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arXiv 1406.3228math.OCmath.APphysics.med-ph
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耦合Boltzmann迁移方程与放射治疗Optimization的$L^1$ -解的存在性

On Existence of $L^1$-solutions for Coupled Boltzmann Transport Equation and Radiation Therapy Treatment Optimization

Jouko Tervo, Petri Kokkonen

摘要:

本文考虑一个线性系玻尔兹曼输运方程组,模拟光子、电子和正电子三种粒子的演化。由于碰撞项(积分算子),系统是耦合的。该模型特别适用于放射治疗中的剂量计算(正问题)。然而,它并不适用于目前形式的所有相关互动。我们表明,在物理相关的假设下,该系统有一个独特的解决方案在适当的($L^1$为基础的)空间和解决方案是非负的数据(内部源和流入边界源)是非负的。为了在实际中尽可能地自成一体,本文中再现了许多(基本)结果和证明。证明了相关的时变耦合系统解的存在唯一性和非负性。此外,我们处理逆辐射治疗计划问题(逆问题)作为外部和内部治疗(一般$L^p$ -空间)的最优控制问题。特别地,在这种情况下,$p=2$变分方程的最优控制有关的适当的可微凸目标函数进行了验证。它的解可以用作实际(全局)优化的初始点。

英文摘要:

The paper considers a linear system of Boltzmann transport equations modelling the evolution of three species of particles, photons, electrons and positrons. The system is coupled because of the collision term (an integral operator). The model is intended especially for dose calculation (forward problem) in radiation therapy. It, however, does not apply to all relevant interactions in its present form. We show under physically relevant assumptions that the system has a unique solution in appropriate ($L^1$-based) spaces and that the solution is non-negative when the data (internal source and inflow boundary source) is non-negative. In order to be self-contained as much as is practically possible, many (basic) results and proofs have been reproduced in the paper. Existence, uniqueness and non-negativity of solutions for the related time-dependent coupled system are also proven. Moreover, we deal with inverse radiation treatment planning problem (inverse problem) as an optimal control problem both for external and internal therapy (in general $L^p$-spaces). Especially, in the case $p=2$ variational equations for an optimal control related to an appropriate differentiable convex object function are verified. Its solution can be used as an initial point for an actual (global) optimization.

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