Analog — Digital

Multi-Voltage Threshold:

Multi-Voltage Threshold (MVT ) is a sampling method first proposed by digital pet laboratory and different from traditional ADC sampling. Different from the traditional ADC's transverse voltage sampling method based on time axis, MVT digital method is a longitudinal sampling method. By setting n threshold voltages in advance, then recording the specific time TN when the flicker pulse amplitude reaches each threshold voltage, the time threshold sampling point Sn (TN, VN) is obtained. 2n sampling points will be obtained by the same processing of rising edge and falling edge of flicker pulse. According to the characteristics of scintillation pulse, the model is established, and the scintillation pulse can be reconstructed by fitting these sampling points. Based on this, the relevant time information, energy information and location information can be extracted.

All Digtal PET Detector:

PET laboratory is committed to design and develop high-performance all digital PET detector with MVT technology as the core and digital, modular and standardized as the guide.

MVT digital method is used to accurately extract the location, energy and time information of a single event and complete the high-precision restoration of the signal; modular design is used to organically divide the detector into different functional modules, simplify the system design to increase the scalability of the system function, facilitate the debugging, maintenance and update of the system, and facilitate the automation of the system Calibration: standardized design is adopted to define the software and hardware interfaces of each module to form a complete open platform.

Detector Module (lyso + SIPM):

Data Acquisition Module（MVT）：

Detector：

PnI

On the basis of innovative PET detector technology, the team redesigned the system architecture of PET imaging instrument from the top, and developed a new digital pet R & D platform of plug & imaging (PNI). Based on the platform, researchers can use different performance indicators of modular PET detector according to different imaging objects and tasks, so as to achieve different geometry PET imaging system The platform provides an open architecture for the digital PET imaging instrument, which makes the pet system no longer limited to the specific detector design, photoelectric devices and scintillation crystals, and realizes the flexibility, expansibility and reusability of the diversified detector design This platform makes it possible to apply special and adaptive pet for various applications, and gives birth to a new pet system such as helmet type pet system Moreover, the platform realizes the decoupling between PET detectors from the overall system structure of pet, the event information is sent to the computing server independently, the traditional pet coincidence circuit is cancelled, and the software coincidence is realized. The performance of PET system can directly benefit from the rapid development of consumer electronics and computer industry in computing, storage, data transmission and other aspects.