62 results about "Front end electronics" patented technology

A combined PET/MRI scanner generally includes a magnet for producing a magnetic field suitable for magnetic resonance imaging, a radiofrequency (RF) coil disposed within the magnetic field produced by the magnet and a ring tomograph disposed within the magnetic field produced by the magnet. The ring tomograph includes a scintillator layer for outputting at least one photon in response to an annihilation event, a detection array coupled to the scintillator layer for detecting the at least one photon outputted by the scintillator layer and for outputting a detection signal in response to the detected photon and a front-end electronic array coupled to the detection array for receiving the detection signal, wherein the front-end array has a preamplifier and a shaper network for conditioning the detection signal.

Tomography by emission of positrons (pet) system dedicated to examinations of human body parts such as the breast, axilla, head, neck, liver, heart, lungs, prostate region and other body extremities which is composed of at least two detecting plates (detector heads) with dimensions that are optimized for the breast, axilla region, brain and prostrate region or other extremities; motorized mechanical means to allow the movement of the plates under manual or computer control, making it possible to collect data in several orientations as needed for tomographic image reconstruction; an electronics system composed by a front-end electronics system, located physically on the detector heads, and a trigger and data acquisition system located off-detector in an electronic crate; a data acquisition and control software; and an image reconstruction and analysis software that allows reconstructing, visualizing and analyzing the data produced during the examination.

A method and apparatus for determining and correcting the baseline of a continuously sampled signal for use in positron emission tomography. The method employs continuous signal sampling to determine the signal level at time t(0) so that an accurate determination of an integrated signal may be calculated, resulting in an accurate energy estimate for an ac-coupled, continuously-sampled signal at various count rates. The device includes a front-end electronics processing channel including primarily an analog CMOS ASIC, a bank of ADCs, an FPGA-based digital sequencer, and two RAMs. The processing electronics perform continuous digital integration of PMT signals to obtain normalized position and energy. Continuous baseline restoration (BLR) is used, wherein the baseline of the signal pulses are placed at mid-scale by continuously sampling the ADC, thus always making available the past history. A correction signal is generated for use in negative feedback control of the baseline.

A follower amplifier with power supply biased by a controlled voltage source such that the power supply potentials are, for the frequencies of interest, as close as possible to the potential of the follower output. There is proposed a front-end electronic circuit for biopotential and impedance measurements with outstanding performances (very high input impedance and gain very close to unity). Preferably, the explicit guard electrode and the explicit electronic unit at the belt are no longer necessary; all electronics is embedded in units placed directly at the measurement sites. Moreover, the proposed front-end electronic circuit allows a drastic simplification of the cabling and connectors since all units are connected to only one wire (the theoretical minimum) for potential reference and current return. Preferably, this wire does not even require an electrical isolation and can be easily embedded in the textile of a shirt, in a garment, mesh, belt, etc.

A partitioned pipeline read-out circuit architecture eliminates real-time constraints from off-chip read-out control electronics in a solid-state radiation detector system, so that an efficient decoupled architecture is possible. The front-end electronics includes a multi-channel ASIC with independently triggered charge sensitive pre-amplifiers, shaper circuits, and switched sample-and-hold capacitor circuits for each photodiode or pixel of the detector module. With this structure, individual photodiodes of the photodetector array can detect and store scintillation events independently and randomly. The ASIC is interfaced to an external successive approximation A/D converter for conversion and subsequent input to a data processing apparatus.

The invention discloses a high-precision clock distribution and phase automatic compensation system and a phase adjusting method thereof. The system comprises a clock distribution module (master) and a plurality of front-end electronics nodes (slave). The master distributes clocks to the multiple slaves by using fibers. The master sends the clocks to the slaves by the fibers; after receiving the clocks, the slaves return the clocks to the master again; the master carries out dynamic measurement on the sum of round-trip time of the clocks to obtain uplink and downlink delay time of the clocks and sends measurement results to the slaves; and according to the measurement results, the slaves carries out dynamic phase adjustment on the received clocks, so that phase synchronization of the slaves and the master can be maintained. With the system and method, the phase synchronization precision is improved and a phase adjustment error caused by the temperature change can be reduced.

The invention provides a positron emission computer tomography system and belongs to the field of medical devices. The system comprises three gamma-ray detection devices, three front-end electronics devices, three data acquisition devices, an electromechanical control device and three control devices, wherein three gamma-ray detection devices are used for generating gamma photons to hit crystals to produce visible light and converting the visible light into electric signals; three front-end electronics devices are used for determining single case information according to electric signals of corresponding gamma-ray detection devices; three data acquisition devices are used for acquiring the single case information obtained by corresponding front-end electronics devices and processing the single case information to obtain coincidence case information; the electromechanical control device is connected with data acquisition devices and is used for controlling movement of machine assemblies under the control of data acquisition devices; and three control devices which are correspondingly connected with data acquisition devices one by one are used for receiving the coincidence case information transmitted by corresponding data acquisition devices, and positron emission tomography (PET) images are obtained through processing. By the aid of the positron emission computer tomography system, the scanning speed can be accelerated, and the application range of PET can be broadened.

Multi-modal sensing relating to joint acoustic emission and joint bioimpedance. Custom-design analog electronics and electrodes provide high resolution sensing of bioimpedance, microphones and their front-end electronics for capturing sound signals from the joints, rate sensors for identifying joint motions (linear and rotational), and a processor unit for interpretation of the signals. These components are packed into a wearable form factor, which also encapsulates the hardware required to minimize the negative effects of motion artifacts on the signals.

A brain imager includes a compact ring-like static PET imager mounted in a helmet-like structure. When attached to a patient's head, the helmet-like brain imager maintains the relative head-to-imager geometry fixed through the whole imaging procedure. The brain imaging helmet contains radiation sensors and minimal front-end electronics. A flexible mechanical suspension/harness system supports the weight of the helmet thereby allowing for patient to have limited movements of the head during imaging scans. The compact ring-like PET imager enables very high resolution imaging of neurological brain functions, cancer, and effects of trauma using a rather simple mobile scanner with limited space needs for use and storage.

The invention relates to an SiPM gain control system with a temperature self-adaption function and a control method thereof, and belongs to the field of photoelectric and particle detection. The system includes a temperature sensor, a temperature measuring circuit, an A/D conversion circuit, an FPGA module, a D/A conversion circuit and a field power module which are sequentially connected. For thefact that a detector readout device SiPM is very sensitive to ambient temperature changes, the influences caused by temperature on SiPM gains are compensated for through a temperature self-adaption mode, and the validity of detected data is improved. The automatic control over SiPM bias voltage is achieved, the service life of the SiPM is greatly prolonged, the instantaneous impact of front-end electronics is eliminated, and a foundation is laid for long-term reliable application of the SiPM.

The invention discloses a detector in a nuclear medicine diagnosis device and a using method thereof, relates to the technical field of nuclear medicine, and aims to solve the problem of cost increase of a positron emission tomography (PET) detector caused by improving spatial resolution of an image in the prior art. The detector in the nuclear medicine diagnosis device comprises a scintillator crystal, a photoelectric detector, a front-end electronic circuit and a main computer, wherein the proportion of the area of a coupling surface of the scintillator crystal to the area of a coupling surface of the photoelectric detector is less than 1 to 1; the scintillator crystal is optically coupled to the photoelectric detector; and the photoelectric detector is connected to the main computer through the front-end electronic circuit. The detector in the nuclear medicine diagnosis device and the using method thereof provided by the embodiment of the invention can be applied to medical scanners such as a body scanner of PET, a body scanner of single-photon emission computed tomography (SPECT), an animal scanner, an organ scanner and the like.

The invention relates to an apparatus and method for measuring the parameters of transient plasmas in high-speed impact. The apparatus includes a multilayer grid sensor, a power source and an oscilloscope; according to the multilayer grid sensor, the energy of plasmas in space debris impact can be analyzed by using electrified grids, so that parameters including the density, energy and diffusion speed of the plasmas can be obtained; the obtained results are displayed on the oscilloscope; the multilayer grid sensor includes a shielding body, a particle screening grid, an energy scanning grid, a suppression electron grid and a collection electrode which are distributed sequentially from top to bottom; the shielding body is used for shielding an internal electric field, so that voltage applied to each layer of grid can be prevented from affecting an external plasma environment; the particle screening grid is used for distinguishing positive and negative particles; the energy scanning grid obtains energy information of the particles by applying scanning bias voltage; the suppression electron grid not only can prevent the emission of secondary electrons and photoelectrons on the collection electrode, but also can prevent interference on front-end electronics; and the collection electrode is used for collecting the plasmas.

This invention relates to a front electro device controlled by computer and used for temperature sensor signal collection and process with multiple signal collection and process channels and is used in multiple measure points automatic monitoring and controlling system. The multiple-path temperature signal pre-process circuit, which comprises machine shell, multiple temperature signal input and base voltage generation circuit. The enlarging circuit is connected to the modulation circuit with multiple output ends. The control end of the computer is connected to the multiple output modulation circuit.

The invention relates to the technical field of large detector front end electronics case structures on satellites, particularly to a plastic scintillator array detector front end electronics case of a dark matter particle detection satellite. The plastic scintillator array detector front end electronics case is characterized in that the case comprises a case body box, and the reverse side of the case body box is equipped with a high-voltage fan-out plate through a high-voltage fan-out plate strut and a fastener; one end of the case body box is equipped with a high-voltage joint panel and a wire binding frame by adoption of a fastener, and a high-voltage joint is mounted on the high-voltage joint panel; and the upper part of the case body box is equipped with a signal adapter plate through a signal adapter plate strut and a fastener. Matching of the plastic scintillator array detector front end electronics case with a detector structure is realized, performance of the detector front end electronics case is guaranteed to be stable, and requirements for capability of bearing complex space environment during in-orbit operation of an on-satellite product, high reliability of the product, compact structure and light weight are realized.

The invention provides a communication control device and method and an apparatus of the communication control device. The device comprises a first port unit and a second port unit, the first port unit is used for being connected with a front end electronics system and providing a clock and a synchronous clock for the front end electronics system; and the second port unit is used for being connected with a data conforming system and providing a clock, a synchronous clock and communication control for the data conforming system. By means of the communication control device and method and the apparatus of the communication control device, communication can be established between the front end electronics system and the data conforming system in a positron emission computed tomography (PET), and high accuracy PET measurement can be achieved.

The invention relates to a novel ship monitoring magnetic field sensor based on the ultrasonic sensing and magnetic detection technology. The sensor comprises a silicon substrate, a metal electrode, an insulating layer, a piezoelectric film, and a cavity filled with low concentration magnetic fluid. The sensor is characterized in that the sensor can emit or receive an ultrasonic wave, the viscosity of the magnetic fluid in the cavity is very sensitive to an external magnetic field, in the condition of no magnetic abnormal source, the sensor carries out ultrasonic detection in a mode of an underwater acoustic transducer, when a magnetic abnormal source appears, the sensor can carry out ultrasonic detection and magnetic detection at the same time, and the ultrasonic frequency emitted by the sensor can be controlled by applying a bias magnetic field. The ship monitoring magnetic field sensor is manufactured by using the advanced micro nano processing technology, the volume is small, the power consumption is low, the frequency band is wide, a one-dimensional line array (1D) and a two-dimensional surface array (2D) can be made, the sensor is compatible with a front-end electronic circuit, the mass production of devices is facilitated, and the sensor is suitable for coastal defense, anti submarine, warship detection, ocean topography detection and the like.

The invention relates to a three-dimensional dose measurement and detection system of a particle therapy device. The three-dimensional dose measurement and detection system comprises a detector main body, a front-end electronics system, a data acquisition device and an upper computer, wherein the detector main body is used for detecting a particle beam; the front-end electronics system is used foramplifying an ionization signal generated by the detector body; the data acquisition device is used for acquiring signals amplified by the front-end electronics system; a particle photographing system and a three-dimensional dose reconstruction system are arranged in the upper computer; the particle photographing system is used for obtaining an imaging result of a target through a pre-trained machine network model by adopting data synchronously sampled before and after the target; and the three-dimensional dose reconstruction system performs three-dimensional dose reconstruction based on a pre-measured beam parameter dose curve model according to the imaging result of the target and the dose distribution information of the beam passing through the targets with different thicknesses to obtain the three-dimensional dose distribution of the beam passing through the target.

The invention discloses a silicon micro-strip detection system. The silicon micro-strip detection system comprises a silicon micro-strip array detector, a front-end electronics unit, a rear-end data acquisition unit, an FPGA main control unit and a data processing unit arranged on an upper computer, wherein the front-end electronics unit is used for converting a charge output signal generated by the silicon micro-strip array detector into a voltage signal, comparing a voltage value with a threshold value, outputting a trigger signal for data acquisition to the main control circuit if the voltage value exceeds the threshold value, and converting the voltage signal into a serial differential current signal; the rear-end data acquisition unit is used for converting the serial differential current signal into a digital quantity; the FPGA main control unit is used for providing enable signals for the front-end electronics circuit and the rear-end data acquisition circuit after receiving trigger signals of data acquisition, reading data output by the rear-end data acquisition circuit and storing the data; and the data processing unit is used for receiving data of the silicon micro-strip array detector and determining the position and energy of spatial particles incident on the silicon micro-strip array detection unit.

A valve device includes a valve having an electrodynamic actuator. The electrodynamic actuator includes a movably mounted control element having a coil and a magnet arrangement immovable relative to the coil. A driving force caused by energization of the coil and transmitted to the control element substantially is linearly dependent on the current intensity. A front-end electronic unit is connected with the coil and includes a capacitor connected in parallel to the coil. A method for controlling a valve as mentioned above provides that, upon actuation of the electrodynamic actuator, during energization of the coil by a voltage source, a capacitor connected in parallel to the coil is charged. After termination of the energization by the voltage source, the coil is energized further by a discharge of the capacitor.

An ultrasonic pool occupant sensing device capable of using ultrasonic pulses to analyze the occupancy level of a swimming pool. An ultrasonic transducer sends and receives ultrasonic pulses. A front end electronics has a driver for controlling the transducer, a pre-amplifier, band-pass filter, and amplifier combination for filtering received signals. The digital processing unit contains a timer unit for generating pulses, an AD converter for digitizing received pulses, a signal processor for determining data about the return pulse, and an I/O unit for transmitting data to the central processing unit. The data may be an estimate of the number of people in the sensor range, or it may be data about the return pulse that can be analyzed by the central processing unit.

The invention relates to the technical field of security and protection, in particular to a network electronic fence system based on temperature detection and an implementation method of the network electronic fence system. The system comprises a pulse host module, a front-end electronic fence, a front-end switch module, a server module, a camera module and a temperature sensor module. Through mutual transmission among the pulse host module, the front-end electronic fence, the front-end switch module, the server module, the camera module and the temperature sensor module, the type of an intruder can be detected more accurately, and corresponding alarm processing can be executed.