In the 1960’s x-ray mammography was performed with direct exposure film, required high ionizing radiation doses, and produced images of low contrast and poor diagnostic quality (4). General purpose x-ray tubes were used without the compression technique, which is a similar technique to todays common chest x-ray (Joe, 2015). A noteworthy advance in mammography happened when screen-film mammography was introduced in the 1970’s (Faridah, 2008). This made imaging faster, required lower radiation dose, and provided a better contrast (6). Since an effective imaging technique was developed, it became more common for women to get screened. In the 1990’s it was becoming highly regulated since it was seen as a public health threat (6). More standards
