photodensitometry

例句：

1. 1. This method is used to measure the light density of different samples.
   这种方法用于测量不同样品的光密度。
2. 2. Photodensitometry is a technique used in medical imaging to analyze tissue structure.
   光密度测定术是一种在医学成像中使用的技术，用于分析组织结构。
3. 3. In photodensitometry, the intensity of light reflected from a sample is measured and compared to a standard to determine its density.
   在光密度测定术中，测量样品反射的光强度并与标准比较，以确定其密度。