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首页> 外文会议>SPIE Medical Imaging Conference >Comparison of direct-conversion a-Se and CsI scintillator-based CMOS FFDM/DBT flat-panel detectors, using an anthropomorphic breast phantom with embedded microcalcification signals
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Comparison of direct-conversion a-Se and CsI scintillator-based CMOS FFDM/DBT flat-panel detectors, using an anthropomorphic breast phantom with embedded microcalcification signals

机译：使用具有嵌入式微钙化信号的拟人化乳房体模，对直接转换基于a-Se和CsI闪烁体的CMOS FFDM / DBT平板探测器进行比较

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Digital flat-panel detectors (FPD) used in x-ray breast imaging [full field digital mammography (FFDM) or digital breast tomosynthesis (DBT)] utilize semiconductor-based sensors, which directly convert incident x-ray photons into charge pulses, or scintillator-based sensors which, first, absorb x-rays and then re-radiate the energy in a form of optical light, which is subsequently collected by photodiodes. Direct conversion detectors lack the optical light stage and, hence, potentially allow for better spatial resolution, which can be beneficial for imaging of small signals, like microcalcifications. Some of the recent scintillator detectors use columnar CsI to contain optical photon dispersion, by using total internal reflection inside the columns. In this study we test two detectors, an amorphous Selenium (a-Se) direct-conversion FPD with a pixel size of 85 μm, integrated in a number of FFDM and DBT systems, and a new CsI columnar scintillator detector with a 49.5 μm pixel and CMOS active pixel readout technology. Detectors were evaluated, using 1) linear assessment methods, i.e. modulation transfer function (MTF), noise power spectrum (XPS). and detective quantum efficiency (DQE); 2) a human observer reader study in which microcalcification signals were detected in FFDM images of an anthropomorphic breast phantom.
机译：用于X射线乳腺成像[全场数字乳房X线照相术（FFDM）或数字乳腺断层合成（DBT）]的数字平板探测器（FPD）利用基于半导体的传感器，将入射的X射线光子直接转换为电荷脉冲，或者基于闪烁体的传感器，该传感器首先吸收X射线，然后以光的形式重新辐射能量，该能量随后由光电二极管收集。直接转换检测器缺少光学舞台，因此有可能获得更好的空间分辨率，这对于微信号如微钙化的成像可能是有益的。一些最近的闪烁体探测器通过利用柱内的全内反射，使用柱状CsI来包含光学光子色散。在这项研究中，我们测试了两个检测器，一个集成在多个FFDM和DBT系统中的像素尺寸为85μm的非晶硒（a-Se）直接转换FPD，以及一个新的像素为49.5μm的CsI柱状闪烁体检测器。和CMOS有源像素读出技术。使用1）线性评估方法（即调制传递函数（MTF），噪声功率谱（XPS））对检测器进行评估。和探测量子效率（DQE）; 2）一项人类观察者读者研究，其中在拟人化的乳房幻像的FFDM图像中检测到微钙化信号。

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