However, the NLST data can be used to develop mathematical models to determine how long screening should be performed and how often.
Aberle说，“然而，NLST取得的数据可以用于建立数学模型，来确定影像学检查所需的最佳时长和频率。
The NLST was designed to answer specific questions about the screening in older heavy smokers and was conducted at sites with sophisticated medical resources and experts.
NLST是为了回答有关老龄重度吸烟者的影像学检查的特殊问题而设计，并且在拥有丰富的医疗资源和专家的站点中进行。
The NLST is the first trial with sufficient numbers of participants using a randomized design to enable the comparison of mortality differences between spiral CT and chest X-ray, Aberle said.
NLST则是第一次包含大量随机指定的受试者的实验，使得在螺旋CT成像和X射线胸透之间做死亡率的比较成为了可能。
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