Detector module, detector and medical device

A detector comprising:

• a housing;
• and
• a plurality of detector modules arranged in parallel along a first direction on the housing and configured to detect rays emitted from a radiation source and attenuated by a subject,
• wherein each of the plurality of detector modules comprises:
• a support extending in the first direction, a top of the support comprising a plurality of positioning surfaces spaced by a plurality of protrusions along the first direction, and
• a plurality of detector sub-modules arranged on the plurality of positioning surfaces of the support along the first direction, each of the plurality of detector sub-modules being arranged on a respective positioning surface of the plurality of positioning surfaces and being positioned between two respective adjacent protrusions of the plurality of protrusions on both ends of the respective positioning surface along the first direction,
• wherein a top surface of each of the plurality of detector sub-modules is tangent to a respective spherical surface of a corresponding target sphere of at least two target spheres having different radiuses,
• wherein a respective sphere center of each of the at least two target spheres is substantially overlapped with a focal spot of the radiation source,
• wherein, for each of the plurality of detector sub-modules, the respective positioning surface is tangent to a corresponding position sphere, and the top surface of the detector sub-module is tangent to the respective sphere surface of the corresponding target sphere of the at least two target spheres, and
• wherein a difference between a first radius of the corresponding positioning sphere and a second radius of the corresponding target sphere is substantially identical to a thickness of the detector sub-module along a second direction defined by a line connecting a midpoint of the support and the focal spot of the radiation source.

A medical device comprising:

• a scanning gantry comprising a bore to accommodate a subject;
• a radiation source configured to emit rays to the subject;
• a scanning table configured to support the subject;
• and
• a detector configured to detect the rays attenuated by the subject and convert the detected rays into electrical signals, the detector and the radiation source being opposite inside the scanning gantry;
• wherein the detector comprises:
• a housing;
• and
• a plurality of detector modules arranged in parallel along a first direction on the housing and configured to detect rays emitted from a radiation source and attenuated by a subject,
• wherein each of the plurality of detector modules comprises:
• a support extending in the first direction, a top of the support comprising a plurality of positioning surfaces spaced by a plurality of protrusions along the first direction, and
• a plurality of detector sub-modules arranged on the plurality of positioning surfaces of the support along the first direction, each of the plurality of detector sub-modules being arranged on a respective positioning surface of the plurality of positioning surfaces and being positioned between two respective adjacent protrusions of the plurality of protrusions on both ends of the respective positioning surface along the first direction,
• wherein a top surface of each of the plurality of detector sub-modules is tangent to a respective spherical surface of a corresponding target sphere of at least two target spheres having different radiuses,
• wherein a respective sphere center of each of the at least two target spheres is substantially overlapped with a focal spot of the radiation source,
• wherein a line connecting a midpoint of the support and the focal spot of the radiation source defines a second direction, and the first direction and the second direction define a plane, and
• wherein, for each of the plurality of detector sub-modules,
• an arc of the top surface of the detector sub-module on the plane is tangent to a target circle of the corresponding target sphere on the plane at a midpoint of the arc, and
• a distance between a circle center of the target circle and the focal spot of the radiation source is less than 1 mm.