Performance of a novel 43-cm x 43-cm flat-panel detector with CsI:Tl scintillator
Performance of a novel 43-cm x 43-cm flat-panel detector with CsI:Tl scintillator
复制标题
具有 CsI:Tl 闪烁体的新型 43 厘米 x 43 厘米平板探测器的性能
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Yoshihiro Ogawa
中科院分区：
文献类型：
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作者：
T. Yamazaki;T. Tamura;M. Nokita;S. Okada;Shinsuke Hayashida;Yoshihiro Ogawa
我们研制了一种新型的带有CsI:Tl闪烁体的平板探测器。该探测器由一块43cm × 43cm的非晶硅薄膜晶体管（TFT）阵列和具有160μm像素间距的MIS（金属-绝缘体-半导体）光电转换器组成，并涂有针状晶体CsI:Tl闪烁体。利用创新的传感器技术，完全改变了当前探测器的信号链。新型探测器和电流探测器被配备到一个数字射线照相系统，允许定量和比较研究。结果表明，该探测器具有覆盖射线照相曝光范围的线性响应。它具有适度的调制传递函数（MTF），足以满足射线成像任务，并有效地抑制混叠。探测量子效率（DQE）几乎是现有探测器的两倍。在1/2x剂量水平下暴露的对比细节幻影的结果与电流检测器在1x剂量水平下的结果相当。这些结果表明，由于更高的DQE和创新的传感器技术，新型检测器的性能优于现有检测器，并有望将患者剂量减少一半。
We have developed a novel flat-panel detector with CsI:Tl scintillator. The detector consists of a single piece 43cm x 43cm amorphous silicon thin-film transistor (TFT) array with MIS (metal-insulator-semiconductor) photoelectric converter having a pixel pitch of 160μm coated with a needle-like crystal CsI:Tl scintillator. Signal chain was totally revised from current detector utilizing an innovative sensor technology. The novel detector and current detector were equipped to a digital radiography system allowing a quantitative and comparative study. Results show that the novel detector has a linear response covering the radiographic exposure range. It has a moderate modulation transfer function (MTF) sufficient to the radiography tasks and effective to suppress the aliasing. The detective quantum efficiency (DQE) was almost twice than the current detector. The result of contrast-detail phantom exposed with a 1/2x dose level is equivalent to that of current detector with a 1x dose level. These results show that performance of novel detector is superior to and expected to reduce the patient dose in half than current detector due to higher DQE and innovative sensor technology.