Mode body used for PET imaging system detector normalization correction

Abstract

The invention relates to a mode body used for PET imaging system detector normalization correction, and relates to the technical field of medical imaging. The mode body comprises a cylinder, the cylinder and a PET detector are coaxial in the axial direction, spiral grooves are formed in the outer surface of the cylinder in an equal-distance mode, guide pipes which are wound outside the cylinder in an equal-distance mode are arranged in each spiral groove, and opening ends are arranged at the two ends of each guide pipe respectively. According to the mode body, on one hand, an even stick source which is expensive does not need to be customized; on the other hand, the mechanical design requirement is simplified, and the requirement that all detection units are evenly irradiated in normalization correction is easily met.

Description

technical field [0001] The invention relates to the technical field of medical imaging, in particular to a phantom design that can be used for detector normalization correction of a positron emission computed tomography imaging system. Background technique [0002] In the field of nuclear medicine, PET (Positron Emission Tomography) is an inspection imaging technique that can non-invasively display the function and metabolism of human organs. In clinical practice, this technique can be used to guide cancer treatment. The principle is: the malignant tumor tissue in the patient's body has a strong metabolism, and the metabolites (such as glucose, protein, etc.) accumulate more. We can use radionuclides (such as 18 F. 11 C, etc.) Mark the metabolites, and then use the PET imaging system to accurately display the aggregation and activity of metabolites through three-dimensional imaging technology to reflect the activities of life metabolism. Thus, PET provides a direct and ti...

AI Technical Summary

Problems solved by technology

[0005] In order to ensure the correctness of the normalization correction before leaving the factory, it is necessary to ensure that all detection units in the PET system can be uniformly irradiated for a long time in the test, which brings great difficulties to the processing and mechanical design of the rod source:

[0006] 1. The radioactivity of the solid rod source needs to be very uniform, which makes the production cost very high

[0007] 2. In order to cover the axial field of view of the detector, the length of the rod source usually needs to exceed 20cm, which further increases the difficulty of fabrication

[0008] 3. Since the attenuation rod source needs to be customized repeatedly, this further increases the cost

[0009] 4. The solid rod source has a long decay time (half-life of 271 days), and the preservation needs to strictly abide by the shielding principle to prevent radioactive contamination, which increases the complexity of the preservation process

[0011] 6. If the length of the rod source is not long enough to cover the axial field of view of PET, the rod source needs to be stepped along the axial direction of the detector in the normalization correction test, which further increases the complexity of the mechanical design

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