Systems, apparatuses, and methods for data acquisition in pet

1 . A system, comprising:

at least one storage device including a set of instructions; and

at least one processor in communication with the at least one storage device, wherein when executing the set of instructions, the at least one processor is directed to cause the system to perform operations including:

obtaining, based on outputs of multiple pairs of detectors of a Positron Emission Tomography (PET) scanner, coincidence events corresponding to multiple LORs, the outputs of the multiple pair of detectors being acquired during a PET scan on a subject;

determining, based on a count of coincidence events corresponding to each LOR of at least a portion of the multiple LORs, a detection rate corresponding to the LOR;

determining one or more target LORs based on a reference detection rate and the detection rate corresponding to each LOR of the at least a portion of the multiple LORs; and

performing a compensation associated with the coincidence events corresponding to each of the one or more target LORs based on the detection rate corresponding to the target LOR.

2 . The system of claim 1 , wherein for each LOR of at least a portion of the multiple LORs, the operations include:

determining the count of the coincidence events corresponding to the LOR in a time period; and

determining the detection rate corresponding to the LOR in the time period based on the count of the coincidence events.

3 . The system of claim 2 , wherein each of the coincident events corresponding to the multiple LORs includes information of a pair of detectors, and the determining the count of the coincidence events corresponding to the LOR includes:

determining, based on the information of the pair of detectors included in the each of the coincidence events corresponding to the multiple LORs, identities of the multiple LORs; and

determining the count of the coincidence events corresponding to the LOR by counting coincident events corresponding to LORs with the same identity of the LOR.

4 . The system of claim 3 , wherein the system includes multiple counters each of which corresponds to an identity of a LOR, and the determining the count of the coincidence events corresponding to the LOR includes:

determining a counter corresponding to the LOR; and

obtaining the count of the coincidence events corresponding to the LOR by updating a cumulative count of the counter corresponding to the LOR at a current time until the current time is an ending time of the time period.

5 . The system of claim 4 , wherein the counter corresponding to the LOR is determined based on a lookup table and the identity of the LOR, the lookup table provides a relationship between identities of the multiple LORs and identities of the multiple counters.

6 . The system of claim 2 , wherein the operations include initializing the count of the coincidence events corresponding to the LOR at the beginning of a next time period.

7 . The system of claim 1 , wherein the operations include determining and outputting the detection rate corresponding to each of the at least a portion of the multiple LORs every time period.

8 . The system of claim 1 , wherein the determining one or more target LORs based on a reference detection rate and the detection rate corresponding to each LOR of the at least a portion of the multiple LORs include:

for each LOR of the at least a portion of the multiple LORs, comparing the detection rate corresponding to the LOR with the reference detection rate corresponding to the LOR to determine the one or more target LORs.

9 . The system of claim 8 , wherein the detection rate corresponding to the target LOR is less than the reference detection rate.

10 . The system of claim 1 , wherein the reference detection rate is determined according to operations including:

causing the PET scanner to perform a PET scan on a reference subject;

detecting reference coincidence events corresponding to each of the multiple LORs based on outputs of a pair of detectors when the PET scan is performed on the reference subject; and

determining the reference detection rate based on a count of the reference coincidence events.

11 . The system of claim 10 , wherein the determining the reference detection rate based on the count of reference coincidence events includes:

determining candidate detection rates each of which corresponds to one of the multiple LORs based on the count of the reference coincidence events corresponding to each of the multiple LORs; and

determining the reference detection rate based on the candidate detection rates.

12 . The system of claim 1 , wherein the reference detection rates corresponding to the at least a portion of the multiple LORs are the same.

13 . The system of claim 1 , wherein the operations further include:

outputting the detection rate corresponding to the each of the at least a portion of the multiple LORs to a monitoring apparatus, the monitoring apparatus being configured to provide a reminder or control in response to determining that a detection rate corresponding to a LOR is abnormal.

14 . The system of claim 1 , wherein the plurality of coincidence events corresponding to the LOR determined based on the outputs of the pair of detectors are generated in a target time period, wherein the target time period is a portion or a segment of the total time period of the PET scan, and

the detection rate corresponding to each of at least a portion of the multiple LORs in the target time period is determined based on a count of the plurality of coincidence events corresponding to the LOR generated in the target time period.

15 . The system of claim 1 , wherein the performing a compensation associated with the coincidence events corresponding to each of the one or more target LORs based on the detection rate corresponding to the target LOR comprises:

determining a compensation coefficient corresponding to the target LOR based on the reference detection rate and the reference rate of the target LOR;

duplicating a portion of the coincidence events corresponding to the target LOR based on the compensation coefficient corresponding to the target LOR.

16 . The system of claim 1 , further comprising:

obtaining compensated coincidence events corresponding to one or more target LORs; and

reconstructing one or more PET images based on the compensation coincidence events corresponding to the one or more target LORs and coincidence events corresponding to one or more remaining LORs among the multiple LORs excepting the one or more target LORs.

17 . The system of claim 1 , wherein the PET scanner includes an electronics assembly supported by a gantry of the PET scanner, and an apparatus for data acquisition is included in the electronics assembly.

18 . A method implemented on a computing device including at least one processor and a storage device, the method comprising:

obtaining, based on outputs of multiple pairs of detectors of a Positron Emission Tomography (PET) scanner, coincidence events corresponding to multiple LORs, the outputs of the multiple pair of detectors being acquired during a PET scan on a subject;

determining, based on a count of coincidence events corresponding to each LOR of at least a portion of the multiple LORs, a detection rate corresponding to the LOR;

determining one or more target LORs based on a reference detection rate and the detection rate corresponding to each LOR of the at least a portion of the multiple LORs; and

performing a compensation associated with the coincidence events corresponding to each of the one or more target LORs based on the detection rate corresponding to the target LOR.

19 . The method of claim 18 , wherein for each LOR of at least a portion of the multiple LORs, the method includes:

determining the count of the coincidence events corresponding to the LOR in a time period; and

determining the detection rate corresponding to the LOR in the time period based on the count of the coincidence events.

20 . A non-transitory computer readable medium, comprising at least one set of instructions, wherein when executed by one or more processors of a computing device, the at least one set of instructions causes the computing device to perform a method, the method comprising:

obtaining, based on outputs of multiple pairs of detectors of a Positron Emission Tomography (PET) scanner, coincidence events corresponding to multiple LORs, the outputs of the multiple pair of detectors being acquired during a PET scan on a subject;

determining, based on a count of coincidence events corresponding to each LOR of at least a portion of the multiple LORs, a detection rate corresponding to the LOR;

determining one or more target LORs based on a reference detection rate and the detection rate corresponding to each LOR of the at least a portion of the multiple LORs; and

performing a compensation associated with the coincidence events corresponding to each of the one or more target LORs based on the detection rate corresponding to the target LOR.