PET/CT performance detection die body, and image evaluation method thereof

Abstract

The invention relates to a PET / CT performance detection die body and an image evaluation method thereof. The PET / CT performance detection die body is composed of a PET image quality detection module and a CT performance detection module, wherein the two modules are connected into a whole, and PET performance and CT performance can be detected at a time. Hollow spheres used in the PET / CT performance detection die body comprise six hollow spheres distributed according to standard regulations, two hollow spheres with diameters of 4 mm and two hollow spheres with diameters of 7 mm, so the PET image quality of tiny lesions can be detected, and spatial resolution can be qualitatively evaluated. The upper end and the lower end of a lung plug-in are clamped in a top cover groove of the PET image quality detection module and a bottom cover groove of the PET image quality detection module, so the problem that the die body is difficult to install due to the fact that the lung plug-in floats in the die body since the density of the lung plug-in is smaller than the density of water is avoided, solution dispensing is easy and short in time, radiopharmaceutical activity loss is reduced, and ionizing radiation to experimenters is reduced. The image evaluation method can perform automatic image quality analysis and processing on phantom image data acquired by PET / CT equipment of different brands and models, and is also suitable for the NEMA IEC Body die body; and off-line analysis can be realized, and the machine hour of the PET / CT equipment is not occupied.

Description

Technical field [0001] The invention relates to a testing instrument in the medical field, in particular to a PET / CT performance testing phantom and an image evaluation method Background technique [0002] With the widespread application of PET / CT, people have gradually increased the performance requirements of PET / CT, and the research of PET / CT performance detection technology has received extensive attention. [0003] PET image quality is presented as a terminal of the performance of PET / CT, and is an important performance parameter of PET / CT. CT equipment is mainly used to describe the anatomical characteristics of the size, location, and shape of the lesion; however, the CT value of many diseased tissues is less different from that of normal tissues. Therefore, the low contrast resolution of CT is also very important for PET / CT equipment. . The generation of the PET / CT fusion image is obtained by fusing the two image registrations independently generated by the PET equipment ...

AI Technical Summary

Problems solved by technology

However, the minimum size of the sphere used to detect image quality parameters in the NEMAIEC Body phantom is 10mm, which cannot meet the image quality detection requirements of tiny lesions

[0007] 2. Existing detection phantoms and methods cannot meet the CT low-contrast resolution detection requirements of PET / CT equipment:

[0008] ①. NEMA IEC Body phantom cannot detect CT low-contrast resolution, and Catphan phantom is required (such as figure 2 Shown) detect this parameter

[0009] ②. The Catphan phantom itself is relatively large. If it is scanned simultaneously with the NEMA IEC Body phantom, the PET image will be scattered. Therefore, the NEMA IEC Body phantom and the Catphan phantom cannot be scanned at the same time. That is to say, the detection of PET image quality , Scatter correction and attenuation correction accuracy detection, and PET / CT registration accuracy detection cannot be carried out simultaneously with CT low-contrast resolution detection at one time; Factors such as position differences and repeatability errors increase the detection time and experimental errors

[0013] ①. The PET / CT equipment produced by some manufacturers is equipped with image quality evaluation function, which will analyze the image according to the above method, but usually only applies to the data collected by the same brand and model of PET / CT equipment, and needs to be equipped with PET / CT It is carried out on the operating system; for the PET / CT equipment used in the hospital, this process takes a long time, and the long-term occupation of the machine will seriously delay the clinical diagnosis

Due to design flaws in the NEMAI EC Body phantom, its lung inserts cannot be fixed in the lower bottom or top cover slots of the phantom, and the density of the lung inserts is much lower than that of water. It is easy to float on the surface of the solution and is difficult to install, which increases the time for dispensing and increases the dose of ionizing radiation received by experimenters

In addition, the half-life of the radionuclide in the FDG solution is short. If the dispensing time is too long and the activity of the drug does not meet the minimum activity requirements required by the phantom, the phantom needs to be reconfigured.

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