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arXiv 2101.09439physics.ins-detphysics.med-ph
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光子计数CT与硅探测器:儿科成像的可行性

Photon-counting CT with silicon detectors: feasibility for pediatric imaging

Moa Yveborg, Cheng Xu, Erik Fredenberg, Mats Danielsson

摘要:

由晶体硅制成的X射线探测器具有几个优点,包括低暗电流、快速电荷收集和高能量分辨率。然而,对于高能X射线,硅遭受其低原子序数的影响,这可能导致低检测效率,以及由于康普顿散射导致的低能量和空间分辨率。我们已经使用了蒙特卡洛模型,以调查的可行性,儿科CT与30至40毫米的硅使用的X射线光谱范围从80至140 kVp的探测器。如果噪声阈值可以设置得较低,则在80 kVp下的检测效率为0.74。散射的光子被有效地阻止了探测器单元之间的薄金属屏蔽,并在探测器中的康普顿散射可以很好地从80 kVp的光吸收分离。因此,探测器在低加速电压下是可行的,这也适用于儿科成像。我们的结论是,硅探测器可能是一种替代其他设计这种特殊情况下。

英文摘要:

X-ray detectors made of crystalline silicon have several advantages including low dark currents, fast charge collection and high energy resolution. For high-energy x-rays, however, silicon suffers from its low atomic number, which might result in low detection efficiency, as well as low energy and spatial resolution due to Compton scattering. We have used a monte-carlo model to investigate the feasibility of a detector for pediatric CT with 30 to 40 mm of silicon using x-ray spectra ranging from 80 to 140 kVp. A detection efficiency of 0.74 was found at 80 kVp, provided the noise threshold could be set low. Scattered photons were efficiently blocked by a thin metal shielding between the detector units, and Compton scattering in the detector could be well separated from photo absorption at 80 kVp. Hence, the detector is feasible at low acceleration voltages, which is also suitable for pediatric imaging. We conclude that silicon detectors may be an alternative to other designs for this special case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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