Radiological imaging system

A radiological imaging system, comprising:

• a bed for carrying an examinee,
• a positron emission CT imaging apparatus and an X-ray CT imaging apparatus disposed along a longitudinal direction of said bed,
• wherein said positron emission CT imaging apparatus includes a plurality of unit substrates including a plurality of semiconductor radiation detectors for detecting a γ-ray emitted from said examinee and an integrated circuit for processing γ-ray detection signals outputted from each of said plurality of semiconductor radiation detectors, said unit substrates being arranged in a direction perpendicular to said longitudinal direction of said bed and around said bed,
• wherein said semiconductor radiation detectors are disposed on both sides of each of said unit substrates,
• wherein each of said semiconductor radiation detectors has a laminated structure comprising at least two layers, each layer including a layer of semiconductor material sandwiched with anode and cathode electrodes,
• said X-ray CT imaging apparatus has an X-ray source for emitting an X-ray to said examinee and a radiation detector for detecting an X-ray emitted from said X-ray source and passed through said examinee, and
• said bed is shared by said positron emission CT imaging apparatus and said X-ray CT imaging apparatus.