Transmitting data in PET system

1. A Positron Emission Tomography (PET) system, comprising:

a detector, configured to detect a γ-photon generated by an annihilation event and transmit photon information to a host computer; and

the host computer, configured to conduct a determination of a coincidence event based on the photon information;

wherein the detector comprises:

a plurality of detector rings;

each of the detector rings comprising n number of collecting modules arranged in a circumferential direction of the detector ring, wherein n is an integer greater than 1, and each of the collecting modules comprising a scintillation crystal and a photoelectric conversion circuit;

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 an (n−1)-th collecting module; and

an i-th collecting module coupled with an (i−1)-th collecting module, wherein i is an integer greater than 1 and less than n; wherein

the n-th collecting module is configured to transmit a data packet collected by itself to the (n−1)-th collecting module;

the i-th collecting module is configured to transmit a data packet obtained by superposing a data packet collected by itself with a data packet received from an (i+1)-th collecting module to the (i−1)-th collecting module;

the first collecting module is configured to transmit a data packet obtained by superposing a data packet collected by itself with a data packet received from a second collecting module to the host computer; and

the host computer is configured to conduct the determination of the coincidence event based on the data packet received from the first collecting module,

wherein

the first collecting module is further configured to

receive instruction information from the host computer,

obtain a control instruction corresponding to the first collecting module from the instruction information, and

transmit the instruction information to the second collecting module;

the i-th collecting module is further configured to

receive the instruction information from the (i−1)-th collecting module,

obtain a control instruction corresponding to the i-th collecting module from the instruction information, and

transmit the instruction information to the (i+1)-th collecting module; and

the n-th collecting module is further configured to

receive the instruction information from the (n−1)-th collecting module, and

obtain a control instruction corresponding to the n-th collecting module from the instruction information.

2. The system according to claim 1 , wherein

the n number of collecting modules are coupled in sequence by a serial bus comprising an uplink and a downlink;

the uplink is configured to transmit a data packet from a j-th collecting module to a (j−1)-th collecting module, wherein j is an integer greater than 1 but not greater than n; and

the downlink is configured to transmit the instruction information from the (j−1)-th collecting module to the j-th collecting module.

3. The system according to claim 1 , wherein a data packet collected by each of the collecting modules comprises a time slot, an address of the collecting module, and data information.

4. The system according to claim 3 , wherein

the data packet transmitted from the i-th collecting module to the (i−1)-th collecting module is obtained by superposing the data packet collected by the i-th collecting module with the data packet received from the (i+1)-th collecting module in an order of respective addresses of the collecting modules; and

the data packet transmitted from the first collecting module to the host computer is obtained by superposing the data packet collected by the first collecting module with the data packet received from the second collecting module in the order of respective addresses of the collecting modules.

5. A data transmitting device in a PET system, comprising:

n number of collecting modules in a serial connection, wherein

the n number of collecting modules comprise an n-th collecting module, an i-th collecting module, and a first collecting module;

n is an integer greater than 1;

i is an integer greater than 1 and less than n;

each of the collecting modules comprises a scintillation crystal and a photoelectric conversion circuit;

the n-th collecting module is configured to transmit a data packet collected by itself to an (n−1)-th collecting module;

the i-th collecting module is configured to transmit a data packet obtained by superposing a data packet collected by itself with a data packet received from an (i+1)-th collecting module to an (i−1)-th collecting module;

the first collecting module is configured to transmit a data packet obtained by superposing a data packet collected by itself with a data packet received from a second collecting module to a host computer; and

the host computer is configured to conduct a determination of a coincidence event based on the data packet received from the first collecting module,

wherein

the first collecting module is further configured to

receive instruction information from the host computer,

obtain a control instruction corresponding to the first collecting module from the instruction information, and

transmit the instruction information to the second collecting module;

the i-th collecting module is further configured to

receive the instruction information from the (i−1)-th collecting module,

obtain a control instruction corresponding to the i-th collecting module from the instruction information, and

transmit the instruction information to the (i+1)-th collecting module; and

the n-th collecting module is further configured to

receive the instruction information from the (n−1)-th collecting module, and

obtain a control instruction corresponding to the n-th collecting module from the instruction information.

6. The device according to claim 5 , wherein

the n number of collecting modules are coupled in sequence by a serial bus comprising an uplink and a downlink;

the uplink is configured to transmit a data packet from a j-th collecting module to a (j−1)-th collecting module, wherein j is an integer greater than 1 but not greater than n; and

the downlink is configured to transmit the instruction information from the (j−1)-th collecting module to the j-th collecting module.

7. The device according to claim 5 , wherein a data packet collected by each of the collecting modules comprises a time slot, an address of the collecting module, and data information.

8. The device according to claim 7 , wherein

the data packet transmitted from the i-th collecting module to the (i−1)-th collecting module is obtained by superposing the data packet collected by the i-th collecting module with the data packet received from the (i+1)-th collecting module in an order of respective addresses of the collecting modules; and

the data packet transmitted from the first collecting module to the host computer is obtained by superposing the data packet collected by the first collecting module with the data packet received from the second collecting module in the order of respective addresses of the collecting modules.

9. A method of transmitting data in a PET system, applied to a detector ring in the PET system, wherein

the detector ring comprises n number of collecting modules comprising an n-th collecting module, an i-th collecting module, and a first collecting module, where each of the collecting modules comprises a scintillation crystal and a photoelectric conversion circuit;

the n number of collecting modules are in a serial connection, wherein the n number of collecting modules are coupled in sequence by a serial bus including an uplink and a downlink, the uplink is configured to transmit a data packet from a j-th collecting module to a (j−1)-th collecting module, j being an integer greater than 1 but not greater than n, and the downlink is configured to transmit instruction information from the (j−1)-th collecting module to the j-th collecting module;

n is an integer greater than 1; and

i is an integer greater than 1 and less than n;

the method comprising:

transmitting, by the n-th collecting module, a data packet collected by itself to an (n−1)-th collecting module;

transmitting, by the i-th collecting module, a data packet obtained by superposing a data packet collected by itself with a data packet received from an (i+1)-th collecting module to an (i−1)-th collecting module;

transmitting, by the first collecting module, a data packet obtained by superposing a data packet collected by itself with a data packet received from a second collecting module to a host computer; and

conducting, by the host computer, a determination of a coincidence event based on the data packet received from the first collecting module,

the first collecting module

receiving the instruction information from the host computer,

obtaining a control instruction corresponding to the first collecting module from the instruction information, and

transmitting the instruction information to the second collecting module;

the i-th collecting module

receiving the instruction information from the (i−1)-th collecting module,

obtaining a control instruction corresponding to the i-th collecting module from the instruction information, and

transmitting the instruction information to the (i+1)-th collecting module, and

the n-th collecting module

receiving the instruction information from the (n−1)-th collecting module, and

obtaining a control instruction corresponding to the n-th collecting module from the instruction information.

10. The method according to claim 9 , wherein a data packet collected by each of the collecting modules itself comprises a time slot, an address of the collecting module, and data information.

11. The method according to claim 10 , wherein

the data packet transmitted from the i-th collecting module to the (i−1)-th collecting module is obtained by superposing the data packet collected by the i-th collecting module with the data packet received from the (i+1)-th collecting module in an order of respective addresses of the collecting modules; and

the data packet transmitted from the first collecting module to the host computer is obtained by superposing the data packet collected by the first collecting module with the data packet received from the second collecting module in the order of respective addresses of the collecting modules.