Study of a high-resolution, 3D positioning cadmium zinc telluride detector for PET.

Study of a high-resolution, 3D positioning cadmium zinc telluride detector for PET.
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DOI:
10.1088/0031-9155/56/6/004
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发表时间:
2011-03-21
影响因子:
3.5
通讯作者:
Levin CS
Levin CS
中科院分区:
工程技术2区
文献类型:
--
作者:
Gu Y;Matteson JL;Skelton RT;Deal AC;Stephan EA;Duttweiler F;Gasaway TM;Levin CS

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本文研究了1 mm分辨率碲锌镉(CZT)探测器的性能,用于正电子发射断层扫描(PET)能够定位单个511 keV光子相互作用的3-D坐标。该探测器由40 mm × 40 mm × 5 mm单片CZT晶体组成,采用了一种新型的交叉条带读出,并带有穿插的转向电极,以获得高的空间和能量分辨率。该研究发现,在511 keV下,大部分探测器体积的单阳极FWHM能量分辨率为3.06±0.39%。通过适当屏蔽前端电子设备,预计分辨率会有所提高。使用准直光束进行的测量确定了转向电极在促进跨阳极的增强电荷收集方面的功效,以及在与电极平面正交的方向上的0.44±0.07 mm的空间分辨率。最后,基于符合电子准直的测量产生了具有0.78±0.10 mm FWHM的点扩散函数,证明了横向于阳极的1 mm空间分辨率能力-正如从1 mm阳极间距所预期的那样。这些研究结果表明,基于CZT的探测器概念具有优异的性能,并显示出高分辨率PET系统的巨大潜力。
This paper investigates the performance of 1 mm resolution Cadmium Zinc Telluride (CZT) detectors for positron emission tomography (PET) capable of positioning the 3-D coordinates of individual 511 keV photon interactions. The detectors comprise 40 mm × 40 mm × 5 mm monolithic CZT crystals that employ a novel cross-strip readout with interspersed steering electrodes to obtain high spatial and energy resolution. The study found a single anode FWHM energy resolution of 3.06±0.39% at 511 keV throughout most the detector volume. Improved resolution is expected with properly shielded front-end electronics. Measurements made using a collimated beam established the efficacy of the steering electrodes in facilitating enhanced charge collection across anodes, as well as a spatial resolution of 0.44±0.07 mm in the direction orthogonal to the electrode planes. Finally, measurements based on coincidence electronic collimation yielded a point spread function with 0.78±0.10 mm FWHM, demonstrating 1 mm spatial resolution capability transverse to the anodes – as expected from the 1 mm anode pitch. These findings indicate that the CZT-based detector concept has excellent performance and shows great promise for a high-resolution PET system.
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