Fitting method for scintillation pulse digitized signals

Abstract

The present invention provides a fitting method for scintillation pulse digitized signals. The method comprises the steps of selecting a scintillation pulse prior model as a double-exponential model; selecting sampling points for classical pulses in a scintillation pulse database, wherein the sampling points are composed of eight voltage threshold sequences and eight time point sequences; translating the curve of the double-exponential model in the time dimension to obtain a time array; setting four initial default parameters of a target function to be 1 and storing as an initial parameter array; inputting the time array, a scintillation target function and the like into a Levenberg Marquardt Fitting function, and fitting to obtain fitting parameters; sequentially repeating each scintillation pulse in the scintillation pulse database to complete the fitting process of all scintillation pulses; integrating the fitted target function to obtain the energy value of a k pulse; solving the equation and extracting the time and energy information of the pulse. According to the technical scheme of the invention, the obtained energy resolution is remarkably improved. Therefore, the information extraction accuracy and the information extraction stability are ensured at the same time while the processing efficiency can be improved.

Description

technical field [0001] The invention relates to the field of signal processing of medical equipment, and more particularly to a method for fitting digitized signals of scintillation pulses in the field of digital PET. Background technique [0002] Positron Emission Tomography (PET) captures the distribution of tracers labeled with positron nuclides in the human body by capturing the gamma photons emitted by the annihilation of positrons in the human body, and then obtains the organs Function, metabolism and other pathophysiological characteristics. The accuracy of obtaining energy, position and time information carried by γ photons directly affects the imaging performance of the system. Scintillation detectors are used to capture high-energy particles (such as γ and X particles) and measure the corresponding energy deposition information. Due to their high detection efficiency, fast time response and accurate information measurement, they are widely used in the fields of ra...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for fitting digital signals of scintillation pulses, thereby solving the problem that the digital pulse fitting method in the prior art cannot take into account efficiency, accuracy and stability

Images