A method for measuring the noise equivalent count rate of a dual-plate pet system

Abstract

The invention discloses a method for measuring the noise equivalent counts rate of a double-flat-panel PET system. The method comprises the following steps: (1) defining coordinate space, and determining the axial direction of the double-flat-panel PET system; (2) placing a selected die body in the double-flat-panel PET system, carrying out data collection, organizing the collected matched data into the form of a column diagram, and recording the duration time of collection, wherein the axial direction of the die body is consistent with the axial direction of the system; (3) reorganizing the data of each axial inclined layer in the column diagram to the corresponding single-layer column diagram vertical to the axial direction; (4) according to the stray coincidence and scatter coincidencecounts under each projection angle of each layer, calculating the stray coincidence and scatter coincidence counts of each layer; (5) according to the total coincidence count rate and the stray coincidence and scatter coincidence count rate of each layer, calculating the real coincidence count rate of each layer of the column diagram; and (6) according to the real coincidence count rate of each layer, acquiring the noise equivalent counts rate of the PET system. The method is applied to the double-flat-panel PET system.

Description

technical field [0001] The invention relates to a method for measuring and calculating the noise equivalent counting rate of a double-plate PET system, belonging to the technical field of PET imaging. Background technique [0002] Positron Emission Tomography (PET) is an advanced nuclear medical imaging technology that can detect physiological and biochemical information such as blood flow, metabolism, and receptor molecular binding of biological tissues at the molecular level. It is a modern high-quality medical imaging technology. An important part of imaging technology. [0003] At present, most PETs have a circular or regular polygonal structure, which has the advantage of being able to obtain relatively complete three-dimensional data, but the imaging space is relatively closed, and the imaging method is relatively fixed and limited. In recent years, more and more PET imaging systems with different structures have appeared, especially the compact double-plate PET, whic...

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Problems solved by technology

[0007] After researching the prior art solutions, the inventors found that the prior art solutions are only applicable to circular or polygonal PET systems, and there are the following problems when applied to a dual-plate PET imaging system: (1) In a dual-plate PET system, it is not The data collected from all projection angles are complete data, not all radial offset data are available under every projection angle, and the projection lines under some projection angles do not pass through the line source, which leads to the The pixel position of the maximum value is not the center position of the line source response; (2) Since not the pixel position of the maximum value under each projection angle in the double-plate system is the center position of the line source response at this angle, it cannot be based on The center position is used to move the projection data; (3) Since the data cannot be moved, a total projection after the center position is aligned cannot be generated, and the system total event rate and noise equivalent event rate cannot be calculated according to the total projection

[0008] In summary, in the prior art, there is no method for measuring and calculating the noise equivalent count rate for double-plate PET

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