Hangzhou Virtual and Reality Technology Co., Ltd.

Zhejiang University

Zhejiang Johar Technology Co., Ltd.

Zhejiang Fanju Technology Co., Ltd.

No. 128 Hospital of Hangzhou

Hang Zhou Yike Technology Ltd.

Leadway (hk) Limited

Bo Wang

Huafeng Liu

Jian Ming Liu

Limin Qiu

Zhihua Gan

Yi Luo

Jian Hao

Fan Zhang

Maosheng Dong

Sheng Wu

Yongfei Zhao

Longyi Wang

Bingyan Fan

Hongfeng Zhu

Qibin Zhu

Jun Yi

The present invention discloses a PET system attenuation correction method based on a flow model. The flow model adopted is a completely reversible model, the forward and reverse mappings share the same parameters, and the structure itself is a consistency constraint. The model utilizes the spatial correlation of adjacent slices, and adopts the structure of multi-slice input and single-slice output. The model consists of multiple reversible blocks, each of which consists of a enhanced affine coupling layer and a reversible 1×1 convolutional layer, and uses several small u-nets to learn the transformation parameters of the enhanced affine coupling layer. The present invention avoids additional CT or MR scanning, saves scanning cost for the patient, and reduces the damage of CT radiation to the patient; compared with similar methods, higher quality non-attenuation-corrected PET image can be obtained.

Pet system attenuation correction method based on a flow model

A device for visual walking includes an omnidirectional exercise machine and foot wearable devices. A method for visual walking is applied to the device for visual walking. When a user wears the omnidirectional exercise machine and uses the loading frame to adjust a height of the omnidirectional exercise machine, and wears the foot wearable devices to stand and run on a running plate, human body posture data is obtained by tracking a human body torso. Then displacement data of left and right feet is obtained by tracking the feet. A virtual position and a movement speed of the feet are respectively obtained according to the displacement data, the leg posture is inferred by the IK algorithm according to the virtual position and the walking action of the virtual character is controlled according to the human body posture data, the movement speed of the feet, and the leg posture.

Device and method for virtual walking

This invention discloses a chip wiring layer temperature sensing circuit, a temperature sensing method, a chip stereo temperature sensor, and a chip thereof. The chip wiring layer temperature sensing circuit includes a metal wiring layer temperature detection module, a pulse delay detection module, and a temperature transition module; wherein the metal wiring layer temperature detection module is disposed at a metal interconnection structure of a metal wiring layer of a chip; and the metal interconnection structure is electrically connected to the pulse delay detection module; wherein the pulse delay detection module includes a system high-speed clock, a delay data generated after a pulse passing through the metal wiring layer temperature detection module detected by the system high-speed clock, and the delay data was sent to the temperature transition module; wherein the temperature transition module calculates a temperature of the metal wiring layer according to the delay data.

Chip wiring layer temperature sensing circuit, temperature sensing method and chip thereof

VR shoe sleeve

A PET image reconstruction method, including: 1) injecting a PET radioactive tracer into a biological tissue, scanning by a PET device, and detecting and counting coincidence photons to obtain an original protection data matrix; 2) establishing a measurement equation model; 3) splitting the reconstruction problem into a first sub-problem and a second sub-problem; 4) solving the first sub-problem by a filtered back-projection layer, solving the second sub-problem by an improved denoising convolutional neural network, where the filtered back-projection layer and the improved denoising convolutional neural network are connected in series to form a filtered back-projection network (FBP-Net); 5) inputting original projection data into the FBP-Net, and using an image as a tag to adjust parameters of the FBP-Net to reduce an error between an output of the FBP-Net and the tag; and 6) inputting projection data to be reconstructed into the trained FBP-Net to obtain a desired reconstructed image.

Positron emission tomography image reconstruction method

Omnidirectional walking simulator

Virtual reality motion controller kit

The disclosure relates to a Virtual Reality (VR) omnidirectional body motion input platform. The VR omnidirectional body motion input platform includes a universal treadmill. An upright post is provided on a side of the universal treadmill; a cantilever located above the universal treadmill is provided on the upright post; a suspension frame extending downward is connected to the cantilever; and a body restriction mechanism located above the universal treadmill is connected to a lower end of the suspension frame.

Virtual reality human body omni-directional movement input platform

Omnidirectional motion simulator

Virtual reality treadmill

The present invention discloses a sittable universal motion platform including a chassis, a support arm and a waist ring, the support arm is rotationally connected with the chassis and provided with an adjusting support; the adjusting support includes a slide carriage and a slide block, the slide block is slidingly connected with the slide carriage and is fixed on the support arm, the slide carriage is connected with the waist ring; and a positioning device is arranged on the adjusting support. The slide carriage is provided with slide rail and the slide block is provided with a corresponding matched chute, the number of slide rails can be two, and the number of corresponding chutes is also two, so that the slide carriage and the slide block can slide at will and can be more stable.

Sittable universal motion platform

Virtual reality human omnidirectional mobile input platform

The present invention relates to a motion determination limiting device including a housing. An extendable rod is arranged throughout the housing. A vertical position limiting mechanism and a horizontal position limiting mechanism are sleeved outside the extendable rod in a down-to-top manner. The housing is sleeved outside the vertical position limiting mechanism and the horizontal position limiting mechanism. A lower portion of the vertical position limiting mechanism is provided with a position limiting bearing. When the user is walking, an inclination is generated to drive the vertical position limiting mechanism in the present invention to stop the extendable rod from moving upwardly and downwardly, such that the position limitation in the vertical direction can be realized. Moreover, the rotation in horizontal direction is allowed, and the swings of the user can be limited via the horizontal position limiting mechanism.

Motion determination limiting device

This invention discloses a method for utilizing soft X-ray microimaging for cancer cell image recognition. The method comprises the steps of 1) sample preparation; 2) pathological examination; 3) soft X-ray imaging; and 4) analysis and recognition. This invention applies soft X-ray microimaging for cancer cell image recognition, successfully obtains the soft X-ray microscopic image of a cancer cell by scanning the cancer cell with synchrotron radiation soft X-ray microimaging, provides recognition steps and experimental data, and establishes a method for utilizing soft X-ray microimaging for cancer cell image recognition. This invention creates a method for analyzing soft X-ray microscopic images, provides a novel synchrotron radiation soft X-ray pathological diagnosis method for cancer diagnosis, and provides an extremely valuable basis for the creation and clinical application of soft X-ray pathology in the 21century.

Method for utilizing soft X-ray microimaging for cancer cell image recognition

A pulse tube cryocooler modulating phase via an inertance tube and an acoustic amplifier (A, A) provided in the pulse tube cryocooler are disclosed. The acoustic power amplifier (A, A) is made of a metal pulse tube (PT, PT) filled with regenerative materials, which are located at a distance of X from the hot end of the pulse tube. The length of the regenerative materials is L which meets the requirement of X&#x2212;L&#x3e;0. The acoustic power amplifier (A, A) can be used not only in a single-stage pulse tube cryocooler, but also in a multi-stage pulse tube cryocooler thermally coupled or gas coupled. The regenerative materials may be any cold storage materials applicable at low temperatures, such as stainless steel wire mesh, lead pellet, lead thread et al. The acoustic power amplifier (A, A) can increase the acoustic power at the hot end of the pulse tube (PT, PT), which is advantageous to the phase modulation of the inertance tube, thereby the properties of the pulse tube cryocooler can be enhanced.

Pulse tube cryocooler modulating phase via inertance tube and acoustic power amplifier thereof

Growing community of inventors

Hangzhou, China

Bo Wang