Before revision:  Our goal is to identify primary studies and support the process of choosing and developing DL techniques applied to PCXR images , in addition to pointing out gaps and trends by drawing up a preliminary research agenda. A protocol is described in each phase detailing criteria used from selection to extraction and our set of selected studies is subjected to careful analysis to respond to the research form. Six basic sources were used and the synthesis, results, limitations, and conclusions are exposed .
After revision:  Our goal is to identify primary studies and support the process of choosing and developing DL techniques applied to PCXR images , 2010, to May 20, 2020, and selection criteria utilized on a hundred research papers. As a result, this paper categorizes twenty-six relevant studies and provides a research agenda highlighting limitations, gaps, and trends for further investigations on DL usage in PCXR images. Besides the fact that there is no systematic mapping study on this research topic, to the best of authors' knowledge, this URLanizes the process of finding and selecting relevant studies and data gathering and synthesis in a reproducible way .