Detector timing device and detector

Abstract

The invention discloses a detector timing device and a detector. The detector timing device comprises a pre-amplifier, a constant ratio circuit and an FPGA (Field Programmable Gate Array), wherein thepre-amplifier is used for converting output signals of the detector into in-phase differential signals and reverse-phase differential signals; the constant ratio circuit is used for maintaining a constant ratio between the in-phase differential signals and the reverse-phase differential signals and sending the in-phase differential signals and revere-phase differential signals with the ratio being constant to a pair of I / O ports of the FPGA; and the FPGA is used for performing zero crossing triggering on the in-phase differential signals and the reverse-phase differential signals with the ratio being constant to obtain timing logic pulse signals, and measuring the arrival time of the timing logic pulse signals to obtain time information. The detector timing device adopts the constant ratio principle, not only improves the working efficiency, but also improves the timing accuracy of the detector. Therefore, the detector timing device realizes the balance between the timing performanceand the circuit scale of a front-end electronic circuit of the digital detector.

Description

technical field

[0001] The invention relates to the technical field of medical equipment, in particular to a detector timing device and a detector. Background technique

[0002] Positron Emission Tomography (PET) is a nuclear physics detection technique that utilizes positron decay nuclide radiopharmaceutical imaging. By detecting the 511keV energy γ-photon pairs emitted in opposite directions produced by the annihilation of electron-positrons (Annihilation), the annihilation events are reconstructed according to the line statistical projection distribution.

[0003] Subsequently, the time-of-flight method (Time-Of-Flight, TOF) began to be applied to PET, which measures the time difference between the gamma photon pairs reaching the detector, and estimates the position of the annihilation event on the coincidence line according to the speed of light.

[0004] The timing circuit is the basic unit used to detect time information in the front-end electronic circuit of the PET ...

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