Detector structure in a PET system

1. A PET detector, comprising:

a plurality of detector modules;

wherein each detector module comprising a scintillator, a light guide and a photodetector with the light guide optically coupled to the scintillator to provide a light path to the photodetector; and

a plurality of installing modules each having an interior surface and an exterior surface configured to install one detector module on the interior surface to form a plurality of detector assemblies,

wherein the detector assemblies are coupled together to form a detector ring having the interior surfaces of the installing modules forming an inner circumference surface of the ring and the exterior surfaces of the installing modules forming an outer circumference surface of the ring, such that the detector modules are installed on the inner circumference surface of the ring;

wherein the plurality of installing modules include a first chain piece and a second chain piece, the first chain piece and the second chain piece being adjacent, wherein each of the first chain piece and the second chain piece includes:

a convex part at one end along a circumferential direction of the detector ring; and

a recessed part at the other end along the circumferential direction of the detector ring,

wherein the convex part of the first chain piece is coupled to the recessed part of the second chain piece via a rotation axis;

wherein the second chain piece further includes a position-limiting surface on one end of the second chain piece adjacent to the first chain piece, and wherein the position-limiting surface is configured to determine an angle formed by the first chain piece and the second chain piece.

2. The PET detector of claim 1 , wherein at least one of the plurality of installing modules includes a chain piece, and the chain piece further includes an installing groove on a surface connected to one of the plurality of detector modules,

the one of plurality of detector modules further includes a sliding part corresponding to the installing groove, and

wherein the sliding part is installed in the installing groove.

3. The PET detector of claim 1 , further comprising:

at least two detector rings formed by the plurality of detector modules and the plurality of installing modules, wherein the at least two detector rings are arranged parallel to an axial direction of the at least two detector rings.

4. A PET detector, comprising:

a plurality of detector modules;

wherein each detector module comprising a scintillator, a light guide and a photodetector with the light guide optically coupled to the scintillator to provide a light path to the photodetector; and

a plurality of installing modules each having an interior surface and an exterior surface configured to install one detector module on the interior surface to form a plurality of detector assemblies, wherein the detector assemblies are coupled together to form a detector ring having the interior surfaces of the installing modules forming an inner circumference surface of the ring and the exterior surfaces of the installing modules forming an outer circumference surface of the ring, such that the detector modules are installed on the inner circumference surface of the ring;

wherein the plurality of installing modules include a first chain piece and a second chain piece, the first chain piece and the second chain piece being adjacent, wherein each of the first chain piece and the second chain piece includes two hinge parts on both ends along a circumferential direction of the detector ring, and a rotation axis corresponding to each of the two hinge parts, wherein the first chain piece and the second chain piece are coupled together by the respective hinge parts and the rotation axis.

5. The PET detector of claim 4 , wherein the rotation axis is located at a position of the hinge part close to the center of the detector ring.

6. The PET detector of claim 5 , further comprising:

a connection part configured to connect the first chain piece and the second chain piece.

7. The PET detector of claim 6 , wherein each of the first chain piece and the second chain piece further includes a stabilizing plate and the connection part is configured to connect the stabilizing plates of the first chain piece and the second chain piece.

8. The PET detector of claim 6 , wherein the connection part is further configured to determine an adjacent angle formed by the first chain piece and the second chain piece.

9. A PET detector, comprising: at least two detector rings arranged parallel to an axial direction of the at least two detector rings, each ring formed by a plurality of detector modules and a plurality of installing modules,

wherein each detector module comprising a scintillator, a light guide and a photodetector with the light guide optically coupled to the scintillator to provide a light path to the photodetector,

wherein each installing module has an interior surface and an exterior surface configured to install one detector module on the interior surface to form a detector assembly,

wherein detector assemblies are sequentially connected to form a detachable ring structure, having the interior surfaces of the installing modules forming an outer circumference surface of the ring structure and the exterior surfaces of the installing modules forming an inner circumference surface of the ring structure and the outer and inner circumference surfaces spaced apart along a radial direction of the detachable ring structure, and the plurality of detector modules are continuously arranged along the inner circumference surface of the detachable ring structure;

wherein the plurality of installing modules include a first chain piece and a second chain piece, the first chain piece and the second chain piece being adjacent, wherein each of the first chain piece and the second chain piece includes:

a convex part at one end along a circumferential direction of the detachable ring structure; and

a recessed part at the other end along the circumferential direction of the detachable detector ring,

wherein the convex part of the first chain piece is coupled to the recessed part of the second chain piece via a rotation axis;

wherein the second chain piece further includes a position-limiting surface on one end of the second chain piece adjacent to the first chain piece; and

wherein the position-limiting surface is configured to determine an angle formed by the first chain piece and the second chain piece.

10. The PET detector of claim 9 , wherein at least one of the plurality of installing modules includes a chain piece, and the chain piece further includes an installing groove on a surface connected to one of the plurality of detector modules,

the one of plurality of detector modules further includes a sliding part corresponding to the installing grove, and

wherein the sliding part is installed in the installing groove.

11. The PET detector of claim 9 ,

wherein the axially parallel at least two detector rings are connected to each other axially.

12. A PET detector, comprising: at least two detector rings arranged parallel to an axial direction of the at least two detector rings, each ring formed by a plurality of detector modules and a plurality of installing modules,

wherein each detector module comprising a scintillator, a light guide and a photodetector with the light guide optically coupled to the scintillator to provide a light path to the photodetector,

wherein each installing module has an interior surface and an exterior surface configured to install one detector module on the interior surface to form a detector assembly,

wherein detector assemblies are sequentially connected to form a detachable ring structure, having the interior surfaces of the installing modules forming an outer circumference surface of the ring structure and the exterior surfaces of the installing modules forming an inner circumference surface of the ring structure and the outer and inner circumference surfaces spaced apart along a radial direction of the detachable ring structure, and the plurality of detector modules are continuously arranged along the inner circumference surface of the detachable ring structure;

wherein the plurality of installing modules include a first chain piece and a second chain piece, the first chain piece and the second chain piece being adjacent,

wherein each of the first chain piece and the second chain piece includes two hinge parts on both ends along a circumferential direction of the detachable detector ring, and a rotation axis corresponding to each of the two hinge parts, wherein the first chain piece and the second chain piece are coupled together by the respective hinge parts and the rotation axis.

13. The PET detector of claim 12 , wherein the rotation axis is located at a position of the hinge part close to the center of the detachable detector ring.

14. The PET detector of claim 13 , further comprising:

a connection part configured to connect the first chain piece and the second chain piece.

15. The PET detector of claim 14 , wherein each of the first chain piece and the second chain piece further includes a stabilizing plate and the connection part is configured to connect the stabilizing plates of the first chain piece and the second chain piece.

16. The PET detector of claim 14 , wherein the connection part is further configured to determine an adjacent angle formed by the first chain piece and the second chain piece.