Zhejiang University

Dingtalk Holding (cayman) Limited

Alipay (hangzhou) Information Technology Co., Ltd.

Alibaba Group Holding Limited

Alipay Information Technology Co., Ltd.

Yi Zhang

Dan Wu

Hongxi Zhang

Yuan Zhang

Lili Zhang

Hang Chen

Zhenhao Wu

Qing Ren

Feng Bao

Chenlu Guo

Liying Yu

Qi Dong

Junshao Zhang

Jiarui Shi

Jie Du

Ruibin Liu

Kaikai Yu

Jianxu Zheng

Kai Zhu

Tingting Liu

Haotian Li

Xingwang Yong

Jairui Shi

A CEST data fitting method and apparatus based on an extrapolated semisolid magnetization transfer reference signal, and a medium, which belong to the field of magnetic resonance imaging. According to the CEST data fitting method based on an extrapolated semisolid magnetization transfer reference signal, a lineshape of an MT effect is fused into a Bloch-McConnell equation, the MT effect can be obtained by means of fitting a model that is represented by the equation, and an interference effect can be eliminated by calculating the difference between a curve that is obtained via fitting and a curve that is collected from an experiment. The Bloch-McConnell-based fitting method can take into consideration a radio frequency pulse waveform that is actually used in an experiment, and can also be used when a system is not in steady state.

CEST data fitting method and apparatus based on extrapolated semisolid magnetization transfer reference signal, and medium

A method for 3D oscillating-gradient prepared gradient spin-echo imaging and a device. The imaging method comprises the following steps: first, using a global saturation module to destroy previous residual transverse magnetization; second, embedding a pair of trapezoidal cosine oscillating gradients into a 90°-180°-90°radiofrequency pulse by a diffusion encoding module, to separate diffusion encoding from signal acquisition; then, using a fat saturation module to suppress a fat signal; finally, acquiring a signal by means of gradient spin-echo readout, and correcting phase errors among multiple excitations by multiplexed sensitivity-encoding reconstruction. Compared with a 2D plane echo-based oscillating gradient diffusion sequence used on a 3T clinical system, a 3D oscillating-gradient prepared gradient spin-echo sequence effectively reduces the imaging time, improves the signal to noise ratio, and is beneficial to clinical transformation of time-dependent diffusion MRI technology.

3D oscillating gradient-prepared gradient spin-echo imaging method, and device

Sleeve storage rack

Non-elastic hammer

Disclosed is a method and apparatus for frequency drift correction of magnetic resonance CEST imaging, and a medium and an imaging device. The method comprises the following steps: firstly, in the frequency drift correction module, exciting a target slice by using a small flip-angle radio-frequency pulse, and acquiring a single line of free induction decay signals or two lines of non-phase encoding gradient echo signals; secondly, respectively calculating a value of the main magnetic field frequency drift according to phase information and an acquisition time of the single line of free induction decay signals or the two lines of non-phase encoding gradient echo signals; then adjusting the center frequency of the magnetic resonance device in real time according to the calculated value of the main magnetic field frequency drift, and achieving the real-time correction of main magnetic field frequency drift; and finally, performing CEST imaging.

Method and apparatus for frequency drift correction of magnetic resonance CEST imaging, and medium and imaging device

The present disclosure provides a method for optimizing T1-weighted magnetic resonance imaging of infant brains. Firstly, T1 and PD maps of infant brains at 0-12 months old are collected to obtain average T1 and PD values of WM and GM of the infant brains, and infants are classified into three age groups according to the characteristics of WM and GM T1 values of the infant brains. Then, the theoretical signal strength of the WM and GM of the infant brains generated from a 3D T1-weighted imaging sequence is calculated through Bloch simulation, and a theoretical optimal TI scheme of each group is determined according to the simulated WM/GM contrast characteristics under different TIs. Finally, the theoretical optimal TI scheme is applied to a target infant brain according to the designated age group for 3D T1-weighted magnetic resonance imaging.

Method for optimizing T1-weighted magnetic resonance imaging of infant brain

Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for testing performance of a biometric characteristic recognition device. One of the methods includes obtaining a target simulated component for testing performance of the biometric characteristic recognition device from a plurality of simulated components. A mechanical arm is controlled, based on a camera component arranged on the mechanical arm, to input biometric characteristic information of the target simulated component to the biometric characteristic recognition device. A recognition result is obtained from the biometric characteristic recognition device and a performance test result of the biometric characteristic recognition device is determined based on the recognition result.

Methods, apparatuses, devices, and systems for testing biometric recognition device

A magnetic resonance CEST imaging sequence and device based on a frequency stabilization module are provided. It includes following steps: first, in the frequency stabilization module, exciting a target slice with a small-flip-angle radio frequency pulse, and collecting three lines of non-phase-encoded k-space data; second, obtaining an estimated value of the frequency drift of the main magnetic field by calculating the phase difference between the three lines of non-phase encoded k-space data; third, adjusting a center frequency of the radio frequency pulse based on the calculation result of the frequency drift of the main magnetic field, to realize a real-time correction of the frequency drift of the main magnetic field; and fourth, performing conventional magnetic resonance CEST imaging.

Magnetic resonance cest imaging sequence and device based on frequency stabilization module

A client device displays a user interface, which includes a menu item associated with forced reminders. In response to a user selecting the menu item, the client device displays a forced-reminder user interface, which includes a content display area configured to display one or more forced-reminder messages.

Communication and messaging system

Growing community of inventors

Hangzhou, China

Yi Zhang