Pulsatile pressure measurements via harmonics-based orthogonal projection of noisy pressure gradients
Pulsatile pressure measurements via harmonics-based orthogonal projection of noisy pressure gradients
复制标题
通过基于谐波的噪声压力梯度正交投影进行脉动压力测量
DOI：
10.1117/12.657162
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发表时间：
2006
期刊：
影响因子：
3.5
通讯作者：
A. Amini
中科院分区：
文献类型：
--
作者：
Yuehuang Wang;A. Moghaddam;G. Behrens;N. Fatouraee;J. Cebral;E. Choi;A. Amini
在过去，已经开发了几种基于压力-泊松方程迭代解的方法用于从相衬磁共振（PC-MR）数据测量压力。我们已经开发了一种新的非迭代谐波为基础的正交投影方法，可以保持压力测量的基础上的Navier-Stokes方程独立的路径的积分。用一系列正交基函数展开Navier-Stokes方程计算的压力梯度，并将其投影到可积子空间上。然而，在投影步骤之前，设计了一种方案来消除血管边界处的不连续性。该方法被施加到噪声增加的速度从计算流体动力学（CFD）模拟获得的稳定和脉动狭窄的流量，并与压力独立获得的CFD进行比较。此外，在体外模型中测量的稳定流动的MR速度数据具有不同程度的狭窄和不同的流速被用来测试该算法，并将结果与CFD模拟进行比较。
In the past, several methods based on iterative solution of pressure-Poisson equation have been developed for measurement of pressure from phase-contrast magnetic resonance (PC-MR) data. We have developed a novel non-iterative harmonics-based orthogonal projection method which can keep the pressures measured based on the Navier-Stokes equation independent of the path of integration. The gradient of pressure calculated with Navier-Stokes equation is expanded with a series of orthogonal basis functions, and is subsequently projected onto an integrable subspace. Before the projection step however, a scheme is devised to eliminate the discontinuity at the vessel boundaries. The approach was applied to noise-added velocities obtained for both steady and pulsatile stenotic flows from computational fluid dynamics (CFD) simulations and compared with pressures independently obtained by CFD. Additionally, MR velocity data for steady flows measured in in-vitro phantom models with different degree of stenoses and different flow rates were used to test the algorithm and results were compared with CFD simulations.
通过磁共振成像改进主动脉缩窄压力梯度的测量。
影响因子：
24
作者：
Oshinski,JN;Parks,WJ;Markou,CP;Bergman,HL;Larson,BE;Ku,DN;MukundanJr,S;Pettigrew,RI
通讯作者：
Pettigrew,RI
DOI：
--
发表时间：
1994
期刊：
Magnetic resonance quarterly
影响因子：
--
作者：
Pelc,NJ;Sommer,FG;Li,KC;Brosnan,TJ;Herfkens,RJ;Enzmann,DR
通讯作者：
Enzmann,DR