Siemens Healthcare Gmbh

Shenzhen Camsense Technologies Co., Ltd

Siemens Aktiengesellschaft

Shenzhen Taishan Online Technology Co., Ltd

Siemens Healthineers Ag

Zte Corporation

The General Hospital Corporation

Kun Zhou

Yan Zhang

De He Weng

Danwei Shi

Mario Zeller

Dominik Paul

Le Zhang

Fang Dong

Le Li

Nan Xiao

David Grodzki

Stephan Biber

Di Wu

Yu Wang

Qiong Zhang

Jonathan R Polimeni

Uvo Hölscher

Lei Yuan

William Scott Hoge

Jun Cheng

Wenchuang Zhao

Zeming Lin

Shunzhi Lv

Guangxi Zeng

Yulin Chang

Shi Cheng

Chenxi Wei

In a magnetic resonance imaging method, a first adjustment parameter is determined for presetting an initial contrast of a magnetic resonance image; a second adjustment parameter is determined for obtaining an optimized contrast of the magnetic resonance image and a specified data acquisition time of a blade artifact correction sequence; an optimized echo signal evolution curve is determined according to the first adjustment parameter and the second adjustment parameter; an actual variable flip angle train is calculated according to the optimized echo signal evolution curve; and the actual variable flip angle train is applied to a two-dimensional fast spin echo sequence, and the blade artifact correction sequence corresponding to the second adjustment parameter is used to acquire magnetic resonance signals and enable the magnetic resonance image to satisfy the optimized contrast.

Magnetic resonance imaging method and apparatus based on two-dimensional fast spin echo

The present disclosure provides a distance measuring device and a sweeping robot. The distance measuring device includes a base, a baffle, a drive assembly, a ranging component, and a driving component. The baffle is arranged over the base, and may prevent foreign matters over the baffle from intruding into the drive assembly. The baffle may be a portion extended upwards from the base, or may be arranged over the base in a mounting manner. The drive assembly may transmit power of the driving component to the ranging component. The driving component and the ranging component are mounted on the base. The baffle is arranged over the base, and defines a closed or a semi-closed mounting chamber with the base to block foreign matters from intruding into the drive assembly.

Distance measuring device and sweeping robot

The present disclosure provides a distance measuring device and a sweeping robot. The distance measuring device includes: a base, including a base plate and a side wall extending from the base plate; a baffle, arranged opposite to the base plate and covering part of the base plate; a first drive wheel and a second drive wheel, both rotatably mounted on the base; a connecting component; and a driving device. The side wall at least partially encloses an outer periphery of the first drive wheel, the baffle is attached to a part of the side wall enclosing the outer periphery of the first drive wheel, and the base plate, the baffle, and the side wall collaboratively enclose the first drive wheel, the second drive wheel, the base plate, the baffle and the side wall collaboratively define a mounting chamber, wherein the first drive wheel is received in the mounting chamber.

A method for actuating a magnetic resonance device according to an MR control sequence, wherein the MR control sequence includes a bipolar gradient pulse between an excitation pulse and a first refocusing pulse, and the bipolar gradient pulse induces a defined Maxwell phase and generates a dephasing gradient moment for a readout gradient.

Actuating a magnetic resonance device with compensated Maxwell phase

Techniques are disclosed for use in magnetic resonance imaging (MRI) for exciting spins of a first material and spins of a second material. A first spin echo signal is acquired when the excited spins include a first phase difference, which is given by Δ, and a second spin echo signal is acquired when the excited spins of the first material and the excited spins of the second material include a second phase difference, which is given by −Δ. An absolute value of Δ lies within the interval ]0,π[. A first image for the first material and/or a second image for the second material is generated by a computing unit depending on the first spin echo signal and the second spin echo signal.

Magnetic resonance imaging of an object with a first and a second material

A method and apparatus for susceptibility-weighted imaging, and a magnetic resonance imaging system. The method includes, in planar echo imaging of a plurality of excitations, performing flow compensation in directions of layered encoding, phase encoding, and frequency encoding for echoes of each excitation; after determination of excitation each time, when a linear reordering mode is adopted, for excitation each time, collecting each echo towards space k in a positive direction or a negative direction from the central echo of the plurality of echoes, and collecting echoes of the current excitation in a direction opposite to a direction of collecting echoes of the previous excitation; and subjecting the collected echoes to susceptibility-weighted imaging. An aspect of the present disclosure allows a reduction of flow artifacts in an image created by susceptibility-weighted imaging based on a planar echo sequence.

3D flow compensated interleaved EPI with a centric reordering scheme for fast high-resolution susceptibility-weighted imaging

In a MR water-fat image separation method and device, within one echo period, a first echo set under a first readout gradient polarity and a second echo set under a second readout gradient polarity are acquired. The first and second readout gradient polarities may be opposite, and echoes in the first echo set may be positionally one-to-one symmetric to echoes in the second echo set with respect to the echo center of the echo period. A first echo image set is obtained based on first echo set data acquired in each echo period, and a second echo image set is obtained based on second echo set data acquired in each echo period. Using the first and second echo image sets, a Dixon water-fat separation calculation is performed to obtain a water image and a fat image. The method and device can advantageously increase acquisition efficiency and the signal-to-noise ratio.

Magnetic resonance water-fat image separation method and apparatus, imaging system and storage medium

A device for optical distance measurement includes a light emitter configured to emit light to a target object; a light receiver configured to receive reflected light obtained after the light is emitted to the target object, wherein the light receiver comprises a lens and an array image sensor containing a photosensitive area which is divided into one or more photosensitive sub-areas configured to collect one or more light spots of the reflected light; and the light receiver is further configured to generate a response signal comprising position information of the one or more light spots of the reflected light; and a processor configured to receive the response signal generated by the light receiver and calculate, according to the position information of the light spots of the reflected light, a distance from the target object to the device for optical distance measurement by triangulation method.

Method and device for optical distance measurement

The disclosure relates to a fast susceptibility imaging techniques for performing flow compensations in the slice, phase, and frequency encoding directions for the central echo of a plurality of echoes excited each time in interleaved echo planar imaging (iEPI). The echo data for which flow compensations have been performed may be collected, and susceptibility-weighted imaging (SWI) performed for collected echo data. The fast susceptibility imaging techniques may reduce scan time.

3D flow compensated interleaved epi in combination with swapped readout

The present disclosure discloses a magnetic resonance imaging method based on a blade sequence. The method can include acquiring 3-D data collected by a surface coil, determining a corresponding plurality of kernel data of each blade from the 3-D data according to the position information of each blade, collecting a corresponding plurality of slices of aliasing K-space data of each blade, performing convolution operations for the corresponding plurality of slices of aliasing K-space data of each blade and the corresponding plurality of kernel data of each blade to obtain a corresponding plurality of unaliasing K-space data of each blade, and reconstructing images for the corresponding plurality of unaliasing K-space data of different blades to obtain a plurality of unaliasing images. The present disclosure further describes a magnetic resonance imaging device for realizing the method and a computer-readable storage medium.

MRI method and device based on a blade sequence, and storage medium

Systems and methods include conversion of a first frame of k-space data acquired using a first initial readout polarity to first hybrid (k, y)-space data, conversion of a second frame of k-space data acquired using a second initial readout polarity to second hybrid (k, y)-space data, determination of a relationship between phase difference and y-position based on phase differences between a plurality of pixels located at k=a of first hybrid (k, y)-space data and a plurality of pixels at k=b of second hybrid (k, y)-space data, where a and b are constants, modification of the second hybrid (k, y)-space data based on the relationship, conversion of the modified second hybrid (k, y)-space data to a modified second frame of k-space data, generation of two single-polarity readout k-space frames based on the first frame of k-space data and the modified second frame of k-space data, and correction of a third frame of EPI image data based on the two single-readout polarity k-space frames.

Phase correction for echo-planar imaging

A method and a magnetic resonance imaging device, and a corresponding computer readable storage medium. The method includes acquiring a distortion function describing a frequency dependence of an amplitude or phase of an MR-signal received by a receiver part of the MRI-device, Fourier transforming K-space data acquired using this receiver part to image space data, generating compensated image space data by compensating for the frequency dependence by dividing the image space data or image space data derived therefrom in image space by the distortion function, and providing the MR-image as the compensated image space data or reconstructed therefrom.

Method and magnetic resonance imaging device for providing an MR-image, computer program, and computer-readable storage medium

In a magnetic resonance readout-segmented diffusion-weighted imaging method, apparatus, and storage medium, a non-linear phase RF excitation pulse is applied to nuclear spins that exhibit a magnetization intensity vector, and applying, in a slice selection direction, a slice selection gradient pulse of duration corresponding to the non-linear phase RF excitation pulse, so as to flip the magnetization intensity vector into the X-Y plane. Diffusion weighting is performed on the magnetization intensity vector flipped into the X-Y plane. A readout-segmented sampling sequence is executed to read out raw data in a segmented manner from the magnetization intensity vector resulting from diffusion weighting. A view angle tilting gradient pulse is applied in the slice selection direction.

Readout-segmented diffusion-weighted imaging method, apparatus, and storage medium

A method for extracting a center position of an infrared spot is disclosed. The method includes: acquiring, by an electronic device, an image, wherein the image includes an infrared spot; denoising, by the electronic device, the image; binarizing, by the electronic device, the denoised image; extracting, by the electronic device, a connected component of the infrared spot in the binarized image, wherein the connected component includes a plurality of pixel intensities and pixel positions of the infrared spot; and calculating, by the electronic device, the center position of the infrared spot based on the extracted connected component.

Method and electronic device for extracting a center position of an infrared spot

In a correction method and apparatus for a magnetic resonance diffusion weighted imaging image, a diffusion weighted imaging image is corrected based on a launch site correction factor and/or a receiving field correction factor. The launch site correction factor is used for correcting inhomogeneity of a launch site, and the receiving field correction factor is used for correcting inhomogeneity of a receiving field. The imaging sequence of the diffusion weighted imaging image is thereby improved and the corresponding image reconstruction of the diffusion weighted imaging image, and the homogeneity of the diffusion weighted imaging image also can be improved, without measuring the intensity of the launch site, which significantly reduces the correction workload and is easy to automate.

Growing community of inventors

Shenzhen, China

Kun Zhou