Q(t)为组织的TDC，Ca(t)为动脉的TDC，为卷积算子（convolution operator），F为脑血流，FR(t)反映的是一定血流下随时间的变化而残留在脑组织中的对比剂的量，又称为搏动剩余函数（impulse residue functi...
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本文证明了多维卷积算子逼近的逆定理。
This paper investigates the converse theorems for the multidimensional convolution operator approximation.
文中给出了二阶卷积算子的定义和性质并举例说明。
The second order convolution operators are defined and several properties are discussed.
本文建立了具有正核的多维卷积算子逼近的量化定理。
In this paper, the quantitative theorems on the approximation by multidimensional convolution operators are established.
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