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. An axial-direction position Sfrom an upstream end face of the suction ring groove to an impeller full blade leading edgeor a width bof the suction ring grooveis represented as A(&#x3b1;&#xb7;D&#x2212;&#x3b2;&#xb7;D)+Aand is distributed in a parabolic shape in a circumferential direction. An initial phase angle &#x3b8;is in a range of 0&#x2266;&#x3b8;&#x2266;2&#x3c0;. A circumferential angle &#x3b1; of the casing has a definition range of &#x3b8;&#x2266;&#x3b1;&#x2266;&#x3b8;&#x3c0;. In the expression, A denotes a parameter of the parabola in the axial-direction position Sor the width b, and Adenotes an extreme of the axial-direction position Sor the width bwhen corresponding circumferential angle &#x3b2; and the &#x3b1; are equal at an extreme point of distribution of the parabola.

A centrifugal compressor includes an asymmetric self-recirculating casing treatment that includes, on an inner face of a casing, a suction ring groove, a ring guide channeland a back-flow ring grooveto form a self-recirculating channel. A position or a width of the suction ring grooveis distributed in an arc shape in a circumferential direction, and the arc has a center angle &#x3b1; in a range of 0&#x3c;&#x3b1;&#x2266;30&#xb0;.

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Beijing, China

Mingyang Yang