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Optimizing the gVERSE RF Pulse Sequence: An Evaluation of Two Competitive Software Algorithms

机译:优化gVERSE RF脉冲序列:两种竞争软件算法的评估

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Radio Frequency (RF) pulses cause elevated patient temperatures during Magnetic Resonance Imaging (MRI) procedures. Generalized Variable Rate Selective Excitation (gVERSE) is a co-design method for Radio Frequency (RF) pulse and slice gradient which minimizes Specific Absorption Rate (SAR) (the accepted predictor of patient heating). After developing a rigorous mathematical model, the nonlinear gVERSE optimization problem is solved using two competitive software packages. The gVERSE solutions generated by Sparse Optimal Control Software (SOCS) and AMPL–MINOS produce two separate variations of SAR reducing pulses. The different software solutions are compared using numerical simulations of slice selection. The computational experiments involved with the gVERSE model provided insight towards using different software to solve highly demanding mathematical optimization problems.
机译:在磁共振成像(MRI)程序中,射频(RF)脉冲会导致患者体温升高。通用可变速率选择性激发(gVERSE)是一种针对射频(RF)脉冲和切片梯度的共同设计方法,可将比吸收率(SAR)(患者加热的公认指标)降至最低。在建立了严格的数学模型后,使用两个竞争软件包解决了非线性gVERSE优化问题。稀疏最优控制软件(SOCS)和AMPL–MINOS生成的gVERSE解决方案产生了两种不同的SAR减小脉冲变体。使用切片选择的数值模拟比较了不同的软件解决方案。 gVERSE模型所涉及的计算实验为使用不同软件解决高要求的数学优化问题提供了见识。

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