论文标题
具有二维相灵敏度的三型X射线CT苍蝇的环形螺旋形抽样
Cycloidal-spiral sampling for three-modal x-ray CT flyscans with two-dimensional phase sensitivity
论文作者
论文摘要
我们提供了具有二维相灵敏度的三型X射线计算机断层扫描（CT）的FlyScan兼容采集方案。使用“光束跟踪”设置来证明我们的方法，可以通过单个框架测量样品的衰减，相位（折射）和散射特性，从而提供三个互补的对比通道。到目前为止，此类设置要求以每个旋转角度将样品以足够的速率踏上样品信号，以防止分辨率损失，各向异性分辨率和采样不足的人工制品。但是，对踏脚的需求需要进行一步实施，该实施受汽车开销的影响并增加了总扫描时间。相比之下，我们所提出的方案，通过该方案，样品的连续水平和垂直翻译与旋转集成在一起（导致“环形刺激性”轨迹）与连续扫描完全兼容（FlyScans）。这会大大减少扫描时间，同时在很大程度上保留了图像质量和各向同性分辨率。
We present a flyscan compatible acquisition scheme for three-modal X-Ray Computed Tomography (CT) with two-dimensional phase sensitivity. Our approach is demonstrated using a "beam tracking" setup, through which a sample's attenuation, phase (refraction) and scattering properties can be measured from a single frame, providing three complementary contrast channels. Up to now, such setups required the sample to be stepped at each rotation angle to sample signals at an adequate rate, to prevent resolution losses, anisotropic resolution, and under-sampling artefacts. However, the need for stepping necessitated a step-and-shoot implementation, which is affected by motors overheads and increases the total scan time. By contrast, our proposed scheme, by which continuous horizontal and vertical translations of the sample are integrated with its rotation (leading to a "cycloidal-spiral" trajectory), is fully compatible with continuous scanning (flyscans). This leads to greatly reduced scan times while largely preserving image quality and isotropic resolution.
