Positron imaging method and system of dual-readout PET detector

Abstract

The invention discloses a positron imaging method and system of a dual-readout PET detector. According to the system, photoelectric devices are arranged at two ends of crystal bar for coupling and areused for acquiring optical signal data in the crystal to carry out scintillation pulse data coupling; measured amplitude height of the pulse and arrival time of the pulse in the photoelectric devicesare recorded; and a difference value of the pulse arrival time and the amplitude height of the pulse are calculated and the position of the deposition energy of the gamma photon in the crystal is estimated. In addition, the method comprises the following steps: digitalizing a scintillation pulse coupling signal acquired by a photoelectric detector through an analog-to-digital converter; calculating the position of a photon conversion interaction depth according to the ratio of signal amplitudes at two ends of the detector; and performing interaction effect depth information reconstruction according to the energy, time and position information of the obtained signal. According to the invention, the action depth of the photon in the crystal is accurately located and action depth informationis obtained; parallax error correction is carried out; the interaction depth effect is effectively reduced; and the PET imaging effect is improved.

Description

technical field [0001] The invention relates to the fields of radiation detection and digital imaging, in particular to a dual-readout PET detector positron imaging method and system. Background technique [0002] In positron emission tomography (hereinafter referred to as PET), computed tomography (hereinafter referred to as CT), single photon emission tomography (hereinafter referred to as SPECT) and magnetic resonance imaging (Magnetic Resonance Imaging) , hereinafter referred to as MRI) and other medical imaging fields, there are mainly two working methods of detectors: one is to convert high-energy photons into lower-energy visible light photons or ultraviolet photons through scintillators, and then convert visible light photons or ultraviolet photons It is converted into electrical signals through photoelectric devices; the other is to directly convert high-energy photons into electrical signals through semiconductor materials such as cadmium zinc telluride (hereinafte...

AI Technical Summary

Problems solved by technology

If the incident gamma assumptions intersect the crystal from a non-perpendicular direction to the crystal, if only the two-dimensional spatial positions are calculated for such absorption events, then due to the parallax effect, the depth of action of those gamma assumption positions within the crystal will lead to the measured The additional uncertainty in the position of action of

[0010] There are some inherent limitations in the implementation of PET imaging detectors, and these inherent limitations limit the performance of PET. The DOI effect has a great impact on the performance of PET and the effect of imaging.

Images