Detector heat dissipation device and PET (positron emission tomography) system

The utility model discloses a detector heat dissipation device and a PET system, the detector heat dissipation device comprises a detector heat dissipation plate, a heat dissipation fan and an air cooling element, the heat dissipation plate comprises a packaging part and a hollow part, the packaging part is provided with a packaged cooling liquid flow channel, and the cooling liquid flow channel extends in a winding manner; the heat dissipation fan is arranged at one end of the detector heat dissipation plate; the air cooling element comprises a cold air fan and a fan mounting plate, an air cooling liquid flow channel is arranged on the periphery of the fan mounting plate, and the air cooling liquid flow channel communicates with the cooling liquid flow channel through a connecting pipeline so as to cool the hollow part. According to the detector cooling device, the packaged cooling liquid flow channel is adopted to carry out water cooling on the to-be-cooled detector, hot air in the detector is sucked throug