旋转调制器Gamma-Ray成像器的特征计数率分布
Characteristic Count Rate Profiles for a Rotating Modulator Gamma-Ray Imager
摘要：
旋转调制是一种用于在硬X射线和软伽马射线能量带中间接成像的技术，其可以提供优于高能量下的编码孔径成像的优点。旋转调制器（RM）由通常等距间隔开的共面平行板条的单个掩模组成，所述掩模悬挂在圆形非成像检测器阵列上方。掩模旋转，在时间上调制目标场景的传输图像。每个检测器的测量的计数率分布以掩模旋转周期为模进行折叠，并且使用预定的特征调制分布来重建目标场景。使用蒙特卡罗模拟来导出特征计数率曲线是准确的，但计算昂贵;分析方法由于其计算速度而优选。我们提出的标准和一个新的先进的特性公式描述的调制模式的RM;后者是一个更强大的描述的仪器响应开发的一部分，宽视场高分辨率望远镜的伽玛射线天文学的设计。我们研究了一个近似的先进的公式，以简化重建软件，提高计算速度，并评论的固有局限性和实用性的方法。最后，我们显示比较标准的公式，并证明图像重建从蒙特卡罗模拟。
英文摘要：
Rotating modulation is a technique for indirect imaging in the hard x-ray and soft gamma-ray energy bands, which may offer an advantage over coded aperture imaging at high energies. A rotating modulator (RM) consists of a single mask of co-planar parallel slats typically spaced equidistance apart, suspended above an array of circular non-imaging detectors. The mask rotates, temporally modulating the transmitted image of the object scene. The measured count rate profiles of each detector are folded modulo the mask rotational period, and the object scene is reconstructed using pre-determined characteristic modulation profiles. The use of Monte Carlo simulation to derive the characteristic count rate profiles is accurate but computationally expensive; an analytic approach is preferred for its speed of computation. We present both the standard and a new advanced characteristic formula describing the modulation pattern of the RM; the latter is a more robust description of the instrument response developed as part of the design of a wide-field high-resolution telescope for gamma-ray astronomy. We examine an approximation to the advanced formula to simplify reconstruction software and increase computational speed, and comment on both the inherent limitations and usefulness of the approach. Finally, we show comparisons to the standard formula and demonstrate image reconstructions from Monte Carlo simulations.
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