Nuclear medicine diagnostic apparatus

A nuclear medicine diagnostic apparatus comprising:

• a plurality of detector units configured to detect gamma rays, each of the detector units including
• detection circuitry configured to detect an analog signal based on a result of detecting the gamma rays,
• generation circuitry configured to generate a clock signal, and
• first production circuitry configured to produce time information by measuring a time over which an intensity of the analog signal detected by the detection circuitry exceeds a predetermined threshold and converting the time into a digital signal on the basis of the clock signal generated by the generation circuitry, wherein
• the plurality of detector units includes a first detector unit and a second detector unit different from the first detector unit, the first detector unit including a first generation circuitry configured to generate a first clock signal, the second detector unit including a second generation circuitry configured to generate a second clock signal, and the generation circuitry comprising the first and second generation circuitry, and
• the nuclear medicine diagnostic apparatus further includes:
• first acquisition circuitry configured to acquire, on the basis of a synchronization signal generated by synchronization signal generation circuitry, first time information produced by the first production circuitry of the first detector unit, on the basis of the first clock signal;
• second acquisition circuitry configured to acquire, on the basis of the synchronization signal, second time information produced by the first production circuitry of the second detector unit on the basis of the second clock signal;
• and
• processing circuitry configured to correct an offset of the time information between the first detector unit and the second detector unit on the basis of the first time information and the second time information.