Comparison of projection algorithms used for the construction of maximum intensity projection images.
Comparison of projection algorithms used for the construction of maximum intensity projection images.
复制标题
用于构建最大强度投影图像的投影算法的比较。
DOI：
10.1097/00004728-199601000-00012
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发表时间：
1996
影响因子：
1.3
通讯作者：
Galloway,RL
中科院分区：
文献类型：
--
作者：
Schreiner,S;Paschal,CB;Galloway,RL
材料和方法三种投影方法在用于射线追踪的插值核中不同。插值核包括最近邻插值、线性插值和三次卷积插值。第四种投影方法是体素投影方法，其不是明确的射线跟踪技术。使用计算机生成的血管模型和使用真实的MR血管造影数据来评估这四种算法的性能。评估集中在如何以及一个算法转移到一个对象的宽度的投影planet.ResultsThe体素投影算法不遭受与最近邻算法的工件。此外，利用体素投影方法可以看到投影计算的加速。线性插值显着提高了传输的宽度信息从3D MRA数据集的最近邻和体素投影方法。尽管三次卷积插值内核在理论上上级线性内核，但它并没有比线性插值更准确地投影宽度。最近邻插值的一个可能的优点是，小血管的大小往往会被夸大的投影planet.ConclusionThe结果证实，在其中的MIP图像被构建的方式有显着的影响，在投影中包含的信息。构造方法的选择必须考虑到2D投影中的临床信息通常与原始3D数据体中包含的临床信息不同。
Materials and MethodsThree of the projection methods differ in the interpolation kernel used for ray tracing. The interpolation kernels include nearest neighbor interpolation, linear interpolation, and cubic convolution interpolation. The fourth projection method is a voxel projection method that is not explicitly a ray-tracing technique. The four algorithms' performance was evaluated using a computer-generated model of a vessel and using real MR angiography data. The evaluation centered around how well an algorithm transferred an object's width to the projection plane.ResultsThe voxel projection algorithm does not suffer from artifacts associated with the nearest neighbor algorithm. Also, a speed-up in the calculation of the projection is seen with the voxel projection method. Linear interpolation dramatically improves the transfer of width information from the 3D MRA data set over both nearest neighbor and voxel projection methods. Even though the cubic convolution interpolation kernel is theoretically superior to the linear kernel, it did not project widths more accurately than linear interpolation. A possible advantage to the nearest neighbor interpolation is that the size of small vessels tends to be exaggerated in the projection plane, thereby increasing their visibility.ConclusionThe results confirm that the way in which an MIP image is constructed has a dramatic effect on information contained in the projection. The construction method must be chosen with the knowledge that the clinical information in the 2D projections in general will be different from that contained in the original 3D data volume.