The diagnostic imaging area is a support area for areas such as emergencies and hospitalization, that is why the level of service provided by this area is relevant in the day to day of any third level hospital. The main improvement opportunity identified in the provision of these support services is the increased cycle time of the processes. This refers from the generation of the exam order to the delivery of the test results. As a result, there is little efficiency in the provision of services, this is reflected in the total time used for diagnosis and care of patients. The main objective of the project was developing the Lean Healthcare methodology, as a strategy for continuous improvement in the diagnostic imaging area of the Hospital Universitario de La Samaritana (HUS). The groups of services analyzed were CT (Computed tomography) and interventional radiology procedures for emergency patients and hospitalization. The development of this methodology was divided into 6 phases, as follows: i) characterization of the current situation, ii) process value flow mapping, iii) identification of causes of waste, iv) definition of Lean strategies, v) implementation of Short-term strategies and vi) evaluation of the impact of the improvement strategies applied. Among the main results obtained, is the validation of the Lean Healthcare methodology, it allowed to reduce the percentage of time that does not add value to the process, through the reduction of waste such as: movements, waiting times and over-processing.