Introduction: PACS is a networked group of computers, servers and archives. It manages digital images. RIS manages patient information related to radiology. It supports examination ordering, capturing relevant clinical information, and communicating that information to other systems. The open-source software in the field of radiology informatics has already matured enough to provide many kinds of stable systems. Purpose: The purpose of the master's thesis was implementation of open-source PACS and RIS servers connected with an ultrasound modality, and testing the system's DICOM and HL 7 compliance. Ultrasound system and image viewers are connected to the PACS server. The PACS server takes care of archiving of images. The RIS performs the tasks of patient registration and examination ordering. The whole system supports carrying out ultrasound examinations and communicates according to DICOM and HL 7 standards. Methods: Open-source Dcm4chee PACS archive and Bahmni RIS have been used to implement the system. The ultrasound system and open-source image viewers have been connected to the archive. HL 7 ORM messaging and DICOM MWL and MPPS services played a key role in establishing the communication between individual systems. Results: A user controls the implemented system through the Bahmni RIS. He can register a new patient and order or cancel an examination. He can also look up patient's data and past examinations. The Dcm4chee and Bahmni are integrated. Consequently the user does not know which system manages each process. The RIS conveys the examination data to the Dcm4chee's modality worklist. The ultrasound system is able to retrieve appropriate patients when refreshing its worklist. At the end of the examination, the images are sent to the Dcm4chee archive and the patient is deleted from the worklist. Discussion and conclusion: The implemented system works in accordance with DICOM and HL 7. It supports patient registration, examination ordering, modality worklist, modality performed procedure steps, image archiving, remotely accessing images and writing reports. In the future, it would be beneficial to test this kind of open-source system in a clinical setting to evaluate its behaviour with many users accessing its resources. It would also be necessary to improve the report writing and implement a billing system.