Development of multi-pixel x-ray source using oxide-coated cathodes
Development of multi-pixel x-ray source using oxide-coated cathodes
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DOI：
10.1088/1361-6560/aa5d60
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发表时间：
2017-07-07
影响因子：
3.5
通讯作者：
Zhang, Tiezhi
中科院分区：
文献类型：
--
作者：
Kandlakunta, Praneeth;Pham, Richard;Zhang, Tiezhi
多像素X射线源促进成像模态的新设计，其可导致更快的成像速度、改进的图像质量和更紧凑的几何形状。我们正在开发一种基于氧化物涂层阴极的高亮度多像素电子发射X射线（MPTEX）源。氧化物阴极具有高发射效率，因此，与传统钨丝相比，在低温下产生高发射电流密度。间接加热的微矩形氧化物阴极是使用碳酸盐开发的，碳酸盐在活化后转化为钡、锶和钙的半导体氧化物。每个阴极在细长的固定阳极上产生焦斑。X射线束开和关控制由源开关电子设备执行，该源开关电子设备向阴极发射器提供偏置电压。在本文中，我们报告的氧化物涂层的阴极和MPTEX源的初始性能。
Multiple pixel x-ray sources facilitate new designs of imaging modalities that may result in faster imaging speed, improved image quality, and more compact geometry. We are developing a high-brightness multiple-pixel thermionic emission x-ray (MPTEX) source based on oxide-coated cathodes. Oxide cathodes have high emission efficiency and, thereby, produce high emission current density at low temperature when compared to traditional tungsten filaments. Indirectly heated micro-rectangular oxide cathodes were developed using carbonates, which were converted to semiconductor oxides of barium, strontium, and calcium after activation. Each cathode produces a focal spot on an elongated fixed anode. The x-ray beam ON and OFF control is performed by source-switching electronics, which supplies bias voltage to the cathode emitters. In this paper, we report the initial performance of the oxide-coated cathodes and the MPTEX source.