Systems for PET imaging

1. An imaging system, comprising:

a detector assembly including a plurality of detector modules and a detector support configured to support the plurality of detector modules, wherein

the detector support has a plurality of guide units,

the plurality of guide units are configured to facilitate mounting of the plurality of detector modules and limit movement of the plurality of detector modules,

at least one of the plurality of guide units includes a guide plate arranged along an axial direction of the scanning channel,

the guide plate includes a guide rail, and

at least one of the plurality of detector modules includes at least one guide piece complementary to the guide rail; and

a gantry assembly including a main gantry, a back cover plate, and a gantry base configured to support the main gantry, wherein a portion of the main gantry forms a front face of a scanning channel, a portion of the back cover plate forms a back face of the scanning channel, and a portion of the detector assembly forms a sidewall of the scanning channel.

2. The system of claim 1 , wherein the at least one of the plurality of guide units includes a limit piece configured to limit a movement of the at least one of the plurality of detector modules.

3. The system of claim 2 , wherein the limit piece is located at one end of the at least one of the plurality of the guide units away from the main gantry.

4. The system of claim 3 , wherein each of the plurality of detector modules has a corresponding limit piece.

5. The system of claim 2 , wherein the plurality of guide units include a plurality of guide plates distributed along the scanning channel circumferentially, at least one of the plurality of guide plates includes a limit sheet, and the at least one of the plurality of detector modules includes a limit block corresponding to the limit sheet.

6. The system of claim 2 , wherein the plurality of guide units include a plurality of guide columns, and the at least one of the plurality of detector modules includes a guide hole corresponding to one of the plurality of guide columns.

7. The system of claim 1 , wherein the at least one of the plurality of detector modules is located between two adjacent guide plates, at least a portion of a first side of the at least one of the plurality of detector modules faces and is parallel to a first surface of one of the two adjacent guide plates, at least a portion of a second side of the at least one of the plurality of detector modules faces and is parallel to a second surface of the other of the two adjacent guide plates, and wherein the guide rail is located on one or both of the first surface and the second surface.

8. The system of claim 7 , wherein the guide rail includes a groove, and the at least one of the plurality of detector modules is configured with a protrusion complimentary to the groove.

9. The system of claim 1 , wherein the detector assembly has a first side and a second side along an axial direction of the scanning channel, the first side is closer to the front face of the scanning channel than the second side, and the detector assembly further includes:

a first ring located on the first side of the detector assembly; and

a second ring located on the second side of detector assembly, wherein at least one of the first ring or the second ring includes at least two segments.

10. The system of claim 9 , wherein at least one segment of the second ring includes a fixing brim configured to fix the at least one segment of the second ring.

11. The system of claim 9 , wherein at least one segment of the second ring includes a handle away from the plurality of detector modules.

12. The system of claim 9 , wherein the first ring or the second ring includes a flange including a protrusion toward the plurality of detector modules.

13. The system of claim 1 , further comprising a detector cover configured to cover the detector support.

14. The system of claim 13 , wherein the detector cover includes a plurality of first-type sub detector covers fixed on the main gantry and a plurality of second-type sub detector covers held in place by the plurality of first-type sub detector covers.

15. The system of claim 14 , wherein the plurality of first-type sub detector covers and the plurality of second-type sub detector covers are arranged alternately.

16. The system of claim 14 , wherein at least one of the plurality of first-type sub detector covers or at least one of the plurality of second-type sub detector covers includes a curved piece and a connecting piece.

17. The system of claim 1 , wherein the main gantry includes a front cover plate, the system further comprising:

a position adjustment device configured to adjust a position of the front cover plate relative to the main gantry.

18. The system of claim 17 , wherein the position adjustment device includes N moving pieces and N adjustment pieces corresponding to the N moving pieces, the position adjustment device is connected to the main gantry, a first moving piece is connected to the front cover plate, a first adjustment piece is configured to move the front cover plate along a first direction, an nth moving piece is connected to a (n−1)th moving piece, an nth adjustment piece is configured to move the nth moving piece or the (n−1)th moving piece along an nth direction, and wherein N is a natural number equal to or greater than 2, and n is a natural number less than or equal to N.

19. The system of claim 18 , wherein the N adjustment pieces include a plurality of sliding chambers or a plurality of sliding guide rails along N directions, respectively, an mth adjustment piece is configured to move an mth moving piece along an mth sliding chamber or an mth sliding guide rail, and wherein m is a positive integer less than or equal to N.