Shenyang Neusoft Medical Systems Co., Ltd.

Neusoft Medical Systems Co., Ltd.

Long Yang

Guodong Liang

Peng Gao

Yuqiu Zhao

Peng Ning

Jun Zhang

Gai Cui

Liang He

Nan Li

Zhiguo Wang

Guoxu Zhang

Zhenguo Zhang

Zhuxia Yin

A Position Emission Tomography (PET) system is provided in the present disclosure. According to an example, the PET system includes a detector and a host computer, where the detector includes: a plurality of detector rings; each of the detector rings including n number of collecting modules arranged in a circumferential direction of the detector ring, where n is an integer greater than 1; a first collecting module of the n number of collecting modules coupled with the host computer; an n-th collecting module of the n number of collecting module coupled with a (n&#x2212;1)-th collecting module; and an i-th collecting module coupled with an (i&#x2212;1)-th collecting module, where i is an integer greater than 1 and less than n.

Transmitting data in PET system

A method for determining a pair of compliance events is provided. A set of event data collected by a PET detector may be divided into N sub-sets, and each of the N sub-sets of event data may be sorted according to an occurrence time of each event included in the event data, wherein N is an integer greater than or equal to 2. A K stage heapsort may be performed on the sorted N sub-sets of event data according to the occurrence time of each event, so as to sequentially output data of each event in the sorting order, wherein K is an integer greater than or equal to 1. A time compliance determination and a space compliance determination may be performed on the sequentially-outputted event data, and a pair of compliance events may be determined if both the time compliance determination and the space compliance determination are passed.

Determining a pair of compliance events

A system and method of a PET imaging are provided. According to an example, a detector, a movement control module, a power control module and a reconstructing computer may be connected to a switch in a form of a star-shaped network topology. The detector may include M*N detector units distributed in an annular structure, each detector unit may be allocated with an IP address, M detector units are evenly distributed on each circumferential direction of the annular structure, and N detector units are evenly distributed on each axial direction of the annular structure. Each of the detector units may transmit a set of acquired data to the reconstructing computer through the switch via a network bus; and the set of data may include location information, acquiring time information and IP address. The reconstructing computer may perform a compliance process on all sets of data acquired by the detector according to the location information, acquiring time information and IP address, and reconstruct an image with the compliance data determined by the compliance process.

Positron emission tomography imaging

Methods, systems, and machine-readable storage mediums for clock synchronizing among detectors in a clock synchronizing configuration are provided. An example clock synchronizing method includes: providing a clock of a preset frequency in each of N modules to be synchronized, coupling every two adjacent modules of the modules by a transmission line of the same length, N being an odd number, selecting two different modules from the modules as two reference modules respectively, controlling each of the reference modules to transmit a synchronizing signal to the other modules, determining a clock error between every two modules having the same transmission distance from the reference module according to a moment of the synchronizing signal reaching each of the other modules, selecting a calibrating module from the modules, and implementing clock synchronization between each of the modules and the calibrating module according to the respective clock errors associated with the two reference modules.

Clock synchronizing

Methods, devices and computer-readable mediums for clock synchronization are provided. The methods include receiving a synchronizing clock in a unit clock cycle of a measuring clock, calibrating position information of a rising edge of the synchronizing clock in the unit clock cycle, determining a phase difference between the measuring clock and the synchronizing clock in the unit clock cycle based on the calibrated position information, and compensating a photon time in the unit clock cycle with the determined phase difference as a time compensation value.

Clock synchronization between time calibration boards

A method and a PET apparatus are provided. According to an example of the method, a saturation indicia of a target detector may be determined through simulating emission of a &#x3b3; photon to the target detector. The target detector is any one of SiPM detectors of a PET apparatus. The saturation indicia is for designating a maximum output voltage after amplifying an output of the target detector through a VGA when one &#x3b3; photon is received by the target detector. The target VGA is a VGA corresponding to the target detector. By comparing an output voltage of the target VGA and the saturation indicia, it may determine that the target detector received a saturation event if the output voltage of the target VGA is higher than the saturation indicia. An amplifier gain of the target VGA may be adjusted until an amount of the saturation events detected by the target detector in unit time satisfies a pre-determined threshold.

Method and PET apparatus

A timing method and a timing device are disclosed. A Gray code count output may be obtained by performing a Gray code count on a basic clock. Then m number of sub-clocks may be obtained by separately performing a phase shift on a least significant bit output of the Gray code count output, where a phase difference &#x3c6; between each of the m number of sub-clocks and the least significant bit output may satisfy: &#x3c6;=n&#xd7;&#x3b1; and &#x3c6;&#x2260;90&#xb0;, 180&#xb0; may be divisible by &#x3b1; with no remainder, and n may be an integer greater than 0 and less than 180&#xb0;/&#x3b1;. If 90&#xb0; is divisible by &#x3b1; with no remainder, m=180/&#x3b1;&#x2212;2; and if 90&#xb0; is divisible by &#x3b1; with a remainder, m=180/&#x3b1;&#x2212;1. When a predetermined event occurs, a timing result of the predetermined event may be obtained according to the Gray code count output value, outputs of the m number of sub-clocks, a period of the basic clock, and the &#x3b1;.

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Shenyang, China

Long Yang