Detective Quantum Efficiency of a CsI-CMOS X-ray Detector for Breast Tomosynthesis Operating in High Dynamic Range and High Sensitivity Modes.

Detective Quantum Efficiency of a CsI-CMOS X-ray Detector for Breast Tomosynthesis Operating in High Dynamic Range and High Sensitivity Modes.
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CSI-CMOS X射线探测器的侦探量子效率用于高动态范围和高灵敏度模式下运行的乳房合成。

DOI:
10.1007/978-3-642-31271-7_11
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发表时间:
2012-07
期刊:
Breast imaging : 11th International Workshop, IWDM 2012, Philadelphia, PA, USA, July 8-11, 2012 : proceedings. International Workshop on Breast Imaging (11th : 2012 : Philadelphia, Pa.)
影响因子:
--
通讯作者:
Williams MB
Williams MB
中科院分区:
其他
文献类型:
--
作者:
Patel T;Klanian K;Gong Z;Williams MB

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CsI-CMOS X 射线探测器的空间频率相关探测量子效率 (DQE) 在两种操作模式下进行测量:高动态范围 (HDR) 模式和高灵敏度 (HS) 模式。 DQE 计算使用 IEC-62220-1-2 标准进行。对于探测器入口空气比释动值介于 ~7 µGy 和 60 µGy 之间,DQE 在 HDR 模式或 HS 模式下相似,低频时值为 ~0.7,奈奎斯特频率 fN = 6.7 mm−1 时值为 ~ 0.15 – 0.20。在 HDR 模式下,当 Ka 值介于 ~7 µGy 和 119 µGy 之间时,DQE 几乎保持恒定,但当 Ka 水平低于 ~ 7 µGy 时,DQE 会降低。在 HS 模式下,DQE 在 1.7 µGy 和 60 µGy 之间测试的整个入口空气比释动范围内近似恒定,但高于 ~75 µGy 的比释动值会产生硬饱和。 HS 模式下的量子限制操作,入口比释动小至 1.7 µGy,使得可以使用大量低剂量视图来改进角度采样并减少采集时间。
The spatial frequency dependent detective quantum efficiency (DQE) of a CsI-CMOS x-ray detector was measured in two operating modes: a high dynamic range (HDR) mode and a high sensitivity (HS) mode. DQE calculations were performed using the IEC-62220-1-2 Standard. For detector entrance air kerma values between ~7 µGy and 60 µGy the DQE is similar in either HDR mode or HS mode, with a value of ~0.7 at low frequency and ~ 0.15 – 0.20 at the Nyquist frequency fN = 6.7 mm−1. In HDR mode the DQE remains virtually constant for operation with Ka values between ~7 µGy and 119 µGy but decreases for Ka levels below ~ 7 µGy. In HS mode the DQE is approximately constant over the full range of entrance air kerma tested between 1.7 µGy and 60 µGy but kerma values above ~75 µGy produce hard saturation. Quantum limited operation in HS mode for entrance kerma as small as 1.7 µGy makes it possible to use a large number of low dose views to improve angular sampling and decrease acquisition time.