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首页> 外文会议>Physics of Medical Imaging pt.1 >An indirect flat-panel detector with avalanche gain for low dose x-ray imaging: SAPHIRE (Scintillator Avalanche Photoconductor with High Resolution Emitter readout)
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An indirect flat-panel detector with avalanche gain for low dose x-ray imaging: SAPHIRE (Scintillator Avalanche Photoconductor with High Resolution Emitter readout)

机译：一种用于低剂量X射线成像的具有雪崩增益的间接平板探测器：SAPPHIRE（具有高分辨率发射器读数的闪烁体雪崩光电导体）

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An indirect flat-imager with programmable avalanche gain and field emitter array (FEA) readout is being investigated for low-dose x-ray imaging with high resolution. It is made by optically coupling a structured x-ray scintillator CsI (T1) to an amorphous selenium (a-Se) avalanche photoconductor called HARP (high-gain avalanche rushing photoconductor). The charge image created by HARP is read out by electron beams generated by the FEA. The proposed detector is called SAPHIRE (Scintillator Avalanche Photoconductor with HIgh Resolution Emitter readout). The avalanche gain of HARP depends on both a-Se thickness and applied electric field E_(se)- At E_(se) of > 80 V/um, the avalanche gain can enhance the signal at low dose (e.g. fluoroscopy) and make the detector x-ray quantum noise limited down to a single x-ray photon. At high exposure (e.g. radiography), the avalanche gain can be turned off by decreasing E_(se) to < 70 V/μm. In this paper the imaging characteristics of the FEA readout method, including the spatial resolution and noise, were investigated experimentally using a prototype optical HARP-FEA image sensor. The potential x-ray imaging performance of SAPHIRE, especially the aspect of programmable gain to ensure wide dynamic range and x-ray quantum noise limited performance at the lowest exposure in fluoroscopy, was investigated.
机译：对于具有高分辨率的低剂量X射线成像，正在研究具有可编程雪崩增益和场发射器阵列（FEA）读数的间接平面成像仪。它是通过将结构化的X射线闪烁体CsI（T1）与称为HARP（高增益雪崩冲积光电导体）的非晶硒（a-Se）雪崩光电导体光学耦合制成的。由HARP产生的电荷图像被FEA产生的电子束读出。提出的检测器称为SAPHIRE（具有高分辨发射器读数的闪烁体雪崩光电导体）。 HARP的雪崩增益取决于a-Se厚度和施加的电场E_（se）-在E_（se）> 80 V / um时，雪崩增益可以在低剂量下增强信号（例如，荧光检查），并使探测器的X射线量子噪声仅限于单个X射线光子。在高曝光（例如射线照相）下，可以通过将E_（se）降低至<70 V /μm来关闭雪崩增益。本文使用原型光学HARP-FEA图像传感器，对FEA读出方法的成像特性（包括空间分辨率和噪声）进行了实验研究。研究了SAPHIRE的潜在X射线成像性能，特别是在荧光检查中以最低的曝光量确保宽动态范围和X射线量子噪声限制性能的可编程增益方面。

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