This new metric, the green plot ratio (GPR), is based on a common biologicalparameter called the leaf area index (LAI), which is defined as the single-side leaf area per unit ground area.
The extent of water mobility within biological tissues can be quantified by a parameter called the apparent diffusion coefficient (ADC).
水在生物组织内的流动程度，可以由一个被称为表观扩散复合系数（ADC）的参数去量化之。
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METHODS to monitor sterilization effect comprehensively, adopt biological indicator, and chemical indicator to control different parameter and mechanical status during the sterilization.