Evaluation of a 3D reconstruction algorithm for multi-slice PET scanners.
Evaluation of a 3D reconstruction algorithm for multi-slice PET scanners.
复制标题
多层 PET 扫描仪 3D 重建算法的评估。
DOI：
10.1088/0031-9155/37/3/020
复制
发表时间：
1992
影响因子：
3.5
通讯作者：
Hoffman,EJ
中科院分区：
文献类型：
--
作者：
Cherry,SR;Dahlbom,M;Hoffman,EJ
一个完全的3D重建算法的基础上过滤反投影进行了评估重建的数据与多层正电子发射断层扫描（PET）扫描仪已被删除的隔膜。该算法使用前向投影通过数据的2D子集的重建图像来完成3D数据集，从而满足移位不变性的条件。这之后是3D滤波反投影。通过合并相邻极角使轴向采样加倍，从而提高重建的轴向分辨率。该算法进行了测试，使用真实的和模拟的数据集，并给出了高质量的重建，在广泛的成像条件下没有伪影。通过使用MRI/PET配准体模进行测量，将事件准确放置在整个成像体积中。前向投影步骤由于轴向和横轴采样不足而导致图像分辨率降低。如果使用该算法的多次迭代，这种效果会被放大，而图像噪声几乎没有减少。改变在初始2D重建中采用的滤波器可以用于改变3D图像的噪声和分辨率特性。
A fully 3D reconstruction algorithm based on filtered backprojection was evaluated for the reconstruction of data obtained with multi-slice positron emission tomography (PET) scanners which have had the septa removed. This algorithm uses forward-projection through the reconstructed images of a 2D subset of the data to complete the 3D dataset thus satisfying the condition of shift invariance. This is followed by 3D filtered backprojection. Axial sampling was doubled by combining adjacent polar angles, thus improving reconstructed axial resolution. The algorithm was tested using real and simulated datasets and gave high quality reconstructions without artifacts over a wide range of imaging conditions. Events are placed accurately throughout the imaging volume as determined by measurements with a MRI/PET registration phantom. The forward-projection step leads to degradation in image resolution due to insufficient axial and transaxial sampling. This effect is amplified if multiple iterations of the algorithm are used, with little decrease in image noise. Changing the filter employed in the initial 2D reconstruction can be used to alter the noise and resolution characteristics of the 3D images.