Volume 29, Issue 3

Kinetic quantitation of dynamic positron emission tomography (PET) studies via compartmental modeling usually requires the time-course of the radio-tracer concentration in the arterial blood as an arterial input function (AIF). For human and animal imaging applications, significant practical difficulties are associated with direct arterial sampling and as a result there is substantial interest in ...

通过房室模型对动态正电子发射断层扫描（PET）研究进行动力学量化通常需要动脉血液中放射性示踪剂浓度的时间过程作为动脉输入函数（AIF）。对于人类和动物成像应用，直接动脉采样存在显著的实际困难，因此人们对该方法以外的替代方法有浓厚兴趣……

Cardiac computed tomography (CT) has been improved over past years, but it still needs improvement for higher temporal resolution in the cases of high or irregular cardiac rates. Given successful applications of dual-source cardiac CT scanners, triple-source cone-beam CT seems a promising mode for cardiac CT. In this paper, we propose two filtered-backprojection algorithms for triple-source helica...

心脏计算机断层扫描（CT）在过去几年中得到了改进，但在高或不规则心率的情况下，仍需要提高时间分辨率。鉴于双源心脏CT扫描仪的成功应用，三源锥束CT似乎是心脏CT的一种有前景的模式。在本文中，我们提出了两种用于三源螺旋锥束CT的滤波反投影算法。

An aim of magnetic resonance electrical impedance tomography (MREIT) is to visualize the internal current density and/or the conductivity of an imaging object. In MREIT, it is desirable to use just one component of the internal magnetic flux density vector $ {\bf B}=(B_{x},B_{y},B_{z})$ caused by the injected current, measured without rotating the object. We present a method of visualizing the axi...

磁共振电阻抗成像（MREIT）的目的是可视化成像对象的内部电流密度和/或电导率。在MREIT中，期望使用注入电流引起的内部磁通密度向量 $ {\bf B}=(B_{x},B_{y},B_{z})$ 的一个分量，且无需旋转物体即可测量。我们提出了一种可视化轴...的方法

In recent years, magnetic tracking systems, whose fundamental unit of measurement is a 5D transformation (three translational and two rotational degrees-of-freedom), have become much more popular. Two 5D sensors can be combined to obtain a 6D transformation similar to the ones provided by the point-based registration in optical tracking. However, estimates of the tool tip uncertainty, which we hav...

近年来，磁跟踪系统（其基本测量单位是5D变换，即三个平移和两个旋转自由度）变得非常流行。两个5D传感器可以组合以获得类似于光学跟踪中基于点配准提供的6D变换。然而，我们先前研究的工具尖端不确定度估计...

Image acquisition of magnetic resonance imaging (MRI) can be accelerated by using multiple receiving coils simultaneously. The problem of reconstructing an unaliased image from partially sampled ${\bf k}$-space data can be formulated as a large system of sparse linear equations. The ${\bf k}$-space sparse matrix (kSPA) algorithm proposes to solve the system of equations by finding a sparse approx...

磁共振成像（MRI）的图像采集可以通过同时使用多个接收线圈来加速。从部分采样的k空间数据中重建无混叠图像的问题可以表述为一个大稀疏线性方程组。k空间稀疏矩阵（kSPA）算法提出通过寻找稀疏近似解来求解方程组...

Provides a listing of current staff, committee members and society officers.

提供当前工作人员、委员会成员和学会官员的列表。

Presents the table of contents for this issue of the periodical.

介绍本期期刊的目录。

Provides notice of upcoming conference events of interest to practitioners and researchers.

提供即将召开的会议通知，对从业者和研究人员有参考价值。

Provides instructions and guidelines to prospective authors who wish to submit manuscripts.

为希望提交稿件的新作者提供说明和指南。