Michigan Medicine, Department of Radiology, Division of Cardiothoracic Radiology, Cardiovascular Center, Room 5481, Ann Arbor, MI 48109-5868.
School of Public Health, Ann Arbor, Michigan.
Acad Radiol. 2019 Aug;26(8):1087-1094. doi: 10.1016/j.acra.2018.09.004. Epub 2018 Oct 2.
The journal impact factor (JIF) is often used to assess the prestige of scientific journals. Citations from original articles and reviews as well as citations from noncitable items contribute to the numerator in these calculations. However, since noncitable articles are not included in the denominator, the JIF may be skewed by the types of articles and not accurately reflect the prestige of the journal. The purpose of our study was to develop an alternative and complementary metric by which journals may be assessed. This "adjusted citation rate metric" is based on citations that originate only from citable items in the journal.
We tabulated the number of citations and citable items for original articles from the Web of Science Core Collection for 5 consecutive years (2010-2014) for 20 general radiology journals. The adjusted citation rates (CR) per original article and reviews were calculated using only citations that originated from citable items.
The adjusted CR in 2015 was similar to the JIF in 14 of the 20 journals, higher in four journals, and lower in two journals. Using this system, Radiology, Investigative Radiology, and European Radiology remained first, second, and third respectively among journals published in the field of general radiology. To allow for equal distribution of original articles vs reviews among general radiology journals, we calculated the adjusted CR where the standard distribution of original articles is 50%.
Adjusted citation rate is an objective index for assessing journal impact that can serve as an alternative and complementary metric with which to measure the journal impact.
期刊影响因子（JIF）常用于评估科学期刊的声望。原始文章和综述的引用以及不可引用项目的引用都为这些计算的分子做出了贡献。然而，由于不可引用的文章不包括在分母中，因此 JIF 可能会受到文章类型的影响，而不能准确反映期刊的声望。我们研究的目的是开发一种替代和补充的指标，以评估期刊。这种“调整后的引文率指标”基于期刊中可引用项目的引文。
我们为 20 种普通放射学杂志连续 5 年（2010-2014 年）从 Web of Science 核心集列表中计算了原始文章和综述的引文数量和可引用项目数量。仅使用可引用项目的引文计算了每篇原始文章和综述的调整后引文率（CR）。
在 2015 年，14 种杂志中的 12 种杂志的调整后 CR 与 JIF 相似，4 种杂志的 CR 更高，2 种杂志的 CR 更低。使用该系统，放射学、介入放射学和欧洲放射学杂志在普通放射学领域的期刊中分别保持第一、第二和第三位。为了在普通放射学杂志中平等分配原始文章和综述，我们计算了调整后的 CR，其中原始文章的标准分布为 50%。
调整后的引文率是评估期刊影响的客观指标，可以作为替代和补充指标，用于衡量期刊的影响力。
