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arXiv 2107.01356physics.ins-detphysics.med-ph
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模块化全身扫描仪J-PET的NEMA特性模拟--一种经济型全身扫描仪PET

Simulating NEMA characteristics of the modular total-body J-PET scanner -- an economic total-body PET from plastic scintillators

Paweł Moskal, Paweł Kowalski, Roman Shopa, Lech Raczyński, Jakub Baran, Neha Chug, Catalina Curceanu, Eryk Czerwiński, Meysam Dadgar, Kamil Dulski, Aleksander G… 展开作者

Paweł Moskal, Paweł Kowalski, Roman Shopa, Lech Raczyński, Jakub Baran, Neha Chug, Catalina Curceanu, Eryk Czerwiński, Meysam Dadgar, Kamil Dulski, Aleksander Gajos, Beatrix Hiesmayr, Krzysztof Kacprzak, Łukasz Kapłon, Daria Kisielewska, Konrad Klimaszewski, Przemysław Kopka, Gregorz Korcyl, Nikodem Krawczyk, Wojciech Krzemień, Ewelina Kubicz, Szymon Niedźwiecki, Szymon Parzych, Juhi Raj, Sushil Sharma, Shivani Shivani, Ewa Stȩpień, Faranak Tayefi, Wojciech Wiślicki

摘要:

本研究的目的是估计的经济全身Jagiellonian-PET系统(TB-J-PET)的性能特征构造的塑料制冷剂。这些特性是根据NEMA NU-2-2018标准使用GATE软件包进行估算的。模拟探测器由24个模块组成,每个模块由32个塑料闪烁体条(每个闪烁体条具有6 mm × 30 mm的截面和140 cm或200 cm的长度)构成,所述塑料闪烁体条以规则的24边多边形的两层布置,所述多边形外接直径为78.6 cm的圆。对于轴向视场(AFOV)为200 cm的TB-J-PET,实现了3.7 mm(横向)和4.9 mm(轴向)的空间分辨率。在30 kBq/cc放射性浓度下,预期NECR峰值为630 kcps,中心灵敏度为38 cps/kBq。SF估计为36.2%。SF和空间分辨率的值与最先进的临床PET扫描仪和第一台全身断层扫描仪(uExplorer和PennPET)获得的值相当。相对于AFOV在16 cm至26 cm范围内的标准PET系统,TB-J-PET的特征在于NECR增加约4倍,全身灵敏度增加12.6至38倍。TB-J-PET的TOF分辨率预期为CRT=240 ps(FWHM)的水平。对于轴向视野(AFOV)为140 cm的TB-J-PET,使用对比度恢复系数(CRC)和背景变异性参数表示NEMA IEC体模重建图像的图像质量。TB-J-PET相对于当前商业PET系统的全身灵敏度和估计的NECR的增加使得TB-J-PET成为全身PET扫描仪的广泛临床应用的有前景的具有成本效益的解决方案。

英文摘要:

The purpose of the presented research is estimation of the performance characteristics of the economic Total-Body Jagiellonian-PET system (TB-J-PET) constructed from plastic scintillators. The characteristics are estimated according to the NEMA NU-2-2018 standards utilizing the GATE package. The simulated detector consists of 24 modules, each built out of 32 plastic scintillator strips (each with cross section of 6 mm times 30 mm and length of 140 cm or 200 cm) arranged in two layers in regular 24-sided polygon circumscribing a circle with the diameter of 78.6 cm. For the TB-J-PET with an axial field-of-view (AFOV) of 200 cm, a spatial resolutions of 3.7 mm (transversal) and 4.9 mm (axial) are achieved. The NECR peak of 630 kcps is expected at 30 kBq/cc activity concentration and the sensitivity at the center amounts to 38 cps/kBq. The SF is estimated to 36.2 %. The values of SF and spatial resolution are comparable to those obtained for the state-of-the-art clinical PET scanners and the first total-body tomographs: uExplorer and PennPET. With respect to the standard PET systems with AFOV in the range from 16 cm to 26 cm, the TB-J-PET is characterized by an increase in NECR approximately by factor of 4 and by the increase of the whole-body sensitivity by factor of 12.6 to 38. The TOF resolution for the TB-J-PET is expected to be at the level of CRT=240 ps (FWHM). For the TB-J-PET with an axial field-of-view (AFOV) of 140 cm, an image quality of the reconstructed images of a NEMA IEC phantom was presented with a contrast recovery coefficient (CRC) and a background variability parameters. The increase of the whole-body sensitivity and NECR estimated for the TB-J-PET with respect to current commercial PET systems makes the TB-J-PET a promising cost-effective solution for the broad clinical applications of total-body PET scanners.

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