Method and device for acquiring energy spectrum, and device for setting energy window

Abstract

The invention provides a method and device for acquiring an energy spectrum and a device for setting an energy window. A voltage comparator is in communication connection with a detector module and receives a flicker pulse signal sent by the detector module; a DAC (digital to analog converter) is in communication connection with the voltage comparator and transmits threshold information to the voltage comparator; the voltage comparator sends a flicker pulse signal that meets the threshold information to a counter; a control and storage unit is coupled to the counter and stores and records thecount information, and the control and storage unit is also connected to the DAC and stores and records the threshold information. The method comprises the following steps of: setting a threshold of the DAC and resetting the counter; using the counter to record the pulse number of flicker pulses whose amplitude exceeds the threshold within a T time period; setting the threshold of the DAC again, resetting the counter, and then recording the pulse number of flicker pulses whose amplitude exceeds the threshold within the T time period, and repeating the operation until the threshold is zero. Themethod and device for acquiring the energy spectrum and the device for setting the energy window can effectively reduce the cost and complexity of systems such as PET and SPET, and reduce the system's demand for computing resources and time.

Description

technical field [0001] The invention relates to the fields of radiation detection and digital imaging, and more particularly relates to a method and device for obtaining an energy spectrum and a device for setting an energy window. Background technique [0002] In nuclear medical imaging equipment such as positron emission tomography (PET) and single-photon emission computed tomography (SPECT), it is necessary to measure the energy and magnitude information of incident gamma particles in order to identify Whether gamma particles undergo Compton scattering as they pass through an object. The energy of gamma particles cannot be directly measured. Usually, a scintillation detector is used to convert it into a corresponding electrical pulse signal, and the energy of gamma particles is obtained by measuring the amplitude (or integral value) of the electrical pulse signal. In this acquisition process, it is necessary to perform coefficient calibration on the amplitude (or integra...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method and device for obtaining energy spectrum and a device for setting energy window, so as to solve the problems of high cost and slow processing speed when using ADC to obtain energy spectrum and set energy window in the prior art

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