Final answer:
The Picture Archiving and Communication System (PACS) is the information system used to display digital radiology images. It offers economical storage, convenient access, and efficient image and data delivery, differentiating itself from RIS, HIS, and EHR systems.
Step-by-step explanation:
The information system used to show digital radiology images is the Picture Archiving and Communication System (PACS). It is a medical imaging technology which provides economical storage and convenient access to images from multiple modalities (source machine types). Electronic images and reports are transmitted digitally via PACS; this eliminates the need to manually file, retrieve, or transport film jackets, which was a significant part of traditional film-based imaging workflows. PACS also has the capacity to deliver timely and efficient access to images, interpretations, and related data. PACS breaks down the physical and time barriers associated with traditional film-based image retrieval, distribution, and display.
In contrast to PACS, the Radiology Information System (RIS) is a networked software system for managing medical imagery and associated data. An RIS is especially useful for tracking radiology imaging orders and billing information, and is often used in conjunction with PACS and Vendor Neutral Archives (VNAs) to manage image archives, record-keeping, and billing.
The Hospital Information System (HIS) is a comprehensive, integrated information system designed to manage all the aspects of a hospital's operation, such as medical, administrative, financial, and legal issues and the corresponding processing of services.
Lastly, an Electronic Health Record (EHR) is a digital version of a patient's paper chart. EHRs are real-time, patient-centered records that make information available instantly and securely to authorized users. An EHR system is designed to contain and share information from all providers involved in a patient's care.