论文标题
使用连续旋转的FFL的MPI基于ra的图像重建
Radon-based Image Reconstruction for MPI using a continuously rotating FFL
论文作者
论文摘要
磁性粒子成像是一种相对较新的基于示踪剂的医学成像技术，利用磁性纳米颗粒对变化的磁场的非线性磁化响应。如果数据是通过使用无场线生成的，则采样几何形状类似于计算机断层扫描中的几何形状。实际上，对于仅在测量之间旋转的理想无场线，可以证明信号方程可以用粒子浓度的rad radton转换为卷积。在这项工作中，我们考虑了连续旋转的无场线，并相应地扩展了正向操作员。我们获得了与rad rad数据的关系的类似结果，但有两个添加术语是由正向模型中的额外时间依赖性产生的。我们通过总变异正规化共同重建粒子浓度和相应的ra数据，从而为合成数据带来了令人鼓舞的结果。
Magnetic particle imaging is a relatively new tracer-based medical imaging technique exploiting the non-linear magnetization response of magnetic nanoparticles to changing magnetic fields. If the data are generated by using a field-free line, the sampling geometry resembles the one in computerized tomography. Indeed, for an ideal field-free line rotating only in between measurements it was shown that the signal equation can be written as a convolution with the Radon transform of the particle concentration. In this work, we regard a continuously rotating field-free line and extend the forward operator accordingly. We obtain a similar result for the relation to the Radon data but with two additive terms resulting from the additional time-dependencies in the forward model. We jointly reconstruct particle concentration and corresponding Radon data by means of total variation regularization yielding promising results for synthetic data.
